Journal of Geophysical Research-Oceans最新文献

筛选
英文 中文
A Study on the Southern Ocean Upwelling Over the 21st Century Under a High-Emission Scenario 高排放情景下21世纪南大洋上升流的研究
IF 3.3 2区 地球科学
Journal of Geophysical Research-Oceans Pub Date : 2025-04-22 DOI: 10.1029/2023JC020765
Fanglou Liao, Kunde Yang, Yaping Wang, Guandong Gao, Peng Zhan, Daquan Guo, Zipeng Li, Ibrahim Hoteit
{"title":"A Study on the Southern Ocean Upwelling Over the 21st Century Under a High-Emission Scenario","authors":"Fanglou Liao,&nbsp;Kunde Yang,&nbsp;Yaping Wang,&nbsp;Guandong Gao,&nbsp;Peng Zhan,&nbsp;Daquan Guo,&nbsp;Zipeng Li,&nbsp;Ibrahim Hoteit","doi":"10.1029/2023JC020765","DOIUrl":"https://doi.org/10.1029/2023JC020765","url":null,"abstract":"<p>The Southern Ocean upwelling, a crucial component of global upwelling systems, plays a key role in the global-scale redistribution of water, heat, salt, and carbon. This study aims to improve the understanding of this upwelling system by examining its climatology and future trend under a business-as-usual emission scenario, using 25 global climate model data sets. The ensemble mean of the simulated large-scale upwelling pattern in Southern Ocean follows Ekman dynamics, characterized by upwelling south of approximately 50°S and downwelling to the north. Upwelling is generally more pronounced at depths of 200 and 1,000 m (approximately 0.5 m/day) compared to 50 m (approximately 0.2 m/day). Under the high-emission scenario, both large-scale upwelling and downwelling in Southern Ocean are projected to intensify, with the net vertical volume flux expected to decrease by approximately 2 Sv (1 Sv ≡ 10<sup>6</sup> m<sup>3</sup>/s) at both 50 and 200 m by the end of the 21st century. The projected changes in zonal wind stress and wind stress curl offer a reasonable mechanism for the projected changes in Southern Ocean upwelling and downwelling, while the enhanced vertical stratification (primarily due to warming) may partially counteract the upwelling and downwelling increase. These findings are essential for understanding the response of Southern Ocean circulations to global climate change.</p>","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 4","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143861699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Model Analysis of Circumpolar Deep Water Intrusions on the Continental Shelf Break in Amundsen Sea, Antarctica 南极洲阿蒙森海陆架断裂环极深水侵入的模式分析
IF 3.3 2区 地球科学
Journal of Geophysical Research-Oceans Pub Date : 2025-04-22 DOI: 10.1029/2024JC022210
Ziang Li, Chuning Wang, Meng Zhou
{"title":"A Model Analysis of Circumpolar Deep Water Intrusions on the Continental Shelf Break in Amundsen Sea, Antarctica","authors":"Ziang Li,&nbsp;Chuning Wang,&nbsp;Meng Zhou","doi":"10.1029/2024JC022210","DOIUrl":"https://doi.org/10.1029/2024JC022210","url":null,"abstract":"<p>The ice shelves of the Amundsen Sea are in a phase of rapid melting with intruded Circumpolar Deep Water (CDW) from outside the continental shelf contributing most of the heat. Using a coupled sea ice—ice shelf—ocean general circulation model, the cross-shelf break heat flux and the mechanism of eastward undercurrent deflection are studied. Model results show higher cross-shelf break heat transfer during winter months regulated by both the barotropic and baroclinic geostrophic flow. The vorticity budget along the continental shelf break is examined using the depth-averaged vorticity budget equation based on the model's outputs. Results show that the advection of planetary vorticity (APV) and the joint effect of baroclinicity and relief (JEBAR) dominate the vorticity balance at the CDW intrusion sites on the shelf break, and the JEBAR effect is considered an effective indicator of CDW intrusion. The CDW intrusion is mainly regulated by the southward deflection of the undercurrent on the Amundsen Sea slope. Pre-deflection, the undercurrent's core lies on the southern edge of the shelf break, enabling it to modulate downstream density transport through its vertical distribution variations. Concurrent increases in undercurrent velocities and vertical extent are captured upstream of intrusion sites, supporting more CDW intrusions per unit time and altering the horizontal density gradient, thereby amplifying the JEBAR effect. Additionally, spectral analysis reveals a semiannual cycle in the JEBAR amplitude and heat flux across the Amundsen Sea slope.</p>","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 4","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JC022210","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143861698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Depth-Averaged Subtidal and Tidal Circulation off of a Rocky Shore 岩石海岸外潮下带和潮汐环流的深度平均值
IF 3.3 2区 地球科学
Journal of Geophysical Research-Oceans Pub Date : 2025-04-21 DOI: 10.1029/2024JC022047
K. J. Quinn, Falk Feddersen, Olavo B. Marques, J. H. MacMahan, S. H. Suanda
{"title":"Depth-Averaged Subtidal and Tidal Circulation off of a Rocky Shore","authors":"K. J. Quinn,&nbsp;Falk Feddersen,&nbsp;Olavo B. Marques,&nbsp;J. H. MacMahan,&nbsp;S. H. Suanda","doi":"10.1029/2024JC022047","DOIUrl":"https://doi.org/10.1029/2024JC022047","url":null,"abstract":"<p>Inner shelf circulation studies have focused mainly on alongshore uniform sandy coasts and coral reefs in subtidal and tidal bands, with far less attention given to rocky shores. This study examines depth-averaged circulation at China Rock, a rocky shore on the Monterey Peninsula, CA, with 15 ADCPs deployed for about a month. The bathymetry varies strongly on multiple lengthscales. Large-scale bathymetric features include an embayment and two headlands, whereas smaller-scale features consist of a large variety of rocks extending from the inter-tidal zone to offshore. Circulation variability encompasses subtidal, diurnal, and semidiurnal frequency bands. Velocity principal-axes ellipses decay onshore in all frequency bands indicating strong bottom friction, and have orientation variability attributable to nearby large-scale bathymetric features. Alongshore subtidal currents are reasonably well described by a wind stress and bottom friction balance, with skill similar to previous studies, but with larger linear drag coefficients, particularly in shallower waters. Cross-shore subtidal currents near the embayment are directed offshore as a bathymetrically controlled rip current strengthened by feeder currents from the headlands, with magnitude related to the incident waves. In the diurnal and semidiurnal bands, alongshore currents are attenuated onshore and the tidal phase (relative to an offshore location) decreases onshore both due to enhanced bottom friction. The attenuation is greater than on a comparable sandy shelf or coral reef, with larger phase shifts more resembling the coral reef observations. The increased linear drag friction can be related to directly measured bottom roughness.</p>","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 4","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JC022047","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143853066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Physical Drivers of a Massive Harmful Algal Bloom in the Northern Bering and Chukchi Seas in Summer 2022 2022年夏季白令海北部和楚科奇海大规模有害藻华的物理驱动因素
IF 3.3 2区 地球科学
Journal of Geophysical Research-Oceans Pub Date : 2025-04-21 DOI: 10.1029/2024JC021624
L. S. Lago, R. S. Pickart, P. Lin, F. Bahr, E. Fachon, M. L. Brosnahan, M. Pathare, W. Munlbach, K. Horn, A. Rajagopalan, D. M. Anderson
{"title":"Physical Drivers of a Massive Harmful Algal Bloom in the Northern Bering and Chukchi Seas in Summer 2022","authors":"L. S. Lago,&nbsp;R. S. Pickart,&nbsp;P. Lin,&nbsp;F. Bahr,&nbsp;E. Fachon,&nbsp;M. L. Brosnahan,&nbsp;M. Pathare,&nbsp;W. Munlbach,&nbsp;K. Horn,&nbsp;A. Rajagopalan,&nbsp;D. M. Anderson","doi":"10.1029/2024JC021624","DOIUrl":"https://doi.org/10.1029/2024JC021624","url":null,"abstract":"<p>In summer 2022 the Chukchi Sea exhibited the highest concentrations of the toxin producing dinoflagellate <i>Alexandrium catenella</i> ever recorded in the Arctic, documented by two back-to-back cruises. Here, we use the shipboard hydrographic and velocity data, together with ocean reanalysis fields, to investigate the physical factors that helped dictate the initiation and evolution of the bloom. High concentrations of <i>Alexandrium catenella</i> vegetative cells were first detected west of St. Lawrence Island, within Bering Summer Water, and were subsequently advected poleward. A backward trajectory calculation indicates that the water transporting the bloom originated from the Gulf of Anadyr, then passed through Anadyr Strait and the US side of Bering Strait, reaching 71°N roughly a month and a half later. A strong southerly wind event diverted part of the bloom into Kotzebue Sound and caused it to mix with warmer Alaskan Coastal Water, further promoting cell growth. We also investigate the possibility that part of the bloom was generated locally in the Ledyard Bay region due to germination from the large cyst bed there, as was observed in summer 2018. While such local germination may have occurred in early August, as was the case in 2018, considerably colder near-surface temperatures in 2022 would have slowed vegetative cell growth relative to conditions in 2018. Using mooring data from the Bering Strait we demonstrate that the heat flux through the strait largely dictates the timing of cyst germination in the Ledyard Bay region, and also shapes subsequent growth and accumulation of vegetative cells there.</p>","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 4","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143852796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Subsurface Cooling and Sea Surface Temperature Pattern Formation Over the Equatorial Pacific 赤道太平洋地下冷却和海面温度模式的形成
IF 3.3 2区 地球科学
Journal of Geophysical Research-Oceans Pub Date : 2025-04-20 DOI: 10.1029/2024JC022222
Feng Jiang, Richard Seager, Mark A. Cane, Christina Karamperidou, Noel G. Brizuela
{"title":"Subsurface Cooling and Sea Surface Temperature Pattern Formation Over the Equatorial Pacific","authors":"Feng Jiang,&nbsp;Richard Seager,&nbsp;Mark A. Cane,&nbsp;Christina Karamperidou,&nbsp;Noel G. Brizuela","doi":"10.1029/2024JC022222","DOIUrl":"https://doi.org/10.1029/2024JC022222","url":null,"abstract":"<p>The equatorial cold tongue region has not warmed up in response to historical radiative forcing in the real world, contrary to the strong warming often simulated by climate models. Here we demonstrate that climate models fail to represent one or both of the key processes driving observed sea surface temperature (SST) pattern formation: a realistic surface wind stress pattern shaping subsurface cooling through wind-driven circulation changes, and effective connectivity between subsurface and surface temperatures via upwelling and mixing. Consequently, none of the models approximate the observed lack of cold tongue SST warming and strengthening of zonal SST gradient across the equatorial Pacific. Furthermore, those that come closest achieve this due to interhemispheric warming differences rather than equatorial dynamics as observed. Addressing different origins of subsurface cooling in observations and simulations, and how they connect to SST, will lead to improved understanding of tropical Pacific SST changes to date and how they will evolve in the future.</p>","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 4","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JC022222","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143852915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Comprehensive Assessment of the Effects of Environmental Factors on Low-Energy Rip Currents 环境因素对低能量离岸流影响的综合评价
IF 3.3 2区 地球科学
Journal of Geophysical Research-Oceans Pub Date : 2025-04-20 DOI: 10.1029/2024JC022214
Yan Sun, Xiaodong Bian, Lulu Liu, Daoheng Zhu, Zhiqiang Li
{"title":"Comprehensive Assessment of the Effects of Environmental Factors on Low-Energy Rip Currents","authors":"Yan Sun,&nbsp;Xiaodong Bian,&nbsp;Lulu Liu,&nbsp;Daoheng Zhu,&nbsp;Zhiqiang Li","doi":"10.1029/2024JC022214","DOIUrl":"https://doi.org/10.1029/2024JC022214","url":null,"abstract":"<p>Rip currents are fast offshore currents and a critical component of nearshore circulation, significantly influencing public safety and material transport. This study employs the Generalized Additive Model, an effective approach for uncovering complex nonlinear relationships, to provide a comprehensive quantitative understanding of rip current drivers. By integrating field observations from a headland beach in southern China with Delft3D numerical modeling, which incorporates wave-current coupling, the contributions and interactions of environmental factors to low-energy rip current generation were quantified. Results indicate that rip currents form only within specific parameter combinations, with an annual occurrence rate of 5.9% in the study area. Significant nonlinear relationships were found between rip current generation and key environmental factors, including wave period (Period), significant wave height (SWH), wave direction (Direction), wind direction (WindDir), and water level. Variations in Direction and SWH were particularly influential. The formation of rip currents depends on the interaction of environmental factors, and the response to a single factor diminishes if other factors have not reached their thresholds. Certain environmental factor ranges, while not strongly influencing rip current velocity, can significantly increase rip current frequency. This distinction between rip current velocity (hazard intensity) and frequency provides novel insights into rip current generation mechanisms and supports the development of early warning systems.</p>","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 4","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JC022214","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143852916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Determination of the Coefficient of Diffusivity of Potential Vorticity in a Zonal Channel 纬向通道位涡扩散系数的确定
IF 3.3 2区 地球科学
Journal of Geophysical Research-Oceans Pub Date : 2025-04-18 DOI: 10.1029/2024JC021912
V. O. Ivchenko, B. Sinha
{"title":"Determination of the Coefficient of Diffusivity of Potential Vorticity in a Zonal Channel","authors":"V. O. Ivchenko,&nbsp;B. Sinha","doi":"10.1029/2024JC021912","DOIUrl":"https://doi.org/10.1029/2024JC021912","url":null,"abstract":"<p>Understanding mesoscale eddies and their interaction with the basin scale mean flow remains an important problem in physical oceanography. Several different approaches to parameterization of the effects of mesoscale eddies have been examined in the literature. In quasi-geostrophic potential vorticity (PV) transfer theory, mesoscale eddies are assumed on average to transfer PV downgradient and the main free parameter is the PV diffusivity coefficient, which is assumed to depend on the mean flow. Here, we adopt a new, complementary approach, which aims to develop strong constraints on the possible magnitude of the PV diffusivity due to parameters independent of the flow such as the wind stress and bottom topography. Combining results from an eddy resolving quasi-geostrophic model and a corresponding analytic model with parameterized eddies in a barotropic channel configuration, it is demonstrated that the PV diffusivity strongly varies for different types of bottom topography and for different wind stress with important consequences for the strength of the mean circulation. For monoscale (sinusoidal) topography, an algebraic equation is developed linking the PV diffusivity coefficient with the transport, wind stress, bottom topography, and geophysical and geometrical parameters. We present the result of statistical analysis of solutions of this equation with prescribed zonal transport obtained from a number of the eddy resolving model simulations and propose a new equation linking the PV diffusivity coefficient with wind stress and a parameter related to topographic roughness. We anticipate that similar relationships will hold for more realistic flow configurations and other types of mesoscale eddy closures.</p>","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 4","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JC021912","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143845922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Critical Role of Cold Eddies in the Decay of the 2004 Kuroshio Large Meander and the Persistence of the 2017 Event 冷涡在2004年黑潮大曲流衰减和2017年事件持续中的关键作用
IF 3.3 2区 地球科学
Journal of Geophysical Research-Oceans Pub Date : 2025-04-18 DOI: 10.1029/2024JC021825
Yuxiang Lu, Kai Yu, Xuhua Cheng
{"title":"The Critical Role of Cold Eddies in the Decay of the 2004 Kuroshio Large Meander and the Persistence of the 2017 Event","authors":"Yuxiang Lu,&nbsp;Kai Yu,&nbsp;Xuhua Cheng","doi":"10.1029/2024JC021825","DOIUrl":"https://doi.org/10.1029/2024JC021825","url":null,"abstract":"<p>The Kuroshio Large Meander (KLM) is a unique structure of the Kuroshio south of Japan. By analyzing eddy-resolving altimeter data and reanalysis datasets, we found that as the KLM develops, its vorticity increases, creating a subsurface potential vorticity (PV) gradient on both sides of the Izu Ridge. This gradient hinders the downstream advection of its vorticity, thereby maintaining its stable structure. A strong cold eddy with an amplitude exceeding 1 m, detached from the Kuroshio Extension (KE), was identified as a key factor in the decay of the 2004 KLM. The cold eddy carried high-PV water as it propagated westward, resulting in the gradual flattening of the subsurface PV gradient on both sides of the Izu Ridge. This process facilitated the outward advection of high-PV water, leading to the rapid decay of the KLM. The systematic northward migration of the KE and the westward shift of the KLM since 2017 prevents such eddies from decaying the KLM and plays significant roles in its maintenance.</p>","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 4","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143845921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of Climate-Responsive, Fjordscape, and Aquaculture-Associated Environmental Drivers on Fjord Hyperbenthic Community Structure 气候响应、峡湾景观和水产养殖相关环境驱动因素对峡湾超底栖生物群落结构的影响
IF 3.3 2区 地球科学
Journal of Geophysical Research-Oceans Pub Date : 2025-04-18 DOI: 10.1029/2024JC021852
S. Kjelstad, A. G. V. Salvanes, F. Zimmermann, G. Søvik, N. D. Gallo
{"title":"Effects of Climate-Responsive, Fjordscape, and Aquaculture-Associated Environmental Drivers on Fjord Hyperbenthic Community Structure","authors":"S. Kjelstad,&nbsp;A. G. V. Salvanes,&nbsp;F. Zimmermann,&nbsp;G. Søvik,&nbsp;N. D. Gallo","doi":"10.1029/2024JC021852","DOIUrl":"https://doi.org/10.1029/2024JC021852","url":null,"abstract":"<p>Marine community sensitivity to climate change can be informed by examining community patterns along current environmental gradients. Fjords provide natural laboratories for such studies due to their variable oceanographic conditions that can differ from basin to basin. Bottom trawl samples were collected from 17 fjord basins and nearshore coastal stations (59–63°N) from 2011 to 2022. We examined how climate-responsive (temperature, salinity, and oxygen) and fixed environmental variables (bottom depth, sill depth, and distance to coastline) as well as aquaculture impact score (calculated using biomass capacity within a 5 km radius) correlate with differences in hyperbenthic community biomass, diversity, and composition. We focused on fish and crustacean species composition, diversity, and biomass as well as the biomass and distribution of a recently proliferating jellyfish, <i>Periphylla periphylla</i>. Our results indicate that fixed environmental variables (e.g., bottom depth and sill depth) are important predictors of community biodiversity; biodiversity decreased with bottom depth and was highest in fjord basins with 151–250 m deep sills. Fish and crustacean biomass was negatively correlated with distance to coastline. Four community-types were identified which separated mainly by depth, geographic location (fjord or coastal), and presence of <i>P. periphylla</i>. We found limited evidence of climate-responsive or aquaculture-associated drivers being strong predictors of hyperbenthic community differences. The exception was that <i>P. periphylla</i> biomass was negatively correlated with temperature. Oxygen was not a significant predictor of any community patterns. Since West-Norwegian fjord species are common to the N. Atlantic, the study offers broader insights into community sensitivity to environmental change.</p>","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 4","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JC021852","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143845920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Critical Times for the Critical Depth Theory 临界深度理论的临界时刻
IF 3.3 2区 地球科学
Journal of Geophysical Research-Oceans Pub Date : 2025-04-18 DOI: 10.1029/2024JC021415
Žarko Kovač, Shubha Sathyendranath
{"title":"Critical Times for the Critical Depth Theory","authors":"Žarko Kovač,&nbsp;Shubha Sathyendranath","doi":"10.1029/2024JC021415","DOIUrl":"https://doi.org/10.1029/2024JC021415","url":null,"abstract":"<p>Critical Depth Hypothesis is arguably one of the longest standing biophysical theories in oceanography and is the earliest mathematically formulated theory aimed at explaining the phenomenon of phytoplankton blooms. It introduces a depth horizon, termed the critical depth, at which the integrated primary production from the surface to that depth equals the integrated loss terms within the same layer. In mixed layers deeper than the critical depth, losses dominate photosynthesis and vice versa. A related horizon in case of week mixing is the compensation depth, where the rate of photosynthesis matches the loss rate. In this paper, the effect of phytoplankton light attenuation on the critical depth is examined, showing that it creates a bio-optical feedback in the model. A new differential equation, derived for the time evolution of the compensation depth reveals that the light intensities at both the compensation depth and the critical depth are constants of motion. Exact solutions for average and total mixed layer biomass at steady state are derived, and their stability properties are analyzed. An existence of a bio-optical bifurcation is shown, in which the mixed layer depth acts as the bifurcation parameter and the critical depth is identified as the bifurcation point. Transients between steady states are also explored, and it is shown that the relation between the initial condition and the final steady state is paramount in determining whether a shallowing or deepening of the mixed layer will lead to a rise or a decline in biomass over time.</p>","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 4","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143845915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信