Deep-Sea Research Part I-Oceanographic Research Papers最新文献

Transformations of particulate organic matter from the surface to the abyssal plain in the North Pacific as inferred from compound-specific stable isotope and microbial community analyses 从特定化合物稳定同位素和微生物群落分析推断的北太平洋深海平原表层颗粒有机质向深海平原的转化

IF 2.1 3区地球科学

Deep-Sea Research Part I-Oceanographic Research Papers Pub Date : 2025-09-23 DOI: 10.1016/j.dsr.2025.104597

Lee C. Miller , Hilary G. Close , Kalina C. Grabb , Christine L. Huffard , Fuyan Li , David M. Karl , Kenneth L. Smith , Edward F. DeLong , Claudia R. Benitez-Nelson , Jeffrey C. Drazen , Brian N. Popp

{"title":"Transformations of particulate organic matter from the surface to the abyssal plain in the North Pacific as inferred from compound-specific stable isotope and microbial community analyses","authors":"Lee C. Miller , Hilary G. Close , Kalina C. Grabb , Christine L. Huffard , Fuyan Li , David M. Karl , Kenneth L. Smith , Edward F. DeLong , Claudia R. Benitez-Nelson , Jeffrey C. Drazen , Brian N. Popp","doi":"10.1016/j.dsr.2025.104597","DOIUrl":"10.1016/j.dsr.2025.104597","url":null,"abstract":"<div><div>Particulate organic matter (POM) produced in surface waters undergoes extensive reworking and breakdown by microbial and metazoan communities as it sinks to the abyssal seafloor and serves as the base of benthic and pelagic food webs. Here, we examined how various size classes of POM in the oligotrophic North Pacific Subtropical Gyre (Station ALOHA) and in the eutrophic California Current System (Station M) undergo microbial alteration throughout the water column. Compound-specific stable isotope analysis showed that sampling method strongly impacts the type of POM quantified as export to the deep sea. Moored abyssal sediment traps captured material that matched the isotopic composition of surface POM, indicating they collected large, fast-sinking particles, in contrast to the more heavily reworked particles collected with <em>in situ</em> filtration at the same depths. Extending δ<sup>15</sup>N analyses of amino acids to bathypelagic and abyssopelagic depths for the first time, we confirmed that most particle remineralization and reworking occurs within the upper ∼400 m of the water column regardless of initial surface productivity. At Station ALOHA, we further used 16S rRNA barcoding to characterize the microbial communities associated with the POM. We found that chemolithoautotrophic ammonia-oxidizing archaea are abundant in the upper water column at Station ALOHA and that their abundance corresponded to regions of high heterotrophic reworking as indicated by amino acid isotope analysis.</div></div>","PeriodicalId":51009,"journal":{"name":"Deep-Sea Research Part I-Oceanographic Research Papers","volume":"225 ","pages":"Article 104597"},"PeriodicalIF":2.1,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145157709","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

Trophic ecology of Ophiuroidea and Asteroidea in the Clarion-Clipperton-Fracture Zone (Central Pacific) 中太平洋Clarion-Clipperton-Fracture带蛇科和星科的营养生态学研究

IF 2.1 3区地球科学

Deep-Sea Research Part I-Oceanographic Research Papers Pub Date : 2025-09-23 DOI: 10.1016/j.dsr.2025.104598

Tanja Stratmann , Erik Simon-Lledó , Marcel T.J. van der Meer , Magdalini Christodoulou , Sven Rossel , Ana Colaço

{"title":"Trophic ecology of Ophiuroidea and Asteroidea in the Clarion-Clipperton-Fracture Zone (Central Pacific)","authors":"Tanja Stratmann , Erik Simon-Lledó , Marcel T.J. van der Meer , Magdalini Christodoulou , Sven Rossel , Ana Colaço","doi":"10.1016/j.dsr.2025.104598","DOIUrl":"10.1016/j.dsr.2025.104598","url":null,"abstract":"<div><div>Abyssal seascapes represent over 50 % of the Planet's surface, but the life history traits of fauna present in these ecosystems remain poorly understood. Ophiuroidea constitute about one third of the invertebrate megabenthos assemblage between 3800 m and 4800 m water depth in the Clarion-Clipperton Fracture Zone (CCZ); Asteroidea are present in lower densities. We hypothesize that (1) Ophiuroidea, Xenophyophoroidea, and Hexactinellida have a predator-prey relationship, where Ophiuroidea feed on foraminifera- and sponge-derived organic matter (OM). (2) Ophiuroidea have a reduced dependency on fresh phytodetritus. (3) Brisingida (order of Asteroidea), often cling to stalks to have easier access to particulate OM sinking to the seafloor.</div><div>To test these three hypotheses, we combined bulk and compound-specific stable isotope analyses of fauna (Ophiuroidea, Asteroidea) and sediments with analyses of seafloor images from the eastern CCZ.</div><div>All investigated Echinodermata species had a high trophic level. Phospholipid-derived fatty acids (PLFAs) used as biomarkers suggest that <em>Silax daleus</em> consumes sedimentary detritus that is processed by its gut microbiome. <em>Ophiacantha cosmica</em> is likely a top consumer or scavenger, <em>Ophiosphalma glabrum</em> is an opportunistic omnivore ingesting phytodetritus, bacteria, Crustacea, and Foraminifera, while <em>Ophiuroglypha</em> cf. <em>polyacantha</em> (sp. 6) is a more selective omnivore. <em>Freyella benthophila</em> sits mostly on stalks of Hexactinellida and uses this elevated position to catch phytodetritus and zooplankton. <em>Freyastera</em> cf. <em>tuberculata</em>, in comparison, sits mostly on polymetallic nodules from where it preys upon Crustacea moving on the sediment surface. We confirmed that Ophiuroidea are less dependent on phytodetritus, and they consume foraminifera- and sponge derived OM.</div></div>","PeriodicalId":51009,"journal":{"name":"Deep-Sea Research Part I-Oceanographic Research Papers","volume":"225 ","pages":"Article 104598"},"PeriodicalIF":2.1,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145157708","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

Satellite-detected sea surface chlorophyll-a penetrating fronts off the south coast of Java Island 爪哇岛南海岸外，卫星探测到的海面叶绿素-a穿透锋面

IF 2.1 3区地球科学

Deep-Sea Research Part I-Oceanographic Research Papers Pub Date : 2025-09-18 DOI: 10.1016/j.dsr.2025.104593

Tengfei Xu , Dingqi Wang , Qinsheng Wei , Shujiang Li , R.D. Susanto , Guanlin Wang , Fei Teng , T. Agustiadi , M. Trenggono , Priyadi Dwi Santoso , Zexun Wei

{"title":"Satellite-detected sea surface chlorophyll-a penetrating fronts off the south coast of Java Island","authors":"Tengfei Xu , Dingqi Wang , Qinsheng Wei , Shujiang Li , R.D. Susanto , Guanlin Wang , Fei Teng , T. Agustiadi , M. Trenggono , Priyadi Dwi Santoso , Zexun Wei","doi":"10.1016/j.dsr.2025.104593","DOIUrl":"10.1016/j.dsr.2025.104593","url":null,"abstract":"<div><div>In this study, we report the phenomenon of sea surface chlorophyll-a (SSC) penetrating front south of Java Island based on satellite observations. The SSC penetrating front occurs frequently (∼17 times per month) during the upwelling season (June to November) and can also be observed (∼4 times per month) during the non-upwelling season (December to May). The offshore distance of the SSC penetrating front can reach up to 500 km and 350 km in the upwelling and non-upwelling seasons, respectively. Eddy-related advection along the eddy edges plays an important role in maintaining the SSC penetrating front by transporting nutrient-rich waters from the Java coast. The interannual variability of the SSC penetrating front is closely associated with the ENSO and IOD events, which tend to induce anomalous upwelling and enhanced mesoscale eddy activity, thereby leading to more frequent occurrences of the SSC penetrating fronts south of Java Island.</div></div>","PeriodicalId":51009,"journal":{"name":"Deep-Sea Research Part I-Oceanographic Research Papers","volume":"225 ","pages":"Article 104593"},"PeriodicalIF":2.1,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118272","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

Molluscan assemblages from the shelf and upper continental slope off Guinea-Bissau (north-west Africa) 几内亚比绍（西北非洲）陆架和上陆坡的软体动物组合

IF 2.1 3区地球科学

Deep-Sea Research Part I-Oceanographic Research Papers Pub Date : 2025-09-15 DOI: 10.1016/j.dsr.2025.104592

Sara Castillo , Ana Ramos , Fran Ramil

引用次数: 0

Biodiversity and distribution of deep-pelagic fishes from the subtropical Southwestern Atlantic 西南大西洋亚热带深海鱼类的生物多样性和分布

IF 2.1 3区地球科学

Deep-Sea Research Part I-Oceanographic Research Papers Pub Date : 2025-09-06 DOI: 10.1016/j.dsr.2025.104591

Aline Barbosa Silva , Leandro Nolé Eduardo , Juliano Lauser Coletto , Laura Alma Costa , Rafael André Avila , José Henrique Muelbert

{"title":"Biodiversity and distribution of deep-pelagic fishes from the subtropical Southwestern Atlantic","authors":"Aline Barbosa Silva , Leandro Nolé Eduardo , Juliano Lauser Coletto , Laura Alma Costa , Rafael André Avila , José Henrique Muelbert","doi":"10.1016/j.dsr.2025.104591","DOIUrl":"10.1016/j.dsr.2025.104591","url":null,"abstract":"<div><div>We conducted a biodiversity assessment of deep-pelagic fish species in the Subtropical Southwestern Atlantic Ocean, using three complementary fishing methods across depths from 97 to 2570 m between 1996 and 2022. This analysis includes 926,657 specimens, representing 74 species from 11 orders and 18 families. Using these data, we present relationships with environmental factors and a detailed species inventory illustrating diversity and dominance patterns. Distinct from other Southwestern Atlantic ecoregions, our findings reveal high species dominance coupled with relatively low diversity. Among the collected taxa, <em>Diaphus dumerilii</em> (Myctophidae) and <em>Maurolicus stehmanni</em> (Sternoptychidae) constituted over 90 % of all specimens. Analysis of their distribution in relation to water properties reveals that these species exhibit a greater tolerance to a broad range of temperature and salinity conditions, an adaptive trait that likely drives their ecological dominance in the deep-pelagic ecosystems of the study area. The dominance pattern held consistently across all fishing methods, though we observed notable variation in species diversity and abundance between collection techniques. This study provides an important assessment of the deep-pelagic fish fauna in this region, establishing a valuable baseline for future research targeting this largely unexplored fauna.</div></div>","PeriodicalId":51009,"journal":{"name":"Deep-Sea Research Part I-Oceanographic Research Papers","volume":"225 ","pages":"Article 104591"},"PeriodicalIF":2.1,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145049313","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

Factors structuring macrofaunal communities of hydrocarbon seeps along the Cascadia margin 卡斯卡迪亚边缘烃类渗漏大型动物群落结构因素

IF 2.1 3区地球科学

Deep-Sea Research Part I-Oceanographic Research Papers Pub Date : 2025-09-04 DOI: 10.1016/j.dsr.2025.104590

Penny J. McCowen , Jill R. Bourque , Donald C. Behringer , Nancy G. Prouty , Amanda W.J. Demopoulos

{"title":"Factors structuring macrofaunal communities of hydrocarbon seeps along the Cascadia margin","authors":"Penny J. McCowen , Jill R. Bourque , Donald C. Behringer , Nancy G. Prouty , Amanda W.J. Demopoulos","doi":"10.1016/j.dsr.2025.104590","DOIUrl":"10.1016/j.dsr.2025.104590","url":null,"abstract":"<div><div>Cold seeps, fueled by hydrocarbon-based chemosynthesis, support unique benthic communities that can vary across small spatial scales influenced by local geochemistry. We examined the community structure and function of macrofauna in cold seeps along the Cascadia margin on the edge of gas hydrate stability—a dynamic environment that may fluctuate as seafloor temperatures change. These communities were assessed in relation to their sediment environment to provide baseline data for these previously uninvestigated seeps and decipher the most significant variables structuring them. Specific environmental drivers investigated include sediment organic carbon, total nitrogen, C:N ratios, stable isotopes (δ<sup>13</sup>C and δ<sup>15</sup>N), redox potential, grain size, and porefluid chemistry. Macrofaunal community composition varied across locations separating into twelve distinct clusters. Several co-located cores clustered separately, indicating high heterogeneity in these communities at small spatial scales. Significant drivers of macrofauna communities included clay and sand content, C:N, δ<sup>15</sup>N values, organic carbon content, and depth. Functional trait composition was influenced by similar drivers, including depth, δ<sup>15</sup>N values, C:N, and sand content. Our results indicate similar environmental variables structure macrofaunal community composition and function across small- and large-scale gradients, contributing to our understanding of heterogeneity in local and regional factors that shape seep macrofaunal communities. This is the first investigation of macrofauna at these recently discovered seeps and provides baseline data on the hydrate stability zone for future comparisons, advancing our knowledge of broad-scale trends in seep macrofauna ecology.</div></div>","PeriodicalId":51009,"journal":{"name":"Deep-Sea Research Part I-Oceanographic Research Papers","volume":"225 ","pages":"Article 104590"},"PeriodicalIF":2.1,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145049312","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

Westward modification of Caribbean through-flow water mass structure 加勒比海通流水团结构向西改变

IF 2.1 3区地球科学

Deep-Sea Research Part I-Oceanographic Research Papers Pub Date : 2025-08-27 DOI: 10.1016/j.dsr.2025.104581

Joseph C. Gradone , W. Douglas Wilson , Scott M. Glenn , Travis N. Miles

{"title":"Westward modification of Caribbean through-flow water mass structure","authors":"Joseph C. Gradone , W. Douglas Wilson , Scott M. Glenn , Travis N. Miles","doi":"10.1016/j.dsr.2025.104581","DOIUrl":"10.1016/j.dsr.2025.104581","url":null,"abstract":"<div><div>The Caribbean Through-Flow (CTF) is a critical chokepoint for North and South Atlantic waters that form the North Atlantic western boundary current system and the upper ocean limb of the Atlantic Meridional Overturning Circulation. While the circulation and energetics of the CTF have been well studied, its water mass transformations remain poorly constrained. Using over 7700 Argo float profiles from 2014 to 2024, we document a prominent westward modification in water mass structure across the Caribbean Sea. From the eastern to western Caribbean, we observe systematic increases in ocean heat content, a deepening of isopycnals, and a freshening and deepening of the subsurface salinity maximum. These changes result in a net mid-depth (∼50–500 m) density reduction of 0.40 ± 0.27 kg m<sup>-3</sup>. We hypothesize that regional variations in mesoscale eddy activity, complex bathymetry, and meridional wind stress curl gradients drive this transformation. The resulting water mass structure has critical implications for regional climate, weather, ecosystems, and sea level rise, as it modifies the density and stratification of source waters entering the Gulf of Mexico and North Atlantic western boundary current system. Our findings highlight the importance of internal Caribbean processes in shaping upper-ocean heat and salt transport in the Atlantic and underscore the need for sustained in situ observations in the region and targeted modeling analyses of the underlying modification processes.</div></div>","PeriodicalId":51009,"journal":{"name":"Deep-Sea Research Part I-Oceanographic Research Papers","volume":"225 ","pages":"Article 104581"},"PeriodicalIF":2.1,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144906989","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

Deep water overflow through the southern gap of the Oki Spur in the Japan Sea 在日本海，深水从冲绳湾的南部缺口溢出

IF 2.1 3区地球科学

Deep-Sea Research Part I-Oceanographic Research Papers Pub Date : 2025-08-23 DOI: 10.1016/j.dsr.2025.104578

Tomoharu Senjyu , Satoru Tanimura , Takafumi Aramaki

{"title":"Deep water overflow through the southern gap of the Oki Spur in the Japan Sea","authors":"Tomoharu Senjyu , Satoru Tanimura , Takafumi Aramaki","doi":"10.1016/j.dsr.2025.104578","DOIUrl":"10.1016/j.dsr.2025.104578","url":null,"abstract":"<div><div>Water exchange processes between abyssal basins are a problem of universal interest because they control deep water climate. In this study, structure and variability of deep currents running through the southern gap of the Oki Spur from the Tsushima to Yamato Basins in the southern Japan Sea were investigated using the moored current meters and closely spaced hydrographic observations. Our observations revealed that the deep currents are cold, dense water overflows from the Tsushima Basin. Cold water spilling from the southern gap flows southward on the eastern flank of the spur as cold bottom water. Water mass analyses revealed that cold bottom water mixed with upper warmer water decreased its density during the early movement stages and then increased its density by mixing with lateral saline water. A streamtube model assuming a steady state roughly reproduced the depth, density, and velocity of cold bottom water, suggesting that it was in a near geostrophic balance. A strong southward current event accompanying the cold bottom water was observed from late December 1999 to early February 2000. An ocean reanalysis dataset showed that the event was associated with the Tsushima Current in the upper layer, suggesting that surface current variations promoted abyssal inter-basin water mass exchanges. In addition, current fluctuations of ∼10-day periods prevailed in the overflows, suggesting baroclinic instability.</div></div>","PeriodicalId":51009,"journal":{"name":"Deep-Sea Research Part I-Oceanographic Research Papers","volume":"225 ","pages":"Article 104578"},"PeriodicalIF":2.1,"publicationDate":"2025-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144903443","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

Petrogenesis of igneous rocks from the Yap Arc, west Pacific: implications for its tectonic evolution 西太平洋雅浦弧火成岩成因及其构造演化意义

IF 2.1 3区地球科学

Deep-Sea Research Part I-Oceanographic Research Papers Pub Date : 2025-08-21 DOI: 10.1016/j.dsr.2025.104577

Quanshu Yan , Shishuai Yan , Long Yuan , Zhenxuan Liu , Yanguang Liu , Gang Yang

{"title":"Petrogenesis of igneous rocks from the Yap Arc, west Pacific: implications for its tectonic evolution","authors":"Quanshu Yan , Shishuai Yan , Long Yuan , Zhenxuan Liu , Yanguang Liu , Gang Yang","doi":"10.1016/j.dsr.2025.104577","DOIUrl":"10.1016/j.dsr.2025.104577","url":null,"abstract":"<div><div>The Yap arc-trench system was formed by the westward subduction of the Pacific/Caroline Plate beneath the Philippine Sea Plate (PSP) and was subsequently influenced by the jam of the Caroline Plateau into the Yap Trench. This makes it an ideal area for deciphering the geological evolution of an island arc when an oceanic plateau approaches a subduction zone. In the present study, we analyzed the mineralogical, geochemical, and isotopic compositions of peridotite, gabbroic diorite, and volcanic rocks collected from the southern Yap Arc. The results show that: (1) the peridotites are forearc peridotites, representing residues after 10–15 % partial melting of the sub-arc mantle wedge, caused by fluids released from the subducted slab during the subduction of the oceanic plateau. These peridotites were subsequently exposed in the Yap Arc due to tectonic erosion of the subducting plate. (2) The Yap Arc gabbro diorites share similarities with infant arc lavas and may have formed through a relatively low degree of partial melting of sub-arc basic rocks. (3) The Yap Arc basalts were produced by 2–5 % partial melting of the southern Yap peridotites under the influence of approximately 0.5 % sediment input. These basalts exhibit characteristics typical of the Pacific MORB-type mantle. (4) The andesites of the Yap Arc were formed through partial melting of preexisting basic rocks at the arc front, influenced by 0.5–1 % sediment melt. Hf-Nd isotopic characteristics of the southern Yap Arc basalts have validated the entry of Pacific MORB-type mantle into the Yap sub-arc mantle via a slab gap.</div></div>","PeriodicalId":51009,"journal":{"name":"Deep-Sea Research Part I-Oceanographic Research Papers","volume":"225 ","pages":"Article 104577"},"PeriodicalIF":2.1,"publicationDate":"2025-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144888832","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

Reflections of tropical cyclone-generated near-inertial internal waves within an anticyclonic eddy in the southern Bay of Bengal 孟加拉湾南部反气旋涡旋中热带气旋产生的近惯性内波的反射

IF 2.1 3区地球科学

Deep-Sea Research Part I-Oceanographic Research Papers Pub Date : 2025-08-18 DOI: 10.1016/j.dsr.2025.104576

Yingyu Peng , Di Tian , Feng Zhou , Han Zhang , Shengming Yuan , Zifei Chen , Ruijie Ye

{"title":"Reflections of tropical cyclone-generated near-inertial internal waves within an anticyclonic eddy in the southern Bay of Bengal","authors":"Yingyu Peng , Di Tian , Feng Zhou , Han Zhang , Shengming Yuan , Zifei Chen , Ruijie Ye","doi":"10.1016/j.dsr.2025.104576","DOIUrl":"10.1016/j.dsr.2025.104576","url":null,"abstract":"<div><div>Two consecutive strong near-inertial waves (NIWs) events were observed by a subsurface mooring in the southern Bay of Bengal (BoB). The first event, directly triggered by two consecutive tropical cyclones, displayed a pronounced upward (downward) phase (energy) propagation. The second event, occurring approximately 14 days post-tropical cyclones, featured predominant downward phase propagation with a peak velocity of 11.2 cm/s at 120 m depth. Despite weak wind-generated near-inertial energy flux (WNEF) during the second event, stronger energy reflection was observed in the upper layer of an anticyclonic eddy (ACE). Analyses using rotary wavenumber and ray-tracing models revealed upward propagating energy, reduced buoyancy frequency, and enhanced vertical shear, suggesting NIW reflection within the ACE. Nonlinear internal wave interactions were identified as the mechanism behind the generation of 2f = f + f waves. In the second NIWs event, increased near-inertial energy and 2f wave formation were possibly linked to local NIWs, driven by wind stress input and the radiation of NIWs during the adjustment process induced by anticyclonic eddy instability. These results highlight the influence of ACEs on the vertical propagation of NIWs and enhance the understanding of the upper-layer mixing process in the southern BoB.</div></div>","PeriodicalId":51009,"journal":{"name":"Deep-Sea Research Part I-Oceanographic Research Papers","volume":"224 ","pages":"Article 104576"},"PeriodicalIF":2.1,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144885361","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