Journal of Marine Systems最新文献

{"title":"Climate-related habitat variations of Humboldt squid in the eastern equatorial Pacific Ocean","authors":"Jian Wen ,&nbsp;Ziying Zhou ,&nbsp;Yang Zhang ,&nbsp;Wei Yu ,&nbsp;Bingjian Chen ,&nbsp;Xinjun Chen","doi":"10.1016/j.jmarsys.2023.103960","DOIUrl":"10.1016/j.jmarsys.2023.103960","url":null,"abstract":"<div><p>An integrated habitat suitability index (HSI) model was developed in this study for <span><em>Dosidicus gigas</em></span><span> in the eastern equatorial waters of the Pacific Ocean to explore climate-related spatial and temporal variability in the habitat distribution pattern based on three crucial environmental variables: sea surface temperature<span> (SST), sea surface salinity (SSS) and chlorophyll-a concentration (Chl-a). Results revealed that the HSI model could accurately predict potential habitats for </span></span><em>D. gigas</em><span><span><span>. The habitat suitability varied significantly by month, with highest suitability in April and lowest in March. Besides, from December to May, the longitudinal gravity center of the fishing grounds (LONG) and the HSI overall shifted eastward and the latitudinal gravity center shifted northward then southward. In comparison to the warm ENSO phases in 2019, the cold ENSO phases in 2018 produced increased suitable habitat from December to May, leading to a significantly higher </span>CPUE. Prospective high-quality habitats in 2018 primarily occurred in the western regions, with the exception of December, which resulted in a more westward distribution of LONG from January to May. High-quality habitats moved northward from December to February and southward from March to May 2018, compared to minor latitudinal movement in 2019. It was inferred that annual variations in </span>squid abundance and distribution were largely affected by the SST-related habitat pattern of </span><em>D. gigas</em> in the eastern equatorial waters. Our findings suggested that <em>D. gigas</em> habitats clearly varied by month and year and were greatly influenced by climate-induced environmental changes.</p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"243 ","pages":"Article 103960"},"PeriodicalIF":2.8,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138683723","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":"Decomposing acoustic signal reveals the pelagic response to a frontal system","authors":"L. Izard ,&nbsp;N. Fonvieille ,&nbsp;C. Merland ,&nbsp;P. Koubbi ,&nbsp;D. Nerini ,&nbsp;J. Habasque ,&nbsp;A. Lebourges-Dhaussy ,&nbsp;C. Lo Monaco ,&nbsp;G. Roudaut ,&nbsp;F. d’Ovidio ,&nbsp;J.-B. Charrassin ,&nbsp;C. Cotté","doi":"10.1016/j.jmarsys.2023.103951","DOIUrl":"10.1016/j.jmarsys.2023.103951","url":null,"abstract":"<div><p><span><span><span><span>The pelagic zone is home to a large diversity of organisms such as macrozooplankton and </span>micronekton<span> (MM), connecting the surface productive waters to the mesopelagic layers (200-1000 m) through diel vertical migrations (DVM). </span></span>Active acoustics<span> complement net sampling observations by detecting sound-scattering layers (SL) of organisms, allowing to monitor the MM dynamics with a high spatio-temporal resolution. Multi-frequency analyses are a pertinent approach to better integrate the rich diversity of organisms composing SLs and their respective dynamics. However, analysing simultaneously emitted acoustic signals with distinct depth ranges and separating spatial from temporal variability is challenging and needs adapted tools to be fully exploited. This study examines the pelagic realm in a transition zone between the Southern Ocean and the subtropical Indian Ocean, crossing the Saint-Paul and Amsterdam islands’ natural reserve. We extended a Multivariate Functional Principal Component Analysis (mfPCA) to analyse the joint vertical variation of five frequencies from two oceanographic cruises (2016 and 2022), allowing the decomposition of the acoustic dataset into orthogonal vertical modes (VM) of variability. We found the first VM to be linked to the temporal variability due to DVM, while the following majorly depict patterns in spatial distribution. Overall, from the subantarctic to the subtropical zones, we observed (i) enrichment of densities in the surface layer (0–100 m), (ii) a decrease in densities in the intermediate layer during the daytime (100–300 m) and (iii) the apparition of an intensive </span></span>deep scattering layer on the 38 kHz. We explored VMs’ connection with </span><em>in-situ</em><span> environmental conditions by clustering our observations into three distinct environmental-acoustic regions. These regions were compared with vertically integrated nautical area scattering coefficient distribution, a proxy for marine organisms’ biomass. Additionally, we analysed species assemblage changes from complementary cruises to further elucidate the observed acoustic distribution. We show that the mfPCA method is promising to better integrate the pelagic horizontal, vertical and temporal dimensions which is a step towards further investigating the control of the environment on the distribution and structuring of pelagic communities.</span></p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"243 ","pages":"Article 103951"},"PeriodicalIF":2.8,"publicationDate":"2023-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138566032","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":"Clustering as a mechanism for enhanced reaction of buoyant species","authors":"Jamie Meacham ,&nbsp;Pavel Berloff","doi":"10.1016/j.jmarsys.2023.103952","DOIUrl":"https://doi.org/10.1016/j.jmarsys.2023.103952","url":null,"abstract":"<div><p>Buoyant material has a tendency to form dense clusters at the ocean surface. This has been observed in distributions of marine life and floating plastic contaminants. The main mechanism behind this is that particles with positive/neutral buoyancy do not behave as passive tracers in stratified flows. It could be expected that coextensive clustering between plankton and toxic ocean contaminants could lead to enhanced ecological risk. However, such interactions cannot be sufficiently modelled in a standard passive tracer approximation. Given the large uncertainty in the form of converging currents and how to model interactions of buoyant tracers, we opt for an idealised modelling approach. The simplicity of our model allows easy interpretation of the novel physical considerations. We demonstrate that the global dynamics of our biogeochemical model are significantly altered by clustering forces. Most notably, a new balance in the ecosystem exists in which reactions are dominated entirely by those within the dense clusters. This greatly enhances the impact of destructive pollutants through efficient mixing. There is evidence that this equilibrium will be robust moving to more complex and realistic models.</p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"243 ","pages":"Article 103952"},"PeriodicalIF":2.8,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0924796323000969/pdfft?md5=ea5e400940f4ddd71221e027cb0adbe0&pid=1-s2.0-S0924796323000969-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138490532","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":"Origin and evolution of the surface desalinated layer of the Kara Sea during the ice-free period","authors":"Uliana Kazakova,&nbsp;Alexander Polukhin,&nbsp;Pavel Shabanov","doi":"10.1016/j.jmarsys.2023.103950","DOIUrl":"10.1016/j.jmarsys.2023.103950","url":null,"abstract":"<div><p>This work focuses on the freshwater contribution (water from the Ob’ and Yenisei rivers and ice meltwater) to the surface layer of the Kara Sea according to 2015–2020 expedition data. Salinity<span><span> and hydrochemical data (total alkalinity and silicates) were used to calculate the proportion of freshwater in the desalinated layer of the Kara Sea. The ratio of the water fractions with the linear mixing of several sources was considered. Our results showed that riverine sources varied greatly, and the total contributions of the Ob’ and Yenisei runoff ranged from 10 to 60%, while the contribution of ice meltwater did not exceed 25%. The relationship between the period of seasonal ice retreat in the Kara Sea and its proportion in the surface desalinated layer was revealed. The interannual variability in freshwater source composition varied greatly from the southwestern to the eastern part of the sea owing to wind forcing and </span>seasonality in river discharge.</span></p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"243 ","pages":"Article 103950"},"PeriodicalIF":2.8,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138496613","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":"CO2 fluxes under different oceanic and atmospheric conditions in the Southwest Atlantic Ocean","authors":"Celina Cândida Ferreira Rodrigues ,&nbsp;Marcelo Freitas Santini ,&nbsp;Nathaniel Alan Brunsell ,&nbsp;Luciano Ponzi Pezzi","doi":"10.1016/j.jmarsys.2023.103949","DOIUrl":"https://doi.org/10.1016/j.jmarsys.2023.103949","url":null,"abstract":"<div><p><span>The Southwest Atlantic Ocean (SAO) is one of the largest global carbon sink areas. Therefore, the main objective of this study is to investigate turbulent CO</span>₂<span> flux behavior and quantify it in the presence of an intense horizontal sea surface temperature (SST) gradient in the SAO under different atmospheric conditions. </span><em>In-situ,</em><span> satellite, and reanalysis data were used from October 14 to 27, 2018 to achieve this objective. The study area was divided into four areas based on satellite observations of SST, salinity, and chlorophyll. The CO</span>₂<span> flux was calculated using the eddy covariance method. During the experiment the area absorbing the most CO</span>₂<span> was the Brazil Current (BC) owing to its proximity to the chlorophyll-rich and less saline waters of the La Plata River and the cold and less saline waters from the Malvinas Current (MC). Moreover, intense wind speeds increased the CO</span>₂ flux between the ocean and atmosphere. The Brazil Malvinas Confluence (BMC) also behaved as a CO₂ sink, and the modulation of CO₂<span> fluxes was due to the intense horizontal gradient of SST together with the moderate surface wind and turbulence. During the experiment, the MC sequestered less carbon than other regions because of the presence of high-pressure atmospheric systems near the region, resulting in high atmospheric stability, that inhibited mass exchange between the ocean and atmosphere. Vertical mixing mechanisms were identified at the BMC on the cold side, over MC waters. However, in the BC waters, the marine atmospheric boundary layer was modulated by the high-pressure atmospheric system, which suppressed the turbulent mixing. However, the intense mass exchange between the ocean and atmosphere was inhibited, and the area behaved as a mild CO</span>₂<span> sink because of the high-pressure system. This research contributes to a better understanding of the role of the SAO in the global carbon balance in a climate change scenario, and we showed that area can act as a CO</span>₂ sink or source, depending on the large-scale atmospheric conditions acting.</p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"243 ","pages":"Article 103949"},"PeriodicalIF":2.8,"publicationDate":"2023-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138472513","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":"Influences of catastrophic floods on the biogeochemistry of organic matter and nutrients in the Changjiang River estuary","authors":"Ailing Yao, Lei Gao, Yue Ming","doi":"10.1016/j.jmarsys.2023.103922","DOIUrl":"https://doi.org/10.1016/j.jmarsys.2023.103922","url":null,"abstract":"","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"1 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"54529007","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 the interannual freshwater discharge on hydrodynamical patterns in central-southern Chile (35°-38°S) using a high-resolution circulation model","authors":"Odette A. Vergara, V. Echevin, M. Sobarzo, H. Sepúlveda, L. Castro, S. Soto-Mendoza","doi":"10.1016/j.jmarsys.2023.103862","DOIUrl":"https://doi.org/10.1016/j.jmarsys.2023.103862","url":null,"abstract":"","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42753613","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":"Internal solitary waves enhancing turbulent mixing in the bottom boundary layer of continental slope","authors":"Changwei Bian ,&nbsp;Xiudan Ruan ,&nbsp;Haonan Wang ,&nbsp;Wensheng Jiang ,&nbsp;Xiaolei Liu ,&nbsp;Yonggang Jia","doi":"10.1016/j.jmarsys.2022.103805","DOIUrl":"10.1016/j.jmarsys.2022.103805","url":null,"abstract":"<div><p><span>The importance of internal solitary waves<span><span><span> (ISWs) to the energy and material transport in the upper ocean has been confirmed, but how ISWs affect turbulent mixing in the bottom boundary layer is lack of direct field observation. To reveal the characteristics of ISWs and the turbulent mixing they cause in the bottom boundary layer, a 36-h fine-scale observation of ISWs and their influence on turbulent mixing was conducted at the South China Sea slope (water depth: 659 m). During the observation, a group of ISWs passed by with horizontal and vertical velocities of 0.2 and 0.04 m/s at 0.1 m above bottom (mab) respectively, resulting in strong velocity shear exceeding 0.5 m/s per meter. When the ISWs passed through the slope, although they did not deform and break near the </span>seabed, they increased the bottom shear stress, turbulent kinetic energy production rate and turbulent kinetic </span>energy dissipation rate (</span></span><em>ε</em>) at 0.6 mab several times. The ISWs induced <em>ε</em> reached O (10⁻⁶) W/kg, which was one order of magnitude higher than the previously observed <em>ε</em> in the upper ocean of the South China Sea slope. At the same observation site, the internal tides induced <em>ε</em> in the bottom boundary layer was O (10⁻⁵) W/kg, which indicated that the internal tides played a more important role than the ISWs in enhancing bottom turbulent mixing.</p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"236 ","pages":"Article 103805"},"PeriodicalIF":2.8,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41738533","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":"Vertical distribution of zooplankton groups, with an emphasis on fish larvae, in the oxygen minimum zone off southern México (December 2020)","authors":"L. Sánchez-Velasco ,&nbsp;F.J. García-De León ,&nbsp;E.D. Ruvalcada-Aroche ,&nbsp;E. Beier ,&nbsp;V.M. Godínez ,&nbsp;S.P.A. Jiménez-Rosenberg ,&nbsp;E.D. Sánchez-Pérez ,&nbsp;F. Contreras-Catala ,&nbsp;A. Mnich ,&nbsp;N. Verma ,&nbsp;M. Altabet","doi":"10.1016/j.jmarsys.2022.103801","DOIUrl":"10.1016/j.jmarsys.2022.103801","url":null,"abstract":"<div><p><span><span>The distribution of zooplankton groups, with an emphasis on fish larvae, in the Oxygen Minimum Zone off southern </span>Mexico (December 2020) was analyzed. A hydrographic section of five sampling stations was made in the confluence of Transitional Water and Tropical Surface Waters. In each station, horizontal zooplankton trawls on three different dissolved oxygen conditions (~100, &lt; 44 and &lt; 4.4 μmol kg</span>⁻¹) were carried out by a MOCNESS net (333 μm). The 100 μmol kg⁻¹ oxypleth (oxic condition) was ~60 m depth along the section, but the 4.4 μmol kg⁻¹<span> oxypleth (suboxic) rose southward from Transitional Water (~ 150 m) to Tropical Surface Water (~ 90 m), approaching the well oxygenated layer. The distribution of the zooplankton biomass, and the most abundant zooplankton groups (e.g. copepods, chaetognaths, ostracods, euphausiids) and fish larvae showed statistically significant differences (</span><em>P</em> &lt; 0.01) between the oxic (100 μmol kg⁻¹<span>) and the deeper suboxic conditions. The larvae of typically dominant fish species such as the bathypelagic </span><em>Vinciguerria lucetia, Diogenichthys laternatus, Diaphus pacificus and Cubiceps pauciradiatus,</em><span> were present only in the oxygenated depths in the Transitional Water, and were almost absent from all depths in the Tropical Surface Water, where the oxycline shoaled. These differences in larval fish abundance were found despite little change in chlorophyll </span><em>a</em> concentration (relative units “r.u.”) along the sections, indicating that the oxycline is a limiting factor for the fish larvae. The fish larvae results contrast with previous observations from the mouth of the Gulf of California, where some species have distributions independent of water column dissolved oxygen conditions, probably as a consequence of coastal processes. Overall, our results show that even within the OMZ, variations in oxycline depth have biological implications, particularly on meroplanktonic organisms.</p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"236 ","pages":"Article 103801"},"PeriodicalIF":2.8,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42234459","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":"A review of zooplankton and deep carbon fixation contributions to carbon cycling in the dark ocean","authors":"Brenda J. Burd,&nbsp;Richard E. Thomson","doi":"10.1016/j.jmarsys.2022.103800","DOIUrl":"10.1016/j.jmarsys.2022.103800","url":null,"abstract":"<div><p><span><span><span><span>Models of the marine carbon cycle assume that virtually all heterotrophic production in the </span>open ocean is derived from near-surface </span>carbon fixation<span> (primary production) by phytoplankton. However, current </span></span>carbon budget estimates show that respiration throughout the ocean far exceeds surface primary production. This disconnect can be grouped into two categories: </span><span><em>Inaccurate estimates of water column respiration and </em><em>carbon transport</em><em> from metazoans</em></span>; and <em>missing primary production sources and.</em></p><p><em>heterotrophic processing in the dark ocean.</em> In this review, we examine the contribution to the ocean carbon cycle of chemoautotrophic production, as well as secondary production and respiration from meso-zooplankton and micro-nekton below 400 m depth.</p><p>About one-third of epipelagic biomass in the ocean migrates diurnally, distributing dissolved organic carbon<span><span> (DOC) and total nitrogen (TN), along with about 30–80% of the particulate organic carbon (POC) flux, from the upper ocean. Although mostly this occurs in the upper 400 m, migration depths can extend to 3000 m. In addition, up to 80% of the biomass of secondary consumers in the open ocean live part of their life cycle at depths up to 2000 m, contributing significantly to deep-sea respiration and particle flux, particularly over fall/winter in temperate-subarctic oceans, </span>submarine canyons, and deep seas such as the Mediterranean. This active flux provides fresh organic input to the deep ocean at a time of year when surface primary productivity, and thus organic carbon (OC) flux to the deep ocean, is low. The complex spatial, temporal and depth scales of horizontal and vertical migration make modelling of the global oceanic carbon cycle extremely complex, requiring consideration of biomass movements throughout the entire water column over diurnal, lunar and seasonal cycles over broad geographic regions.</span></p><p>An additional 10 to 50% of surface primary production occurs within mid-depth oxygen minimum zones (OMZs), fuelled by ammonia excreted from vertically migrating zooplankton concentrated near OMZ boundaries. Crustal sources such as gas and methane seeps, hydrothermal vents<span> and submarine volcanoes support active deep-sea food webs, as well as contributing to upper ocean productivity. Crustal sources are conservatively estimated to provide &gt;30%, and probably up to 50%, of oceanic OC flux to the dark ocean. These estimates are still poorly constrained but can no longer be ignored in global oceanic carbon cycles.</span></p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"236 ","pages":"Article 103800"},"PeriodicalIF":2.8,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"54528951","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}