Progress in Oceanography最新文献_第2页

Water column structure influences variability of micronekton distribution and biodiversity in the California Current 水柱结构影响加利福尼亚海流微浮游生物分布和生物多样性的变化

IF 3.6 3区地球科学

Progress in Oceanography Pub Date : 2025-08-12 DOI: 10.1016/j.pocean.2025.103556

Adena J. Schonfeld , Ryan P. Gasbarro , Megan A. Cimino , John C. Field , Steven J. Bograd , Elliott L. Hazen , Jarrod A. Santora

{"title":"Water column structure influences variability of micronekton distribution and biodiversity in the California Current","authors":"Adena J. Schonfeld , Ryan P. Gasbarro , Megan A. Cimino , John C. Field , Steven J. Bograd , Elliott L. Hazen , Jarrod A. Santora","doi":"10.1016/j.pocean.2025.103556","DOIUrl":"10.1016/j.pocean.2025.103556","url":null,"abstract":"<div><div>Vertical water column characteristics are important features for understanding pelagic species’ distribution patterns, although they are rarely included as covariates in model-based abundance indices derived from fisheries-independent surveys. The mixed layer depth (MLD) is one such metric of the physical water column structure that could improve model-based estimates of abundance. In eastern boundary upwelling systems, water column stratification alters abiotic parameters, including temperature and availability of nutrients and light, above and below the MLD, potentially impacting the distribution and concentration of zooplankton and micronekton. To evaluate the role of MLD on individual species abundance and community biodiversity metrics, we examined 34 years (1990–2023) of catch and hydrographic data from a fisheries-independent midwater trawl survey of the epipelagic micronekton in the California Current. While global ocean models project a shoaling of the MLD with long-term ocean warming, we found no trend in MLD through time in our study area. However, we did find significant relationships between the abundance, or presence, of several species (krill, young-of-the-year [YOY] northern anchovy, YOY Pacific hake, adult Pacific sardine, YOY sanddabs, sergestid shrimp, and YOY widow rockfish), and overall species richness with MLD, which indicates that the catchability of some species may be influenced by the vertical water column structure. Additionally, we used auxiliary depth-stratified tows to assess vertical catch distributions and found significant relationships between trawl depth and species abundance and richness. Thus, accounting for MLD may reduce uncertainty in indices developed for both stock assessments and ecosystem status reports, as well as provide insights into the potential impacts of climate change on survey procedures.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"238 ","pages":"Article 103556"},"PeriodicalIF":3.6,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Nutrient supply, prey body size and biomass determine the trophic structures in marine plankton food webs 营养供给、猎物体型和生物量决定了海洋浮游生物食物网的营养结构

IF 3.6 3区地球科学

Progress in Oceanography Pub Date : 2025-08-11 DOI: 10.1016/j.pocean.2025.103557

Pei-Chi Ho , Chia-Ting Chen , Noboru Okuda , Pei-Ling Wang , Gwo-Ching Gong , Chih-hao Hsieh

{"title":"Nutrient supply, prey body size and biomass determine the trophic structures in marine plankton food webs","authors":"Pei-Chi Ho , Chia-Ting Chen , Noboru Okuda , Pei-Ling Wang , Gwo-Ching Gong , Chih-hao Hsieh","doi":"10.1016/j.pocean.2025.103557","DOIUrl":"10.1016/j.pocean.2025.103557","url":null,"abstract":"<div><div>Trophic diversity and predator–prey mass ratio (PPMR) are key indicators of trophic transfer pathways and efficiency in marine ecosystems. Horizontal trophic diversity reflects the variety of resources at the base of the planktonic food web, whereas vertical trophic diversity represents the maximum food chain length. In size-structured marine food webs, community PPMR indicates the general prey size preference of zooplankton. In this study, we used size-fractionated stable isotope analyses (δ<sup>13</sup>C and δ<sup>1</sup><sup>5</sup>N) to assess horizontal and vertical trophic diversity and community PPMR, examining how nutrient supply influences the biomass and body size distribution of prey communities, and in turn affects size-structured trophic interactions. Our long-term monitoring across a nutrient gradient revealed that higher nutrient concentrations increased horizontal trophic diversity, suggesting that zooplankton exhibit more diverse prey preferences across size classes. Conversely, an increase in large autotrophic microplankton reduced vertical trophic diversity, indicating a shift in mesozooplankton feeding from heterotrophic microplankton to autotrophs, thereby shortening the food chain. In regions with low autotrophic microplankton biomass, community PPMR decreased with increasing total prey biomass, implying that mesozooplankton preferentially fed on heterotrophic microzooplankton in picoplankton-dominated, high-productivity systems. These findings highlight how nutrient availability shapes size-structured plankton food webs by altering the biomass and size composition of prey communities.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"238 ","pages":"Article 103557"},"PeriodicalIF":3.6,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144830116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Sleeping in separate rooms: Habitat partitioning between a small epipelagic and a mesopelagic fish in a semi-enclosed deep Gulf 在不同的房间里睡觉：在半封闭的深海湾中，一条小的上层鱼类和一条中上层鱼类之间的栖息地划分

IF 3.6 3区地球科学

Progress in Oceanography Pub Date : 2025-08-10 DOI: 10.1016/j.pocean.2025.103555

Manuela Parietti , Brenda Temperoni , Luciano N. Padovani , Aylén Fernández-Abud , Bruno V. Menna , Ariel G. Cabreira , Germán E. Buratti , Claudio C. Buratti

{"title":"Sleeping in separate rooms: Habitat partitioning between a small epipelagic and a mesopelagic fish in a semi-enclosed deep Gulf","authors":"Manuela Parietti , Brenda Temperoni , Luciano N. Padovani , Aylén Fernández-Abud , Bruno V. Menna , Ariel G. Cabreira , Germán E. Buratti , Claudio C. Buratti","doi":"10.1016/j.pocean.2025.103555","DOIUrl":"10.1016/j.pocean.2025.103555","url":null,"abstract":"<div><div>Spatial aggregation patterns, feeding ecology, and potential dietary overlap of a small epipelagic fish (<em>Engraulis anchoita</em>) and a mesopelagic fish (<em>Maurolicus</em> spp.) were examined in the semi-enclosed San Matías Gulf (Southwest Atlantic Ocean; 40°47′ S – 42°13′ S) during austral spring, focusing on two sectors of the tidal front (NW: northwest; SE: southeast). Acoustic data, stomach content analysis (prey relative importance; Schoener index), CTD profiles (<em>in situ</em> temperature and salinity), satellite chlorophyll-<em>a</em>, zooplankton sampling (200 μm mesh), and multi-model inference were combined to assess competition and/or resource partitioning between species. <em>Engraulis anchoita</em> occurred mostly nearshore, while <em>Maurolicus</em> spp. was associated with deeper waters, both co-occurring at 100–150 m and more abundant in NW, influenced by bottom temperature and salinity. The dominant prey for both species was the copepod <em>Calanus australis</em> (more consumed in SE). <em>E. anchoita</em> also consumed Decapoda larvae, Copepoda (1–2 mm), and Chaetognatha (preferred in NW), while <em>Maurolicus</em> spp. fed on Euphausiacea (more in SE) and conspecific eggs (in NW). These patterns aligned with zooplankton availability, shaped by southern shelf water intrusion. A dietary shift was observed in both species, from meso- to macrozooplankton with increasing size. No dietary overlap was detected, suggesting habitat partitioning and coexistence. These results underscore the ecological role of both species in linking zooplankton to higher trophic levels in a unique deep Gulf environment, providing an opportunity to test coexistence and resource use by this pelagic species.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"238 ","pages":"Article 103555"},"PeriodicalIF":3.6,"publicationDate":"2025-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144830115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Decline in C:N:P ratios of particulate organic matter during the fall intermonsoon in the northern Indian Ocean 北印度洋秋季季风间期颗粒有机质C:N:P比值的下降

IF 3.6 3区地球科学

Progress in Oceanography Pub Date : 2025-08-07 DOI: 10.1016/j.pocean.2025.103546

Deepika Sahoo , Sipai Nazirahmed, Sanjeev Kumar, Arvind Singh

{"title":"Decline in C:N:P ratios of particulate organic matter during the fall intermonsoon in the northern Indian Ocean","authors":"Deepika Sahoo , Sipai Nazirahmed, Sanjeev Kumar, Arvind Singh","doi":"10.1016/j.pocean.2025.103546","DOIUrl":"10.1016/j.pocean.2025.103546","url":null,"abstract":"<div><div>Recent studies have delineated the stoichiometric (C:N:P) dependency of phytoplankton on environmental and biological factors in the ocean and leveraged these findings in global climate models. However, model projections for low latitude regions remain largely uncertain due to insufficient observations. Here, we have investigated the regional scale stoichiometric variations of particulate organic matter (POM) in the northern Indian Ocean, encompassing the Bay of Bengal and the Arabian Sea, during the fall intermonsoon. The mean C:N:P ratios of POM in the Arabian Sea (126:24:1) and in the Bay of Bengal (148:25:1) were lower than those during the other seasons in the northern Indian Ocean. While N:P and C:P ratios remain invariant, C:N ratio showed variation in the top layer across the basins (surface to 25–60 m in the Arabian Sea and surface to 42–60 m in the Bay of Bengal). We suggest that the <em>Prochlorococcus</em> and <em>Synechococcus</em> control the C:N ratio in the Bay of Bengal, while nutrients and temperature regulate the ratio in the Arabian Sea. Contrary to the expected increase in C:N ratio (8–9) in oligotrophic conditions, the ratio was close to the Redfield ratio (6.6). The decrease in C:N ratio could be attributed to the heterotrophic bacterial (C:N = 3.8–4.5) dominance in the plankton community during the fall intermonsoon. Our analysis might be useful in evaluating the regional importance of temperature, nutrients, and plankton community composition on biogeochemical elemental cycling.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"238 ","pages":"Article 103546"},"PeriodicalIF":3.6,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144830117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Neoichnological analysis of the Aleutian Trench: characterization of lebensspuren assemblages and seafloor bioturbation intensity on both sides of the trench 阿留申海沟的新技术分析：海沟两侧lebensspuren组合特征和海底生物扰动强度

IF 3.6 3区地球科学

Progress in Oceanography Pub Date : 2025-07-31 DOI: 10.1016/j.pocean.2025.103545

Olmo Miguez-Salas , Hanieh Saeedi

{"title":"Neoichnological analysis of the Aleutian Trench: characterization of lebensspuren assemblages and seafloor bioturbation intensity on both sides of the trench","authors":"Olmo Miguez-Salas , Hanieh Saeedi","doi":"10.1016/j.pocean.2025.103545","DOIUrl":"10.1016/j.pocean.2025.103545","url":null,"abstract":"<div><div>At six deep-sea stations (water depth range of 4299–5327 m) on the slopes of the Aleutian Trench (AT), a neoichnological analysis was conducted based on lebensspuren assemblage characterization and seafloor bioturbation intensity (SBI). Lebensspuren assemblages and SBI were assessed at three stations on either side of the AT. This study investigated whether the AT creates two distinct biogeographic areas for the tracemaker community. A total of 17,150 lebensspuren were classified, corresponding to 55 morphotypes. Although the density of lebensspuren was higher at the northern slope stations, no significant differences in diversity and general lebensspuren assemblage composition were observed between the two slopes. These results suggest that the AT may not act as a natural geomorphic barrier for the tracemaker community. Overall, SBI calculations showed a strong negative correlation with Chl-a, sand concentration, total organic carbon, and bottom currents; while a strong positive correlation was observed with depth, silt concentration, and temperature. However, SBI associated with digesting lebensspuren assemblages appeared to have been primarily influenced, Chl-a, total organic carbon, clay and sand concentration. SBI associated with resting and locomotion lebensspuren assemblages are controlled by multiple factors such as depth, silt concentration, temperature, silicate, phosphate and nitrate. These findings highlight the complexity of deep-sea ecosystems for tracemaker communities and the significant role of different environmental factors on lebensspuren assemblages and SBI, reinforcing the importance of further research in these heterogeneous and understudied environments.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"238 ","pages":"Article 103545"},"PeriodicalIF":3.6,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144766853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Seamounts create local hotspots of per- and polyfluoroalkyl substances in the oligotrophic open ocean 海山在少营养的开放海洋中造成了全氟烷基和多氟烷基物质的局部热点

IF 3.8 3区地球科学

Progress in Oceanography Pub Date : 2025-07-24 DOI: 10.1016/j.pocean.2025.103543

Bowen Hou , Jialin Tang , Qijun Gong , Zhihui Yang , Lilan Zhang , Dong Sun

{"title":"Seamounts create local hotspots of per- and polyfluoroalkyl substances in the oligotrophic open ocean","authors":"Bowen Hou , Jialin Tang , Qijun Gong , Zhihui Yang , Lilan Zhang , Dong Sun","doi":"10.1016/j.pocean.2025.103543","DOIUrl":"10.1016/j.pocean.2025.103543","url":null,"abstract":"<div><div>As one persistent organic pollutant, per- and polyfluoroalkyl substances (PFAS) are widely present in oceans. Seamounts, widely distributed in the global deep sea, are hotspots for marine biodiversity and a wide range of fishery resources, can dramatically alter ocean currents direction and then regulate the distribution of pollutants. However, their impact on PFAS distribution is still unknown. This study conducted the first comprehensive depth-profile investigation of PFAS distribution in the Caiwei, Weijia, and Fedorov seamounts along the Magellan Seamount Chain in the Northwestern Pacific. Here, we report 15 targeted PFAS in seawater of the deep-sea seamount. The main findings of the study are as follows: (1) the average depth-integrated concentration of PFAS in the water column shallower than 1000 m at seamount summits were 112.0 ± 78.4 pg/L, which were 1.4 times higher than those at the surrounding basin reference stations; (2) the mesopelagic zone of seamounts is a hotspot for PFAS distribution, characterized by obvious enrichment, highlighting a distinct “PFAS seamount effect”; (3) alternative PFAS account for a higher proportion than legacy PFAS and exists obvious enrichment in the mesopelagic zone, indicating that alternative PFAS are the dominated PFAS pollutants in this region. This study highlights the importance of enhanced baseline monitoring of pollutants, particularly alternative PFAS concentrations, in conservation efforts for seamount protection strategies.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"237 ","pages":"Article 103543"},"PeriodicalIF":3.8,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144711394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Acoustic evidence of fronts and warm currents as hotspots for biological aggregation in the winter Eastern China shelf Sea 锋和暖流作为中国东部陆架海冬季生物聚集热点的声学证据

IF 3.8 3区地球科学

Progress in Oceanography Pub Date : 2025-07-24 DOI: 10.1016/j.pocean.2025.103542

Lingyun Nie , Jianchao Li , Yang Liu , Peng Sun , Zhenjiang Ye , Honghai Zhang , Shuyang Ma , Wenchao Zhang , Yongjun Tian

{"title":"Acoustic evidence of fronts and warm currents as hotspots for biological aggregation in the winter Eastern China shelf Sea","authors":"Lingyun Nie , Jianchao Li , Yang Liu , Peng Sun , Zhenjiang Ye , Honghai Zhang , Shuyang Ma , Wenchao Zhang , Yongjun Tian","doi":"10.1016/j.pocean.2025.103542","DOIUrl":"10.1016/j.pocean.2025.103542","url":null,"abstract":"<div><div>Marine organism hotspots are critical for sustaining ecosystems and marine biological resources. However, remote sensing and station sampling alone cannot fully capture the detailed biological aggregation patterns beneath the sea surface, particularly in dynamic and rapidly shifting shelf-sea environments. The Eastern China Shelf Sea (ECSS) exhibits high productivity during winter, with strong fronts formed by different water masses. The suitability of the overwintering environment (warm and high nutrient) directly influences population recruitment dynamics. We aimed to use the sound scattering layer (SSL) as an indicator of biological hotspots in the ECSS during the winter of 2019/2020. Additionally, Generalized Additive Models (GAMs) were employed to investigate the effects of abiotic factors on SSL metrics. Our findings include: (1) The SSL was primarily located in the frontal and warm-current regions, with greater biological aggregation on the warm side of the front; (2) Diurnal variations in SSL depth were more pronounced in far shore warm water zones; (3) Fortnightly SSL variability, with SSL occurrences centered around the full moon spring tide, and greater acoustically observed biomass during spring tide than neap tide. In contrast to remote sensing, acoustics effectively captures hotspots of unseen underwater organism aggregation. These findings provide acoustic evidence that fronts and warm currents serve as hotspots for biological aggregation, enhancing our understanding of the relationship between aggregation and ocean biogeophysical processes from an underwater acoustic perspective.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"237 ","pages":"Article 103542"},"PeriodicalIF":3.8,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144711393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Nutrient supply to the euphotic layer by the advection and vertical mixing over the Kuroshio and Kuroshio Extension 黑潮和黑潮延伸区上空平流和垂直混合向光层提供养分

IF 3.6 3区地球科学

Progress in Oceanography Pub Date : 2025-07-23 DOI: 10.1016/j.pocean.2025.103544

Yingying Hu , Xinyu Guo , Yoshikazu Sasai , Eisuke Tsutsumi , Ayako Nishina , Hirohiko Nakamura , Daisuke Hasegawa , Takeshi Matsuno

{"title":"Nutrient supply to the euphotic layer by the advection and vertical mixing over the Kuroshio and Kuroshio Extension","authors":"Yingying Hu , Xinyu Guo , Yoshikazu Sasai , Eisuke Tsutsumi , Ayako Nishina , Hirohiko Nakamura , Daisuke Hasegawa , Takeshi Matsuno","doi":"10.1016/j.pocean.2025.103544","DOIUrl":"10.1016/j.pocean.2025.103544","url":null,"abstract":"<div><div>The Kuroshio carries a large amount of nutrients from the east of Luzon Island to the south of Japan. However, only nutrients transported into the euphotic layer can be utilized by phytoplankton. We use the results of an eddy-resolving coupled physical-biological model to investigate (1) the horizontal and vertical transport of nitrate into the euphotic layer (0–100 m) in the Kuroshio and Kuroshio Extension and (2) the contribution of different sources of nitrate (coastal, deep layer and open ocean) to the spatial variation of downstream transport within the euphotic layer along the Kuroshio and Kuroshio Extension. As a mean state, the downstream transport of nitrate in the euphotic layer varies as 2.8 kmol s<sup>−1</sup> east of Luzon Island, 7.9 kmol s<sup>−1</sup> east of Taiwan, 8.9 kmol s<sup>−1</sup> near the Tokara Strait, 21.5 kmol s<sup>−1</sup> near the Izu-Ogasawara Ridge and 19.6 kmol s<sup>−1</sup> around 160°E. Vertical transport from the bottom of the euphotic layer around the Luzon Strait due to the uplifting of the potential density layer is an important contribution to the increase in downstream transport of nitrate by 3.8 kmol s<sup>−1</sup>. Horizontal transport from Japan coast area contributes 14.3 kmol s<sup>−1</sup> of nitrate to the Kuroshio mainstream. An interesting staggered upward and downward distribution of vertical velocity, which can be explained by conservation of the potential vorticity, was found in the Kuroshio Extension and contributed a total nitrate transport of 5.2 kmol s<sup>−1</sup> to the euphotic layer. We also calculated the vertical flux of nitrate resulting from vertical mixing based on observations and demonstrated that vertical mixing can provide a nitrate flux into the euphotic layer in the Kuroshio region comparable to that supplied by vertical velocity.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"237 ","pages":"Article 103544"},"PeriodicalIF":3.6,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144738145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Temporal variability of phytoplankton biomass and algae blooms in the open Black Sea 黑海开阔海域浮游植物生物量和藻类大量繁殖的时间变异性

IF 3.8 3区地球科学

Progress in Oceanography Pub Date : 2025-07-18 DOI: 10.1016/j.pocean.2025.103541

Oleg Yunev , Jacob Carstensen , Vyacheslav Suslin , Vladimir Belokopytov , Ludmila Stelmakh , Elena Zhuk

{"title":"Temporal variability of phytoplankton biomass and algae blooms in the open Black Sea","authors":"Oleg Yunev , Jacob Carstensen , Vyacheslav Suslin , Vladimir Belokopytov , Ludmila Stelmakh , Elena Zhuk","doi":"10.1016/j.pocean.2025.103541","DOIUrl":"10.1016/j.pocean.2025.103541","url":null,"abstract":"<div><div>This study investigated long-term changes and seasonality of phytoplankton carbon biomass and algae blooms in the open Black Sea surface layer within the post-eutrophication period (1998–2022). Phytoplankton carbon biomass was calculated from satellite-derived chlorophyll <em>a</em> concentration using carbon-to-chlorophyll <em>a</em> ratio from in situ measurements. This allowed us to identify the months experiencing algal blooms within this period (August – November). We show that phytoplankton biomass and bloom frequency were negatively coupled to the vertical density gradient, suggesting that these features were driven possibly by large diatoms harvesting nutrients from deeper depths. Our results also suggest that photoinhibition, together with high vertical density gradients, could reduce phytoplankton biomass and blooms in the surface layer during summer, with the first signs of alleviation in August. Our study also discusses the large differences in drivers of the phytoplankton community between three distinct periods: the pre-eutrophication (before the early 1970 s), intense phase of eutrophication (mid-1980 s – early 1990 s) and post-eutrophication, and conclude that decadal changes in climate and nutrient inputs caused substantial changes in phytoplankton biomass and algae blooms.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"237 ","pages":"Article 103541"},"PeriodicalIF":3.8,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144665075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Responses of Subantarctic mode water spreading to Southern Annular Mode in Southern Indian Ocean 南印度洋亚南极模态水向南环状模态扩散的响应

IF 3.8 3区地球科学

Progress in Oceanography Pub Date : 2025-07-17 DOI: 10.1016/j.pocean.2025.103540

Zishan Qiu , Jian Lan , Zexun Wei , Tengfei Xu

{"title":"Responses of Subantarctic mode water spreading to Southern Annular Mode in Southern Indian Ocean","authors":"Zishan Qiu , Jian Lan , Zexun Wei , Tengfei Xu","doi":"10.1016/j.pocean.2025.103540","DOIUrl":"10.1016/j.pocean.2025.103540","url":null,"abstract":"<div><div>The Subantarctic Mode Water (SAMW) is a voluminous water mass with relatively uniform physical properties in the Southern Ocean and plays an important role in ocean heat uptake, transport, and storage. Based on Argo observations, this study investigates how the spreading of Southeast Indian Subantarctic Mode Water (SEISAMW) responds to the Southern Annular Mode (SAM). The results show that the meridional shift of the outcrop line, which controls the variations of SEISAMW spreading, is closely linked to the SAM index. This shift is dominated by the SAM-related Ekman transport and surface flux. During positive phase of SAM, in response to the weakening of westerlies in the central of Southern Indian Ocean, where lighter (26.6–26.7 <em>σ<sub>θ</sub></em>) SEISAMW forms, the latent heat loss is reduced and Ekman heat transport exhibits positive anomalies, leading to the increase of sea surface temperature (SST). As a result, the outcrop line shifts poleward, which favors less lighter SEISAMW spreading into subtropical gyre. Meanwhile, the southwest wind anomaly south of Australia, where denser (26.7–26.9 <em>σ<sub>θ</sub></em>) SEISAMW forms, brings the cold dry air from higher latitudes and leads to the enhanced evaporation, combined with reduced precipitation, resulting in the increased sea surface salinity (SSS). Consequently, the outcrop line shifts equatorward, which favors more denser SEISAMW spreading into subtropical gyre. The opposite occurs during negative phase of SAM.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"237 ","pages":"Article 103540"},"PeriodicalIF":3.8,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144653492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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