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Mixing of the Connecticut River Plume During Ambient Flood Tides: Spatial Heterogeneity and Contributions of Bottom-Generated and Interfacial Mixing J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-18 Michael M. Whitney, Preston Spicer, Daniel G. MacDonald, Kimberly D. Huguenard, Kelly L. Cole, Yan Jia, Nikiforos Delatolas
The Connecticut River plume is influenced by energetic ambient tides in the Long Island Sound receiving waters. The objectives of this modeling study are (a) characterizing the spatial heterogeneity of turbulent buoyancy fluxes, (b) partitioning turbulent buoyancy fluxes into bottom-generated and interfacial shear contributions, and (c) quantifying contributions to plume-integrated mixing within the
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Interannual Variability of Subpolar Mode Water in the Subpolar North Atlantic J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-18 I. Stendardo, B. Buongiorno Nardelli, S. Durante, D. Iudicone, D. Kieke
Subpolar Mode Water (SPMW) is an important water mass originating in the eastern North Atlantic. Its formation, subject to modification through oceanic interior mixing, can directly influence the volume of water contributing to the Atlantic meridional overturning circulation. Utilizing observation-based data sets spanning from 1993 to 2018, we estimated the formation rates and volume of SPMW within
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Spatial Scales of Kinetic Energy in the Arctic Ocean J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-16 Caili Liu, Qiang Wang, Sergey Danilov, Nikolay Koldonov, Vasco Müller, Xinyue Li, Dmitry Sidorenko, Shaoqing Zhang
Despite the importance of the Arctic Ocean for the large-scale circulation and climate, there is still a knowledge gap in our understanding of the spatial characteristics of the Arctic Ocean circulation, especially for the mesoscale. This paper investigates the spatial characteristics of the Arctic Ocean circulation using a simulation with 1 km horizontal resolution. We revealed that there are two
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Dynamics and Controls of Methane Oxidation in the Aerobic Waters of Eastern China Marginal Seas J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-12 Qiao Liu, Guanxiang Du, Xiao-Jun Li, Jiarui Liu, Ni Meng, Chun-Yang Li, Xiting Liu, Guiling Zhang, Gui-Peng Yang, Samantha Joye, Guang-Chao Zhuang
Aerobic methane oxidation (MOx) mediated by methanotrophs is a crucial mechanism in controlling methane emissions from the surface ocean to the atmosphere. Coastal waters dominate global oceanic methane emissions, but the dynamics, controls and roles of MOx remain largely unconstrained in the marginal seas around China. Here, we conducted a variety of biogeochemical analyses to investigate the controls
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Collapses, Maxima, Multi-Year Modulation and Trends of the Zapiola Anticyclonic Circulation: Insights From Mercator Reanalysis J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-13 Lea Poli, Camila Artana, Christine Provost, Jérôme Sirven, Ruben Le Blanc-Pressenda
The Argentine Basin hosts a unique oceanic feature: the Zapiola Anticyclonic Circulation (ZAC) located above a sedimentary deposit. Taking advantage of a high-resolution (1/12°) global ocean reanalysis (GLORYS12) we examine the ZAC over 27 years (1993–2019). The mean ZAC is bottom-intensified with bottom currents reaching 0.10 ms−1. The ZAC volume transport ranges from −18.5 to 268 Sv with a mean of
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Laboratory Investigation of Energy Dissipation and Turbulent Mixing During Internal Solitary Wave Breaking on the Rough Shelf Slope J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-09 Yeping Yuan, Yuanye Luo, Yixin Wang, Ying-Tien Lin, Qian Liu, Jinbao Song
When internal solitary waves (ISW) propagate to the continental shelf, they typically runup and break on the forereef. This process might lead to periodic temperature drops at the reef slope, which has potential to protect coral reefs from bleaching threats. A series of laboratory experiments were conducted to investigate turbulence characteristics and energy dissipation during the ISW breaking events
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Surface Heat Fluxes Drive a Two-Phase Response in Southern Ocean Mode Water Stratification J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-09 Ciara Pimm, Richard G. Williams, Dani Jones, Andrew J. S. Meijers
Subantarctic mode waters have low stratification and are formed through subduction from thick winter mixed layers in the Southern Ocean. To investigate how surface forcing affects the stratification in mode water formation regions in the Southern Ocean, a set of adjoint sensitivity experiments are conducted. The objective function is the annual-average stratification over the mode water formation region
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Signature of Mesoscale Eddies on Air-Sea Heat Fluxes in the North Indian Ocean J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-09 Yanxu Chen, Lisan Yu
Using a combination of 20-year (1999–2018) remotely-sensed air-sea heat flux products and altimeter-based eddy atlas, we investigate the signature of mesoscale eddies on sea surface temperature (SST) and air-sea turbulent latent and sensible fluxes, or simply, turbulent heat fluxes (THFs), in the North Indian Ocean. On average, eddy-induced THF feedback can approach ∼40 W m−2 k−1 for warm-core anticyclones
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Loop Current Eddies as a Possible Cause of the Rapid Sea Level Rise in the Gulf of Mexico J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-06 Gabriel Thirion, Florence Birol, Julien Jouanno
The Gulf of Mexico (GOM), with its densely populated coastline, is one of the world's most vulnerable regions to climate change and sea level (SL) rise. Over the last three decades, various works have been conducted to assess coastal SL trends around the basin using tide gauge stations, separately from studies dealing with regional dynamical processes. Using altimetry, Argo, and eddy atlas products
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East Australian Current System: Frontal Barrier and Fine-Scale Control of Chlorophyll-a Distribution J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-06 Natacha Bourg, Amandine Schaeffer, Anne Molcard
The East Australian Current (EAC), as the western boundary current of the South Pacific Gyre, governs the mesoscale circulation dynamics along the East Coast of Australia. It also exhibits meandering and instabilities that generate fine-scale structures. Understanding the interplay between these fine-scale processes and the larger-scale EAC patterns is crucial in regards to chlorophyll-a distribution
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Variability of Eddy Kinetic Energy in the Eurasian Basin of the Arctic Ocean Inferred From a Model Simulation at 1-km Resolution J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-05 Vasco Müller, Qiang Wang, Nikolay Koldunov, Sergey Danilov, Dmitry Sidorenko, Thomas Jung
Mesoscale eddies play an important role in driving the dynamics of the Arctic Ocean. Understanding their behavior is crucial for comprehending the ongoing changes in the region. In this study, by using a novel decade-long simulation at 1 km resolution with the unstructured-mesh Finite volumE Sea ice-Ocean Model, we evaluate the spatial and temporal variability of eddy kinetic energy in the Eurasian
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Influence of Physical Factors on Restratification of the Upper Water Column in Antarctic Coastal Polynyas J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-03 Yilang Xu, Weifeng (Gordon) Zhang, Ted Maksym, Rubao Ji, Yun Li, Catherine Walker
Antarctic coastal polynyas are hotspots of biological production with intensive springtime phytoplankton blooms that strongly depend on meltwater-induced restratification in the upper part of the water column. However, the fundamental physics that determine spatial inhomogeneity of the spring restratification remain unclear. Here, we investigate how different meltwaters affect springtime restratification
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The Ocean's Meridional Oxygen Transport J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-04 Esther Portela, Nicolas Kolodziejczyk, Thomas Gorgues, Jan Zika, Coralie Perruche, Alexandre Mignot
Quantification of oxygen uptake at the ocean surface and its surface-to-interior pathways is crucial for understanding oxygen concentration change in a warming ocean. We investigate the mean meridional global oxygen transport between 1950 and 2009 using coupled physical-biogeochemical model output. We introduce a streamfunction in latitude-oxygen coordinates to reduce complexity in the description
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Submesoscale Dynamics in the Bay of Bengal: Inversions and Instabilities J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-29 Taylor McKie, Andrew J. Lucas, Jennifer MacKinnon
High resolution shipboard observations reveal the complex processes controlling the evolution and subduction of a cold and salty, dense filament in the Bay of Bengal (BoB). The filament, likely formed through coastal upwelling, was advected offshore by the mesoscale velocity field, and was brought adjacent to a shallow, low salinity mixed layer by mesoscale strain. The front that formed on the Eastern
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Influence of Lee Wave Breaking on Far-Field Mixing in the Deep Ocean J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-29 Kaiwen Zheng, Zhiwei Zhang, Zhibin Yang, Hui Sun, Shoude Guan, Xiaodong Huang, Chun Zhou, Wei Zhao, Jiwei Tian
Breaking of internal lee waves generated by flow-topography interaction is an important driving mechanism for abyssal mixing. By assuming that lee-wave-driven mixing is a local process, direct measurements in the past mainly focused on the water column over rough topography. In this study, a non-local role of lee waves on remote mixing is investigated by using mooring observations in the northwestern
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Formation and Variability of Barrier Layer in the South Pacific J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-29 Jindong Jiang, Jiuxin Shi, Yaohua Zhu, Zexun Wei
The oceanic barrier layer (BL), dominated by salinity stratification, plays an important role in regulating heat exchange between the mixed layer and the interior ocean. However, the salinity contribution is ignored or underestimated when analyses relying only on temperature threshold methods. Here we introduce the Turner Angle method to quantify the salinity contribution and to obtain relatively accurate
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Turbulent Diffusivity Profiles on the Shelf and Slope at the Southern Edge of the Canada Basin J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-28 Ruby Yee, Ruth Musgrave, Elizabeth Fine, Jonathan Nash, Louis St. Laurent, Robert Pickart
Vertical profiles of temperature microstructure at 95 stations were obtained over the Beaufort shelf and shelfbreak in the southern Canada Basin during a November 2018 research cruise. Two methods for estimating the dissipation rates of temperature variance and turbulent kinetic energy were compared using this data set. Both methods require fitting a theoretical spectrum to observed temperature gradient
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Eddy-Mediated Turbulent Mixing of Oxygen in the Equatorial Pacific J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-27 Yassir A. Eddebbar, Daniel B. Whitt, Ariane Verdy, Matthew R. Mazloff, Aneesh C. Subramanian, Matthew C. Long
In the tropical Pacific, weak ventilation and intense microbial respiration at depth give rise to a low dissolved oxygen (O2) environment that is thought to be ventilated primarily by the equatorial current system (ECS). The role of mesoscale eddies and vertical mixing as potential pathways of O2 supply in this region, however, remains poorly known due to sparse observations and coarse model resolution
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Variability of Fine-Scale Chlorophyll Fronts in the Tīpaka Moana Te Moananui ā Toi Hauraki Gulf, Aotearoa New Zealand J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-27 Alexandre Lhériau-Nice, Alice Della Penna
Aotearoa New Zealand's marine environment is heavily impacted by El Niño Southern Oscillation (ENSO). Little is known about the effect of ENSO on oceanographic properties in the area or their consequences on the distribution of marine organisms. Here we characterize the spatio-temporal variability of fine-scale fronts (<10 km) in the area of the Tīpaka Moana Te Moananui ā Toi Hauraki Gulf (HG) and
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Physical and Biogeochemical Properties of California Current Upwelled Source Waters J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-26 Jerome Fiechter, Andrew M. Moore
Coastal upwelling variability in the California Current region, one of the four main eastern boundary current upwelling systems, is controlled by processes acting over a wide range of spatial and temporal scales. While the ensuing ecosystem response depends strongly on upwelled water properties, determining their exact physical and biogeochemical characteristics is notoriously difficult as it requires
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Role of Intersecting Equatorial and Coastal Waveguides Near Sri Lanka on Intraseasonal Sea Level Variability Along the West Coast of India J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-26 Iyyappan Suresh, Jérôme Vialard, Takeshi Izumo, Matthieu Lengaigne
The sea level variations along the west coast of India (WCI) significantly affect the ecosystems and fisheries, because of their tight coupling with the oxycline depths in this region, which hosts the world's largest natural hypoxic system. Here, we investigate the main causes of the WCI sea level variability. Using idealized experiments with a linear, continuously stratified ocean model, we first
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Modulation of Western South Atlantic Marine Heatwaves by Meridional Ocean Heat Transport J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-27 Marlos Goes, Shenfu Dong, Gregory R. Foltz, Gustavo Goni, Denis L. Volkov, Ilana Wainer
Marine heatwaves and cold spells are extreme surface temperature events that have been associated with adverse societal and ecosystem impacts in several regions around the globe. Predicting these events presents a challenge because of their generally short-lived nature and dependence on air-sea interactions, both locally and remotely. Here we analyze oceanic propagating features that promote the occurrence
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Impacts of Marine Heatwaves on Subsurface Temperatures and Dissolved Oxygen in the Chesapeake Bay J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-26 Nathan P. Shunk, Piero L. F. Mazzini, Ryan K. Walter
Subsurface impacts associated with Marine Heatwaves (MHWs) in estuaries are not well understood, largely due to data scarcity. Using over three decades (1986–2021) of observations from several monitoring programs, this study investigates subsurface temperature and dissolved oxygen (DO) anomalies associated with surface MHWs in the Chesapeake Bay (CB). Seasonal variability in temperature anomalies followed
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Trace and Rare Earth Element Fingerprints of Aerobic Oxidation of Methane in Seep-Dwelling Bivalves J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-26 Yuedong Sun, Pengfei Di, Jörn Peckmann, Junxi Feng, Chunhui Tao, Weifang Yang, Duofu Chen, Niu Li
Aerobic methanotrophic bacteria are pivotal in the global carbon cycle by converting methane into biomass and inorganic carbon species. Light rare earth elements (light-REE; La, Ce) are part of the metalloenzymes mediating the biochemical processes in methanotrophs. However, the partitioning of trace metals and REE in chemosymbiotic megafauna with methanotrophic endosymbionts remains largely unknown
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Feedbacks Between Estuarine Metabolism and Anthropogenic CO2 Accelerate Local Rates of Ocean Acidification and Hasten Threshold Exceedances J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-27 Stephen R. Pacella, Cheryl A. Brown, Rochelle G. Labiosa, Burke Hales, T. Chris Mochon Collura, Wiley Evans, George G. Waldbusser
Attribution of the ocean acidification (OA) signal in estuarine carbonate system observations is necessary for quantifying the impacts of global anthropogenic CO2 emissions on water quality, and informing managers of the efficacy of potential mitigation options. We present an analysis of observational data to characterize dynamics and drivers of seasonal carbonate system variability in two seagrass
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Issue Information J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-27
No abstract is available for this article.
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Intrinsic Versus Wind-Forced Great Whirl Non-Seasonal Variability J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-23 Kwatra Sadhvi, Iyyappan Suresh, Matthieu Lengaigne, Takeshi Izumo, Thierry Penduff, Jean-Marc Molines, Aftab A. Can, Jérôme Vialard
The Great Whirl (GW) is a quasi-permanent anticyclonic eddy that appears every summer monsoon offshore of the Somalia upwelling. The annual cycle of the GW is well described, but deviations from its mean seasonal cycle (hereafter non-seasonal variability) have been less explored. Satellite observations reveal that the leading mode of summer non-seasonal sea-level variability in this region is associated
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Turbulence Across the Antarctic Circumpolar Current in the Indian Southern Ocean: Micro-Temperature Measurements and Finescale Parameterizations J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-23 Yusuke Sasaki, Ichiro Yasuda, Katsuro Katsumata, Shinya Kouketsu, Hiroshi Uchida
Turbulence structures across the Antarctic circumpolar current (ACC) in the Indian Ocean at around 50°E were revealed using microstructure measurements. Depth-averaged turbulent energy dissipation rates (ε) in 320 m segments estimated using a conductivity-temperature-depth (CTD)-attached micro-temperature fast-response thermistor (FP07) were well reproduced using existing finescale parameterizations
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Elucidating Dissolved Organic Sulfur in the Coastal Environment by Improved Online Liquid Chromatography Coupled to FT-ICR Mass Spectrometry J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-21 Shuang Chen, Yulin Qi, Qiaorong Xie, Chao Ma, Shujun Zhong, Libin Wu, Pingqing Fu
Dissolved organic sulfur (DOS) is an important component of dissolved organic matter (DOM) and widely exists at the land-atmosphere interface. However, the characterization of DOS at the molecular level among different environmental samples in coastal regions has not been sufficiently focused. Here, we investigated DOS in aerosol, rainwater, and river water samples in Shanghai using an improved method–online
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Marine Heatwaves in the East Asian Marginal Seas Facilitated by Boreal Summer Intraseasonal Oscillations J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-21 Panini Dasgupta, SungHyun Nam, J. S. Saranya, M. K. Roxy
During the summer of 2016, the northern East China Sea and the southern Yellow Sea (NECS-SYS) experienced one of the most severe and devastating marine heatwaves (MHWs) on record, with a temperature anomaly exceeding 4°C. This shallow semi-enclosed continental shelf region is widely recognized as a significant hotspot for MHWs with associated incidences of harmful algae blooms. Previous studies have
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Estimating the Energy Flux of Internal Tides in the Northern South China Sea Using Underwater Gliders J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-21 Zhiyuan Gao, Zhaohui Chen, Xiaodong Huang, Haiyuan Yang, Yanhui Wang, Wei Ma, Chenyi Luo
The characteristics of the energy flux of internal tides in the northern South China Sea (SCS) were explored by analyzing a fleet of underwater gliders. It was found that the low-mode diurnal internal tides with ∼300 km wavelength in the middle basin are generated predominantly in the Luzon Strait (LS) and propagate over 1,000 km to the western SCS. However, the semidiurnal internal tides are generated
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Understanding Biases in Indian Ocean Seasonal SST in CMIP6 Models J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-20 Sebastian McKenna, Agus Santoso, Alex Sen Gupta, Andréa S. Taschetto
The latest generation of climate models continue to exhibit biases in their representation of climatological sea surface temperature (SST), affecting their ability to simulate climate variability including the Indian Ocean Dipole which is typically too strong. Here, we analyze the surface layer heat budget of the Indian Ocean to diagnose the processes leading to biases in climatological SST biases
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Aerosol Deposition and Snow Accumulation Processes From Beryllium-7 Measurements in the Central Arctic Ocean: Results From the MOSAiC Expedition J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-21 Mark P. Stephens, Chris M. Marsay, Martin Schneebeli, William M. Landing, Clifton S. Buck, Walter Geibert
We use a tracer method involving the cosmogenic radioisotope beryllium-7 (half-life = 53.3 days) to follow the deposition of aerosols and the fate of snow on the MOSAiC ice floe during winter and spring 2019–2020. When examined alongside data from earlier studies in the Arctic Ocean that covered summer and fall, Be-7 inventories indicate a summertime peak for aerosol Be-7 deposition fluxes coinciding
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Observation of Near-Inertial Waves Induced by Typhoon Lan in the Northwestern Pacific: Characteristics, Energy Fluxes and Impact on Diapycnal Mixing J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-16 Shengming Yuan, Xiaomei Yan, Linlin Zhang, Chongguang Pang, Dunxin Hu
Based on mooring observations from October 10 to 5 November 2017 at four stations in the Northwestern Pacific, the characteristics of four strong near-inertial wave (NIW) packets generated by the typhoon Lan were examined. The wave-packet analysis revealed that for the NIWs with larger horizontal wavelengths, as their interactions with the background currents were weakened, the observed frequency was
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A Study on Key Determinants in Enhancing Storm Surges Along the Coast: Interplay Between Tropical Cyclone Motion and Coastal Geometry J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-19 Xiaojuan Qian, Sooncheol Hwang, Sangyoung Son
Generalizing the relationship between cyclonic features and storm surges remains challenging because previous studies have produced diverse results for different regions and historical events. We implemented Delft3D-FM simulations and examined the synthetic effects of translation speed Vt and landfall angle α on maximum surge height (MSH) along an open coast and bay. By simulating idealized cases with
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Understanding the Role of Sharp Edges in the Propagation of Surface Gravity Waves J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-17 Jan Hitzegrad, Sebastian Köster, Christian Windt, Nils Goseberg
Ultra-rough oceanic surfaces, such as oyster reefs, are characterized by densely-packed, sharp-edged roughness elements that induce high frictional resistance on the ambient flows. To effectively employ, for example, oyster reefs as a nature-based solution in coastal protection, a detailed understanding of the frictional wave energy dissipation processes is necessary. This work reports on an experimental
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Interannual Variations of the North Equatorial Current Across the Pacific Ocean J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-20 Xueqi Liu, Hui Zhou, Hengchang Liu
The interannual variation of the North Equatorial Current (NEC) across the North Pacific Ocean and the modulation of the Pacific Decadal Oscillation (PDO) are investigated based on both observations and reduced gravity model experiments. Results reveal that the interannual variation of the NEC is highly related to El Niño-Southern Oscillation (ENSO) with unsynchronized variations both in zonal and
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Characteristics and Trends of the Campbell Plateau Meander in the Southern Ocean: 1993–2020 J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-20 Xinlong Liu, Amelie Meyer, Christopher C. Chapman
Meanders are significant features of the Antarctic Circumpolar Current in the Southern Ocean and sites of enhanced upwelling, cross-frontal tracer fluxes, and exchanges between the surface and deep ocean. They often overlap the locations of fronts and are linked to topographic features. While much is known about Southern Ocean fronts and how they are changing, the response of meanders to climate change
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Defining Mesoscale Eddies Boundaries From In-Situ Data and a Theoretical Framework J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-16 Yan Barabinot, Sabrina Speich, Xavier Carton
Mesoscale eddies play an important role in transporting water properties, enhancing air-sea interactions, and promoting large-scale mixing of the ocean. They are generally referred to as “coherent” structures because they are organized, rotating fluid elements that propagate within the ocean and have long lifetimes (months or even years). Eddies have been sampled by sparse in-situ vertical profiles
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Processes Driving Subseasonal Variations of Upper Ocean Heat Content in the Equatorial Indian Ocean J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-19 Ashneel Chandra, Noel Keenlyside, Lea Svendsen, Awnesh Singh
In the equatorial Indian Ocean, the largest subseasonal temperature variations in the upper ocean are observed below the mixed layer. Subsurface processes can influence mixed layer temperature and consequently air-sea coupling. However, the physical processes driving temperature variability at these depths are not well quantified. During the boreal winter, the Madden–Julian Oscillation (MJO) partly
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Remote Estimates of Sea Surface Nitrate and Its Trends From Ocean Color in the Northwest Pacific J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-16 Shuangling Chen, Yu Meng, Shaoling Shang, Mei Zheng, Yuntao Wang, Fei Chai
Sea surface nitrate (SSN) plays an important role in assessing new production and phytoplankton growth in the ocean, yet it has been challenging to estimate SSN from satellites due to its complex and varying relationship with different environmental proxies. The different SSN trends in the northwest Pacific reported in previous studies call for more detailed research to examine the interannual variabilities
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Field Observations of Hydrostatic Pressure Deviations in a Nearshore Sediment Bed J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-20 Melissa Marry, Diane Foster
Momentary liquefaction (ML), an instantaneous loss of effective stress between individual sand grains, is caused by the upward vertical pressure gradient of the excess pore-water pressure in the sediment during the passage of a wave. Few field experiments have provided detailed observations of vertical pressure gradients within a sediment bed. Here, a novel autonomous pressure-profiling instrument
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Physics-Informed Deep Operator Learning Based on Reduced-Order Modeling for Retrieving the Ocean Interior Density From the Surface J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-20 Yuanhong Chen, Li Liu, Chunxin Yuan, Xiang Sun, Xueen Chen, Zhiqiang Wei, Zhen Gao
Exploring methods to reconstruct the ocean interior from surface data is a crucial focus in the study of ocean processes and phenomena due to the shortage of subsurface and deep-sea data. Nonetheless, the existing methods predominantly concentrate on either data-driven or dynamical methodologies, with limited exploration of integrating the strengths of both approaches. To combine the advantages of
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Destratifying and Restratifying Instabilities During Down-Front Wind Events: A Case Study in the Irminger Sea J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-16 F. W. Goldsworth, H. L. Johnson, D. P. Marshall, I. A. Le Bras
Observations indicate that symmetric instability is active in the East Greenland Current during strong northerly wind events. Theoretical considerations suggest that mesoscale baroclinic instability may also be enhanced during these events. An ensemble of idealized numerical ocean models forced with northerly winds shows that the short time-scale response (from 10 days to 3 weeks) to the increased
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The Sensitive Area for Targeting Observations of Paired Mesoscale Eddies Associated With Sea Surface Height Anomaly Forecasts J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-13 Lin Jiang, Wansuo Duan, Hui Wang
For paired mesoscale eddies, the most sensitive initial errors in relation to sea surface height anomaly (SSHA) forecasts are investigated by utilizing the conditional nonlinear optimal perturbation (CNOP) method in a two-layer quasigeostrophic model and then the sensitive areas are identified accordingly. For counter-rotating eddies, the CNOP initial errors primarily occur within the eddies themselves
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Mississippi River Chemistry Impacts on the Interannual Variability of Aragonite Saturation State in the Northern Gulf of Mexico J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-14 Fabian A. Gomez, Rik Wanninkhof, Leticia Barbero, Sang-Ki Lee
In the northern Gulf of Mexico shelf, the Mississippi-Atchafalaya River System (MARS) impacts the carbonate system by delivering freshwater with a distinct seasonal pattern in both total alkalinity (Alk) and dissolved inorganic carbon (DIC), and promoting biologically driven changes in DIC through nutrient inputs. However, how and to what degree these processes modulate the interannual variability
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Expanding Influence of Atlantic and Pacific Ocean Heat Transport on Winter Sea-Ice Variability in a Warming Arctic J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-13 Jakob Dörr, Marius Årthun, Tor Eldevik, Anne Britt Sandø
The gradual anthropogenic-driven retreat of Arctic sea ice is overlaid by large natural (internal) year-to-year variability. In winter, sea-ice loss and variability are currently most pronounced in the Barents Sea. As the loss of winter sea ice continues in a warming world, other regions will experience increased sea-ice variability. In this study, we investigate to what extent this increased winter
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Drivers of Marine Heatwaves in the Arctic Ocean J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-13 Benjamin Richaud, Xianmin Hu, Sofia Darmaraki, Katja Fennel, Youyu Lu, Eric C. J. Oliver
Among the documented consequences of anthropogenic global warming are the increased frequency and duration of marine heatwaves in the global ocean. The literature dedicated to Arctic marine heatwaves corroborates those results, but fails to identify the heat sources and sinks. Because of the numerous feedbacks impacting polar regions, understanding the processes triggering and dissipating those extreme
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Seasonal and Interannual Variability Between Upper Ocean Processes and the Slope Current in the Region Around the Cosmonauts Sea Off East Antarctica J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-10 Shikai Yang, Meng Zhou, Xuhua Cheng
The impacts of large-scale climate variability on the current system and meridional transport in the Cosmonauts Sea off East Antarctica are studied by employing the satellite-observed absolute dynamic topography (ADT) data and reanalysis hydrographic data. Three currents converge in the Cosmonauts Sea: the Antarctic Circumpolar Current (ACC), the Weddell Gyre Eastern Branch (WGeb) and the Antarctic
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Two Key Mechanisms of Large-Scale Cross-Shelf Penetrating Fronts in the East China Sea: Flow Convergence and Thermocline Undulation J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-10 Zhiwei He, Dezhou Yang, Baoshu Yin, Hui Wu
Cross-shelf penetrating fronts (CPFs) induce significant cross-shelf exchange of water properties and nutrients, and thus are important to coastal environments. In this study, the characteristics and mechanisms of realistic large-scale CPFs in the East China Sea in summer were investigated based on a data assimilative model. The model reproduced CPFs matched well with satellite observations. Although
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The Transition Layer and Remnant Transition Layer of the Western Arctic Ocean: Stratification, Vertical Diffusivity, and Pacific Summer Water Heat Fluxes J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-10 Sylvia T. Cole, Peter A. Roemer
The exchange of heat and other tracers between the ocean interior and sea ice cover depends on vertical diffusion through the thin and strongly stratified Arctic Ocean transition layer and remnant transition layer. Ice-Tethered Profiler observations during 2004–2021 were used to characterize and investigate the active and remnant transition layers in the Beaufort Gyre region. Transition layers evolved
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The Structure and Dynamics of an Estuarine Tidal Intrusion Front J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-10 W. R. Geyer, D. K. Ralston, M. C. Haller, C. Bassett, D. Honegger
Tidal intrusion fronts are surface convergences that occur at constrictions in estuaries during the flood tide, separating incoming higher-salinity water from lower-salinity, stratified estuarine water. Previous observations of tidal intrusion fronts describe a V-shaped planform, with the apex of the V pointing into the estuary, however the significance of this structure has not been previously explained
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Oceanographic Variability in Cumberland Bay, South Georgia, and Its Implications for Glacier Retreat J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-07 Joanna C. Zanker, Emma. Young, Paul. R. Holland, Ivan D. Haigh, Paul Brickle
South Georgia is a heavily glaciated sub-Antarctic island in the Southern Ocean. Cumberland Bay is the largest fjord on the island, split into two arms, each with a large marine-terminating glacier at the head. Although these glaciers have shown markedly different retreat rates over the past century, the underlying drivers of such differential retreat are not yet understood. This study uses observations
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Potential Contributions of Ammonia-Oxidizing Microorganisms to the Distributions of Nitrous Oxide in the Northern Bering Sea J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-07 Jian Liu, Liqi Chen, Minghuang Ling, Yanpei Zhuang, Jiexia Zhang, Wangwang Ye, Youcheng Bai, Jianwen Wen, Man Wu, Liyang Zhan
Oceanic N2O is a major source of atmospheric N2O gas and is involved in global warming and ozone depletion. It is thought to be mainly produced by nitrification, denitrification and nitrifier denitrification processes mediated by ammonia-oxidizing bacteria, ammonia-oxidizing archaea (AOA) and denitrifying bacteria. The Bering Sea, especially its continental shelf area, is considered a typical source
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Characterizing Subsurface Oxygen Variability in the California Current System (CCS) and Its Links to Water Mass Distribution J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-05 Cristina Schultz, John P. Dunne, Xiao Liu, Elizabeth Drenkard, Brendan Carter
The california current system (CCS) supports a wide array of ecosystem services with hypoxia historically occurring in near-bottom waters. Limited open ocean data coverage hinders the mechanistic understanding of CCS oxygen variability. By comparing three different models with varying horizontal resolutions, we found that dissolved oxygen (DO) anomalies in the CCS are propagated from shallower coastal
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Evidence of Reflected Internal Solitary Waves in the Strait of Gibraltar J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-05 Jean-Baptiste Roustan, Lucie Bordois, Jesús Garciá-Lafuente, Franck Dumas, Francis Auclair, Xavier Carton
Large-amplitude internal solitary waves (ISWs) propagating eastward toward the Alboran Sea have long been known in the Strait of Gibraltar. New in-situ data and satellite images evidence northwestward propagating ISWs. These waves are probably the reflection of the well-known eastward propagating wave along the Moroccan shelf. A simple 2D-vertical section, run with the compressible non-hydrostatic
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An Eddy Pair in the Northwestern Bay of Bengal: Characteristics, Dynamics and Interannual Variability J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-06 Wenjing Zhong, Gengxin Chen, Xiaoqing Chu
Mesoscale eddies are active in the Bay of Bengal and have profound effects on the dynamic conditions, the transport of heat and salt, and the primary productivity. We report a pair of periodic eddies in the Bay of Bengal and examine their characteristics, dynamic mechanisms and interannual variability based on satellite observations and a nonlinear 1.5-layer reduced-gravity model. The eddy pair mainly
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Nepheloid Layer Structure and Variability Along the Highly Energetic Continental Margin of the Northern South China Sea J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-03 Tian Chen, Xiaolei Liu, Changwei Bian, Shaotong Zhang, Chunsheng Ji, Zhaosen Wu, Yonggang Jia
Observations of hydrography and suspended particles supply a large amount of information regarding material transport with respect to the changing marginal sea. To investigate the nepheloid layer structure and variability along the highly energetic continental margin of the northern South China Sea, we combined optical data and time series of acoustic backscatter data. The surface nepheloid layers
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Issue Information J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-01-30
No abstract is available for this article.
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From Particles to Flocs: Revealing Where Flocculation Occurs in the Nearfield of a Negatively-Buoyant River Plume in a Large Lake (Lake Geneva) J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-01-31 Violaine Piton, Ulrich Lemmin, François Bourrin, Htet Kyi Wynn, Valentin Kindschi, David Andrew Barry
The dynamics of sediments entering lakes in river plumes is virtually unknown. This field study provides unprecedented evidence of the initiation and evolution of suspended sediment flocculation in the nearfield of the negatively-buoyant Rhône River plume, flowing as interflow in the thermocline of stratified Lake Geneva. Sediment floc property changes (formation, size, composition, shape) with depth