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Moisture and temperature effects on the radiocarbon signature of respired carbon dioxide to assess stability of soil carbon in the Tibetan Plateau Biogeosciences (IF 4.9) Pub Date : 2024-03-18 Andrés Tangarife-Escobar, Georg Guggenberger, Xiaojuan Feng, Guohua Dai, Carolina Urbina-Malo, Mina Azizi-Rad, Carlos A. Sierra
Abstract. Microbial release of CO2 from soils to the atmosphere reflects how environmental conditions affect the stability of soil organic matter (SOM), especially in massive organic-rich ecosystems like the peatlands and grasslands of the Qinghai–Tibetan Plateau (QTP). Radiocarbon (14C) is an important tracer of the global carbon cycle and can be used to understand SOM dynamics through the estimation
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Variability and drivers of carbonate chemistry at shellfish aquaculture sites in the Salish Sea, British Columbia Biogeosciences (IF 4.9) Pub Date : 2024-03-18 Eleanor Simpson, Debby Ianson, Karen E. Kohfeld, Ana C. Franco, Paul A. Covert, Marty Davelaar, Yves Perreault
Abstract. Ocean acidification (OA) reduces seawater pH and calcium carbonate saturation states (Ω), which can have detrimental effects on calcifying organisms such as shellfish. Nearshore areas, where shellfish aquaculture typically operates, have limited data available to characterize variability in key ocean acidification parameters pH and Ω, as samples are costly to analyze and difficult to collect
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Resolving heterogeneous fluxes from tundra halves the growing season carbon budget Biogeosciences (IF 4.9) Pub Date : 2024-03-18 Sarah M. Ludwig, Luke Schiferl, Jacqueline Hung, Susan M. Natali, Roisin Commane
Abstract. Landscapes are often assumed to be homogeneous when interpreting eddy covariance fluxes, which can lead to biases when gap-filling and scaling up observations to determine regional carbon budgets. Tundra ecosystems are heterogeneous at multiple scales. Plant functional types, soil moisture, thaw depth, and microtopography, for example, vary across the landscape and influence net ecosystem
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Frost matters: incorporating late-spring frost into a dynamic vegetation model regulates regional productivity dynamics in European beech forests Biogeosciences (IF 4.9) Pub Date : 2024-03-18 Benjamin F. Meyer, Allan Buras, Konstantin Gregor, Lucia S. Layritz, Adriana Principe, Jürgen Kreyling, Anja Rammig, Christian S. Zang
Abstract. Late-spring frost (LSF) is a critical factor influencing the functioning of temperate forest ecosystems. Frost damage in the form of canopy defoliation impedes the ability of trees to effectively photosynthesize, thereby reducing tree productivity. In recent decades, LSF frequency has increased across Europe, likely intensified by the effects of climate change. With increasing warming, many
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Comparison of carbon and water fluxes and the drivers of ecosystem water use efficiency in a temperate rainforest and a peatland in southern South America Biogeosciences (IF 4.9) Pub Date : 2024-03-18 Jorge F. Perez-Quezada, David Trejo, Javier Lopatin, David Aguilera, Bruce Osborne, Mauricio Galleguillos, Luca Zattera, Juan L. Celis-Diez, Juan J. Armesto
Abstract. The variability and drivers of carbon and water fluxes and their relationship to ecosystem water use efficiency (WUE) in natural ecosystems of southern South America are still poorly understood. For 8 years (2015–2022), we measured carbon dioxide net ecosystem exchange (NEE) and evapotranspiration (ET) using eddy covariance towers in a temperate rainforest and a peatland in southern Chile
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Drivers of decadal trends of the ocean carbon sink in the past, present, and future in Earth system models Biogeosciences (IF 4.9) Pub Date : 2024-03-18 Jens Terhaar
Abstract. The land biosphere and the ocean are the two major sinks of anthropogenic carbon at present. When anthropogenic carbon emissions become zero and temperatures stabilizes, the ocean is projected to become the dominant and only global natural sink of carbon. Despite the ocean’s importance for the carbon cycle and hence the climate, observing the ocean carbon sink and detecting anthropogenic
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Data-based investigation of the effects of canopy structure and shadows on chlorophyll fluorescence in a deciduous oak forest Biogeosciences (IF 4.9) Pub Date : 2024-03-15 Hamadou Balde, Gabriel Hmimina, Yves Goulas, Gwendal Latouche, Abderrahmane Ounis, Kamel Soudani
Abstract. Data from satellite, aircraft, drone, and ground-based measurements have already shown that canopy-scale sun-induced chlorophyll fluorescence (SIF) is tightly related to photosynthesis, which is linked to vegetation carbon assimilation. However, our ability to effectively use those findings are hindered by confounding factors, including canopy structure, fluctuations in solar radiation, and
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Ocean liming effects on dissolved organic matter dynamics Biogeosciences (IF 4.9) Pub Date : 2024-03-14 Chiara Santinelli, Silvia Valsecchi, Simona Retelletti Brogi, Giancarlo Bachi, Giovanni Checcucci, Mirco Guerrazzi, Elisa Camatti, Stefano Caserini, Arianna Azzellino, Daniela Basso
Abstract. Ocean liming has gained attention as a potential solution to mitigate climate change by actively removing carbon dioxide (CO2) from the atmosphere. The addition of hydrated lime (Ca(OH)2) into oceanic surface water leads to an increase in alkalinity, which in turn promotes the uptake and sequestration of atmospheric CO2. Despite the potential of this technique, its effects on the marine ecosystem
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Technical note: Assessment of float pH data quality control methods – a case study in the subpolar northwest Atlantic Ocean Biogeosciences (IF 4.9) Pub Date : 2024-03-13 Cathy Wimart-Rousseau, Tobias Steinhoff, Birgit Klein, Henry Bittig, Arne Körtzinger
Abstract. Since a pH sensor has become available that is principally suitable for use on demanding autonomous measurement platforms, the marine CO2 system can be observed independently and continuously by Biogeochemical Argo floats. This opens the potential to detect variability and long-term changes in interior ocean inorganic carbon storage and quantify the ocean sink for atmospheric CO2. In combination
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Electron backscatter diffraction analysis unveils foraminiferal calcite microstructure and processes of diagenetic alteration Biogeosciences (IF 4.9) Pub Date : 2024-03-13 Frances A. Procter, Sandra Piazolo, Eleanor H. John, Richard Walshaw, Paul N. Pearson, Caroline H. Lear, Tracy Aze
Abstract. Electron backscatter diffraction (EBSD) analysis enables a unique perspective of the internal microstructure of foraminiferal calcite. Specifically, EBSD provides crystallographic data from within the test, highlighting the highly organised “mesocrystal” structure of crystallographically aligned domains throughout the test, formed by sequential deposits of microgranular calcite. We compared
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Molecular level characterization of supraglacial dissolved organic matter sources and exported pools on the southern Greenland Ice Sheet Biogeosciences (IF 4.9) Pub Date : 2024-03-13 Eva L. Doting, Ian T. Stevens, Anne M. Kellerman, Pamela E. Rossel, Runa Antony, Amy M. McKenna, Martyn Tranter, Liane G. Benning, Robert G. M. Spencer, Jon R. Hawkings, Alexandre M. Anesio
Abstract. During the ablation season, active microbial communities colonise large areas of the Greenland Ice Sheet surface and produce dissolved organic matter (DOM) that may be exported downstream by surface melt. Meltwater flow through the bare ice interfluvial area, characterized by a porous weathering crust, is slow (~ 10-2 m d-1), meaning that it presents a potential site for photochemical and/or
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Unusual Hemiaulus bloom influences ocean productivity in Northeastern US Shelf waters Biogeosciences (IF 4.9) Pub Date : 2024-03-13 S. Alejandra Castillo Cieza, Rachel H. R. Stanley, Pierre Marrec, Diana N. Fontaine, E. Taylor Crockford, Dennis J. McGillicuddy Jr., Arshia Mehta, Susanne Menden-Deuer, Emily E. Peacock, Tatiana A. Rynearson, Zoe O. Sandwith, Weifeng Zhang, Heidi M. Sosik
Abstract. Because of its temperate location, high dynamic range of environmental conditions, and extensive human activity, the long-term ecological research site in the coastal Northeastern US Shelf (NES) of the northwestern Atlantic Ocean offers an ideal opportunity to understand how productivity shifts in response to changes in planktonic community composition. Ocean production and trophic transfer
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Seasonal dynamics and regional distribution patterns of CO2 and CH4 in the north-eastern Baltic Sea Biogeosciences (IF 4.9) Pub Date : 2024-03-13 Silvie Lainela, Erik Jacobs, Stella-Theresa Stoicescu, Gregor Rehder, Urmas Lips
Abstract. Significant research has been carried out in the last decade to describe the CO2 system dynamics in the Baltic Sea. However, there is a lack of knowledge in this field in the NE Baltic Sea, which is the main focus of the present study. We analysed the physical forcing and hydrographic background in the study year (2018) and tried to elucidate the observed patterns of surface water CO2 partial
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Reefal ostracod assemblages from the Zanzibar Archipelago (Tanzania) Biogeosciences (IF 4.9) Pub Date : 2024-03-13 Skye Yunshu Tian, Martin Langer, Moriaki Yasuhara, Chih-Lin Wei
Abstract. Tropical reefs encompass tremendous biodiversity yet are imperiled by increasing natural and anthropogenic disturbances worldwide. Meiobenthic biotas on coral reefs, for example, ostracods, may experience substantial diversity loss and compositional changes even before being examined. In this study, we investigated the reefal ostracod assemblages from the highly diverse and productive ecosystem
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Peatland evaporation across hemispheres: contrasting controls and sensitivity to climate warming driven by plant functional types Biogeosciences (IF 4.9) Pub Date : 2024-03-12 Leeza Speranskaya, David I. Campbell, Peter M. Lafleur, Elyn R. Humphreys
Abstract. Peatlands store disproportionally large amounts of carbon per unit area, a function that is dependent on maintaining high and stable water tables. Climate change is likely to negatively impact carbon storage in peatlands, in part due to increases in vapour pressure deficit (VPD) driving higher evaporation (E) rates. However, the response of E to increasing VPD depends on the dominant vegetation
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Effects of grain size and seawater salinity on magnesium hydroxide dissolution and secondary calcium carbonate precipitation kinetics: implications for ocean alkalinity enhancement Biogeosciences (IF 4.9) Pub Date : 2024-03-12 Charly Andre Moras, Tyler Cyronak, Lennart Thomas Bach, Renaud Joannes-Boyau, Kai Georg Schulz
Abstract. Understanding the impact that mineral grain size and seawater salinity have on magnesium hydroxide (Mg(OH)2) dissolution and secondary calcium carbonate (CaCO3) precipitation is critical for the success of ocean alkalinity enhancement. We tested the Mg(OH)2 dissolution kinetics in seawater using three Mg(OH)2 grain sizes (<63, 63–180 and >180 µm) and at three salinities (~36, ~28 and ~20)
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Variable contribution of wastewater treatment plant effluents to nitrous oxide emission Biogeosciences (IF 4.9) Pub Date : 2024-03-12 Weiyi Tang, Jeff Talbott, Timothy Jones, Bess B. Ward
Abstract. Nitrous oxide (N2O), a potent greenhouse gas and ozone-destroying agent, is produced during nitrogen transformations in both natural and human-constructed environments. Wastewater treatment plants (WWTPs) produce and emit N2O into the atmosphere during the nitrogen removal process. However, the impact of WWTPs on N2O emissions in downstream aquatic systems remains poorly constrained. By measuring
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Technical note: Ocean Alkalinity Enhancement Pelagic Impact Intercomparison Project (OAEPIIP) Biogeosciences (IF 4.9) Pub Date : 2024-03-12 Lennart Thomas Bach, Aaron James Ferderer, Julie LaRoche, Kai Georg Schulz
Abstract. Ocean Alkalinity Enhancement (OAE) aims to transfer carbon dioxide (CO2) from the atmosphere to the ocean by increasing the capacity of seawater to store CO2. The potential effects of OAE-induced changes in seawater chemistry on marine biology must be assessed to understand if OAE, operated at a climate relevant scale, would be environmentally sustainable. Here, we describe the design of
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Fractionation of stable carbon isotopes during formate consumption in anoxic rice paddy soils and lake sediments Biogeosciences (IF 4.9) Pub Date : 2024-03-11 Ralf Conrad, Peter Claus
Abstract. Formate is energetically equivalent to hydrogen and thus is an important intermediate during the breakdown of organic matter in anoxic rice paddy soils and lake sediments. Formate is a common substrate for methanogenesis, homoacetogenesis and sulfate reduction. However, how much these processes contribute to formate degradation and fractionate carbon stable isotopes is largely unknown. Therefore
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Insights into carbonate environmental conditions in the Chukchi Sea Biogeosciences (IF 4.9) Pub Date : 2024-03-08 Claudine Hauri, Brita Irving, Sam Dupont, Rémi Pagés, Donna D. W. Hauser, Seth L. Danielson
Abstract. Healthy Arctic marine ecosystems are essential to the food security and sovereignty, culture, and wellbeing of Indigenous Peoples in the Arctic. At the same time, Arctic marine ecosystems are highly susceptible to impacts of climate change and ocean acidification. While increasing ocean and air temperatures and melting sea ice act as direct stressors on the ecosystem, they also indirectly
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Reviews and Syntheses: Variable Inundation Across Earth’s Terrestrial Ecosystems Biogeosciences (IF 4.9) Pub Date : 2024-03-08 James Stegen, Amy Burgin, Michelle Busch, Joshua Fisher, Joshua Ladau, Jenna Abrahamson, Lauren Kinsman-Costello, Li Li, Xingyuan Chen, Thibault Datry, Nate McDowell, Corianne Tatariw, Anna Braswell, Jillian Deines, Julia Guimond, Peter Regier, Kenton Rod, Edward Bam, Etienne Fluet-Chouinard, Inke Forbrich, Kristin Jaeger, Teri O'Meara, Tim Scheibe, Erin Seybold, Jon Sweetman, Jianqiu Zheng, Daniel
Abstract. The structure, function, and dynamics of Earth’s terrestrial ecosystems are profoundly influenced by the frequency and duration that they are inundated with water. A diverse array of natural and human engineered systems experience temporally variable inundation whereby they fluctuate between inundated and non-inundated states. Variable inundation spans from extreme flooding and droughts to
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Linking northeastern North Pacific oxygen changes to upstream surface outcrop variations Biogeosciences (IF 4.9) Pub Date : 2024-03-07 Sabine Mecking, Kyla Drushka
Abstract. Understanding the response of the ocean to global warming, including the renewal of ocean waters from the surface (ventilation), is important for future climate predictions. Oxygen distributions in the ocean thermocline have proven an effective way to infer changes in ventilation because physical processes (ventilation and circulation) that supply oxygen are thought to be primarily responsible
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The 16S rDNA microbiome of the Arctic foraminifera Neogloboquadrina pachyderma is comprised of hydrocarbon-degrading bacteria and a diatom chloroplast store Biogeosciences (IF 4.9) Pub Date : 2024-03-07 Clare Bird, Kate F. Darling, Rabecca Thiessen, Anna J. Pieńkowski
Abstract. Neogloboquadrina pachyderma is the only true polar species of planktonic foraminifera. It therefore plays a crucial role in the calcite flux, and in reconstructions and modelling of seasonality and environmental change within the high latitudes. The rapidly changing environment of the polar regions of the North Atlantic and Arctic Oceans poses challenging conditions for this (sub)polar species
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Implications of climate and litter quality for simulations of litterbag decomposition at high latitudes Biogeosciences (IF 4.9) Pub Date : 2024-03-05 Elin Ristorp Aas, Inge Althuizen, Hui Tang, Sonya Geange, Eva Lieungh, Vigdis Vandvik, Terje Koren Berntsen
Abstract. Litter decomposition is a vital part of the carbon cycle and is thoroughly studied both in the field and with models. Although temporally and spatially limited, litterbag decomposition experiments are often used to calibrate and evaluate soil models intended for use on large scales, coupled to a land model. We used the microbially explicit soil decomposition model MIMICS+ to replicate two
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Representation of the Terrestrial Carbon Cycle in CMIP6 Biogeosciences (IF 4.9) Pub Date : 2024-03-04 Bettina K. Gier, Manuel Schlund, Pierre Friedlingstein, Chris D. Jones, Colin Jones, Sönke Zaehle, Veronika Eyring
Abstract. Improvements in the representation of the land carbon cycle in Earth system models participating in the Coupled Model Intercomparison Project Phase 6 (CMIP6) include interactive treatment of both the carbon and nitrogen cycles, improved photosynthesis, and soil hydrology. To assess the impact of these model developments on aspects of the global carbon cycle, the Earth System Model Evaluation
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Quantifying the δ15N trophic offset in a cold-water scleractinian coral (CWC): implications for the CWC diet and coral δ15N as a marine N cycle proxy Biogeosciences (IF 4.9) Pub Date : 2024-03-05 Josie L. Mottram, Anne M. Gothmann, Maria G. Prokopenko, Austin Cordova, Veronica Rollinson, Katie Dobkowski, Julie Granger
Abstract. The nitrogen (N) isotope composition (δ15N) of cold-water corals is a promising proxy for reconstructing past ocean N cycling, as a strong correlation was found between the δ15N of the organic nitrogen preserved in coral skeletons and the δ15N of particulate organic matter exported from the surface ocean. However, a large offset of 8 ‰–9 ‰ between the δ15N recorded by the coral and that of
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Kilometre-scale simulations over Fennoscandia reveal a large loss of tundra due to climate warming Biogeosciences (IF 4.9) Pub Date : 2024-03-05 Fredrik Lagergren, Robert G. Björk, Camilla Andersson, Danijel Belušić, Mats P. Björkman, Erik Kjellström, Petter Lind, David Lindstedt, Tinja Olenius, Håkan Pleijel, Gunhild Rosqvist, Paul A. Miller
Abstract. The Fennoscandian boreal and mountain regions harbour a wide range of vegetation types, from boreal forest to high alpine tundra and barren soils. The area is facing a rise in air temperature above the global average and changes in temperature and precipitation patterns. This is expected to alter the Fennoscandian vegetation composition and change the conditions for areal land use such as
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Variations of polyphenols and carbohydrates of Emiliania huxleyi grown under simulated ocean acidification conditions Biogeosciences (IF 4.9) Pub Date : 2024-03-05 Milagros Rico, Paula Santiago-Díaz, Guillermo Samperio-Ramos, Melchor González-Dávila, Juana Magdalena Santana-Casiano
Abstract. Global environmental changes strongly affect the growth and biochemical composition of microalgae. Cultures of the coccolithophore Emiliania huxleyi were grown under four different CO2-controlled pH conditions (7.75, 7.90, 8.10, and 8.25) to improve understanding of the adaptive mechanisms of these organisms through changes in phenolic compounds and carbohydrate content and composition under
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Discrepant long-term nitrogen mineralization in soil at early and later period after fertilization Biogeosciences (IF 4.9) Pub Date : 2024-03-05 Hongqin Zou, Minggang Xu, Keyu Ren, Dejin Li, Wenju Zhang, Changai Lu, Yinghua Duan
Abstract. Soil mineralization, the process of organic to inorganic N which balances the N uptake by crop and N loss to environment, was always quantified by short-term (one day to thirty weeks) incubation experiment. However, the residuary effect of fertilization for N mineralization, especially manure application, is long-term existed, which is important and thought to be shaped by fertilization,
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A chemical kinetics theory for interpreting the non-monotonic temperature dependence of enzymatic reactions Biogeosciences (IF 4.9) Pub Date : 2024-03-04 Jinyun Tang, William J. Riley
Abstract. One notable observation of enzymatic chemical reactions is that, for a given abundance of enzymes and substrates, temperature increases cause reaction rates to first increase consistent with the Arrhenius relationship, then plateau, and finally fall off quickly to zero at high temperatures. While many mathematical functions have been used to describe this pattern, we here propose a chemical
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Technical Note: A validated correction method to quantify organic and inorganic carbon in soils using Rock-Eval® thermal analysis Biogeosciences (IF 4.9) Pub Date : 2024-03-04 Marija Stojanova, Pierre Arbelet, François Baudin, Nicolas Bouton, Giovanni Caria, Lorenza Pacini, Nicolas Proix, Edouard Quibel, Achille Thin, Pierre Barré
Abstract. Soils contain large amounts of carbon stored as organic carbon and carbonates. These carbon pools can contribute to climate regulation, and are of primary importance in ensuring proper soil functioning. However, their accurate quantification remains a complex task. Rock-Eval® thermal analysis has emerged as an alternative to classic dry combustion and wet methods, due to its ability to simultaneously
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Ocean alkalinity enhancement in an open ocean ecosystem: Biogeochemical responses and carbon storage durability Biogeosciences (IF 4.9) Pub Date : 2024-03-04 Allanah Joy Paul, Mathias Haunost, Silvan Urs Goldenberg, Jens Hartmann, Nicolás Sánchez, Julieta Schneider, Niels Suitner, Ulf Riebesell
Abstract. Ocean alkalinity enhancement (OAE) is considered for the long-term removal of gigatons of carbon dioxide (CO2) from the atmosphere to achieve our climate goals. Little is known, however, about the ecosystem-level changes in biogeochemical functioning that may result from the chemical sequestration of CO2 in seawater, and how stable the sequestration is. We studied these two aspects in natural
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Using Free Air CO2 Enrichment data to constrain land surface model projections of the terrestrial carbon cycle Biogeosciences (IF 4.9) Pub Date : 2024-02-29 Nina Raoult, Louis-Axel Edouard-Rambaut, Nicolas Vuichard, Vladislav Bastrikov, Anne Sofie Lansø, Bertrand Guenet, Philippe Peylin
Abstract. Predicting the responses of terrestrial ecosystem carbon to future global change strongly relies on our ability to model accurately the underlying processes at a global scale. However, terrestrial biosphere models representing the carbon and nitrogen cycles and their interactions remain subject to large uncertainties, partly because of unknown or poorly constrained parameters. Parameter estimation
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Non-mycorrhizal root-associated fungi increase soil C stocks and stability via diverse mechanisms Biogeosciences (IF 4.9) Pub Date : 2024-03-01 Emiko K. Stuart, Laura Castañeda-Gómez, Wolfram Buss, Jeff R. Powell, Yolima Carrillo
Abstract. While various root-associated fungi could facilitate soil carbon (C) storage and therefore aid climate change mitigation, so far research in this area has largely focused on mycorrhizal fungi, and potential impacts and mechanisms for other fungi are largely unknown. Here, with the aim of identifying novel organisms that could be introduced to crop plants to promote C sequestration, we assessed
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Coupling relationship between soil properties and plant diversity under different ecological restoration patterns in the abandoned coal mine area of southern China Biogeosciences (IF 4.9) Pub Date : 2024-02-29 Hao Li, Wenbo Chen, Cheng Zhang, Haifen Liang
Abstract. Understanding the effects of ecological restoration in abandoned coal mine on soil and plant is important to improve the knowledge of ecosystems evolution and facilitate taking appropriate ecological restoration management practices. This study aims to evaluate the coupling relationship between plant diversity and soil properties after ecological restoration in abandoned coal mine area. The
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Biomass Yield Potential, Feedstock Quality, and Nutrient Removal of Perennial Buffer Strips under Continuous Zero Fertilizer Application Biogeosciences (IF 4.9) Pub Date : 2024-02-29 Cheng-Hsien Lin, Colleen Zumpf, Chunhwa Jang, Thomas Voigt, Guanglong Tian, Olawale Oladeji, Albert Cox, Rehnuma Mehzabin, Do Kyoung Lee
Abstract. Perennial-based buffer strips have been promoted with the potential to improve ecosystem services from riparian areas while producing biomass as livestock feed or as a bioenergy feedstock. Both biomass production and nutrient removal of buffer strips are substantially influenced by the vegetation types for the multipurpose perennial buffers. In this 2016–2019 study in Western Illinois, two
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Evaluation of CMIP6 Models Performance in Simulating Historical Biogeochemistry across Southern South China Sea Biogeosciences (IF 4.9) Pub Date : 2024-02-28 Winfred Marshal, Jing Xiang Chung, Mohd Fadzil Bin Mohd Akhir
Abstract. This study evaluates the ability of Earth System Models (ESMs) from the Coupled Model Intercomparison Project Phase 6 (CMIP6) to simulate biogeochemical variables in the southern South China Sea (SCS). The analysis focuses on chlorophyll, phytoplankton, nitrate, and oxygen at annual and seasonal scales. The models' performance is assessed against Copernicus Marine Environment Monitoring Service
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Assimilating Multi-site Eddy-Covariance Data to Calibrate the CH4 Wetland Emission Module in a Terrestrial Ecosystem Model Biogeosciences (IF 4.9) Pub Date : 2024-02-28 Jalisha Theanutti Kallingal, Marko Scholze, Paul Anthony Miller, Johan Lindström, Janne Rinne, Mika Aurela, Patrik Vestin, Per Weslien
Abstract. In this study, we use a data assimilation framework based on the Adaptive Markov Chain Monte Carlo (MCMC) algorithm to constrain process parameters in LPJ-GUESS using CH4 eddy covariance flux observations from 14 different natural boreal and temperate wetlands. The objective is to derive a single set of calibrated parameter values. These parameters are then used in the model to validate its
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Signatures of Oxygen-Depleted Waters along the Sumatra-Java Coasts in the Southeastern Tropical Indian Ocean Biogeosciences (IF 4.9) Pub Date : 2024-02-28 Faisal Hamzah, Iis Triyulianti, Agus Setiawan, Intan Suci Nurhati, Bayu Priyono, Dessy Berlianty, Muhammad Fadli, Rafidha Dh. Ahmad Opier, Teguh Agustiadi, Marsya J. Rugebregt, Weidong Yu, Zexun Wei, Huiwu Wang, R. Dwi Susanto, Priyadi D. Santoso
Abstract. A prominent ocean region exhibiting depleted oxygen concentration is the northern Indian Ocean, whose projected deoxygenation trend in response to climate change requires a comprehensive understanding of the roles of ocean dynamics. We present newly compiled in situ data across platforms (e.g. cruises, Argo, buoy) in the Indonesian coasts of Sumatra and Java between 2010–2022. Combined with
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Carbon degradation and mobilisation potentials of thawing permafrost peatlands in Northern Norway Biogeosciences (IF 4.9) Pub Date : 2024-02-28 Sigrid Trier Kjær, Sebastian Westermann, Nora Nedkvitne, Peter Dörsch
Abstract. Permafrost soils are undergoing rapid thawing due to climate change and global warming. Permafrost peatlands are especially vulnerable since they are located near the southern margin of the permafrost domain in the discontinuous and sporadic permafrost zones. They store large quantities of carbon (C) which, upon thawing, are decomposed and released as carbon dioxide (CO2), methane (CH4) or
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Atmospheric CO2 exchanges measured by eddy covariance over a temperate salt marsh and influence of environmental controlling factors Biogeosciences (IF 4.9) Pub Date : 2024-02-27 Jérémy Mayen, Pierre Polsenaere, Éric Lamaud, Marie Arnaud, Pierre Kostyrka, Jean-Marc Bonnefond, Philippe Geairon, Julien Gernigon, Romain Chassagne, Thomas Lacoue-Labarthe, Aurore Regaudie de Gioux, Philippe Souchu
Abstract. Within the coastal zone, salt marshes are atmospheric CO2 sinks and represent an essential component of biological carbon (C) stored on earth due to a strong primary production. Significant amounts of C are processed within these tidal systems which requires a better understanding of the temporal CO2 flux dynamics, the metabolic processes involved and the controlling factors. Within a temperate
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Dimethyl sulfide (DMS) climatologies, fluxes and trends – Part A: Differences between seawater DMS estimations Biogeosciences (IF 4.9) Pub Date : 2024-02-27 Sankirna D. Joge, Anoop Sharad Mahajan, Shrivardhan Hulswar, Christa Marandino, Martí Galí, Thomas Bell, Rafel Simo
Abstract. Dimethyl sulfide (DMS) is a naturally emitted trace gas that can affect the Earth's radiative budget by changing cloud albedo. Most models depend on regional or global distributions of seawater DMS concentrations and sea-air flux parameterizations to estimate its emissions. In this study, we analyze the differences between three estimations of seawater DMS, one of which is an observation-based
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Dimethyl sulfide (DMS) climatologies, fluxes, and trends – Part B: Sea-air fluxes Biogeosciences (IF 4.9) Pub Date : 2024-02-27 Sankirna D. Joge, Anoop Sharad Mahajan, Shrivardhan Hulswar, Christa Marandino, Marti Gali, Thomas Bell, Mingxi Yang, Rafel Simo
Abstract. Dimethyl sulfide (DMS) significantly contributes to cloud condensation nuclei (CCN) formation in the marine environment. DMS is ventilated from the ocean to the atmosphere, and in most models, this flux is calculated using seawater DMS concentrations and a sea-air flux parameterization. Here, climatological seawater DMS concentrations from interpolation and parameterization techniques are
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Cropland expansion drives vegetation greenness decline in Southeast Asia Biogeosciences (IF 4.9) Pub Date : 2024-02-27 Ruiying Zhao, Xiangzhong Luo, Yuheng Yang, Luri Syahid, Chi Chen, Janice Lee
Abstract. Land use and land cover changes (LUCC) is a key factor in determining regional vegetation greenness, impacting terrestrial carbon, water, and energy budgets. As a global hotspot of LUCC, Southeast Asia has experienced intensive cropland and plantation expansions in the past half-century, yet their impacts on regional greenness have not been elucidated. Here, we harmonized multiple land cover
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Effects of surface water interactions with karst groundwater on microbial biomass, metabolism, and production Biogeosciences (IF 4.9) Pub Date : 2024-02-27 Adrian Barry-Sosa, Madison K. Flint, Justin C. Ellena, Jonathan B. Martin, Brent C. Christner
Abstract. Unearthing the effects of surface water and groundwater interactions on subsurface biogeochemical reactions is crucial for developing a more mechanistic understanding of carbon and energy flow in aquifer ecosystems. To examine physiological characteristics across groundwater microbial communities that experience varying degrees of interaction with surface waters, we investigated ten springs
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Effect of the 2022 summer drought across forest types in Europe Biogeosciences (IF 4.9) Pub Date : 2024-02-26 Mana Gharun, Ankit Shekhar, Jingfeng Xiao, Xing Li, Nina Buchmann
Abstract. Forests in Europe experienced record-breaking dry conditions during the 2022 summer. The direction in which various forest types respond to climate extremes during their growing season is contingent upon an array of internal and external factors. These factors include the extent and severity of the extreme conditions and the tree ecophysiological characteristics adapted to environmental cues
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Planktic foraminifera assemblage composition and flux dynamics inferred from an annual sediment trap record in the Central Mediterranean Sea Biogeosciences (IF 4.9) Pub Date : 2024-02-26 Thibauld M. Béjard, Andrés S. Rigual-Hernández, Javier P. Tarruella, José A. Flores, Anna Sanchez Vidal, Irene Llamas Cano, Francisco J. Sierro
Abstract. The Sicily Strait, located in the central Mediterranean Sea, represents a key point for the regional oceanographic circulation as it is considered the sill that separates the western and eastern basins. Therefore, it is considered a unique zone regarding the well-documented west-to-east Mediterranean productivity gradient. Here we document the planktic foraminifera assemblages retrieved by
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Silicon isotopes in juvenile and mature Cyperus papyrus from the Okavango Delta, Botswana Biogeosciences (IF 4.9) Pub Date : 2024-02-26 Giulia Lodi, Julia Cooke, Rebecca A. Pickering, Lucie Cassarino, Mike Murray-Hudson, Keothsephile Mosimane, Daniel J. Conley
Abstract. The three most abundant stable isotopes of Silicon (Si), 28Si, 29Si, and 30Si, all occur in plants. Isotope studies are a potential tool to explore uptake and function of plant Si, and it is a developing field. However, there is a lack of studies from natural environments, and species from the African continent, and all plant parts including reproductive structures. In this study, naturally
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Compound soil and atmospheric drought events and CO2 fluxes of a mixed deciduous forest: Occurrence, impact, and temporal contribution of main drivers Biogeosciences (IF 4.9) Pub Date : 2024-02-26 Liliana Scapucci, Ankit Shekhar, Sergio Aranda-Barranco, Anastasiia Bolshakova, Lukas Hörtnagl, Mana Gharun, Nina Buchmann
Abstract. With global warming, forests are facing an increased exposure to compound soil and atmospheric drought (CSAD) events, characterized by low soil water content (SWC) and high vapor pressure deficit (VPD). Such CSAD events trigger responses in both ecosystem and forest floor CO2 fluxes, of which we know little about. In this study, we used multi-year daily and daytime above canopy (18 years;
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Tidal influence on carbon dioxide and methane fluxes from tree stems and soils in mangrove forests Biogeosciences (IF 4.9) Pub Date : 2024-02-26 Zhao-Jun Yong, Wei‐Jen Lin, Chiao-Wen Lin, Hsing-Juh Lin Lin
Abstract. Mangroves are critical blue carbon ecosystems. Measurements of methane (CH4) emissions from mangrove tree stems have the potential to reduce the uncertainty in the capacity of carbon sequestration. This study is the first to simultaneously measure the CH4 fluxes from both stems and soils throughout tidal cycles. We quantified carbon dioxide (CO2) and CH4 fluxes from mangrove tree stems of
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Building your own mountain: the effects, limits, and drawbacks of cold-water coral ecosystem engineering Biogeosciences (IF 4.9) Pub Date : 2024-02-22 Anna-Selma van der Kaaden, Sandra R. Maier, Siluo Chen, Laurence H. De Clippele, Evert de Froe, Theo Gerkema, Johan van de Koppel, Furu Mienis, Christian Mohn, Max Rietkerk, Karline Soetaert, Dick van Oevelen
Abstract. Framework-forming cold-water corals (CWCs) are ecosystem engineers that build mounds in the deep sea that can be up to several hundred metres high. The effect of the presence of cold-water coral mounds on their surroundings is typically difficult to separate from environmental factors that are not affected by the mounds. We investigated the environmental control on and the importance of ecosystem
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Reviews and syntheses: Tufa microbialites on rocky coasts towards an integrated terminology Biogeosciences (IF 4.9) Pub Date : 2024-02-22 Thomas William Garner, James Andrew Graham Cooper, Alan Smith, Gavin Rishworth, Matt Forbes
Abstract. Microbialites are known from a range of terrestrial, freshwater, marine, and marginal settings with the applied descriptive terminology depending largely on the historical legacy derived from previous studies in similar environmental settings. This has led to a diversity of nomenclature and a lack of conformity in the terms used to describe and categorise microbialites. As the role of microbial
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Lawns and meadows in urban green space – a comparison from perspectives of greenhouse gases, drought resilience and plant functional types Biogeosciences (IF 4.9) Pub Date : 2024-02-21 Justine Trémeau, Beñat Olascoaga, Leif Backman, Esko Karvinen, Henriikka Vekuri, Liisa Kulmala
Abstract. Today, city planners design urban futures by considering environmental degradation and climate mitigation. Here, we studied the greenhouse gas fluxes of urban lawns and meadows and linked the observations with plant functional types and soil properties. In eight lawns and eight meadows in the Helsinki metropolitan area, Finland, carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O)
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Using automated transparent chambers to quantify CO2 emissions and potential emission reduction by water infiltration systems in drained coastal peatlands in the Netherlands Biogeosciences (IF 4.9) Pub Date : 2024-02-21 Ralf C. H. Aben, Daniel van de Craats, Jim Boonman, Stijn H. Peeters, Bart Vriend, Coline C. F. Boonman, Ype van der Velde, Gilles Erkens, Merit van den Berg
Abstract. Worldwide, drainage of peatlands has turned these systems from CO2 sinks into sources. In the Netherlands, where ~7 % of the land surface consists of peatlands, drained peat soils contribute >90 % and ~3 % to the country’s soil-derived and total CO2 emission, respectively. Hence, the Dutch Climate Agreement set targets to cut these emissions. One potential mitigation measure is the application
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Potential impacts of cable bacteria activity on hard-shelled benthic foraminifera: implications for their interpretation as bioindicators or paleoproxies Biogeosciences (IF 4.9) Pub Date : 2024-02-20 Maxime Daviray, Emmanuelle Geslin, Nils Risgaard-Petersen, Vincent V. Scholz, Marie Fouet, Edouard Metzger
Abstract. Hard-shelled foraminifera are protists able to build a calcareous or agglutinated shell (called a “test”). Here we study the impact of sediment acidification on calcareous test preservation. For this study, sediment cores were sampled in the macrotidal Auray estuary located on the French Atlantic coast. Living and dead foraminifera were quantified until 5 cm depth and discriminated using
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UAV approaches for improved mapping of vegetation cover and estimation of carbon storage of small saltmarshes: examples from Loch Fleet, northeast Scotland Biogeosciences (IF 4.9) Pub Date : 2024-02-20 William Hiles, Lucy C. Miller, Craig Smeaton, William E. N. Austin
Abstract. Saltmarsh environments are recognised as key components of many biophysical and biochemical processes at the local and global scale. Accurately mapping these environments, and understanding how they are changing over time, is crucial for better understanding these systems. However, traditional surveying techniques are time-consuming and are inadequate for understanding how these dynamic systems
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Crowd-sourced trait data can be used to delimit global biomes Biogeosciences (IF 4.9) Pub Date : 2024-02-20 Simon Scheiter, Sophie Wolf, Teja Kattenborn
Abstract. Biomes and their biogeographic patterns have been derived from a large variety of variables including species distributions, bioclimate or remote sensing products. Yet, whether plant trait data are suitable for biome classification has rarely been tested. Here, we aimed to assess systematically which traits are most suitable for biome classification. We derived patterns of 33 different traits
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Assessment of nutrient cycling in an intensive mariculture system Biogeosciences (IF 4.9) Pub Date : 2024-02-20 Yanmin Wang, Xianghui Guo, Guizhi Wang, Lifang Wang, Tao Huang, Yan Li, Zhe Wang, Minhan Dai
Abstract. Rapid expansion of mariculture during past decades has raised substantial concerns about impacts on the coastal environment, notably eutrophication. This study focuses on one of the world’s highest density mariculture sites, Sansha Bay, Fujian Province, China, featuring integrated multi-trophic aquaculture practices involving croaker, kelp and oyster, based on examination of nutrient distributions
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Understanding the effects of revegetated shrubs on fluxes of energy, water, and gross primary productivity in a desert steppe ecosystem using the STEMMUS–SCOPE model Biogeosciences (IF 4.9) Pub Date : 2024-02-19 Enting Tang, Yijian Zeng, Yunfei Wang, Zengjing Song, Danyang Yu, Hongyue Wu, Chenglong Qiao, Christiaan van der Tol, Lingtong Du, Zhongbo Su
Abstract. Revegetation is one of the most effective ways to combat desertification and soil erosion in semiarid and arid regions. However, the impact of the perturbation of revegetation on ecohydrological processes, particularly its effects on the interplay between hydrological processes and vegetation growth under water stress, requires further investigation. This study evaluated the effects of revegetation
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Geochemical and microbial factors driving crustacean assemblages in adjacent groundwater bodies within the same aquifer Biogeosciences (IF 4.9) Pub Date : 2024-02-19 Tiziana Di Lorenzo, Stefano Amalfitano, Diana Maria Paola Galassi, Marco Melita, Annamaria Zoppini, Daniele Parrone, Stefano Ghergo, David Rossi, Agostina Tabilio Di Camillo, Elisabetta Preziosi
Abstract. Aquifers harbor unique and highly adapted species, contributing to critical ecological processes and services. Understanding the key factors driving invertebrate assemblages in aquifers is a challenging task that, traditionally, has primarily been achieved in karst aquifers. This study aimed to uncover the factors influencing the composition and functionality of groundwater crustaceans in