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Mass accumulation rates decreased in the Skagerrak basin over the last 100 years
IF 2.1 3区 地球科学
Continental Shelf Research Pub Date : 2025-01-21 DOI: 10.1016/j.csr.2025.105411
Timo Spiegel , Andrew W. Dale , Nina Lenz , Mark Schmidt , Matthias Moros , Sebastian Lindhorst , Hendrik Wolschke , Daniel Müller , Martin Butzin , Michael Fuhr , Habeeb Thanveer Kalapurakkal , Sabine Kasten , Klaus Wallmann
{"title":"Mass accumulation rates decreased in the Skagerrak basin over the last 100 years","authors":"Timo Spiegel ,&nbsp;Andrew W. Dale ,&nbsp;Nina Lenz ,&nbsp;Mark Schmidt ,&nbsp;Matthias Moros ,&nbsp;Sebastian Lindhorst ,&nbsp;Hendrik Wolschke ,&nbsp;Daniel Müller ,&nbsp;Martin Butzin ,&nbsp;Michael Fuhr ,&nbsp;Habeeb Thanveer Kalapurakkal ,&nbsp;Sabine Kasten ,&nbsp;Klaus Wallmann","doi":"10.1016/j.csr.2025.105411","DOIUrl":"10.1016/j.csr.2025.105411","url":null,"abstract":"<div><div>Since the 19th century, the North Sea sediment system has been subject to a dynamic hydrographic regime and intense human alteration. The Skagerrak serves as the largest depocenter for suspended sediment originating from the North Sea. Thus, deposits in the Skagerrak provide a historical record of potential shifts in the sediment cycle of the North Sea. Despite the availability of mass accumulation rate (MAR) data in the Skagerrak, previous studies focused on steady-state reconstructions and little is known about how these rates may have changed over time. To address this knowledge gap, we present age-depth models based on the natural radionuclide <sup>210</sup>Pb and the anthropogenic time markers <sup>137</sup>Cs, fraction modern <sup>14</sup>C (F<sup>14</sup>C) and mercury (Hg) to determine the MAR before and after the year 1963 at six stations in the deep Skagerrak basin between 434 and 677 m water depth. We applied 1963 as the boundary since this year is constrained by <sup>137</sup>Cs and F<sup>14</sup>C peaks in the sediment cores due to atomic weapons testing and changes in sedimentary Hg contents. Our primary result reveals that the MAR in the deep Skagerrak basin decreased from 0.17 to 0.14 g cm<sup>−2</sup> yr<sup>−1</sup> averaged across the stations. We further simulate the effect of bioturbation on the solid phase profiles by applying a reaction transport model to the data, revealing that the decline in MAR is more pronounced when bioturbation is considered (from 0.17 to 0.09 g cm<sup>−2</sup> yr<sup>−1</sup>). Decreasing MARs in the Skagerrak basin indicate that the sediment system of the North Sea substantially changed over time. Possible reasons include a shift in the North Sea circulation pattern, enhanced sediment trapping in the Wadden Sea and reduced sediment inputs due to river damming, deepening of harbor channels and coastal protection. However, we stress that our data do not allow for a quantitative analysis of the major driving factors behind the temporal variability of sediment cycling. Hence, we recommend combining our results with information on the provenance of the Skagerrak deposits and integrating the Skagerrak data into larger-scale physical models that consider non-steady state particle transport in the North Sea.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"286 ","pages":"Article 105411"},"PeriodicalIF":2.1,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143136419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Fatty acid profiling in the invasive brown seaweed Rugulopterix okamurae: A usefulness taxonomical tool
IF 2.1 3区 地球科学
Continental Shelf Research Pub Date : 2025-01-21 DOI: 10.1016/j.csr.2025.105412
José L. Guil-Guerrero , M. Carmona-Fernández , Tarik Chileh-Chelh , El-Hassan Belarbi , M. Urrestarazu , T.P. Loeiro Cunha-Chiamolera , M. Ezzaitouni , Miguel Á. Rincón-Cervera , Ignacio Rodríguez-García
{"title":"Fatty acid profiling in the invasive brown seaweed Rugulopterix okamurae: A usefulness taxonomical tool","authors":"José L. Guil-Guerrero ,&nbsp;M. Carmona-Fernández ,&nbsp;Tarik Chileh-Chelh ,&nbsp;El-Hassan Belarbi ,&nbsp;M. Urrestarazu ,&nbsp;T.P. Loeiro Cunha-Chiamolera ,&nbsp;M. Ezzaitouni ,&nbsp;Miguel Á. Rincón-Cervera ,&nbsp;Ignacio Rodríguez-García","doi":"10.1016/j.csr.2025.105412","DOIUrl":"10.1016/j.csr.2025.105412","url":null,"abstract":"<div><div><em>Rugulopterix okamurae</em> is a macroalga native to the northwestern Pacific and recently found in Southeast (SE) Spain. This macroalga poses a serious threat because of its strong capacity to alter the community structure of marine ecosystems. This species is difficult to distinguish from native elements such as <em>Dictyota</em> spp.; thus, a simple tool for identifying these algae will be welcome. In this work, the fatty acid (FA) composition of <em>R. okamurae</em> and <em>Dictyota</em> spp. samples from several locations were determined and discussed from a chemotaxonomic point of view. In <em>R. okamurae</em> highlights palmitic, oleic, and arachidonic (ARA) acids, while in <em>D. dichotoma</em> eicosapentaenoic acid and ARA reached higher values than in <em>R. okamurae</em>. Further, Agglomerative Hierarchical Clustering analysis performed for selected FA ratios segregated <em>R. okamurae</em> from any <em>Dictyota</em> species, especially due to ARA + EPA proportions, thus FA profiling constitutes a valid chemotaxonomic tool for rapid identification of <em>R. okamurae</em>.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"286 ","pages":"Article 105412"},"PeriodicalIF":2.1,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143136421","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
Biochemical implications of the Bottom Boundary Layer Detachment at the Mid-Atlantic Bight shelf-break front
IF 2.1 3区 地球科学
Continental Shelf Research Pub Date : 2025-01-21 DOI: 10.1016/j.csr.2025.105408
Serena Negroni , Dennis J. McGillicuddy Jr. , Glen G. Gawarkiewicz , Paolo Oddo , Nadia Pinardi
{"title":"Biochemical implications of the Bottom Boundary Layer Detachment at the Mid-Atlantic Bight shelf-break front","authors":"Serena Negroni ,&nbsp;Dennis J. McGillicuddy Jr. ,&nbsp;Glen G. Gawarkiewicz ,&nbsp;Paolo Oddo ,&nbsp;Nadia Pinardi","doi":"10.1016/j.csr.2025.105408","DOIUrl":"10.1016/j.csr.2025.105408","url":null,"abstract":"<div><div>The Mid-Atlantic Bight frontal system along the U.S. northeast shelf is rich in biodiversity. In this region, primary production is influenced by a variety of upwelling processes, including internal instabilities of the front, off-shore forcing from Gulf Stream rings, and wind-driven flows. It is noteworthy that the concentrations of chlorophyll-<em>a</em> (Chl-<em>a</em>) in the shelf-break region are not consistently enhanced throughout the year, although local increases of phytoplankton biomass have been observed in some circumstances. In this work, we investigate the frontal dynamics of one of the possible mechanisms affecting primary production: upwelling via detachment of the Bottom Boundary Layer (BBL). The annual variability of the surface Chl-<em>a</em> in the shelf-break region reveals a 5- to 20-day period, which is potentially consistent with nutrient upwelling associated with the BBL detachment. Details of the process are examined using <em>in situ</em> data by quantifying along-isopycnal changes in properties. As frontal isopycnals rise in the water column, nitrate tends to decrease and Chl-<em>a</em> tends to increase, suggesting utilization of upwelled nutrients by phytoplankton. However, significant fluctuations can be attributed to sample size, intrinsic data variability, and the assumption of homogeneity in the along-shelf dimension.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"286 ","pages":"Article 105408"},"PeriodicalIF":2.1,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Experimental warming effects on microbial community growth and mortality during the cold season in coastal waters of Taiwan and Japan
IF 2.1 3区 地球科学
Continental Shelf Research Pub Date : 2025-01-19 DOI: 10.1016/j.csr.2025.105407
Madeline Olivia , Patrichka Wei-Yi Chen , Pei-Chi Ho , Vladimir Mukhanov , An-Yi Tsai
{"title":"Experimental warming effects on microbial community growth and mortality during the cold season in coastal waters of Taiwan and Japan","authors":"Madeline Olivia ,&nbsp;Patrichka Wei-Yi Chen ,&nbsp;Pei-Chi Ho ,&nbsp;Vladimir Mukhanov ,&nbsp;An-Yi Tsai","doi":"10.1016/j.csr.2025.105407","DOIUrl":"10.1016/j.csr.2025.105407","url":null,"abstract":"<div><div>We conducted three <em>in situ</em> microcosm experiments in Taiwan and Japan during the winter of 2023 to investigate microbial plankton community responses to warming in Pacific coastal waters. Monitoring and analyzing microbial communities, including viruses, bacteria, and picophytoplankton (<em>Synechococcus</em> spp., <em>Prochlorococcus</em> spp., and picoeukaryotes), were performed by flow cytometry over seven consecutive days. Control microcosms were maintained at ambient coastal water temperature, while experimental microcosms were warmed by + 2–3°C. The modified dilution method estimated picoplankton (heterotrophic bacteria and picophytoplankton) growth, grazing, and viral lysis rates on days two and five. Our time-series incubation experiments revealed that warming did not increase bacterial abundance, but viral abundance significantly increased with temperature, indicating a strong lytic impact on bacteria. Moreover, the relative increase in viral abundance was related to a rise in <em>Synechococcus</em> spp. abundance under warming conditions across all study sites, relative to ambient conditions. Similar trends were observed in nanoflagellate abundance between the two treatments across all stations. In modified dilution experiments, viral lysis accounted for up to 51% of picoplankton mortality, compared to total mortality, indicating that viral lysis was the primary driver of picoplankton mortality under warmed conditions. These findings highlight the critical role of viruses in cold marine environments and suggest the potential for modeling viral functions to predict the effects of global warming on microbial dynamics.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"286 ","pages":"Article 105407"},"PeriodicalIF":2.1,"publicationDate":"2025-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143136306","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
Circulation in Cross Sound, Alaska
IF 2.1 3区 地球科学
Continental Shelf Research Pub Date : 2025-01-18 DOI: 10.1016/j.csr.2025.105409
Emily Lemagie , Christopher Paternostro , Phyllis J. Stabeno , Mark Zimmermann
{"title":"Circulation in Cross Sound, Alaska","authors":"Emily Lemagie ,&nbsp;Christopher Paternostro ,&nbsp;Phyllis J. Stabeno ,&nbsp;Mark Zimmermann","doi":"10.1016/j.csr.2025.105409","DOIUrl":"10.1016/j.csr.2025.105409","url":null,"abstract":"<div><div>Cross Sound is located in southeast Alaska's Alexander Archipelago and extends ∼50 km eastward from the Gulf of Alaska to Icy Strait. Between May and August 2010, ten moorings were deployed at the entrances to Cross Sound and at key internal locations within the Sound. Instruments on each mooring measured current velocity and temperature; some also measured salinity. The tidal range in this region is large (&gt;5 m), causing high current speeds (peak speed measured at 263 cm s<sup>−1</sup>), with a strong fortnightly signal. The flow predominantly follows the bathymetry westward from Icy Strait through Cross Sound and into the Gulf of Alaska. Moorings captured an estuarine exchange with outflow near the surface and inflow at depth. Earlier multi-year moorings demonstrated that synoptic variability in water properties is greater in spring and fall than over the summer season. In summer, during spring tides, the water column can mix to the bottom, delivering nutrients into the surface euphotic zone. When spring tides coincided with a strong wind event, bottom temperatures increased by &gt; 1 °C over 3 days.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"286 ","pages":"Article 105409"},"PeriodicalIF":2.1,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135941","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
Effects of consecutive dredging on the fish community of a tropical estuary
IF 2.1 3区 地球科学
Continental Shelf Research Pub Date : 2025-01-15 DOI: 10.1016/j.csr.2025.105402
Guillermo Duque , Diego Esteban Gamboa-García , Andrés Molina , Pilar Cogua
{"title":"Effects of consecutive dredging on the fish community of a tropical estuary","authors":"Guillermo Duque ,&nbsp;Diego Esteban Gamboa-García ,&nbsp;Andrés Molina ,&nbsp;Pilar Cogua","doi":"10.1016/j.csr.2025.105402","DOIUrl":"10.1016/j.csr.2025.105402","url":null,"abstract":"<div><div>Dredging is a human activity that significantly alters aquatic habitats, potentially impacting ecosystem services such as artisanal fishing. This study aimed to evaluate changes in fish density in Buenaventura Bay in response to three dredging events that occurred between 2015 and 2021. Fish monitoring was conducted using artisanal trawl nets before, during, and after each dredging event, with annual sampling in two areas of the bay over the study period. The findings revealed species-specific responses: while species such as the catfish <em>Cathorops multiradiatus</em> and the sole <em>Achirus kluzingeri</em> benefited from dredging, the pygmy pufferfish <em>Sphoeroides trichocephalus</em> was negatively affected. Contrary to common assumptions in the literature, resident estuarine species were not necessarily the most negatively impacted but instead exhibited variable responses to dredging disturbances. The fish assemblage showed a shift towards species more tolerant to these impacts, highlighting a potential loss of ecosystem resilience. These changes could have long-term implications for the productivity of artisanal fisheries and the food security of local fishing communities.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"286 ","pages":"Article 105402"},"PeriodicalIF":2.1,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143136420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Bottom depth carving the pelagic spatial organisation in large marine ecosystem: The case of North West Africa 大型海洋生态系统中上层空间组织的底部深度雕刻:以西北非洲为例
IF 2.1 3区 地球科学
Continental Shelf Research Pub Date : 2024-11-27 DOI: 10.1016/j.csr.2024.105372
Anne Mouget , Patrice Brehmer , Mohamed Ahmed Jeyid , Yannick Perrot , Ndague Diogoul , Momodou Sidibeh , Kamel Mamza , Anthony Acou , Abdoulaye Sarré
{"title":"Bottom depth carving the pelagic spatial organisation in large marine ecosystem: The case of North West Africa","authors":"Anne Mouget ,&nbsp;Patrice Brehmer ,&nbsp;Mohamed Ahmed Jeyid ,&nbsp;Yannick Perrot ,&nbsp;Ndague Diogoul ,&nbsp;Momodou Sidibeh ,&nbsp;Kamel Mamza ,&nbsp;Anthony Acou ,&nbsp;Abdoulaye Sarré","doi":"10.1016/j.csr.2024.105372","DOIUrl":"10.1016/j.csr.2024.105372","url":null,"abstract":"<div><div>This study aimed to examine the spatial organization of pelagic communities within the water column along a horizontal gradient extending from the coast to the offshore area, categorized into three zones: inshore, offshore, and transition. Using fisheries acoustics, a total of 29 000 nautical miles of acoustic transects collected during 14 annual standardized surveys were analyzed using two complementary acoustic methods: (i) extraction of sound scattering layers (SSL) and (ii) echointegration (EI) across the entire water column, both horizontally and vertically averaged. The results revealed significant differences between the three bathymetric areas based on SSL and EI descriptors, with micro-nektonic communities in the transition area exhibiting intermediate characteristics between those in the inshore and offshore areas. The relative abundance of micro-nektonic communities decreased from shallow coastal areas to deep offshore areas, with a mean S<sub>v</sub> from echointegration of −66.43, −74.39 and −73.65 dB for inshore, transition and offshore, respectively. The inshore area is different from the transition and offshore areas, which is confirmed by diel vertical migration (DVM) analyze through vertical profiles. All areas exhibited classic DVM type I; however, offshore and transition areas also presented unexpected DVMs of type II, <em>i.e.</em>, organisms descend deeper during the night, displaying distinct vertical profiles compared to the inshore area. This suggests that the functional and specific composition of pelagic micro-nektonic communities differed between inshore and offshore areas, indicating that organisms adjust their responses to their environment. Over two decades, the three bathymetric areas showed a significant increase in pelagic relative biomass and variation in SSL spatial structure. The number of SSLs significantly increase, from 0.97 to 1.05 inshore, from 1.75 to 2.25 in the transition area and from 2.2 to 2.7 offshore. Nevertheless, micro-nektonic communities reacted differently to interannual changes depending on the bathymetric areas, such as the minimal depth of the shallowest SSL. Fluctuations in SSL descriptors were highlighted over the study period, which may be related to multi-decadal oscillations in the Atlantic Ocean.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"285 ","pages":"Article 105372"},"PeriodicalIF":2.1,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142757064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Environmental control of Arctic marine zooplankton near a large archipelago during the summer season 夏季大型群岛附近北极海洋浮游动物的环境控制
IF 2.1 3区 地球科学
Continental Shelf Research Pub Date : 2024-11-23 DOI: 10.1016/j.csr.2024.105363
Vladimir G. Dvoretsky, Denis V. Moiseev, Marina P. Venger, Anastasya V. Vashchenko, Veronika V. Vodopianova
{"title":"Environmental control of Arctic marine zooplankton near a large archipelago during the summer season","authors":"Vladimir G. Dvoretsky,&nbsp;Denis V. Moiseev,&nbsp;Marina P. Venger,&nbsp;Anastasya V. Vashchenko,&nbsp;Veronika V. Vodopianova","doi":"10.1016/j.csr.2024.105363","DOIUrl":"10.1016/j.csr.2024.105363","url":null,"abstract":"<div><div>In order to assess the impact of environmental conditions on marine zooplankton, we conducted a survey around Novaya Zemlya (NZ), a large archipelago located within the Arctic Ocean, during the summertime of 2022. Observations were made by employing net hauls that spanned the entire water column. Through the use of cluster analysis, we ascertained the existence of two unique assemblages inhabiting the Barents and Kara seas. The highest zooplankton abundance, biomass, and diversity were observed at the intersection of the warm Atlantic Water and the comparatively colder Barents Sea Water along the western coast of NZ. Copepods were the predominant species within the zooplankton population in both regions, registering similar numbers, while other groups were noticeably more numerous in the Barents Sea. The distribution of different plankton groups predominantly correlated with the current systems encircling NZ. The inshore waters proximate to the eastern segment of NZ were influenced by the presence of cold currents, while the western part was subjected to the effects of warmer currents. A strong association was observed between zooplankton and microbial variables, such as the abundance and biomass of prokaryoto- and virioplankton. Redundancy analysis indicated close interactions within the plankton ecosystems of the region. These findings may be valuable for assessing the potential impacts of recent climatic perturbations in the Arctic and establishing a baseline for studying Arctic plankton communities in coastal ecosystems.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"284 ","pages":"Article 105363"},"PeriodicalIF":2.1,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142724145","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
Multiscale sea level variability on the western Bay of Bengal: A study using tide gauge and satellite observations 孟加拉湾西部的多尺度海平面变化:利用验潮仪和卫星观测数据进行的研究
IF 2.1 3区 地球科学
Continental Shelf Research Pub Date : 2024-11-16 DOI: 10.1016/j.csr.2024.105361
Arkaprava Ray , Sourav Sil , Samiran Mandal
{"title":"Multiscale sea level variability on the western Bay of Bengal: A study using tide gauge and satellite observations","authors":"Arkaprava Ray ,&nbsp;Sourav Sil ,&nbsp;Samiran Mandal","doi":"10.1016/j.csr.2024.105361","DOIUrl":"10.1016/j.csr.2024.105361","url":null,"abstract":"<div><div>The study examines the tidal variability and intraseasonal oscillations (ISOs) of sea level using tide gauge observations collected during the year 2014 at four stations: Gardenreach, Paradeep, Kakinada, and Ennore along the western Bay of Bengal (BoB). In the first part, the tidal analysis of sea level data shows the dominance of M2 tides followed by S2, N2, K1, and O1 at all the stations. The tides are usually semidiurnal in nature over BoB, represented through the form factor, which is maximum over Ennore (0.21) and minimum over Gardenreach (0.10). The tidal amplitudes increase gradually northward along the western BoB due to interaction with the shallow continental shelf. The topography and coastal geometry also impact the shallow-water constituents (M4 and MS4) significantly at all the locations. Another noteworthy finding is the higher amplitude of M2 tide during the post-monsoon seasons because of the higher stratification of the water column. In the second part, the presence of different non-tidal signals from the residual sea level and altimetry gridded data are studied as well. The correlation coefficient between Sea Level Anomaly (SLA) data from altimetry and the Tide Gauge data are as high as 0.94, 0.91, and 0.90 at Paradeep, Kakinada and Ennore, respectively. The spectral analysis ensures the dominance of the signals with periodicity of 20–60 days in the BoB, which is probably caused due to the monsoon ISOs and Madden Julian Oscillations. The 10–20 days oscillations are also observed with significant amplitudes primarily at Gardenreach which attributes to the Quasi-Biweekly Oscillations. The signature of seasonally varying coastally trapped Kelvin Waves is also identified on the western BoB from both the satellite and Tide Gauge data. The strength of the intraseasonal variability significantly increases during negative Indian Ocean Dipole years with respect to the positive years. The study identified the usefulness of the sea level observation to monitor the multiscale variation within the tides to the interannual scales along the Indian coast.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"284 ","pages":"Article 105361"},"PeriodicalIF":2.1,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142724133","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-based evidence of upwelling separation off NW Iberia 伊比利亚西北部近海上升流分离的卫星证据
IF 2.1 3区 地球科学
Continental Shelf Research Pub Date : 2024-11-15 DOI: 10.1016/j.csr.2024.105356
Pedro R. Nunes , Vanda Brotas , Rita Nolasco , Jesus Dubert , Paulo B. Oliveira
{"title":"Satellite-based evidence of upwelling separation off NW Iberia","authors":"Pedro R. Nunes ,&nbsp;Vanda Brotas ,&nbsp;Rita Nolasco ,&nbsp;Jesus Dubert ,&nbsp;Paulo B. Oliveira","doi":"10.1016/j.csr.2024.105356","DOIUrl":"10.1016/j.csr.2024.105356","url":null,"abstract":"<div><div>A high-resolution image sequence of sea surface temperature (SST) and Chlorophyll-a (Chl-<em>a</em>), together with numerical model solutions, is used to study the spatio-temporal variability of the two variables under intermittent upwelling-favourable winds. It is shown that the evolution of the cross-shore SST and Chl-<em>a</em> profiles over the shelf is linked to the intensity, duration and temporal separation between the wind events. The model's realistic representation of the cross-shore SST supports the interpretation that the observed variability is governed, in the inner-shelf, by the offshore separation of upwelling divergence and, over the mid-shelf, by offshore Ekman transport and mesoscale circulation. The observation of an alongshore low SST/low Chl-<em>a</em> band, bounded by the 30 m and 50 m isobaths, for the days of maximum wind stress, matching the model's solution for the outcrop of colder subsurface waters, constitute a satellite-based evidence of upwelling separation from the coast. The results are in close agreement with previous works on upwelling in shallow waters, straight coastline and gentle slope, but were not yet reported in the study area off NW Portugal. This evidence prompts for the need to use high-resolution (&lt;1 km) numerical models/imagery to properly assess the inner-shelf circulation in the region, and the effects on the marine ecosystem, namely the offshore transport of marine organisms or pollutants.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"284 ","pages":"Article 105356"},"PeriodicalIF":2.1,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142724144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
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