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Regional to global distributions, trends, and drivers of biogenic volatile organic compound emission from 2001 to 2020 Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-18 Hao Wang, Xiaohong Liu, Chenglai Wu, Guangxing Lin
Abstract. Biogenic volatile organic compounds (BVOCs) are important precursors to ozone and secondary organic aerosols in the atmosphere, affecting air quality, clouds, and climate. However, the trend in BVOC emissions and driving factors for the emission changes in different geographic regions over the past 2 decades has remained unclear. Here, regional to global changes in BVOC emissions during 2001–2020
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Extension, development, and evaluation of the representation of the OH-initiated dimethyl sulfide (DMS) oxidation mechanism in the Master Chemical Mechanism (MCM) v3.3.1 framework Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-18 Lorrie Simone Denise Jacob, Chiara Giorio, Alexander Thomas Archibald
Abstract. Understanding dimethyl sulfide (DMS) oxidation can help us constrain its contribution to Earth's radiative balance. Following the discovery of hydroperoxymethyl thioformate (HPMTF) as a DMS oxidation product, a range of new experimental chamber studies have since improved our knowledge of the oxidation mechanism of DMS and delivered detailed chemical mechanisms. However, these mechanisms
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Sea salt reactivity over the northwest Atlantic: an in-depth look using the airborne ACTIVATE dataset Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-18 Eva-Lou Edwards, Yonghoon Choi, Ewan C. Crosbie, Joshua P. DiGangi, Glenn S. Diskin, Claire E. Robinson, Michael A. Shook, Edward L. Winstead, Luke D. Ziemba, Armin Sorooshian
Abstract. Chloride (Cl−) displacement from sea salt particles is an extensively studied phenomenon with implications for human health, visibility, and the global radiation budget. Past works have investigated Cl− depletion over the northwest Atlantic (NWA); however, an updated, multi-seasonal, and geographically expanded account of sea salt reactivity over the region is needed. This study uses chemically
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The impact of dehydration and extremely low HCl values in the Antarctic stratospheric vortex in mid-winter on ozone loss in spring Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-18 Yiran Zhang-Liu, Rolf Müller, Jens-Uwe Grooß, Sabine Robrecht, Bärbel Vogel, Abdul-Mannan Zafar, Ralph Lehmann
Abstract. Simulations of Antarctic chlorine and ozone chemistry show that in the core of the Antarctic vortex (16–18 km, 85–55 hPa, 390–430 K) HCl null cycles (initiated by reactions CH4 + Cl and CH2O + Cl) are effective. These HCl null cycles allow HCl mixing ratios to remain very low throughout Antarctic winter and ozone destroying chlorine (ClOx) to remain enhanced, so that rapid ozone depletion
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Spring tropical cyclones modulate near-surface isotopic compositions of atmospheric water vapour in Kathmandu, Nepal Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-15 Niranjan Adhikari, Jing Gao, Aibin Zhao, Tianli Xu, Manli Chen, Xiaowei Niu, Tandong Yao
Abstract. While westerlies are recognized as a significant moisture transport in Nepal during the pre-monsoon season, precipitation is also attributed to moisture from cyclones originating in the Bay of Bengal (BoB) or the Arabian Sea (AS). Tropical cyclones exhibit negative isotopic values in both precipitation and atmospheric water vapour; however, the factors influencing isotopic fractionation during
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Crucial role of obliquely propagating gravity waves in the quasi-biennial oscillation dynamics Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-15 Young-Ha Kim, Georg Sebastian Voelker, Gergely Bölöni, Günther Zängl, Ulrich Achatz
Abstract. In climate modelling, the reality of simulated flows in the middle atmosphere is largely affected by the model's representation of gravity wave processes that are unresolved, while these processes are usually simplified to facilitate computations. The simplification commonly applied in existing climate models is to neglect wave propagation in horizontal direction and time. Here we
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Measurement report: Atmospheric ice nuclei in the Changbai Mountains (2623 m a.s.l.) in northeastern Asia Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-15 Yue Sun, Yujiao Zhu, Yanbin Qi, Lanxiadi Chen, Jiangshan Mu, Ye Shan, Yu Yang, Yanqiu Nie, Ping Liu, Can Cui, Ji Zhang, Mingxuan Liu, Lingli Zhang, Yufei Wang, Xinfeng Wang, Mingjin Tang, Wenxing Wang, Likun Xue
Abstract. Atmospheric ice nucleation plays an important role in modulating the global hydrological cycle and atmospheric radiation balance. To date, few comprehensive field observations of ice nuclei have been carried out at high-altitude sites, which are close to the height of mixed-phase cloud formation. In this study, we measured the concentration of ice-nucleating particles (INPs) in the immersion
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Oxidative potential apportionment of atmospheric PM1: a new approach combining high-sensitive online analysers for chemical composition and offline OP measurement technique Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-15 Julie Camman, Benjamin Chazeau, Nicolas Marchand, Amandine Durand, Grégory Gille, Ludovic Lanzi, Jean-Luc Jaffrezo, Henri Wortham, Gaëlle Uzu
Abstract. Source apportionment models were widely used to successfully assign highly time-resolved aerosol data to specific emissions and/or atmospheric chemical processes. These techniques are necessary for targeting the sources affecting air quality and for designing effective mitigation strategies. Moreover, evaluation of the toxicity of airborne particulate matter is important since the classically
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Emissions of Methane from Coal, Thermal power plants and Wetlands and its implications on Atmospheric Methane across the South Asian Region Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-15 Mahalakshmi D.Venkata, Mahesh Pathakoti, A. Lakshmi Kanchana, Sujatha Peethani, Ibrahim Shaik, Krishnan Sundara Rajan, Vijay Kumar Sagar, Pushpanathan Raja, Yogesh Kumar Tiwari, Chauhan Prakash
Abstract. Atmospheric methane (CH4) is a potent climate change agent responsible for a fraction of global warming. The present study investigated the spatial and temporal variability of atmospheric column-averaged (X) CH4 (XCH4) concentrations using Greenhouse gases Observing SATellite (GOSAT) and TROPOspheric Monitoring Instrument onboard the Sentienl-5 Precursor (S5P/TROPOMI) data from 2009 to 2022
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Observations of the vertical distributions of summertime atmospheric pollutants in Nam Co: OH production and source analysis Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-15 Chengzhi Xing, Cheng Liu, Chunxiang Ye, Xiangguang Ji, Jingkai Xue, Jinping Ou, Hongyu Wu, Qihou Hu
Abstract. The Tibetan Plateau (TP) plays a key role in regional environment and global climate change, however, the lack of vertical observation hinders a deeper understanding of the atmospheric chemistry and atmospheric oxidation capacity (AOC) on the TP. In this study, we conducted MAX-DOAS measurements at Nam Co, central TP, to observe the vertical profiles of aerosol, water vapor, NO2, HONO and
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Revisiting the evolution of downhill thunderstorms over Beijing: A new perspective from radar wind profiler mesonet Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-15 Xiaoran Guo, Jianping Guo, Tianmeng Chen, Ning Li, Fan Zhang, Yuping Sun
Abstract. Downhill thunderstorms frequently occur in Beijing during the rainy seasons, leading to substantial precipitation. The accurate intensity prediction of these events remains a challenge, partly attributed to insufficient observational studies that unveil the thermodynamic and dynamic structures along the vertical direction. This study provides a comprehensive methodology for identifying both
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Contribution of brown carbon to light absorption in emissions of European residential biomass combustion appliances Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-14 Satish Basnet, Anni Hartikainen, Aki Virkkula, Pasi Yli-Pirilä, Miika Kortelainen, Heikki Suhonen, Laura Kilpeläinen, Mika Ihalainen, Sampsa Väätäinen, Juho Louhisalmi, Markus Somero, Jarkko Tissari, Gert Jakobi, Ralf Zimmermann, Antti Kilpeläinen, Olli Sippula
Abstract. Residential biomass combustion significantly contributes to light-absorbing carbonaceous aerosols in the atmosphere, impacting the earth's radiative balance at regional and global levels. This study investigates the contribution of brown carbon (BrC) to the total particulate light absorption in the wavelength range of 370–950 nm (BrC370–950) and the particulate absorption Ångström exponents
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A machine learning approach to downscale EMEP4UK: analysis of UK ozone variability and trends Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-13 Lily Gouldsbrough, Ryan Hossaini, Emma Eastoe, Paul J. Young, Massimo Vieno
Abstract. High-resolution modelling of surface ozone is an essential step in the quantification of the impacts on health and ecosystems from historic and future concentrations. It also provides a principled way in which to extend analysis beyond measurement locations. Often, such modelling uses relatively coarse-resolution chemistry transport models (CTMs), which exhibit biases when compared to measurements
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Impacts of ice-nucleating particles on cirrus clouds and radiation derived from global model simulations with MADE3 in EMAC Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-14 Christof G. Beer, Johannes Hendricks, Mattia Righi
Abstract. Atmospheric aerosols can act as ice-nucleating particles (INPs) and influence the formation and the microphysical properties of cirrus clouds, resulting in distinct climate effects. We employ a global aerosol–climate model, including a two-moment cloud microphysical scheme and a parameterization for aerosol-induced ice formation in cirrus clouds, to quantify the climate impact of INPs on
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Decadal trends in observed surface solar radiation and their causes in Brazil in the first two decades of the 21st century Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-14 Lucas Ferreira Correa, Doris Folini, Boriana Chtirkova, Martin Wild
Abstract. Numerous studies have investigated the long term variability of surface solar radiation (SSR) around the world. However, the large disparity in the availability of observational data between developed and least developed/developing countries leads to an underrepresentation of studies on SSR changes in the latter. This is especially true for South America, where few observational studies have
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A statistical analysis of the occurrence of polar stratospheric ice clouds based on MIPAS satellite observations and the ERA5 reanalysis Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-14 Ling Zou, Reinhold Spang, Sabine Griessbach, Lars Hoffmann, Farahnaz Khosrawi, Rolf Müller, Ines Tritscher
Abstract. Small-scale temperature fluctuations can play a crucial role in the occurrence of ice clouds. This study analyzes a decade of ice polar stratospheric clouds (PSCs) occurrence obtained from Michelson Interferometer for Passive Atmospheric Sounding (MIPAS/Envisat) measurements. The points with the smallest temperature difference (ΔTice_min) between the frost point temperature (Tice) and the
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On the calculation of single-scattering properties of frozen droplets and frozen droplet aggregates observed in deep convective clouds Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-14 Jeonggyu Kim, Sungmin Park, Greg Michael McFarquhar, Anthony J. Baran, Joo Wan Cha, Kyoungmi Lee, Seoung Soo Lee, Chang Hoon Jung, Kyo-Sun Sunny Lim, Junshik Um
Abstract. During multiple field campaigns, small quasi-spherical ice crystals, commonly referred to as frozen droplets (FDs), and their aggregates (frozen droplet aggregates (FDAs)), have been identified as the predominant habits in the upper regions of deep convective clouds (DCCs) and their associated anvils. These findings highlight the significance of FDs and FDAs for understanding the microphysics
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Improving Ground-Level NO2 Estimation in China Using GEMS Measurements and a Nested Machine Learning Model Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-13 Naveed Ahmad, Changqing Lin, Alexis K. H. Lau, Jhoon Kim, Fangqun Yu, Chengcai Li, Ying Li, Jimmy C. H. Fung, Xiang Qian Lao
Abstract. The major bridge linking satellite-derived vertical column densities (VCDs) of nitrogen dioxide (NO2) with ground-level concentration is theoretically the NO2 mixing height (NMH). Various meteorological parameters have been used as a proxy of NMH in existing studies. This study developed a nested machine learning model to convert VCDs of NO2 into ground-level NO2 concentrations across China
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Development of a detailed gaseous oxidation scheme of naphthalene for SOA formation and speciation Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-13 Victor Lannuque, Karine Sartelet
Abstract. Naphthalene is the most abundant polycyclic aromatic hydrocarbon (PAH) in vehicle emissions and polluted urban areas. Its atmospheric oxidation products oxygenated compounds potentially harmful for health and/or contributing to secondary organic aerosol (SOA) formation. Despite its impact on air quality, its complex structure and lack of data mean that no detailed scheme of naphthalene gaseous
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Can we gain knowledge on COS anthropogenic and biogenic emissions from a single atmospheric mixing ratios measurement site? Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-12 Antoine Berchet, Isabelle Pison, Camille Huselstein, Clément Narbaud, Marine Remaud, Sauveur Belviso, Camille Abadie, Fabienne Maignan
Abstract. Lack of knowledge still remains on many processes leading to COS atmospheric fluxes, either natural such as the oceanic emissions or the vegetation and soil fluxes, or anthropogenic, from industrial activities and power generation. Moreover, COS atmospheric mixing ratio data are still too sparse to evaluate the estimations of these sources and sinks. This study assesses the anthropogenic and
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Seasonal characteristics of emission, distribution, and radiative effect of marine organic aerosols over the western Pacific Ocean: an investigation with a coupled regional climate aerosol model Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-13 Jiawei Li, Zhiwei Han, Pingqing Fu, Xiaohong Yao, Mingjie Liang
Abstract. Organic aerosols from marine sources over the western Pacific Ocean of East Asia were investigated using an online coupled regional chemistry–climate model RIEMS-Chem for the entire year 2014. Model evaluation against a wide variety of observations from research cruises and in situ measurements demonstrated a good skill of the model in simulating temporal variation and spatial distribution
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Influence of cloud retrieval errors due to three-dimensional radiative effects on calculations of broadband shortwave cloud radiative effect Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-12 Adeleke S. Ademakinwa, Zahid H. Tushar, Jianyu Zheng, Chenxi Wang, Sanjay Purushotham, Jianwu Wang, Kerry G. Meyer, Tamas Várnai, Zhibo Zhang
Abstract. We investigate how cloud retrieval errors due to the three-dimensional (3D) radiative effects affect broadband shortwave (SW) cloud radiative effects (CREs) in shallow cumulus clouds. A framework based on the combination of large eddy simulations (LESs) and radiative transfer (RT) models was developed to simulate both one-dimensional (1D) and 3D radiance, as well as SW broadband fluxes. Results
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Fire–precipitation interactions amplify the quasi-biennial variability in fires over southern Mexico and Central America Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-12 Yawen Liu, Yun Qian, Philip J. Rasch, Kai Zhang, Lai-yung Ruby Leung, Yuhang Wang, Minghuai Wang, Hailong Wang, Xin Huang, Xiu-Qun Yang
Abstract. Fires have great ecological, social, and economic impact. However, fire prediction and management remain challenges due to a limited understanding of their roles in the Earth system. Fires over southern Mexico and Central America (SMCA) are a good example of this, greatly impacting local air quality and regional climate. Here we report that the spring peak (April–May) of fire activities in
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WRF-SBM Numerical Simulation of Aerosol Effects on Stratiform Warm Clouds in Jiangxi, China Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-12 Yi Li, Xiaoli Liu, Hengjia Cai
Abstract. Aerosols, as cloud condensation nuclei (CCN), impact cloud droplet spectrum and dispersion (ε), affecting precipitation and climate change. However, the influence of various aerosol modes on cloud physics remains controversial, and this effect varies with location and cloud type. This study uses a bin microphysics scheme (WRF-SBM) to simulate a warm stratiform cloud in Jiangxi, China. The
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Observed and CMIP6 model simulated organic aerosol response to drought in the contiguous United States during summertime Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-12 Wei Li, Yuxuan Wang
Abstract. Drought events have been linked with the enhancements of organic aerosols (OA), but the mechanisms have not been comprehensively understood. This study investigates the relationships between the monthly standardized precipitation–evapotranspiration index (SPEI) and surface OA in the contiguous United States (CONUS) during the summertime from 1998 to 2019. OA under severe drought conditions
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Verifying national inventory-based combustion emissions of CO2 across the UK and mainland Europe using satellite observations of atmospheric CO and CO2 Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-12 Tia Scarpelli, Paul Palmer, Mark Lunt, Ingrid Super, Arjan Droste
Abstract. Under the Paris Agreement, countries report their anthropogenic greenhouse gas emissions in national inventories, used to track progress towards mitigation goals, but they must be independently verified. Atmospheric observations of CO2, interpreted using inverse methods, can potentially provide that verification. Conventional CO2 inverse methods infer natural CO2 fluxes by subtracting a priori
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Regional and sectoral contributions of NOx and reactive carbon emission sources to global trends in tropospheric ozone during the 2000–2018 period Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-12 Aditya Nalam, Aura Lupascu, Tabish Ansari, Timothy Butler
Abstract. Over the past few decades, the tropospheric ozone precursor anthropogenic emissions: nitrogen oxides (NOx) and reactive carbon (RC) from mid-latitude regions have been decreasing, and those from Asia and tropical regions have been increasing, leading to an equatorward emission redistribution. In this study, we quantify the contributions of various sources of NOx and RC emissions to tropospheric
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On the atmospheric budget of ethylene dichloride and its impact on stratospheric chlorine and ozone (2002–2020) Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-12 Ryan Hossaini, David Sherry, Zihao Wang, Martyn Chipperfield, Wuhu Feng, David Oram, Karina Adcock, Stephen Montzka, Isobel Simpson, Andrea Mazzeo, Amber Leeson, Elliot Atlas, Charles C.-K. Chou
Abstract. Ethylene dichloride (EDC), or 1-2-dichloroethane, is an industrial very short-lived substance (VSLS) whose major use is as a feedstock in the production chain of polyvinyl chloride (PVC). Like other chlorinated VSLS, transport of EDC (or its atmospheric oxidation products) to the stratosphere could contribute to ozone depletion there. However, despite annual production volumes greatly exceeding
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Technical note: Influence of different averaging metrics and temporal resolutions on aerosol pH calculated by thermodynamic modeling Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-12 Haoqi Wang, Xiao Tian, Wanting Zhao, Jiacheng Li, Haoyu Yu, Yinchang Feng, Shaojie Song
Abstract. Aerosol pH is commonly used to characterize the acidity of aqueous aerosols and is of significant scientific interest due to its close relationship with atmospheric processes. Estimation of ambient aerosol pH usually relies on the thermodynamic modeling approach. In the existing chemical transport model and field observation studies, the temporal resolution of the input chemical and meteorological
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Morphological and optical properties of carbonaceous aerosol particles from ship emissions and biomass burning during a summer cruise measurement in the South China Sea Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-11 Cuizhi Sun, Yongyun Zhang, Baoling Liang, Min Gao, Xi Sun, Fei Li, Xue Ni, Qibin Sun, Hengjia Ou, Dexian Chen, Shengzhen Zhou, Jun Zhao
Abstract. Carbonaceous aerosols constitute a crucial component of atmospheric marine aerosols among which black carbon (BC) and brown carbon (BrC) are important contributors to light absorption and hence the positive climatic radiative forcing in the marine atmosphere. We conducted month-long (5 May–9 June 2021) onboard sample collections and online measurements of carbonaceous aerosols to characterize
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Aqueous-phase chemistry of glyoxal with multifunctional reduced nitrogen compounds: a potential missing route for secondary brown carbon Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-11 Yuemeng Ji, Zhang Shi, Wenjian Li, Jiaxin Wang, Qiuju Shi, Yixin Li, Lei Gao, Ruize Ma, Weijun Lu, Lulu Xu, Yanpeng Gao, Guiying Li, Taicheng An
Abstract. The aqueous-phase chemistry of glyoxal (GL) with reduced nitrogen compounds (RNCs) is a significant source for secondary brown carbon (SBrC), which is one of the largest uncertainties in climate predictions. However, a few studies have revealed that SBrC formation is affected by multifunctional RNCs, which have a non-negligible atmospheric abundance. Hence, we assessed theoretical and experimental
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An observation-constrained estimation of brown carbon aerosol direct radiative effects Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-11 Yueyue Cheng, Chao Liu, Jiandong Wang, Jiaping Wang, Zhouyang Zhang, Li Chen, Dafeng Ge, Caijun Zhu, Jinbo Wang, Aijun Ding
Abstract. Brown carbon (BrC) is an organic carbon component with noticeable absorption in the ultraviolet and short visible wavelengths, which influences the global radiative balance. However, assessing BrC radiative effects remains a challenging task owing to the scarcity of direct BrC observations and the uncertainties regarding their chemical and optical properties. This study proposes an efficient
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Tropical upper tropospheric trends in ozone and carbon monoxide (2005–2020): observational and model results Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-11 Lucien Froidevaux, Douglas E. Kinnison, Benjamin Gaubert, Michael J. Schwartz, Nathaniel J. Livesey, William G. Read, Charles G. Bardeen, Jerry R. Ziemke, Ryan A. Fuller
Abstract. We analyze tropical ozone (O3) and carbon monoxide (CO) distributions in the upper troposphere (UT) and their temporal changes for 2005–2020 using Aura Microwave Limb Sounder (MLS) observations and chemistry climate models. The models are the Whole Atmosphere Community Climate Model (WACCM6) and two variants of the Community Atmosphere Model with Chemistry (CAM-chem), each variant using different
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Effect of Secondary Ice Production Processes on the Simulation of ice pellets using the Predicted Particle Properties microphysics scheme Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-08 Mathieu Lachapelle, Mélissa Cholette, Julie M. Thériault
Abstract. Ice pellets can form when supercooled raindrops collide with small ice particles that can be generated through secondary ice production processes. The use of atmospheric models that neglect these collisions can lead to an overestimation of freezing rain. The objective of this study is therefore to understand the impacts of collisional freezing and secondary ice production on simulations of
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Individual coal mine methane emissions constrained by eddy covariance measurements: low bias and missing sources Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-08 Kai Qin, Wei Hu, Qin He, Fan Lu, Jason Blake Cohen
Abstract. China's Shanxi Province accounts for 12 % of global coal output and therefore is responsible for a very large fraction of the total global methane (CH4) emissions, as well as being a large source of uncertainty due to the lack of in situ and field measurements. This work introduces the first comprehensive attempt to compute the coal mine methane (CMM) emissions throughout Shanxi, using a
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Interaction between marine and terrestrial biogenic volatile organic compounds: Non-linear effect on secondary organic aerosol formation Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-06 Xiaowen Chen, Lin Du, Zhaomin Yang, Shan Zhang, Narcisse Tsona Tchinda, Jianlong Li, Kun Li
Abstract. Biogenic volatile organic compounds (BVOCs) are the largest source of secondary organic aerosols (SOA) globally. However, the complex interactions between marine and terrestrial BVOCs remain unclear, inhibiting our in-depth understanding of the SOA formation in the coastal areas and its environmental impacts. Here, we performed smog chamber experiments with mixed α-pinene (a typical monoterpene)
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Spatial disparities of ozone pollution in the Sichuan Basin spurred by extreme, hot weather Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-08 Nan Wang, Yunsong Du, Dongyang Chen, Haiyan Meng, Xi Chen, Li Zhou, Guangming Shi, Yu Zhan, Miao Feng, Wei Li, Mulan Chen, Zhenliang Li, Fumo Yang
Abstract. Under the influence of climate change, the increasing occurrence of extreme weather events, such as heatwaves, has led to an enhanced frequency of ozone (O3) pollution issues. In August 2022, the Sichuan Basin (SCB), a typical large-scale geographical terrain located in southwestern China, experienced the most severe heatwave in the last 20 years. The heatwave led to substantial disparities
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The variations of VOCs based on the policy change of Omicron in polluted winter in traffic-hub city, China Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-08 Bowen Zhang, Dong Zhang, Zhe Dong, Xinshuai Song, Ruiqin Zhang, Xiao Li
Abstract. Online volatile organic compounds (VOCs) were continuous monitored before and after the Omicron policy change at an urban site in polluted Zhengzhou from December 1, 2022, to January 31, 2023. The characteristics and sources of VOCs were explored. The daily average concentration of PM2.5 and total VOCs (TVOCs) ranged from 54 to 239 µg/m3 and from 15.6 to 57.1 ppbv with an average value of
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Ozone anomalies over polar regions during the stratospheric warming events Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-08 Guochun Shi, Witali Krochin, Eric Sauvageat, Gunter Stober
Abstract. The impact of major sudden stratospheric warming (SSW) events and early final stratospheric warming (FSW) events on ozone variations in the middle atmosphere in the Arctic is investigated by performing microwave radiometer measurements above Ny-Ålesund, Svalbard (79° N, 12° E) with GROMOS-C. The retrieved daily ozone profiles during SSW and FSW events in the stratosphere and lower mesosphere
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A comprehensive insight into trajectory climatology and spatiotemporal distribution of dust aerosols in China Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-08 Lu Yang, Lu She, Yahui Che, Jiayu Zhang, Zixian Feng, Chen Yan
Abstract. Airborne dust aerosols impact negatively the climate, ecosystems, air quality, and human health. To mitigate these impacts, it is crucial to identify their three–dimensional spatiotemporal distribution, transport pathways and driving factors. In this study, the three–dimensional spatiotemporal variations and distribution of dust aerosols in China from 2007 to 2021 were first analyzed using
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Downward Coupling of Sudden Stratospheric Warmings: Important Role of Synoptic-Scale Waves Demonstrated by ERA5 Reanalysis Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-07 Tabea Rahm, Robin Pilch Kedzierski, Martje Hänsch, Katja Matthes
Abstract. Circulation anomalies accompanying Sudden Stratospheric Warmings (SSWs) can have a significant impact on the troposphere. This surface response is observed for some but not all SSWs, and their downward coupling is not fully understood. We use an existing classification method to separate downward- and non-propagating SSWs (d/nSSWs) in ERA5 reanalysis data for the years 1979–2019. The differences
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Quantifying the diurnal variation of atmospheric NO2 from observations of the Geostationary Environment Monitoring Spectrometer (GEMS) Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-07 David P. Edwards, Sara Martínez-Alonso, Duseong S. Jo, Ivan Ortega, Louisa K. Emmons, John J. Orlando, Helen M. Worden, Jhoon Kim, Hanlim Lee, Junsung Park, Hyunkee Hong
Abstract. The Geostationary Environment Monitoring Spectrometer (GEMS) over Asia is the first geostationary Earth orbit instrument in the virtual constellation of sensors for atmospheric chemistry and composition air quality research and applications. For the first time, the hourly observations enable studies of diurnal variation of several important trace gas and aerosol pollutants including nitrogen
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Critical contribution of chemically diverse carbonyl molecules to the oxidative potential of atmospheric aerosols Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-06 Feifei Li, Shanshan Tang, Jitao Lv, Shiyang Yu, Xu Sun, Dong Cao, Yawei Wang, Guibin Jiang
Abstract. Carbonyls have an important effect on atmospheric chemistry and human health because of their high electrophilicity. Here, high-throughput screening of carbonyl molecules in complex aerosol samples was achieved by combining targeted derivatization with non-targeted analysis using Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). Results showed that water-soluble organic
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Improved estimates of smoke exposure during Australia fire seasons: importance of quantifying plume injection heights Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-07 Xu Feng, Loretta J. Mickley, Michelle L. Bell, Tianjia Liu, Jenny A. Fisher, Maria Val Martin
Abstract. Wildfires can have a significant impact on air quality in Australia during severe burning seasons, but incomplete knowledge of the injection heights of smoke plumes poses a challenge for quantifying smoke exposure. In this study, we use two approaches to quantify the fractions of fire emissions injected above the planetary boundary layer (PBL), and we further investigate the impact of plume
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Measurement report: Water diffusion in single suspended phase-separated aerosols Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-07 Yu-Kai Tong, Zhijun Wu, Min Hu, Anpei Ye
Abstract. Water diffusion is a typical thermodynamic process in ambient aerosols that plays pivotal roles in their physicochemical properties and atmospheric lifetime and influences the climate and human health. A fair amount of aerosols become phase-separated after experiencing atmospheric aging processes such as efflorescence, amorphization, and liquid–liquid phase separation. However, detecting
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Water activity and surface tension of aqueous ammonium sulfate and D-glucose aerosol nanoparticles Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-07 Eugene F. Mikhailov, Sergey S. Vlasenko, Alexei A. Kiselev
Abstract. Water activity (aw) and interfacial energy or surface tension (σ) are key thermodynamic parameters to describe the hygroscopic growth of atmospheric aerosol particles and their ability to serve as cloud condensation nuclei (CCN), thus influencing the hydrological cycle and climate. Due to size effects and complex mixing states, however, these parameters are not well constrained for nanoparticles
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Six years of continuous carbon isotope composition measurements of methane in Heidelberg (Germany) – a study of source contributions and comparison to emission inventories Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-07 Antje Hoheisel, Martina Schmidt
Abstract. Mitigation of greenhouse gases requires a precise knowledge of their sources at both global and regional scales. With improving measurement techniques, in situ δ(13C,CH4) records are analysed in a growing number of studies to characterise methane emissions and to evaluate inventories at regional and local scales. However, most of these studies cover short time periods of a few months, and
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Air quality model assessment in city plumes of Europe and East Asia Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-07 Adrien Deroubaix, Marco Vountas, Benjamin Gaubert, Maria Dolores Andrés Hernández, Stephan Borrmann, Guy Brasseur, Bruna Holanda, Yugo Kanaya, Katharina Kaiser, Flora Kluge, Ovid Oktavian Krüger, Inga Labuhn, Michael Lichtenstern, Klaus Pfeilsticker, Mira Pöhlker, Hans Schlager, Johannes Schneider, Guillaume Siour, Basudev Swain, Paolo Tuccella, Kameswara S. Vinjamuri, Mihalis Vrekoussis, Benjamin
Abstract. An air quality model ensemble is used to represent the current state-of-the-art in atmospheric modeling, composed of two global forecasts and two regional simulations. The model ensemble assessment focuses on both carbonaceous aerosols, i.e. black carbon (BC) and organic aerosol (OA), and five trace gases during two aircraft campaigns of the EMeRGe (Effect of Megacities on the Transport and
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Real-world emission characteristics of VOCs from typical cargo ships and their potential contributions to SOA and O3 under low-sulfur fuel policies Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-07 Fan Zhang, Binyu Xiao, Zeyu Liu, Yan Zhang, Chongguo Tian, Rui Li, Can Wu, Yali Lei, Si Zhang, Xinyi Wan, Yubao Chen, Yong Han, Min Cui, Cheng Huang, Hongli Wang, Yingjun Chen, Gehui Wang
Abstract. Mandatory use of low-sulfur fuel according to global sulfur limit regulation has reduced the emissions of SO2 and PM significantly on ships, while it also leads to very large uncertainty on VOCs emission. Therefore, on-board test of VOCs from 9 typical cargo ships with low-sulfur fuels in China were carried out in this study. Results showed that emission factor of VOCs (EFVOCs) varied largely
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Mechanistic insight into the kinetic fragmentation of Norpinonic Acid in the gas phase: An experimental and DFT study Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-07 Izabela Kurzydym, Agata Błaziak, Kinga Podgórniak, Karol Kułacz, Kacper Błaziak
Abstract. Norpinonic acid has been known as an important α-pinene athmospheric SOA (Secondary Organic Aerosol) component. It is formed in the reaction of α-pinene, β-pinene or verbenone with atmospheric oxidizing reagents, such as ozone (O3) and hydroxy radicals. In the presented studies, tandem mass spectrometry techniques were used to determine the exact norpinonic acid fragmentation pathway in the
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Daytime variation in the aerosol indirect effect for warm marine boundary layer clouds in the eastern North Atlantic Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-06 Shaoyue Qiu, Xue Zheng, David Painemal, Christopher R. Terai, Xiaoli Zhou
Abstract. Warm boundary layer clouds in the eastern North Atlantic region exhibit significant diurnal variations in cloud properties. However, the diurnal cycle of the aerosol indirect effect (AIE) for these clouds remains poorly understood. This study takes advantage of recent advancements in the spatial resolution of geostationary satellites to explore the daytime variation in the AIE by estimating
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Roles of oceanic ventilation and terrestrial outflow in the atmospheric non-methane hydrocarbons over the Chinese marginal seas Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-06 Jian Wang, Lei Xue, Qianyao Ma, Feng Xu, Gaobin Xu, Shibo Yan, Jiawei Zhang, Jianlong Li, Honghai Zhang, Guiling Zhang, Zhaohui Chen
Abstract. Non-methane hydrocarbons (NMHCs) in the marine atmosphere have been extensively studied due to their important roles in regulating the atmospheric chemistry and climate. However, very little is known about the distribution and sources of NMHCs in the lower atmosphere over the marginal seas of China. Herein, we characterized the atmospheric NMHCs (C2-C5) in both the coastal cities and marginal
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Global estimates of reactive nitrogen components during 2000–2100 based on the multi-stage model Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-05 Rui Li, Yining Gao, Lijia Zhang, Yubing Shen, Gehui Wang
Abstract. High contents of reactive nitrogen components aggravate air pollution and could also impact ecosystem structure and function across the terrestrial-aquatic-marine continuum. However, the long-term historical trends and future prediction of reactive nitrogen components at the global scale still remains high uncertainties. In our study, the field observations, satellite products, model output
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A remote sensing algorithm for vertically resolved cloud condensation nuclei number concentrations from airborne and spaceborne lidar observations Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-05 Piyushkumar N. Patel, Jonathan H. Jiang, Ritesh Gautam, Harish Gadhavi, Olga Kalashnikova, Michael J. Garay, Lan Gao, Feng Xu, Ali Omar
Abstract. Cloud condensation nuclei (CCN) are mediators of aerosol–cloud interactions (ACIs), contributing to the largest uncertainties in the understandings of global climate change. We present a novel remote-sensing-based algorithm that quantifies the vertically resolved CCN number concentrations (NCCN) using aerosol optical properties measured by a multiwavelength lidar. The algorithm considers
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Tropical tropospheric aerosol sources and chemical composition observed at high altitude in the Bolivian Andes Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-05 C. Isabel Moreno, Radovan Krejci, Jean-Luc Jaffrezo, Gaëlle Uzu, Andrés Alastuey, Marcos F. Andrade, Valeria Mardóñez, Alkuin Maximilian Koenig, Diego Aliaga, Claudia Mohr, Laura Ticona, Fernando Velarde, Luis Blacutt, Ricardo Forno, David N. Whiteman, Alfred Wiedensohler, Patrick Ginot, Paolo Laj
Abstract. The chemical composition of PM10 and non-overlapping PM2.5 was studied at the summit of Mt. Chacaltaya (5380 m a.s.l., lat. −16.346950°, long. −68.128250°) providing a unique long-term record spanning from December 2011 to March 2020. The chemical composition of aerosol at the Chacaltaya Global Atmosphere Watch (GAW) site is representative of the regional background, seasonally affected by
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On the potential use of highly oxygenated organic molecules (HOMs) as indicators for ozone formation sensitivity Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-05 Jiangyi Zhang, Jian Zhao, Yuanyuan Luo, Valter Mickwitz, Douglas Worsnop, Mikael Ehn
Abstract. Ozone (O3), an important and ubiquitous trace gas, protects lives from harmful solar ultraviolet (UV) radiation in the stratosphere but is toxic to living organisms in the troposphere. Additionally, tropospheric O3 is a key oxidant and a source of other oxidants (e.g., OH and NO3 radicals) for various volatile organic compounds (VOCs). Recently, highly oxygenated organic molecules (HOMs)
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Technical Note: Nighttime OH and HO2 chemical equilibria in the mesosphere – lower thermosphere Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-05 Mikhail Yu. Kulikov, Mikhail V. Belikovich, Alexey G. Chubarov, Svetlana O. Dementyeva, Alexander M. Feigin
Abstract. At the altitudes of the mesosphere – lower thermosphere, OH and HO2 play a significant role in many physicochemical processes. Thus, monitoring of their spatiotemporal evolution together with other chemically active trace gases is one of the most important problems for this atmosphere region, in which direct measurements are difficult. The paper studies the nighttime OH and HO2 chemical equilibria
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Unique structure, radiative effects and precipitation characteristics of deep convection systems in the Tibetan Plateau compared to tropical oceans Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-04 Yuxin Zhao, Jiming Li, Deyu Wen, Yarong Li, Yuan Wang, Jianping Huang
Abstract. Using the space-borne lidar/radar observations, this study identifies deep convection systems (DCS), including deep convection core (DCC) and anvils, over Tibetan Plateau (TP) and tropical oceans (TO), and finds that DCSs over TP are less frequent, exhibiting narrower and thinner DCCs and anvils compared to those over TO. The thinner DCCs over TP exert weaker radiative cooling effects at
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Chemical composition, sources and formation mechanism of urban PM2.5 in Southwest China: a case study at the beginning of 2023 Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-04 Junke Zhang, Yunfei Su, Chunying Chen, Wenkai Guo, Qinwen Tan, Miao Feng, Danlin Song, Tao Jiang, Qiang Chen, Yuan Li, Wei Li, Yizhi Wang, Xiaojuan Huang, Lin Han, Wanqing Wu, Gehui Wang
Abstract. Despite significant improvements in air quality in recent years, the Sichuan Basin (SCB) is still facing frequent haze pollution in winter, and the causes of severe haze formation have not yet been fully investigated. In this study, the chemical components of PM2.5 (i.e., particulate matter with an aerodynamic diameter of less than 2.5 µm) in a typical pollution period at the beginning of
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Chemical characterization of atmospheric aerosols at a high-altitude mountain site: a study of source apportionment Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-03-04 Elena Barbaro, Matteo Feltracco, Fabrizio De Blasi, Clara Turetta, Marta Radaelli, Warren Cairns, Giulio Cozzi, Giovanna Mazzi, Marco Casula, Jacopo Gabrieli, Carlo Barbante, Andrea Gambaro
Abstract. The study of aerosols in high mountain regions is essential because particulate matter can play a role in altering the energy balance of high mountain regions, and aerosols can accelerate glacier melting in high mountain areas by darkening the ice surface, reducing its reflectivity (albedo). Studying aerosols in high mountain areas provides insights into long-range transport of pollutants