Continental Shelf Research最新文献

{"title":"A numerical study on energy transfer between near-inertial internal waves and super-inertial internal waves in the South China sea under the influence of a typhoon","authors":"Shuqi Zhang ,&nbsp;Zhiwu Chen ,&nbsp;Haonan Wang ,&nbsp;Jiexin Xu ,&nbsp;Qian Zhang ,&nbsp;Yuhan Sun ,&nbsp;Yankun Gong ,&nbsp;Shuqun Cai","doi":"10.1016/j.csr.2024.105240","DOIUrl":"https://doi.org/10.1016/j.csr.2024.105240","url":null,"abstract":"<div><p>The energy transfer between near-inertial internal waves (NIWs) and super-inertial internal waves (SIWs) in the South China Sea (SCS) after the passage of Typhoon Son-tinh was investigated on the basis of a three-dimensional numerical model. Our model nicely reproduces the spectral peak (6.6 × 10⁻² m² s⁻² cpd⁻¹) within the near-inertial frequency band, which agrees well with that (6.5 × 10⁻² m² s⁻² cpd⁻¹) in the in-situ observations at the Xisha mooring. Model results demonstrate that the energy transfer rate from NIWs (0.8<em>f</em>∼1.8<em>f</em>) to SIWs (&gt;1.8<em>f</em>) within the mixed layer in the wake of typhoon Son-tinh is an order of magnitude larger than that during the typhoon-free period. Analogously, the super-inertial shear variance increases by nearly an order of magnitude as well. The increase in the energy of SIWs is mainly due to the energy cascade of NIWs through the nonlinear wave-wave interaction. The interaction between NIWs and SIWs was also revealed by the bicoherence spectrum. Compared with that on the left side of the typhoon track, the NIW kinetic energy on the right side is stronger, where the interaction between NIWs and SIWs is more intense. Several sensitivity experiments were designed to further investigate the effects of three typhoon parameters, namely the radius of maximum typhoon wind speed (<span><math><mrow><msub><mi>R</mi><mi>max</mi></msub></mrow></math></span>), the maximum typhoon wind speed (<span><math><mrow><msub><mi>V</mi><mi>max</mi></msub></mrow></math></span>) and the moving speed of typhoon (<span><math><mrow><msub><mi>U</mi><mi>m</mi></msub></mrow></math></span>), on the energy transfer rate (ETR) from NIWs to SIWs. It is shown that, the ETR increases linearly with <span><math><mrow><msub><mi>R</mi><mi>max</mi></msub></mrow></math></span>. Among three parameters, <span><math><mrow><msub><mi>V</mi><mi>max</mi></msub></mrow></math></span> has the strongest effects on the ETR which grows in power with increasing <span><math><mrow><msub><mi>V</mi><mi>max</mi></msub></mrow></math></span>. The ETR increases and then decreases with the enhancement of <span><math><mrow><msub><mi>U</mi><mi>m</mi></msub></mrow></math></span>, which gets maximum when <span><math><mrow><msub><mi>U</mi><mi>m</mi></msub></mrow></math></span> is about 6∼6.5 m/s. Overall, our results highlight the energy transfer between near-inertial internal waves and super-inertial internal waves under the influence of a typhoon.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140632586","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":"Extraction of ocean tides in the Bohai Sea from GFO satellite altimeter via a modified tidal harmonic analysis algorithm","authors":"Haidong Pan ,&nbsp;Junchuan Sun ,&nbsp;Tengfei Xu ,&nbsp;Zexun Wei","doi":"10.1016/j.csr.2024.105231","DOIUrl":"https://doi.org/10.1016/j.csr.2024.105231","url":null,"abstract":"<div><p>Exact tidal information is essential for multifarious human activities in the global ocean. Satellite altimeters especially Topex/Poseidon (T/P) and Jason series play fundamental roles in improving our understanding of global tides. Compared to T/P-Jason series, other satellite altimeters such as Geosat Follow-On (GFO) have been rarely used in tidal studies mainly due to their unfavorable aliasing features for tidal estimates. Classical harmonic analysis requires 12-year GFO records to fully resolve eight major tidal constituents while the longest GFO data is only 8-year. As a result, it is challenging for classical harmonic analysis to derive reliable tidal estimates from short GFO records. In this study, a modified tidal harmonic analysis algorithm based on the credo of smoothness (i.e. MHACS) is introduced to extract ocean tides from GFO records in the Bohai Sea. Via utilizing the inherent natural links between main constituents, MHACS breaks the constraint of the Rayleigh criterion and effectively solves tidal aliasing problems in GFO records. Practical experiments indicate that GFO-derived tidal constants via MHACS have high consistencies with the tidal theory and satellite-based EOT20 tidal model. Spatially-averaged vector difference between the EOT20 model and GFO results in the Bohai Sea is only 2.12 cm (eight major constituents averaged). Moreover, except for GFO, MHACS also has the potential to be applied to sun-synchronous satellites such as Envisat, Sentinel series, and Haiyang series.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140621072","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 variability and long-term winter shoaling of the upper mixed layer in the southern Baltic Sea","authors":"Anna Izabela Bulczak ,&nbsp;Kacper Nowak ,&nbsp;Jaromir Jakacki ,&nbsp;Maciej Muzyka ,&nbsp;Daniel Rak ,&nbsp;Waldemar Walczowski","doi":"10.1016/j.csr.2024.105232","DOIUrl":"https://doi.org/10.1016/j.csr.2024.105232","url":null,"abstract":"<div><p>The upper ocean mixed layer plays a crucial role in regulating the exchange between the ocean and the atmosphere. The Mixed Layer Depth (MLD) is a key parameter affecting the air-sea exchanges of momentum and heat and determining the upper ocean temperature. Numerous previous studies have investigated MLD variability in the global ocean or regional seas but no such studies were carried in the Baltic Sea. In this study, we present the first observational assessment of the MLD and its properties in the Southern Baltic Sea including quantification of its seasonal and long-term changes and identification of the multi-year winter shoaling. We calculated monthly maps of MLD in the southern Baltic Sea using a large number of historical CTD profiles collected in 1995–2021 from a combination of different data sets. To test the robustness of the results we compared the MLDs calculated using different threshold methods. Throughout the southern Baltic Sea, across its three basins, a distinct seasonality is evident in the MLD, with values varying from 12 m in July to 60 m in December–March. During winter the water column is well mixed down to the upper halocline depth and the MLD reaches about 45 m in the Bornholm Basin, 50 m in the Slupsk Furrow, and 60 m in the Gdansk Basin. The observed global warming and decadal changes in the salty inflows from the North Sea to the Baltic have had an impact on stratification by increasing water densities in the intermediate and deep layers. Consequently, density gradients have strengthened with depth while the upper ocean mixing has weakened during the winter season. The results reveal a significant winter shoaling of the mixed layer by 4 m per decade, driven by the increased stratification due to rising temperatures and salinity. These changes could have significant impacts on the dynamics and productivity of marine ecosystems.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140647577","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":"Effect of wind–wave conditions on the distribution of the phytoplankton community in the coastal area of the southern Crimea in spring (Black Sea)","authors":"S.B. Krasheninnikova ,&nbsp;R.I. Lee ,&nbsp;S.A. Babich","doi":"10.1016/j.csr.2024.105229","DOIUrl":"https://doi.org/10.1016/j.csr.2024.105229","url":null,"abstract":"<div><p>Based on the measurement data obtained during the 121th cruise of the RV <em>Professor Vodyanitsky</em>, regularities were established between spatial distribution of quantitative characteristics and phytoplankton species composition, chlorophyll <em>a</em> concentration, and hydrometeorological parameters of the environment on the southern Crimean coast in the spring 2022. Chlorophyll <em>a</em> concentration was compared with satellite observation data of high spatial resolution. In selected areas with different shelf depths, the features of the distribution of phytoplankton indicators under conditions of changing hydrometeorological parameters were studied. The mechanisms of vertical water exchange were described. In coastal waters of the Crimea (Foros–Novy Svet), with intense western wind contributing to Ekman upwelling and low water temperature is a consequence of the upwelling, rather high values of phytoplankton biomass and abundance and chlorophyll <em>a</em> concentration were recorded, which were accompanied by the highest values of oxygen content. In the area of Sudak–Feodosiya, with intense northeastern wind and waves and with quite high water temperature, low dissolved oxygen, low values of phytoplankton biomass and abundance and chlorophyll <em>a</em> concentration were registered. Apparently, in Sevastopol area, Ekman upwelling arises under the effect of northern and northwestern winds. In three regions, dinoflagellate microalgae prevailed in spring 2022 in phytoplankton biomass. Those accounted for 52, 66, 81 % of the total number of species identified in the regions: Foros–Novy Svet, Sudak–Feodosiya, near Sevastopol, respectively. Thus, the main mechanisms were analyzed, which drive spatial distribution of quantitative characteristics and species composition of the phytoplankton community in the Crimean coastal water area with different shelf depths in spring.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140632587","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":"Upwelling along the southeast African coastline and links to cold water temperature anomalies at Sodwana Bay, South Africa","authors":"C. Wells,&nbsp;J. Pringle,&nbsp;D.D. Stretch","doi":"10.1016/j.csr.2024.105227","DOIUrl":"https://doi.org/10.1016/j.csr.2024.105227","url":null,"abstract":"<div><p>Coral bleaching is a major concern for the health and survival of coral reefs worldwide, as it can significantly reduce coral growth and increase coral susceptibility to disease. The coral reefs at Sodwana Bay, located on the northeastern coast of South Africa, have shown resilience to coral bleaching which has been attributed to cold water temperature anomalies observed at Sodwana. This study investigates the regional hydrodynamic processes associated with 63 temperature anomalies identified at Sodwana between 1994 and 2015. The study found that 65% of the anomalies are associated with remote upwelling of cold water near the Delagoa Peninsula, followed by advection from the Delagoa Bight towards the Sodwana region. The cold upwelled water advects directly from the peninsula along the shelf towards Sodwana or recirculates within the Delagoa Bight before advecting along the coastline to Sodwana. The remaining 35% of the anomalies were associated with local upwelling within the KwaZulu-Natal Bight south of Sodwana.</p><p>The study also found that the separation of the strong intermittent southward stream from the Delagoa Peninsula is strongly linked to the upwelling at the Delagoa Peninsula. The cold upwelled water is then advected to the Sodwana region by regional flow patterns, resulting in a temperature anomaly at Sodwana. The local upwelling is similarly linked to an increase in the Agulhas Current velocity magnitude around Sodwana and flow separation of the current from the coastline at the northern extent of the KwaZulu-Natal Bight.</p><p>The cross-correlations between the conditionally averaged flow fields associated with remote and local upwelling near the Delagoa Peninsula and the instantaneous flow fields at the time of the upwelling showed a positive correlation for all the anomalies over the 21 years. The anomalies associated with remote upwelling have an average correlation coefficient of 0.67 with a maximum correlation of 0.96. The anomalies associated with local upwelling have an average correlation coefficient of 0.74 with a maximum correlation of 0.98.</p><p>This study shows that the unique geometry of the southeast African coastline is a key factor associated with the cold water temperature anomalies at Sodwana. The interaction between the regional hydrodynamics and coastline features such as the Delagoa and Natal Bights, are crucial for the upwelling that eventually leads to the cold water temperature anomalies at Sodwana. Without these coastline features and the intermittent strengthening of the southward streams along the coastline due to the high eddy kinetic energy associated with the region, it is likely that these temperature anomalies would not occur at Sodwana. Without these temperature anomalies, the Sodwana coral reefs would become more vulnerable to climate change and coral bleaching.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0278434324000578/pdfft?md5=cf379b352347a612b58fe5268a3c4f58&pid=1-s2.0-S0278434324000578-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140540549","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":"Influence of warm surface water originating from the East China Sea on surface water temperature off the south coast of Korea in summer","authors":"Jong-Kyu Kim ,&nbsp;Byoung-Ju Choi","doi":"10.1016/j.csr.2024.105226","DOIUrl":"https://doi.org/10.1016/j.csr.2024.105226","url":null,"abstract":"<div><p>Surface seawater temperature in the southwestern coast of Korea suddenly rose in the summer of 2017. This rapid temperature rise event occurred simultaneously with a change in wind direction in the Korea Strait from northwesterly to southeasterly due to the approach of typhoon Noru. To identify the causes of the abrupt rise in surface temperature, the variations of the surface currents and temperature were investigated using a three-dimensional ocean circulation model. Warm and less saline surface water, a mixed shelf water of the Changjiang Diluted Water and saline water from an onshore branch of the Kuroshio in the East China Sea (ECS), flowed northeastward to the west and south of Jeju Island, proceeding eastward through the Jeju and Korea Straits. While westerly winds prevailed, wind-driven ageostrophic currents flowed southeastward, moving away from the south coast of Korea, due to Ekman transport. The shallow coastal region was occupied by cool and saline surface water (T &lt; 22 °C, S &gt; 32.5 psu). However, after the wind shifted to an easterly direction, the surface ageostrophic currents realigned northwestward, and the warm and less saline water moved into the shallow coastal region. In a passive tracer dispersal experiment, dyes injected from the ECS flowed to the west of Jeju Island and through the Jeju Strait via geostrophic currents. These dyes did not affect the shallow southern coastal region of Korea while the westerly winds dominated. However, during the easterly wind event, the dyes were advected toward the coast by the coastward Ekman transport. An analysis of temperature data observed at Cheongsando over 16 years and the tracer experiment revealed that the abrupt temperature rise in the summer of 2017 was a marine heatwave event generated by the advection of warm and less saline surface water from the ECS to the southwestern coast of Korea through the Jeju Strait.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140632585","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":"Water mass exchange in triangle seas of the Java-Makassar-Flores (JMF): A modeling study","authors":"Apriansyah ,&nbsp;Agus Saleh Atmadipoera ,&nbsp;Nyoman Metta N. Natih ,&nbsp;Dwiyoga Nugroho ,&nbsp;Rina Zuraida ,&nbsp;M. Tri Hartanto ,&nbsp;M. Syahdan","doi":"10.1016/j.csr.2024.105225","DOIUrl":"https://doi.org/10.1016/j.csr.2024.105225","url":null,"abstract":"<div><p>The ocean dynamics of the marginal seas in the Java-Makassar-Flores (JMF) Triangle seas facilitates the seasonal exchange of water masses between Java, Makassar, and Flores, which influences the occurrence of small pelagic fish. This research investigates seasonal fluctuations in sea currents, seawater temperature, salinity, and phytoplankton primary production (PPN and PPD) based on validated model output datasets from NEMO and PISCES from the INDESO simulation (2008–2015). The model demonstrated seasonal exchanges of the top 50 m of water masses in the area, where the eastward monsoon current transported freshwater (salinity&lt;31 psμ) from the Java Sea to southern Makassar and Flores. This northwest monsoon produced a much fresher water in the southern region of Makassar and western region of Flores. During the southeast monsoon, the surface component of the Makassar throughflow, which transports saline water (salinity &gt;34 PSU) into the Java Sea, pushes fresh Java waters westward. Seasonal salinity changes and PPN/PPD in the shelf region of southern Kalimantan correlated with substantial small pelagic fishing.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140533855","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":"Numerical investigation of infragravity wave hydrodynamics at fringing reef with a permeable layer","authors":"K. Qu,&nbsp;X. Wang,&nbsp;Y. Yao,&nbsp;J. Men,&nbsp;R.Z. Gao","doi":"10.1016/j.csr.2024.105212","DOIUrl":"https://doi.org/10.1016/j.csr.2024.105212","url":null,"abstract":"<div><p>In tropical and subtropical coastal regions, coral reefs are abundant and play a vital role in maintaining ecosystem balance. Additionally, they effectively dissipate a significant amount of wave energy that propagates from the open sea towards the coastline, providing coastal areas with protection against wave impacts. Consequently, numerous scholars have conducted extensive research to investigate the hydrodynamic characteristics of wave propagation and transformation over coral reef topography. However, previous studies have often simplified the bottom boundary of coral reefs as impermeable layers, neglecting the fact that the coral reef consists of a permeable canopy structure in the actual marine environment. To fill the knowledge gap of previous research, this study is based on the Non-Hydrostatic Wave Model Solver (NHWAVE) to numerically simulate the propagation process of random waves over permeable coral fringing reefs. The study takes a comprehensive approach by considering the influences of various factors on the hydrodynamic characteristics of random waves over the fringing reef, including incident wave height, reef-flat water depth, peak wave period, permeable layer thickness, permeable layer porosity, and median diameter of the permeable layer. This paper focuses primarily on analyzing the variations in sea-swell wave height (<span><math><mrow><msub><mi>H</mi><mrow><mi>S</mi><mi>S</mi></mrow></msub></mrow></math></span>), infragravity wave height (<span><math><mrow><msub><mi>H</mi><mrow><mi>I</mi><mi>G</mi></mrow></msub></mrow></math></span>), and mean water level (<span><math><mrow><mi>M</mi><mi>W</mi><mi>L</mi></mrow></math></span>) along the fringing reef, while conducting a comparative analysis between fringing reefs with a permeable layer and impermeable fringing reefs. The findings reveal that the presence of a permeable layer reduces the shallow water deformation of waves on the fore-reef slope and mitigates the wave-breaking phenomenon near the reef edge, thereby significantly reducing the sea-swell wave height (<span><math><mrow><msub><mi>H</mi><mrow><mi>S</mi><mi>S</mi></mrow></msub></mrow></math></span>), infragravity wave height (<span><math><mrow><msub><mi>H</mi><mrow><mi>I</mi><mi>G</mi></mrow></msub></mrow></math></span>), and wave setup on the reef-flat. Furthermore, the permeable layer's existence also leads to a decrease in the maximum wave run-up height on the back-reef slope. The research findings of this study can further enhance our understanding of the hydrodynamic characteristics of infragravity waves over fringing reefs, which is significant for studying the impact of random waves on coastal areas and understanding the protective mechanisms of coral reefs in coastal regions.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140350581","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":"Interannual-decadal variations in the Yellow Sea Cold Water Mass in summer during 1958–2016 using an eddy-resolving hindcast simulation based on OFES2","authors":"Hao Li ,&nbsp;Fangguo Zhai ,&nbsp;Yujie Dong ,&nbsp;Zizhou Liu ,&nbsp;Yanzhen Gu ,&nbsp;Peng Bai","doi":"10.1016/j.csr.2024.105223","DOIUrl":"https://doi.org/10.1016/j.csr.2024.105223","url":null,"abstract":"<div><p>In the Yellow Sea, a large volume of cold water with temperature below 10 °C exists in the bottom layer in summer and affects the regional circulation, climate and marine ecosystem. Here, we investigated in detail the interannual-decadal variations in the summer Yellow Sea Cold Water Mass (YSCWM) using six decades (1958–2016) of a quasi-global eddy-resolving hindcast simulation, which was validated with observations. Results indicated that volume and mean temperature of the YSCWM were 0.52 × 10¹²–4.10 × 10¹² m³ (2.22 × 10¹² m³ on average) and 8.53–9.32 °C (8.94 °C on average). The YSCWM was dominated by interannual-decadal variations with a weakly warming and shrinking trend. The YSCWM volume (mean temperature) had larger (smaller) average values and varied more significantly during the two periods of 1958–1988 and 2005–2016 than during 1989–2004. Interannual-decadal variations in the summer YSCWM agreed with those in February temperature in the Yellow Sea, which were primarily caused by net surface heat flux variations, with a minor but negative contribution from heat exchange with the East China Sea through the northward Yellow Sea warm current and southward coastal currents. Winter net surface heat flux variations were dominated by latent heat flux and sensible heat flux, both of which resulted from combined effects of the Siberia High, Western Pacific pattern and Arctic Oscillation through controlling sea surface wind speed and air temperature over the Yellow Sea. The current study provided a more complete picture and in-depth understanding of changes in the summer YSCWM responding to large-scale climate change and variabilities during the past six decades.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140332652","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":"Temporal and spatial variability of ichthyoplankton assemblages in the Eastern Tropical Pacific off Colombia","authors":"Bellineth Valencia,&nbsp;Marisol Rivera-Gómez,&nbsp;Mauricio Jerez-Guerrero,&nbsp;Mariana Rondón-Ramos,&nbsp;Alan Giraldo","doi":"10.1016/j.csr.2024.105228","DOIUrl":"https://doi.org/10.1016/j.csr.2024.105228","url":null,"abstract":"<div><p>We investigated the spatiotemporal variability of the ichthyoplankton assemblages along the northern Pacific coast of Colombia. This region is characterized by high biodiversity and important artisanal fisheries, yet knowledge of the dynamics of the early life history of fish is scarce. Three sites (north: 6.3°N, central: 5.7°N, south: 4.9°N) were sampled every other month for a year, covering a gradient of varying coastal geomorphology along ∼240 km of the coast. Fish larvae abundances were significantly higher at the southern site (LMEM, p &lt; 0.05), and showed positive relationships to chlorophyll-a (Chl-a), mesozooplankton biomass, and surface temperatures, and a negative relationship to surface salinities (LMEM, p &lt; 0.05). Species richness was similar at the three sites (106–117 spp.), but evenness was lower at the southern site due to the dominance of <em>Cetengraulis mysticetus</em> (39–82%) most of the year and one unidentified Labrisomidae in March (92.7%). At the central and northern sites, <em>C. mysticetus</em> was also abundant, although not as dominant, in conjunction with <em>Eucinostomus</em> sp. Besides these two species, <em>Stellifer</em> sp.1 and <em>Auxis rochei</em> drove differences in assemblages at the central site, whereas two Pomacentridae (<em>Abudefduf troschelii</em>, Pomacentridae sp.), <em>Sphyraena ensis, Caranx sexfasciatus</em>, and two Scombridae (<em>Euthynnus lineatus</em>, <em>Katsuwonus pelamis</em>) differentiate the assemblages at the northern site. Multivariate analyses suggest that fish larvae assemblages were significantly different among sampling dates (PERMANOVA, p &lt; 0.05), and that temporal changes in Chl-a, mesozooplankton biomass, and surface salinities were correlated with assemblage variability. Our study highlights the important effects of seasonal changes in water column hydrographic conditions on the spatiotemporal variability of ichthyoplankton assemblages in coastal sites of the Eastern Tropical Pacific.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140543724","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}