Journal of Marine Systems最新文献

{"title":"Sediment accumulation rates and particle mixing at northwestern Pacific seamounts","authors":"Yuki Ota ,&nbsp;Masahiro Suzumura ,&nbsp;Ayumi Tsukasaki ,&nbsp;Atsushi Suzuki ,&nbsp;Koji Seike ,&nbsp;Jumpei Minatoya","doi":"10.1016/j.jmarsys.2022.103719","DOIUrl":"10.1016/j.jmarsys.2022.103719","url":null,"abstract":"<div><p><span>Cobalt-rich ferromanganese crusts are present on seamount<span> summits throughout the northwestern Pacific at water depths of approximately 1000 to 2500 m, where they are often associated with unconsolidated sediments. Sedimentation rates at the summits of seamounts calculated from ages </span></span>¹⁴C were 0.61 to 2.05 cm kyr⁻¹<span>, higher than those of the surrounding abyssal plain. Sediments at seamount summits consist almost entirely of carbonate, which may contribute to higher sedimentation rates at summits than at seamount feet, which are below the carbonate compensation depth. The shallowest mixing layer depth and the smallest particle mixing coefficient (estimated from </span>²¹⁰<span>Pb data) at the summit areas than at the foot of seamounts; suggest a weak bioturbation<span> activity in the peaks. The difference in bottom-water dissolved oxygen and particulate organic matter concentrations between the summits and feet of the seamounts in the northwestern Pacific may contribute to this difference in bioturbation activity.</span></span></p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"229 ","pages":"Article 103719"},"PeriodicalIF":2.8,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46172645","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 variability of turbid freshwater plumes in the Inner Sea of Chiloé, northern Patagonia","authors":"Raúl P. Flores ,&nbsp;Carlos Lara ,&nbsp;Gonzalo S. Saldías ,&nbsp;Sebastián I. Vásquez ,&nbsp;Alonso Roco","doi":"10.1016/j.jmarsys.2022.103709","DOIUrl":"10.1016/j.jmarsys.2022.103709","url":null,"abstract":"<div><p><span><span>Northern Patagonia is characterized by multiple rivers that discharge considerable amounts of freshwater into the coastal ocean, forming large river plumes that influence hydrographic and ecological processes. In this study, we use </span>satellite ocean<span><span> color data from MODIS (Moderate Resolution Imaging Spectroradiometer) to characterize the seasonal and interannual variability of turbid freshwater plumes in the inner waters of northern Patagonia for the first time, with a focus on the connections to river discharge and large-scale climatic variability. The turbidity<span> signal from the surface reflectance product centered at 645 nm, Rrs(645), correlates well with peaks in river discharge data and surface </span></span>salinity minima from boat-based profiles and a surface buoy, validating its use for the identification of turbid river plumes in the region. The seasonal climatology of Rrs(645) showed the presence of large river plumes throughout the year, with variability associated mainly to that of river discharge. Analysis of Rrs(645) fields under low and high discharge conditions allowed for the identification of a threshold value to delineate plume fronts and determine the probability of plume occurrence. </span></span>EOF analysis<span><span> reveals the dominant modes of plume variability, associated to turbidity differences between the coastal margin and deeper waters and to in-phase variability of large river plumes throughout the study area. The largest plume event occurred in year 2008, during negative (cold) phases of ENSO (La Niña) and </span>PDO but a positive phase of SAM. The severe drought event of 2016 that occurred during positives phase of ENSO (El Niño), PDO and SAM is well captured by the EOF analysis and is characterized by large negative anomalies in the Rrs(645) signal. In general, complex co-variations are observed between monthly anomalies of Rrs(645) and the ENSO, PDO and SAM indices, highlighting the heterogeneity of climatic regulation in the region.</span></p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"228 ","pages":"Article 103709"},"PeriodicalIF":2.8,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46307863","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":"Origin and fate of long-chain polyunsaturated fatty acids in the Kerguelen Islands region (Southern Ocean) in late summer","authors":"Marine Remize ,&nbsp;Frédéric Planchon ,&nbsp;Ai Ning Loh ,&nbsp;Fabienne Le Grand ,&nbsp;Antoine Bideau ,&nbsp;Eleonora Puccinelli ,&nbsp;Aswani Volety ,&nbsp;Philippe Soudant","doi":"10.1016/j.jmarsys.2021.103693","DOIUrl":"10.1016/j.jmarsys.2021.103693","url":null,"abstract":"<div><p><span><span>Long-chain polyunsaturated fatty acids (LC-PUFA) are molecules produced at the basis of marine food webs and essential for ecosystem functioning. This study reports detailed fatty acid (FA) composition including the two LC-PUFA 20:5n-3 and 22:6n-3, in suspended organic matter (SPOM) from the upper 300 m collected in the Kerguelen Island region in the Southern Ocean<span><span> during the post-bloom period (February–March 2018; project MOBYDICK). FA profiles were largely dominated by PUFA (53–69% of Total Fatty Acid, TFA) regardless of stations and among PUFA, proportions of LC-PUFA were especially high, making up 27–44% of TFA both in the ML and upper mesopelagic. 20:5n-3 and 22:6n-3 co-occurred in the ML as a result of the post-bloom </span>phytoplankton community showing a mixed composition dominated by small size phytoplankton (prymnesiophytes and prasinophytes) supplying 22:6n-3, and with diatoms in lower proportions supplying 20:5n-3. Elevated levels of LC-PUFA were observed both inside the iron-fertilized area on the Kerguelen Plateau and downstream, and outside in High Nutrient Low Chlorophyll waters located upstream of the Plateau, and appeared unrelated to site. In the upper mesopelagic, both LC-PUFA were maintained at high relative proportions suggesting an efficient and possibly fast vertical transfer from the surface. Transfer with depth seems to proceed via distinct pathways according to LC-PUFA. 20:5n-3 may be exported along with diatoms, presumably in the form of large intact cells, aggregates as well as </span></span>resting spores<span>. For 22:6n-3, transfer may involve a channeling through the heterotrophic food web resulting in its association with fecal material at depth. Channeling of 22:6n-3 could involve heterotrophic protists such as </span></span>dinoflagellates<span> and ciliates grazing on small phytoplankton, as well as larger zooplankton such as copepods and salps, possibly feeding on microzooplankton and producing fecal pellets rich in 22:6n-3. According to LC-PUFA content, SPOM present throughout the upper water column (0–300 m) appeared of high nutritional quality both on- and off-plateau, and represented a valuable source of food for secondary consumers and suspension feeders.</span></p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"228 ","pages":"Article 103693"},"PeriodicalIF":2.8,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44187496","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":"Exploring cosmopolitan jellyfish (Aurelia spp.) bloom dynamics and ecological implications in subtropical waters with mechanistic dynamic modeling","authors":"Chengxue Li,&nbsp;Hui Liu","doi":"10.1016/j.jmarsys.2022.103705","DOIUrl":"https://doi.org/10.1016/j.jmarsys.2022.103705","url":null,"abstract":"<div><p><span>Worldwide massive outbreaks of gelatinous zooplankton have drawn much attention to seeking relevant mechanisms and processes for better management and conservation of ocean ecosystems. In the present study, we developed an individual-based model (IBM) for cosmopolitan jellyfish </span><em>Aurelia</em><span> spp., which incorporates a fully coupled pelagic-benthic life cycle with fine-scaled (0.5° × 0.5°) dynamic ocean conditions to examine the spatio-temporal population dynamics of the species in the northern Gulf of Mexico<span> (GoM) from 1995 to 2010. Model simulations highlighted the significant bottom-up effect of environmental conditions in triggering strobilation and subsequent jellyfish blooms. Dynamics of jellyfish populations exhibited large variability in time and space over the northern GoM continental shelf. Simulation results showed that the South Texas coast, the East Louisiana shelf, and the Mississippi Sound were potential bloom hotspots with distinctive driving processes. A case study of the Mississippi Sound region in 2008 revealed a mismatch of bloom timing whether defined as abundance or biomass, which spotlighted the need to further assess the consequence and ecological implication of jellyfish outbreaks to the biomass and energy flows in the ocean. Given that the GoM is vulnerable to jellyfish blooms, findings of this study contribute to the improved understanding of mechanisms and processes of jellyfish blooms with predictions of the status, trend, and hotspots of jellyfish population dynamics under variable environmental conditions and a changing climate.</span></span></p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"228 ","pages":"Article 103705"},"PeriodicalIF":2.8,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71865867","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":"Potential combined impacts of climate change and non-indigenous species arrivals on Bay of Biscay trophic network structure and functioning","authors":"M. Le Marchand ,&nbsp;F. Ben Rais Lasram ,&nbsp;E. Araignous ,&nbsp;B. Saint-Béat ,&nbsp;G. Lassalle ,&nbsp;N. Michelet ,&nbsp;S. Serre ,&nbsp;G. Safi ,&nbsp;M. Lejart ,&nbsp;N. Niquil ,&nbsp;F. Le Loc'h","doi":"10.1016/j.jmarsys.2022.103704","DOIUrl":"10.1016/j.jmarsys.2022.103704","url":null,"abstract":"<div><p><span>The consequences of climate change for marine organisms are now well-known, and include metabolism and behavior modification, distribution area shifts and changes in the community. In the Bay of Biscay, the potential environmental niches of subtropical non-indigenous species (NIS) are projected to expand as a response to sea temperature rise by the mid-century under the RCP8.5 climate change scenario. In this context, this study aims to project the combined effects of changes in indigenous species distribution and metabolism and NIS arrivals on the functioning of the Bay of Biscay trophic network. To do this, we created six different Ecopath food web models: a “current situation” trophic model (2007–2016) and five “future” trophic models. The latter five models included various NIS biomass combinations to reflect different potential scenarios of NIS arrivals. For each model, eight Ecological Network Analysis (ENA) indices were calculated, describing the properties of the food web resulting from the sum of interactions between organisms. Our results illustrate that rising temperature increases the quantity of energy passing through the system due to increased productivity. A decrease in the biomass of some trophic groups due to the reduction of their potential environmental niches also leads to changes in the structure of the trophic network. The arrival of NIS is projected to change the fate of organic matter within the ecosystem, with higher cycling, relative ascendency, and a chain-like food web. It could also cause new trophic interactions that could lead to competition and thus modify the food-web structure, with lower omnivory and higher </span>detritivory. The combined impacts (increasing temperatures and NIS arrivals) could lower the resilience and resistance of the system.</p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"228 ","pages":"Article 103704"},"PeriodicalIF":2.8,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41564315","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":"Formation of a subsurface anticyclonic eddy from the California Undercurrent off northwestern Baja California, Mexico","authors":"David Rivas ,&nbsp;Andrea Mitre-Apaez ,&nbsp;Ernesto García-Mendoza","doi":"10.1016/j.jmarsys.2022.103707","DOIUrl":"10.1016/j.jmarsys.2022.103707","url":null,"abstract":"<div><p>Hydrographic observations off northwestern Baja California in March 2017 revealed the presence of a subsurface anticyclonic eddy in a cross-shelf transect at <span><math><mrow><mo>∼</mo><mn>32</mn><mo>°</mo></mrow></math></span><span>N. This eddy’s width was roughly 30 km and it was located about 15 km from the shelf, at depths between 100 m and 400 m. The eddy’s core had hydrographic characteristics consistent with those found in the California Undercurrent (CUC), which suggests that the eddy was originated in the CUC. Numerical-modeling simulations were used to elucidate the origin and evolution of the observed eddy. These simulations also showed a subsurface eddy which crossed the cross-shelf transect’s location with size, depth, and hydrographic characteristics similar to those of the observed eddy (but formed in November 2007, in a simulation for the 2004–2011 period). Thus, this numerical eddy is considered as analogous to the observed one, hence the life cycle is assumed to be the same in both cases. The eddy formation occurred roughly 40 km southeast of the cross-shelf transect, in a zone characterized by a submarine point, where the isobaths change their orientation abruptly and where an enhanced eddy-energy production occurs, which shows that the irregular bottom-topography is a factor that triggered such an eddy formation. The eddy formed in a period of weak along-shelf velocities, 4-10 days after an event of the most intense velocities of the year, associated with the passage of a wind-driven coastal trapped wave generated in remote locations south of the study area. The flow disturbances forced by this wave could be an additional physical factor which predisposes the water column to instability. However, at least in the cases herein analyzed, the eddy separation required an additional momentum/vorticity input by an adjacent mesoscale cyclonic gyre. Comparison with numerical and laboratory–experimental results support the notion that a baroclinic instability process is involved in the eddy generation. The path followed by the subsurface eddy described herein shows a link of the hydrographic characteristics between northwestern Baja California and the Southern California Bight.</span></p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"228 ","pages":"Article 103707"},"PeriodicalIF":2.8,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47662036","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":"TITLE coastal upwelling along the Uruguayan coast: Structure, variability and drivers","authors":"Camila de Mello, M. Barreiro, L. Ortega, R. Trinchin, G. Manta","doi":"10.1016/j.jmarsys.2022.103735","DOIUrl":"https://doi.org/10.1016/j.jmarsys.2022.103735","url":null,"abstract":"","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49054092","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":"Phytoplankton biomass dynamics in the Arabian Sea from VIIRS observations","authors":"Wei Shi ,&nbsp;Menghua Wang","doi":"10.1016/j.jmarsys.2021.103670","DOIUrl":"10.1016/j.jmarsys.2021.103670","url":null,"abstract":"<div><p>Using chlorophyll-a (Chl-a) as an indicator for phytoplankton biomass, observations from the Visible Infrared Imaging Radiometer Suite (VIIRS) onboard the Suomi National Polar-orbiting Partnership (SNPP) between 2012 and 2019 in combination with wind, various ocean hydrographic data, and nutrient data are used to conduct a comprehensive study to characterize and quantify the phytoplankton biomass dynamics in the Arabian Sea, and assess the mechanisms that drive the summer and winter phytoplankton blooms. Phytoplankton biomass dynamics in the Arabian Sea are driven by the seasonal reversal of the monsoon wind. The summer phytoplankton bloom located mainly in the western and central Arabian Sea is stronger than the winter phytoplankton bloom in the northern Arabian Sea in terms of both Chl<em>-</em>a values and the extent of phytoplankton bloom coverage. Interannual variability of Chl<em>-</em>a is less significant in comparison to the seasonal variability. Chl-a data measured by the Sea-viewing Wide Field-of-View Sensor (SeaWiFS) from 1997 to 2010 are also used. The comparison of Ch-a climatology data between SeaWiFS and VIIRS shows no long-term trend of Chl-a change in the Arabian Sea. This study provides an improved understanding (with new knowledge) of (1) phytoplankton biomass dynamics, (2) physical, biological, and biogeochemical processes, and (3) nutrient dynamics in the Arabian Sea. The hydrographic and nutrient data reveal two different driving mechanisms for phytoplankton blooms in the summer and winter monsoons. During the summer monsoon, the cold high-nutrient waters are brought to the surface from the thermocline depth through strong coastal upwelling and Ekman pumping, leading to increased Chl-a at the surface-layer. The vertical velocity reaches ~1 m/day at 70 m depth. In comparison, the winter phytoplankton bloom is driven by the moderate boost of the nutrient level due to the mixed-layer deepening and strong vertical mixing caused by the surface cooling in the northern Arabian Sea. The nutrient dynamics in the Arabian Sea also suggests that the nitrate concentration is the major nutrient driver for its seasonal phytoplankton biomass dynamics.</p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"227 ","pages":"Article 103670"},"PeriodicalIF":2.8,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0924796321001640/pdfft?md5=74ee0cda13c8ebe49aa7bf5a6ccb12be&pid=1-s2.0-S0924796321001640-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49495346","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":"Sinking velocity of small particles in the Black Sea: Vertical distribution and seasonal variability from continuous Bio-Argo measurements of backscattering","authors":"A.A. Kubryakov,&nbsp;S.V. Stanichny","doi":"10.1016/j.jmarsys.2021.103695","DOIUrl":"10.1016/j.jmarsys.2021.103695","url":null,"abstract":"<div><p>High-resolution Bio-Argo measurements of backscattering (<em>bbp</em><span>) were used to study the vertical distribution and time variability of the sinking of small, highly reflective particles in the Black Sea in the 0–200 m layer. The evolution of particles is divided into three stages: formation, sinking, and removal. The formation of small, highly reflective particles is mainly related to early summer and early winter coccolithophore blooms and the formation of suspended oxidized manganese in the suboxic zone. The removal rate of the particles was estimated from the vertical distribution of </span><em>bbp</em> in relation to its values at the layers of particle formation. Further, contour analysis of the time-depth diagram of <em>bbp</em> anomalies was used to automatically estimate the vertical distribution and seasonal and interannual variability of sinking velocity (<em>w</em>). The average value of <em>w</em><span> is ~0.8 m/day, which agrees with laboratory estimates of coccolith sinking (</span><span>Fritz and Balch, 1996</span>). Physical processes significantly affect <em>w</em>: mixed layer deepening in late autumn-early winter increase <em>w</em> up to 1–1.5 m/day; warming and a decrease in density of upper layers promote coccolithophores deepening in summer (<em>w</em><span> = 0.9–1.1 m/day). Minimum sinking velocity is observed in the warm period of a year in the strongly stratified layers of the main pycnocline at 40–80 m. On interannual time scales, we observed an increase in </span><em>w</em><span> during the strongest coccolithophore blooms, which is probably related to the enhanced particle aggregation. Sinking particles after winter coccolithophore blooms are traced up to the suboxic zone, where it probably affects the settling of manganese-containing particles and related biochemical processes.</span></p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"227 ","pages":"Article 103695"},"PeriodicalIF":2.8,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42218654","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":"Oceanographic and human impacts on the compositions of sedimentary organic matter along the southern coast of Zhoushan","authors":"Stephanie Parker ,&nbsp;Xue-Gang Chen ,&nbsp;Pei Sun Loh ,&nbsp;Shuangyan He ,&nbsp;Ai-Min Jin ,&nbsp;Jianru Zhao ,&nbsp;Zhongqiao Li ,&nbsp;Jianfang Chen ,&nbsp;Yuxia Sun ,&nbsp;Jiawang Chen","doi":"10.1016/j.jmarsys.2021.103681","DOIUrl":"10.1016/j.jmarsys.2021.103681","url":null,"abstract":"<div><p><span>Three sediment cores were collected from the southern coastal area of Zhoushan Island, and their lignin-derived phenol, bulk elemental composition, stable carbon isotope, particle size and </span>²¹⁰<span><span>Pb activities were determined. The objective of this study was to determine the compositional changes of the sedimentary organic matter along this coastal area in the past 80 years as a result of anthropogenic and oceanographic-related processes. The results of this study showed that the sources and distribution of sedimentary organic matter along this coastal area were affected by the accelerated development on these islands and mainland China. Moreover, the increased contribution of terrestrial organic matter from the rivers in the mainland from the 1930s to the 1980s was likely the result of human activities. The drastic increase in the vanillic acid to vanillin ratio, (Ad/Al)v, in the 1970s and 1980s coincided with the start of rapid development in Zhoushan, resulting in the increased erosion of more degraded terrestrial organic matter along the coast. Trends of increasing marine organic matter toward the present could be due to a combination of reduced river input and sea level rise. Overall, our results showed that the sedimentary organic matter along the southern coastal zone of Zhoushan main island was affected by riverine input from the mainland, and showed a tendency toward decreasing terrestrial organic matter and particle size. Thus, local input and increased </span>phytoplankton production will play a more important role in the carbon dynamics in this coastal area in the future. (245 words).</span></p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"227 ","pages":"Article 103681"},"PeriodicalIF":2.8,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49340752","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}