Journal of Marine Systems最新文献

{"title":"Anticyclonic mesoscale eddy induces mesopelagic biomass hotspot in the oligotrophic ocean","authors":"Yuan Wang, Jinhui Zhang, Jiancheng Yu, Qiaoyan Wu, Dong-sheng Sun","doi":"10.1016/j.jmarsys.2022.103831","DOIUrl":"https://doi.org/10.1016/j.jmarsys.2022.103831","url":null,"abstract":"","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45135166","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":"Microbial metabolic activity in two basins of the Gulf of Mexico influenced by mesoscale structures","authors":"Josué Villegas-Mendoza ,&nbsp;Eliana Gómez-Ocampo ,&nbsp;Jorge Velásquez-Aristizábal ,&nbsp;Diana Rodríguez-Escobar","doi":"10.1016/j.jmarsys.2022.103781","DOIUrl":"10.1016/j.jmarsys.2022.103781","url":null,"abstract":"<div><p>Information on microbial metabolic activity is essential for quantifying carbon and energy flows through marine food webs. We quantified community (R_com) and prokaryotic (R_pro<span><span>) respiration rates, bacterial production (BP), bacterial abundance (BA), and bacterial growth efficiencies (BGE) in the Perdido and Coatzacoalcos basins of the Gulf of Mexico (GOM) during summer and winter conditions in 2016. Our results showed seasonal, regional, and </span>mesoscale eddy influences on those metabolic variables. R</span>_pro accounted for &gt;60% of total respiration in both regions, being three times higher in stations influenced by a cyclonic eddy (CE) in September (24.1 μM O₂ d⁻¹) than in stations affected by an anticyclonic eddy in March (7.2 μM O₂ d⁻¹) within the Coatzacoalcos basin where the eddy-trapping mechanism advected biomass-enriched waters from the Bay of Campeche. The eddy-stirring mechanism produced horizontal and vertical dipole patterns of metabolic variables increasing up to one order of magnitude R_com and R_pro<span> while decreasing BGE to 25-fold from the southeastern to the northwestern edges in CEs. This finding indicates that dissolved organic matter is more actively taken up to build bacterial biomass on the eastern edge of CEs in the GOM, while R</span>_pro and R_com increase on the western edges. Satellite integrated primary production was coupled with surface R_pro and R_com at CEs and no eddies. BP was mainly regulated by CEs and was about 50% higher in the Coatzacoalcos basin (~0.03–0.14 μmol C L⁻¹ d⁻¹). BP increased in zones with high R_pro and R_com, suggesting that R_com<span><span><span> is associated with heterotrophic prokaryote activity in both basins. BGE was lower than 25% within the upper 500 m during both cruises, but the highest values were quantified in the </span>euphotic zone<span> and during the September cruise. Metabolic variables integrated over the water column showed that 40–80% of the microbial activity occurred between the base of the euphotic zone and 150 m depth. Our findings contribute to a better understanding of the metabolic activity of the </span></span>microbial communities in two regions of the GOM influenced by mesoscale eddies.</span></p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"234 ","pages":"Article 103781"},"PeriodicalIF":2.8,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41422549","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 influence of intrusion from the Kuroshio Current on microplankton biomass and community structure in the northern Satsunan area, western Japan","authors":"Mutsuo Ichinomiya ,&nbsp;Takehito Nomiya ,&nbsp;Tomohiro Komorita ,&nbsp;Toru Kobari ,&nbsp;Gen Kume ,&nbsp;Akimasa Habano ,&nbsp;Yoichi Arita ,&nbsp;Fumihiro Makino","doi":"10.1016/j.jmarsys.2022.103767","DOIUrl":"10.1016/j.jmarsys.2022.103767","url":null,"abstract":"<div><p><span>Seasonal variations in hydrographic conditions, nutrients, and microplankton abundance and biomass were investigated inside and outside Kagoshima Bay in the northern Satsunan area. The area is a nursery ground for the migrating fish. During the mixing season from November to April, highly saline water (&gt;34.5) originating from a branch of the Kuroshio Current, the western boundary current of the North Pacific Subtropical Gyre, intruded from the surface layer into the bay causing extrusion of coastal bottom water. This intrusion generated vertical mixing between surface water and nutrient-rich bottom water. Consequently, chlorophyll </span><em>a</em> concentrations increased (&gt;1 μg l⁻¹) around the bay mouth. During the stratified season from May to August, the coastal surface water was extruded due to intrusion of saline water from the bottom layer. High chlorophyll <em>a</em> concentrations (&gt;1 μg l⁻¹<span><span>) were also observed in the surface layer in July during the rainy season. Such differences in hydrographic conditions between mixing and stratified seasons were due to vertical distribution of highly saline water from outside the bay, which seasonally migrated between surface and subsurface layers. Relatively distinct redundancy analysis plots and boxplots generated from a generalized linear model showed that microplankton community structure differed between mixing and stratified seasons. The mixing and stratified seasons were characterized by high diatom abundance and low microplankton abundance, respectively, suggesting that vertical mixing increases nutrient supply and consequently increases diatom abundance. Thus, microzooplankton (mainly naked ciliates and athecate dinoflagellates) abundance was related to the abundance of prey organisms, such as diatoms, thecate dinoflagellates and cryptophyte-like flagellates, rather than hydrographic conditions. Thus, saline water intrusion from a branch of the Kuroshio Current likely governs hydrographic conditions in Kagoshima Bay and consequently affects temporal variations in abundance and taxonomic composition of </span>phytoplankton and microzooplankton communities.</span></p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"234 ","pages":"Article 103767"},"PeriodicalIF":2.8,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49086577","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":"Chlorophyll-a concentration climatology, phenology and trend in the optically complex waters of the St. Lawrence Estuary and Gulf","authors":"J. J. Laliberte, P. Larouche","doi":"10.1016/j.jmarsys.2022.103830","DOIUrl":"https://doi.org/10.1016/j.jmarsys.2022.103830","url":null,"abstract":"","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47813050","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 circulation due to deep-water renewal and phytoplankton blooms in the tropical fjord of Ambon Bay, eastern Indonesia","authors":"Gerry Giliant Salamena ,&nbsp;James C. Whinney ,&nbsp;Scott F. Heron","doi":"10.1016/j.jmarsys.2022.103776","DOIUrl":"10.1016/j.jmarsys.2022.103776","url":null,"abstract":"<div><p><span>This study provides the first observational evidence on the role of deep-water renewal in triggering phytoplankton<span> blooms in a rare shallow-silled tropical fjord (Ambon Bay). Seasonal variation in the tidal-induced deep-water intrusions into inner Ambon Bay (IAB, the fjord basin) upwardly displaces water from the IAB deep layer towards the surface. The budget method was employed to quantify vertical mixing in the deep layer of IAB (below sill depth) post-intrusions (stagnant periods). Within a spring-neap sequence (~ 2 weeks), deep-water intrusion pulses in IAB were observed to be more frequent in the easterly monsoon (July, eight pulses) than the transitional season (October, three pulses). These intrusion pulses uplifted the resident deep waters of IAB with rates of 2.4 - 4.0 m/day in the easterly monsoon and 1.5 - 1.8 m/day in the transitional season. Depth-averaged vertical diffusion coefficient (</span></span><em>K</em>_v) in the deep layer of IAB slightly varied between easterly monsoon (3.3 × 10^-4 m²/s) and transitional season (3.7 × 10^-4 m²/s). The parameterization of the vertical mixing-stratification relationship (<em>K</em>_v ∝ [<em>N</em>²]^-<em>β</em>) in the IAB deep layer was found to be larger in easterly monsoon (<em>β</em> = 1.104) than in transitional season (<em>β</em> = 0.694). Chlorophyll-a concentration in the water column of IAB increased during uplifting events with phytoplankton bloom conditions (&gt; 5 mg/m³) found only in the easterly monsoon. The described uplift mechanism as a driver of phytoplankton blooms should be included in future analyses of water quality for IAB.</p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"234 ","pages":"Article 103776"},"PeriodicalIF":2.8,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44158569","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":"Decadal trends in Ocean Acidification from the Ocean Weather Station M in the Norwegian Sea","authors":"Ingunn Skjelvan ,&nbsp;Siv K. Lauvset ,&nbsp;Truls Johannessen ,&nbsp;Kjell Gundersen ,&nbsp;Øystein Skagseth","doi":"10.1016/j.jmarsys.2022.103775","DOIUrl":"10.1016/j.jmarsys.2022.103775","url":null,"abstract":"<div><p>The Ocean Weather Station M (OWSM) is situated at a fixed position in the Norwegian Sea, one of the major basins of the Nordic Seas, which represents an important area for uptake of atmospheric CO₂ as well as deep water formation. At OWSM, the inorganic carbon cycle has been regularly monitored since 2001, and significant interannual changes of the carbonate system have been determined. Data collected at this site since the 1990s have been included, and over the 28 last years the surface fugacity of CO₂ (<em>f</em>CO₂) has increased by 2.92 ± 0.37 μatm yr⁻¹, while surface pH and aragonite saturation (Ω_Ar) have decreased by −0.0033 ± 0.0005 yr⁻¹ and −0.018 ± 0.003 yr⁻¹, respectively. This corresponds to a surface pH change of −0.092 over 28 years, which is comparable to the global mean pH decrease of −0.1 since the onset of the industrial revolution. Our estimates suggest that 80% of the surface pH trend at OWSM is driven by uptake of CO₂ from the atmosphere. In the deepest layer, Ω_Ar has decreased significantly (−0.006 ± 0.001 yr⁻¹) over the last 28 years, now occasionally reaching undersaturated values (Ω_Ar &lt; 1). As a rough estimate, the saturation horizon has shoaled by 7 m yr⁻¹ between 1994 and 2021. The increase in surface <em>f</em>CO₂ is confirmed by semi-continuous measurements of CO₂ from the site (2.69 ± 0.14 μatm yr⁻¹), and thus, the area has become less of a net sink for atmospheric CO₂, taking into consideration an atmospheric CO₂ increase at OWSM of 2.27 ± 0.08 μatm yr⁻¹.</p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"234 ","pages":"Article 103775"},"PeriodicalIF":2.8,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0924796322000768/pdfft?md5=0d3bf1146af75a19d49992b778628f5f&pid=1-s2.0-S0924796322000768-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48757503","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":"Role of suspended particulate material on growth and metal bioaccumulation in oysters (Crassostrea gigas) from a French coastal semi-enclosed production area, Arcachon Bay","authors":"Tiphaine Chouvelon ,&nbsp;Isabelle Auby ,&nbsp;Line Mornet ,&nbsp;Sandrine Bruzac ,&nbsp;Karine Charlier ,&nbsp;Daniel Ferreira Araújo ,&nbsp;Jean-Louis Gonzalez ,&nbsp;Patrice Gonzalez ,&nbsp;Pierre-Yves Gourves ,&nbsp;Claire Méteigner ,&nbsp;Myriam Perrière-Rumèbe ,&nbsp;Loïc Rigouin ,&nbsp;Emmanuelle Rozuel ,&nbsp;Nicolas Savoye ,&nbsp;Teddy Sireau ,&nbsp;Farida Akcha","doi":"10.1016/j.jmarsys.2022.103778","DOIUrl":"10.1016/j.jmarsys.2022.103778","url":null,"abstract":"&lt;div&gt;&lt;p&gt;&lt;span&gt;&lt;span&gt;&lt;span&gt;Arcachon Bay is a prominent oyster production area on the coast of Western Europe, and is subject to chemical contamination&lt;span&gt; including by trace metals. Recently, the national “mussel-watch” monitoring network – using local bivalves as semi-quantitative bioindicators of coastal chemical contamination – highlighted a significant increase in copper (Cu) concentrations in oysters from this bay. Here, we conducted a one-year multi-compartment and multi-parameter field study to investigate some aspects of the surrounding environment of oysters that could explain their metal bioaccumulation. Sediment, seawater (through punctual and passive sampling), particles (suspended particulate material of selected sizes, including trophic resources for oysters) and transplanted oysters were regularly collected at two contrasted sites of the bay (i.e. under continental versus more oceanic influence). These matrices were characterised for their total Cu, zinc (Zn), nickel (Ni), cadmium (Cd) and lead (Pb) concentrations. Several physico-chemical and biological parameters (e.g. &lt;/span&gt;&lt;/span&gt;salinity, particle loads, oyster growth rate and condition indices, carbon and nitrogen &lt;/span&gt;stable isotope compositions, etc.) were also analysed. Overall, sediment, particles and oysters from the outermost site had slightly lower δ&lt;/span&gt;&lt;sup&gt;13&lt;/sup&gt;&lt;span&gt;&lt;span&gt;C values, confirming the more oceanic influence in this part of the bay. Among organic particles, although dinoflagellates tended to be more abundant at the outermost site while ciliates were more abundant at the innermost site of the bay, the two sites did not differ in mean total microphytoplankton and diatom densities. However, the variations observed for most of the other parameters studied show that oysters located near the continental shore are exposed to higher loads of particles in general, and to higher metal contents in the dissolved phase and “bulk” seawater (dissolved plus particulate phases) during the year. While fluvial inputs and continental/urban run-offs are suspected sources of anthropogenic metal inputs into the bay, (fine) sediment particle &lt;/span&gt;resuspension&lt;span&gt;&lt;span&gt; appears to be a likely major contributor to metal release and hence to the contamination of the bay including oysters. The decline of seagrass beds in the last two decades in the bay could also have decreased the potential of fine particle retention in the sedimentary stratum. Concomitantly, oysters presenting the highest &lt;/span&gt;metal concentrations&lt;span&gt; were those with the lower growth rates and condition indices, which may be induced by physical constraints, high amounts of pseudo-faeces produced and/or reduced food and energy acquisition by oysters due to high particle loads in the water column. The findings of this study imply that using raw metal concentrations in bivalves to monitor marine coastal contamination can lead to misleading interpretations if potentially great spatial variations in b","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"234 ","pages":"Article 103778"},"PeriodicalIF":2.8,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43051629","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":"Spatio-temporal variation of Dissolved Organic Matter (DOM) in the Bohai Sea and the Yellow Sea","authors":"Xuan Ji ,&nbsp;Ke Liu ,&nbsp;Qing-Qing Zhu ,&nbsp;Jing Zhang ,&nbsp;Gui-Peng Yang","doi":"10.1016/j.jmarsys.2022.103777","DOIUrl":"10.1016/j.jmarsys.2022.103777","url":null,"abstract":"<div><p><span><span><span>The seasonal and spatial variations of dissolved organic carbon (DOC), chromophoric </span>dissolved organic matter (CDOM), and fluorescent dissolved organic matter (FDOM) were evaluated in the Bohai Sea (BS) and the Yellow Sea (YS) during three cruises. Two fluorescence components, such as marine humic-like (C1) and visible humic-like (C2), were identified using excitation-emission matrix </span>fluorescence spectroscopy (EEMs) and parallel factor analysis (PARAFAC). The average values of DOC concentration, CDOM absorption coefficient (</span><em>a</em>_CDOM(355)) and fluorescence component intensities (C1 and C2) were significantly higher in the BS (2.14 mg C L⁻¹, 0.77 m⁻¹, 0.035 RU, 0.026 RU, respectively) than those in the YS (1.55 mg C L⁻¹, 0.50 m⁻¹, 0.025 RU, 0.019 RU, respectively). The average DOC value was highest in winter (2.16 mg C L⁻¹) and lowest in spring (1.62 mg C L⁻¹), while <em>a</em>_CDOM(355) was the opposite (winter: 0.45 m⁻¹; spring: 0.62 m⁻¹; summer: 0.58 m⁻¹<span>). The average C1 (0.042 RU) and C2 (0.028 RU) values were highest during the winter and summer respectively, and lowest during spring (C1: 0.024 RU; C2: 0.016 RU). DOC and CDOM were mainly derived from terrestrial input, during the winter and spring, while they were primarily derived from phytoplankton<span> production during the summer. C1 and C2 were not correlated with salinity or chlorophyll </span></span><em>a</em> during the three seasons. The SUVA₃₅₅<span> values generally decreased with increasing salinity during the spring and summer, indicating that sources and sinks of CDOM and DOC were uncoupled. DOC, CDOM, and FDOM were dominated by terrestrial input and phytoplankton production activities and their spatial distributions and seasonal variations were also affected by currents, microbial activities, and photobleaching.</span></p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"234 ","pages":"Article 103777"},"PeriodicalIF":2.8,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46748321","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":"Iron and light limitation of phytoplankton growth off East Antarctica","authors":"Clara R. Vives ,&nbsp;Christina Schallenberg ,&nbsp;Peter G. Strutton ,&nbsp;Karen J. Westwood","doi":"10.1016/j.jmarsys.2022.103774","DOIUrl":"10.1016/j.jmarsys.2022.103774","url":null,"abstract":"<div><p><span>Phytoplankton<span><span> production controls the transfer of carbon dioxide from the atmosphere into the ocean through the biological carbon pump, facilitating the sequestration of carbon dioxide and thus, contributing to the regulation of global climate. In the Southern Ocean, a high-nutrient low-chlorophyll region, productivity is limited by micronutrients including iron. The limiting role of light is also important, especially in the context of Southern Ocean phytoplankton adaptation to the low-iron conditions. To investigate the relative dominance of iron and light limitation on phytoplankton growth, we conducted a series of incubation experiments during a 2019 summer research voyage off East </span>Antarctica. Our results show that, while light was the primary limiting factor of phytoplankton growth, iron addition became favourable for growth under high light conditions. This supports similar findings from laboratory (</span></span><span>Strzepek et al., 2019</span>) and field experiments in the Ross Sea (<span>Alderkamp et al., 2019</span>) and provides a new insight from a different region of the Southern Ocean, at a later stage of the austral summer. Similar results have previously been documented in larger diatoms, and here we provide evidence that it is also true for smaller cells. Our findings add to the body of knowledge regarding iron and light limitation in the Southern Ocean, in a poorly sampled area, leading to a better understanding of how primary production will change in a future warming ocean.</p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"234 ","pages":"Article 103774"},"PeriodicalIF":2.8,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46525521","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":"Flocculation of suspended particles during estuarine mixing in the Changjiang estuary-East China Sea","authors":"Yue Ming,&nbsp;Lei Gao","doi":"10.1016/j.jmarsys.2022.103766","DOIUrl":"10.1016/j.jmarsys.2022.103766","url":null,"abstract":"<div><p><span>Flocculation, triggered during estuarine mixing plays an important role in land-to-sea interactions and is a fundamental topic in near-shore oceanographic studies. Identifying </span><em>in situ</em><span> flocculation in large-river estuaries<span> can be challenging due to the complex seawater circulation and heterogeneous suspended particulate matter (SPM) composition in these areas. In this study, three cruises were conducted in the Changjiang (Yangtze) River Estuary and the adjacent area in March, May, and July 2016. Vertical profiles of SPM total volume, mean size, and size spectra were determined using laser </span></span><em>in situ</em><span> scattering and transmissometry (LISST) measurements at 66–89 stations during the three cruises. Stable isotopic ratios of δ</span>¹³<span>C were also measured in the organic carbon contents of SPM collected at the surface, middle, and bottom layers of the sampling stations. LISST data were used to successfully identify the flocculation occurring in the field as well as to trace SPM size spectrum changes before and after the flocculation process. The δ</span>¹³<span>C values were utilized to study the response of biogeochemical parameters to the flocculation. Phytoplankton blooms occurring in May largely resulted in discontinuous variations in LISST parameters and δ</span>¹³C from March to July. Although the pattern of SPM size spectra involved in flocculation differed among seasons, flocculation processes were always contributed by smaller particles with sizes of several tens of μm aggregating into larger ones &gt;300 μm. Using LISST and δ¹³C measurements combined greatly improved our understanding of SPM dynamics in estuarine and coastal areas where estuarine flocculation was a critical component.</p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"233 ","pages":"Article 103766"},"PeriodicalIF":2.8,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42048641","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}