Continental Shelf Research最新文献

{"title":"Surface eddy kinetic energy variability of the Western North Atlantic slope sea 1993–2016","authors":"James J. Bisagni ,&nbsp;Dujuan Kang ,&nbsp;Andrew C. Thomas ,&nbsp;Andre Schmidt","doi":"10.1016/j.csr.2024.105200","DOIUrl":"https://doi.org/10.1016/j.csr.2024.105200","url":null,"abstract":"<div><p>The Slope Sea is the dynamic ocean region located between the United States and Canadian northeast continental shelves and the northeastward flowing Gulf Stream (GS) located farther offshore. Here we define it as located between the 200-m isobath and the monthly GS sea surface temperature (SST) front from −75° to −55° E. Monthly mean near-surface eddy kinetic energy (EKE) was computed for the Slope Sea using surface geostrophic current anomalies derived from gridded 1993–2016 Copernicus Marine Environment Monitoring Service (CMEMS) sea height anomalies. Long-term, monthly mean Slope Sea EKE anomalies show a robust seasonal cycle with a winter (February) minimum and summer (June) maximum. This agrees with both seasonally-varying density stratification and dissipation and also the seasonal variation in the formation of GS WCRs within the Slope Sea. The RMS of the Slope Sea EKE seasonal cycle generally increased after 2002 by a factor of up to ∼2 relative to prior years. The seasonal cycle of Slope Sea EKE displayed higher EKE in the vicinity of the New England Seamount Chain (NESC) that extends towards the shelf break front from approximately −67° E to −63° E. Interannual variability of annual mean near-surface EKE from individual digitized GS warm core ring (WCR) observations from a Bedford Institute of Oceanography (BIO) WCR database is highly correlated with Slope Sea EKE. However, interannual variability of annual mean near-surface EKE computed from a census of all newly formed WCRs displayed only a weak correlation. Many of the WCRs from both the BIO and WCR census displayed anomalously low EKE values and were observed within the northern Slope Sea away from the GS. Some were located inshore of the position of the climatological mean shelf break front. WCRs with higher EKE were located throughout the Slope Sea, with higher numbers in the vicinity of the NESC. The many observations of the less energetic features located close to or inshore of the mean shelf break front suggest they are important to cross-shelf fluxes of heat, salt, nutrients, shelf biota. They therefore likely impact the shelf ecosystem, similar to the more energetic and typical WCRs impacting the outer shelf as discussed by earlier workers.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140181249","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}

{"title":"Factors influencing the intensity of cross-front transport: An example from the offshore transport around the Shandong Peninsula, China","authors":"Xiaomei Xu ,&nbsp;Yong Shi ,&nbsp;Charlie Thompson ,&nbsp;Jixuan Lyu ,&nbsp;Shuo Zhang ,&nbsp;Shengjing Liu ,&nbsp;Guang Yang ,&nbsp;Tao Liu ,&nbsp;Jianhua Gao","doi":"10.1016/j.csr.2024.105201","DOIUrl":"10.1016/j.csr.2024.105201","url":null,"abstract":"<div><p>Cross-front transport is a vital process in the offshore transport of terrestrial materials. The factors influencing cross-front transport are multifaceted and exhibit regional variability. As important factors regulating material transport patterns in the shelf seas of eastern China, the East Asian Winter Monsoon (EAWM) and Kuroshio current (including its branches) vary on multiple time scales, yet their role in controlling offshore transport is not fully understood. In this paper, cross-front offshore transport in the North Yellow Sea is chosen to investigate the aforementioned issue using numerical simulation. By excluding other potential processes for offshore transport, frontal instability is identified as the primary mechanism for offshore transport, which is triggered by winter storms (bursts of the EAWM); hence, the intensity of offshore transport is highly associated with the strength of winter storms on synoptic scales. However, on the inter-annual scale, the intensity of offshore transport is more likely regulated by the strength of the Kuroshio current, and a warming Kuroshio facilitates offshore transport. Although the role of each factor in controlling the intensity of offshore transport is delineated, the interactive effects of the EAWM and Kuroshio current on offshore transport are quite intricate, and how to quantitatively estimate their roles on multiple time scales remains a challenge using modelling. The results obtained from this study can be applied to analyse cross-front transport throughout the eastern China seas and bear significant implications for future studies on pollutant diffusion, nutrient distribution, and sediment transport in the coastal area.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140156331","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}

{"title":"Model of Pleistocene geomorphological evolution in active Alpine neotectonics controlled margins in the western Mediterranean area: The case of SE Iberian Peninsula","authors":"Trinidad Torres ,&nbsp;José E. Ortiz ,&nbsp;Rosa Mediavilla ,&nbsp;Juan I. Santisteban ,&nbsp;Ana Blázquez ,&nbsp;Francisco J. Sierro ,&nbsp;Yolanda Sánchez-Palencia ,&nbsp;Ignacio López Cilla ,&nbsp;Rogelio de la Vega","doi":"10.1016/j.csr.2024.105198","DOIUrl":"https://doi.org/10.1016/j.csr.2024.105198","url":null,"abstract":"<div><p>At the northern tip of the Betic realm (SE Iberian Peninsula), some troughs (synclines) and elevations (anticlines) alternate, marking the present-day coastal lobed morphology of cape-bounded bays, where subsidence and uplift conditions prevailed, respectively. In this study, we were able to establish a clear coastal evolution. To this end, we considered the sedimentological and palaeoenvironmental conditions, the palaeogeographical reconstruction, and recent tectonics until Middle Pleistocene times (MIS 5) through the interpretation of onshore cores, raised marine deposits and geophysical profiles. In this regard, as reflected by both onshore and offshore information, there seems to be a stratigraphical gap from the end of the Pliocene to MIS 15 (Middle Pleistocene). In areas under uplift conditions, linked to tardive Alpine tectonics, the deposits of ancient shorelines and raised beaches were located at different post-depositional elevations, which were dated from odd MIS 15 to MIS 5 using amino acid racemization. Only deposits aged MIS 7 and MIS 5 are roughly at the present-day sea level or some meters above. In the troughs, which remain mostly as lagoons and salt marshes, subsidence did not allow the sedimentary record to be discerned. However, many borehole cores were recovered, attesting lagoonal, marsh, sabkha, or alluvial environmental conditions, which were usually unconnected from the sea. Micropaleontological and amino acid racemization dating revealed these cores to be of MIS15 to MIS5 age. Offshore seismic research revealed five erosive-bounded deposits that are stacked accretionary prisms corresponding to highstands between odd MIS 15 and MIS 5. In contrast, even MISs can be correlated to the erosive horizons that separated the seismic units, reflecting lowstands. In this regard, some bars, at a range of distances from the present-day coastline, protected wetlands from marine influence, allowing the development of diverse sub-environments under changing paleogeographical and paleoclimatological conditions.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0278434324000281/pdfft?md5=9135351a7bc21f60cd4718db14b2da3a&pid=1-s2.0-S0278434324000281-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140141541","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}

{"title":"Hydromorphology of the southern Baltic coastal and transitional waters – New index-based assessment method","authors":"Tamara Zalewska, Michal Iwaniak, Wojciech Kraśniewski, Patryk Sapiega, Beata Danowska, Michał Saniewski, Marta Rybka-Murat, Agnieszka Grajewska, Kamil Wawryniuk","doi":"10.1016/j.csr.2024.105195","DOIUrl":"https://doi.org/10.1016/j.csr.2024.105195","url":null,"abstract":"The research aimed to develop the complete method for the classification of the hydromorphological status of transitional and coastal water bodies in the southern Baltic region with its adaptation to the current legislation and marine management requirements. The method considers impact and pressure indicators, such as infrastructure and activities carried out in coastal and marine areas, which may affect the change of hydromorphological status and habitat conditions. The methodology covers the change in hydrodynamic conditions, such as the wave regime, sea currents, freshwater inflow, and morphological changes defined by the dominant sediment fraction. The methodology is based on the seven indicators. Administrative, measurement and reanalysis data were used for their classification. The indicators scores were used for the hydromorphological quality index (HQI) calculation. Based on data from 2022, the classification of hydromorphological status showed good status in seven and moderate status in four water bodies.","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140075024","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}

{"title":"Transverse variability of residual currents, sediment fluxes, and bed level changes in estuaries with an estuarine dam: Role of estuarine type, dam location, and discharge interval","authors":"Steven M. Figueroa,&nbsp;Minwoo Son","doi":"10.1016/j.csr.2024.105196","DOIUrl":"https://doi.org/10.1016/j.csr.2024.105196","url":null,"abstract":"<div><p>Estuarine dams are constructed in estuaries for reasons such as freshwater, flood control, and navigation. By changing tidal and river properties, estuarine dams can change the circulation and sediment transport in estuaries. Previous studies have investigated the along-channel changes in flow and sediment transport, however across-channel changes due to an estuarine dam are not well understood. To increase our understanding, this study analyzed an idealized estuary using the COAWST numerical modeling system. Models of strongly stratified, partially mixed, periodically stratified, and well-mixed estuaries were run for one year. Then, the models were subject to the construction of an estuarine dam and run for another year. For each estuarine type, scenarios with an estuarine dam at <em>x</em> = 20, 55, and 90 km from the mouth and freshwater discharge intervals of <em>Δt</em> = 0.5, 3, and 7 days were investigated, and the scenarios were compared. The results indicated that the river-dominated and tide-dominated estuaries behaved differently. In river-dominated estuaries, the residual circulation tended to be inflow in the channel and outflow over the shoals due to the estuarine exchange flow, and the secondary circulation was bottom divergent due to differential advection. The exchange flow and secondary circulation were found to weaken with longer discharge interval. The sediment fluxes in the channel were dominant, and, despite the weaker exchange flow, were found to be greater and directed seaward due to strong dam discharge for long discharge intervals. In tide-dominated estuaries, the residual circulation tended to be inflow over the shoals and outflow in the channel due to the tide-induced circulation, and the secondary flow was bottom convergent due to differential advection resulting from Stokes return flow. As the estuarine dam was located nearer to the mouth, the tide-induced circulation was replaced with exchange flow, and the secondary flow became bottom divergent. The sediment fluxes in the channel were dominant in this case as well, and were determined by tidal asymmetry from the interaction of the tides with the residual current, becoming directed landward as the seaward tide-induced circulation decreased with the estuarine dam near the mouth. With respect to bed level change, gradients in along-channel sediment fluxes were found to contribute most to bed level change near the mouth and estuarine dam, whereas gradients in across-channel sediment fluxes contributed most to deposition on the estuarine shoals. This study demonstrates that estuarine dam location and discharge interval can alter estuarine transverse variability and improves our understanding compared to previous analyses based solely on along-channel processes.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140134133","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}

{"title":"Contribution of offshore platforms and surrounding habitats to fish production in the Bass Strait, south-east Australia","authors":"Matthew Birt ,&nbsp;Dianne L. McLean ,&nbsp;Mark Case ,&nbsp;Samantha Jaworski ,&nbsp;Conrad W. Speed ,&nbsp;Daniel Pygas ,&nbsp;Damon Driessen ,&nbsp;Laura Fullwood ,&nbsp;Euan Harvey ,&nbsp;Brigit Vaughan ,&nbsp;Peter I. Macreadie ,&nbsp;Jeremy T. Claisse","doi":"10.1016/j.csr.2024.105209","DOIUrl":"10.1016/j.csr.2024.105209","url":null,"abstract":"<div><p>Information on the contribution of offshore oil and gas (O&amp;G) platforms to fish productivity is required to contribute to the decision-making process to remove, partially remove, or retain these structures during decommissioning after petroleum production ceases. The present study assesses the biomass and fish production of one common and abundant fish species (<em>Caesioperca lepidoptera –</em> butterfly perch) and two commercially fished species (<em>Helicolenus percoides –</em> reef ocean perch; <em>Nemadactylus macropterus –</em> jackass morwong) on eight O&amp;G platforms and in surrounding natural habitats in the Bass Strait, south-east Australia, where options for decommissioning are being assessed. High-definition stereo-video imagery was collected by remotely operated vehicle (ROV) from eight platform facilities, their immediate benthic surrounds, reference areas reflective of the likely pre-installation seabed state (sand-dominated) and a nearby natural ‘reef’ area referred to as south-east reef (some limestone foundation). The biomass of all three species was low in the benthic surrounds of platforms, at reference locations and at south-east reef where minimal cover by benthic organisms was recorded and, as such, there was little to no fish production for the three study species in these areas. We observed a total fish biomass of 2.85 tonnes across the eight platforms for the three fish species surveyed, with high variability across platforms. Total production (P) across all platforms was estimated at 1244 kg/year for the three species, with a mean fish production density of 82 g/m²/year. Approximately 79% of total production is considered ‘new’ production (984 kg/year i.e., the production attributed to the presence of the platforms; with a mean production density of 64 g/m²/year). The remaining 21% could be retained or redistributed into the surrounding area if platforms were removed. <em>C. lepidoptera</em> accounted for the majority (90%) of biomass and of total production for all three species across all locations surveyed. Despite only accounting for a small proportion of platform surface area, the bottom 5 m sections of platforms had 41% of the total biomass observed and accounted for 46% of total production of these three study species. Production measures for platforms surveyed here are relatively high compared to other artificial reefs and habitats around the world. Total removal of these platforms will likely result in a reduction of fish biomass and fish productivity (incl. several fishery species) in the immediate vicinity.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0278434324000396/pdfft?md5=4746cb19bda5e596bb56957cf3b8bf99&pid=1-s2.0-S0278434324000396-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140150886","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}

{"title":"Impacts of Agulhas Current meanders on intermediate water masses along the adjacent continental slope and shelf.","authors":"T. Lamont ,&nbsp;I. Halo ,&nbsp;C.S. Russo","doi":"10.1016/j.csr.2024.105197","DOIUrl":"10.1016/j.csr.2024.105197","url":null,"abstract":"<div><p>Variability in the Agulhas Current system is dominated by meanders, which constitute cyclonic eddies along the inshore edge of the Current on the southeast coast of South Africa. Few studies have investigated the influence of these meanders on hydrographic variability on the adjacent shelf and slope and to date only a handful have been sampled <em>in situ</em>. This study used available <em>in situ</em> data and GLORYS12v1 model output to investigate the impact of meanders on the distribution of Intermediate waters, namely Red Sea Water (RSW) and Antarctic Intermediate Water (AAIW), as well as mechanisms driving these variations. We focussed on four eddies, sampled <em>in situ</em> during July 1998, April 2010, January–February 2017, and July–August 2017. RSW dominated along the inshore edge of the Agulhas Current in the absence of meanders, but larger proportions of AAIW occurred in the presence of cyclonic eddies. During eddy events, the kinematic steering level was raised above the lower boundary of Intermediate waters, increasing cross-frontal mixing of waters at depths of 800–1800 m. Eddy-induced upwelling of Central and Intermediate waters onto the shelf appeared to be inhibited by bands of strong positive relative vorticity (&gt;0.4 × 10⁻⁴ s⁻¹), which likely promoted downwelling conditions inshore of the July 1998, April 2010, and July–August 2017 eddies. Weak positive relative vorticity (&lt;0.2 × 10⁻⁴ s⁻¹) inshore of the January–February 2017 eddy was associated with enhanced water mass exchange between the shelf and deeper (&gt;1000 m) ocean. GLORYS12v1 was consistently comparable with satellite and <em>in situ</em> data, and simulated the overall distribution of water masses on the continental shelf and slope despite its inability to reflect the influence of river discharge in nearshore regions during austral summer. The model is thus suitable to investigate the influence of Agulhas Current meanders on the hydrography of South Africa's southeast coast.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140075026","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}

{"title":"Lipid biomarker evidences of natural and anthropogenic organic matter inputs in sediments from the eastern Sunda Shelf in the southern South China Sea","authors":"Jing Zhao ,&nbsp;Li Zhang ,&nbsp;Yongdong Zhang ,&nbsp;Qiuhua Yu ,&nbsp;Shuaibing Luo","doi":"10.1016/j.csr.2024.105184","DOIUrl":"https://doi.org/10.1016/j.csr.2024.105184","url":null,"abstract":"<div><p>Understanding the exact origin of sedimentary organic matter (OM) was crucial for assessing carbon cycle processes and environmental contamination in continental margin. However, such studies are less performed on shelves far away from the mainland. Here, the abundance and composition of lipid biomarkers were determined in surface sediments from 58 sites at the eastern Sunda Shelf, South China Sea, to identify the sedimentary OM sources and characterize the spatial variation of OM input from specific sources. The results indicated that the sedimentary OM were derived mainly from algae, bacteria, seagrass, terrestrial plants, mangroves, petroleum, and rock erosion products, and the relative significance of these sources varied between different sites. Algal OM input, as indicated by the abundances of short-chain <em>n</em>-alkanes, cholest-2-ene, dinosterol, brassicasterol, and C₃₀ 1,15 alkyl diol, was relatively high at five sites (ZW 47, 51, 55, 82, and 86). Conversely, long-chain <em>n</em>-alkane and long-chain <em>n</em>-alkanol proxies suggested terrestrial plant input was most predominant at three other sites (ZW68, 103, and 106), and high abundances of taraxerol and β-amyrin in these sites imply the dominance of mangrove vegetation in the terrestrial OM. UCM (unresolved complex mixture) and αβ-hopanes indicated a relatively high input of petroleum-derived OM at another five sites (ZW3, 8, 25, 51, and 97). The analysis of abundance variations in the biomarkers suggested a substantial spatial heterogeneity in terrestrial plant OM input and a much lower heterogeneity in algal OM input, probably resulting from great variation in riverine transport intensity and relatively homogeneous water environment across the studied region. Correlation analysis indicated that both algal and terrestrial plant OM significantly contributed to the OM buried in the sediments. These results can form a basis for understanding the carbon cycle processes in Sunda Shelf. The finding of petroleum contamination in several sites can benefit for environmental protection and management of the shelf.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139714410","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}

{"title":"Seasonal variations in air-sea CO2 flux in the Bohai Sea and the temporal relationship between surface and bottom-water carbonate dynamics in a year","authors":"Hong-sheng Zhang ,&nbsp;Wei-dong Zhai ,&nbsp;Kai Tang","doi":"10.1016/j.csr.2024.105192","DOIUrl":"10.1016/j.csr.2024.105192","url":null,"abstract":"<div><p>The Bohai Sea is the only China seas lacking data-based estimation of annual air-sea CO₂ flux. To fill this gap, we investigated regional differences in the seasonal variation of surface fugacity of CO₂ (<em>ƒ</em>CO₂) and air-sea CO₂ fluxes in the Bohai Sea, based on mapping datasets collected from 15 carbonate-surveying cruises between 2011 and 2023. The results showed that air-sea CO₂ exchanges in the Bohai Sea are subject to both spatial and temporal variabilities. To sum up, the Bohai Sea acts as a very weak net CO₂ sinking area with a net uptake rate of 0.05 mol m⁻² yr⁻¹ in the surveyed area. The seasonal variation in <em>ƒ</em>CO₂ can be attributed to spring/summer biological drawdown, summer/autumn vertical mixing, temperature variations, and air-sea re-equilibration. As a nutrient-rich ocean margin, the Bohai Sea experiences high primary production in its surface waters in spring, generating plenty of biogenic detritus and contributing to the oxygen shortage and acidification in the bottom waters in summer.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139678017","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}

{"title":"Impacts of tropical cyclones on wave and current regime in a shallow, microtidal bay","authors":"Jay Merrill ,&nbsp;Giulio Mariotti,&nbsp;Chunyan Li,&nbsp;Matthew Hiatt","doi":"10.1016/j.csr.2024.105182","DOIUrl":"10.1016/j.csr.2024.105182","url":null,"abstract":"<div><p><span>In shallow, microtidal coastal regions storms play a significant role in influencing wave climate and circulation patterns. In the northern Gulf of Mexico<span><span>, understanding the effects of tropical cyclones<span> on hydrodynamic processes is crucial for making predictions in the face of rapid wetland loss and increasing human interventions via restoration and protection strategies, such as river diversions. In this study, two bottom-mounted upward-facing Acoustic Current Doppler Profilers and separate wave recorders were installed in Barataria Bay (Louisiana, USA) to measure waves and </span></span>current velocities responding to the passage of multiple tropical cyclones in fall 2020 and summer 2021. Analyses of depth-averaged current velocities suggest diurnal astronomic constituents drive currents over a 6-8 day period during and after storms, despite the microtidal nature of the bay. Wind-driven flow reversals of subtidal surface currents were observed during surge events. Storms that made landfall to the west of the bay resulted in enhanced subtidal current velocity magnitude during pre-and post-landfall periods while the one storm that made landfall to the east of the bay showed substantially less subtidal current response. Wave heights during storms are well reproduced by a semi-empirical model based on </span></span>wind speed<span>, fetch, and water depth, indicating that waves are locally generated. Tropical cyclones significantly influenced sub-tidal current velocities, depending on storm track and time of impact relative to the tidal cycle.</span></p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139555910","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}