Journal of Marine Systems最新文献

{"title":"Dynamic changes of dissolved organic matter in surface water off the Northern Antarctic peninsula during summers of 2018–2020","authors":"Yasong Wang ,&nbsp;Jianchun Yu ,&nbsp;Guoping Zhu ,&nbsp;Sisong Dong ,&nbsp;Jiuyang Zhu ,&nbsp;Dehui Qiao ,&nbsp;Lixia Guo ,&nbsp;Shengjie Ye ,&nbsp;Yunping Xu","doi":"10.1016/j.jmarsys.2025.104083","DOIUrl":"10.1016/j.jmarsys.2025.104083","url":null,"abstract":"<div><div>The Southern Ocean, the region with the strongest carbon sink in global ocean, is sensitive to climate warming. Dissolved organic matter (DOM) is the largest reduced carbon reservoir in ocean and serves many crucial functions in marine ecosystems. Therefore, it is important for understanding the dynamics and response of DOM in the Southern Ocean in the context of climate warming. In this study, we investigated DOM in surface water off the Northern Antarctic peninsula (NAP) during the austral summers of 2018, 2019, and 2020 using elemental analysis, optical spectrometry, and high-resolution mass spectrometry. The results revealed a continuous increase in dissolved organic carbon (DOC) concentration from 2018 to 2020 (43.1 ± 12.7 vs. 60.2 ± 23.0 vs. 72.6 ± 24.5 μmol C L⁻¹), while chromophoric DOM concentration showed an opposite trend. Multiple optical parameters suggested that samples in 2018 had the lowest biological activity, highest humidification degree and more aromatic components, whereas samples in 2020 had the highest biological activity, the lowest humidification degree and more protein-like components. The significant correlations between DOM parameters and environmental factors (e.g., temperature, Chl-a) indicate that the variations in DOM within the NAP are a result of the complex biogeochemical processes in the Southern Ocean, influenced by factors such as sea ice melting, ocean acidification, shifts in zooplankton populations, and biological activity. Considering only the three years of data presented in this study, we recommend conducting long-term investigations into DOM in the Southern Ocean</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"250 ","pages":"Article 104083"},"PeriodicalIF":2.7,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144239462","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":"Pathways of organic carbon mineralization and benthic fluxes of alkalinity and dissolved inorganic carbon in sediments of large inland seas: The Bohai Sea and North Yellow Sea","authors":"Jian-Hua Ren,&nbsp;Mao-Xu Zhu,&nbsp;De-Yan Wang,&nbsp;Qing-Qing Li,&nbsp;Tie Li","doi":"10.1016/j.jmarsys.2025.104082","DOIUrl":"10.1016/j.jmarsys.2025.104082","url":null,"abstract":"<div><div>Shallow inland seas are sensitive to benthic-pelagic coupling and susceptible to anthropogenic perturbations. In the sediments, organic carbon (OC) mineralization-driven diagenetic cycling and benthic-pelagic coupling are impacted by numerous intricate factors, many of which have not been well documented. In this study, conventional geochemical measurements and multicomponent-coupled diagenetic modeling are combined to quantitatively investigate the partitioning of OC mineralization among individual electron acceptors in sediments of two large inland seas: the Bohai Sea (BHS) and the North Yellow Sea (NYS). We then estimate OC transfer efficiency in the sediments and benthic fluxes of dissolved inorganic carbon (DIC) and total alkalinity (TA). Modeling results suggest that the reactivity of sedimentary OC is 1–3 orders of magnitude lower than the most commonly observed values, indicating overall low degradability of OC. Depth-integrated OC mineralization rates over a 20-cm depth are 3.4 and 2.4 mmol m⁻² d⁻¹ on average in the BHS and NYS sites, respectively, with aerobic respiration as the most important pathways (mean: 54 %), followed by sulfate reduction (mean: 24 %). Dissimilatory iron reduction (DIR), dissimilatory manganese reduction (DMR), and denitrification combined contribute only 16 %–33 % of OC mineralization. Sedimentation rate, rather than OC mineralization rate, is the primary control of OC transfer efficiency in the sediments. Consequently, high sedimentation rates in the BHS result in much higher OC transfer efficiency (mean: 78 %) over the 20-cm depth of the sediment compared to that in the NYS (mean: 34 %). Albeit covering a relatively small area, these two inland seas represent hotspots of OC burial. Our estimates of benthic fluxes suggest that benthic exports of DIC and TA may play an important role in benthic-pelagic coupling in these seas. Contrasting TA/DIC flux ratios imply that benthic TA export may mitigate bottom-water acidification in the BHS but exacerbate the acidification in the NYS.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"250 ","pages":"Article 104082"},"PeriodicalIF":2.7,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144212066","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":"Three-dimensional structures of mesoscale eddies in the subtropical countercurrent and Kuroshio extension regions and their vertical normal modes analysis","authors":"YunLong Shi","doi":"10.1016/j.jmarsys.2025.104080","DOIUrl":"10.1016/j.jmarsys.2025.104080","url":null,"abstract":"<div><div>This study investigates the three-dimensional structures of temperature, salinity, density, and pressure anomalies of cyclonic and anticyclonic eddies in the Subtropical Countercurrent (STCC) and Kuroshio Extension (KE) regions using composite analysis and vertical normal modes methods. The results show that maximum temperature and density anomalies in the upper mixed layer are displaced westward for cyclonic eddies and northwestward for anticyclonic eddies relative to the eddy center, while anomalies below the mixed layer display quasi-isotropic structures. Sea surface salinity anomalies are shifted northwest of the eddy center and exhibit a dual-core vertical structure influenced by the background salinity field. In both the KE and STCC regions, anticyclonic eddies cause greater maximum temperature and salinity anomalies but at shallower depths compared to cyclonic eddies. Analysis of pressure anomalies reveals that eddy vertical structures are surface-intensified in the STCC region, with an average influence depth of 508 m, but extend deeper in the KE region, with an average influence depth of 613 m. Cyclonic eddies generally penetrate deeper than anticyclonic eddies. The vertical structure of eddies is dominated by the barotropic mode and the first baroclinic mode, with the first two modes accounting for 80 % of the variability. Contributions of the barotropic mode increase from the STCC to the KE region, with cyclonic eddies having higher barotropic mode ratio than anticyclonic eddies. The vertical influence depth of eddies is largely determined by the barotropic component, with greater barotropic contributions corresponding to deeper penetration.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"250 ","pages":"Article 104080"},"PeriodicalIF":2.7,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144185778","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 reconstruction of Antarctic Sea ice extent since the 1950s from a snowpit methanesulfonate (MSA) record in East Antarctic inland","authors":"Jinhai Yu ,&nbsp;Hongxi Pang ,&nbsp;Guitao Shi ,&nbsp;Wangbin Zhang ,&nbsp;Shuangye Wu ,&nbsp;Chunlei An ,&nbsp;Yuansheng Li ,&nbsp;Shugui Hou","doi":"10.1016/j.jmarsys.2025.104081","DOIUrl":"10.1016/j.jmarsys.2025.104081","url":null,"abstract":"<div><div>Antarctic sea ice plays a crucial role in regulating regional and global climate, as well as ecosystem productivity of the Southern Ocean. Since sea ice data were rare before 1978C.E., reconstruction of past sea ice conditions is of vital importance for understanding their impact on past climate change. Methanesulfonate (MSA) in Antarctic ice cores is considered a potential proxy of sea ice extent (SIE). In this study, we tested this approach by measuring the variations of MSA flux (1950–2016C.E.) in samples collected from a snowpit at Dome A, the summit of Eastern Antarctic ice sheet, and investigating its relationship with the SIE in the Southern Ocean. The result shows a significant and positive correlation between the MSA flux and the observed mean SIE in the Indian Ocean sector of the Southern Ocean from 1979 to 2016C.E. In addition, our study shows that the MSA is mainly influenced by Southern Hemisphere westerly winds (zonal winds) and katabatic winds (flowing from inland to the coast). Enhanced winds in both systems promote sea ice production in the Southern Ocean. These wind systems significantly influence the MSA cycle, stronger westerlies and katabatic winds increase MSA production, whereas meridional winds facilitate the transport and subsequent deposition of MSA at Dome A. Our findings suggest that MSA recorded in snow from Dome A could serve as a reliable proxy or reconstruction for mean SIE. Consequently, MSA in deep ice cores from Dome A offers a valuable archive for investigating past sea ice conditions in the Indian Ocean sector of the Southern Ocean, biogenic sulfur, and their climatic impacts.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"250 ","pages":"Article 104081"},"PeriodicalIF":2.7,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144185780","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":"Hierarchical approach to communities' ecological classification and mapping: Application to northeastern Black sea macrozoobenthos","authors":"Vitaly L. Syomin ,&nbsp;Galina A. Kolyuchkina ,&nbsp;Ivan V. Lyubimov ,&nbsp;Alexander B. Basin ,&nbsp;Vadim Yu. Fedulov ,&nbsp;Oleg I. Podymov ,&nbsp;Klim S. Grigorenko ,&nbsp;Ulyana V. Simakova ,&nbsp;Alexander G. Ostrovskii ,&nbsp;Vadim O. Mokievsky","doi":"10.1016/j.jmarsys.2025.104072","DOIUrl":"10.1016/j.jmarsys.2025.104072","url":null,"abstract":"<div><div>Recently, global climate change and environmental pollution led to changes in macrozoobenthic communities. Existing approaches to defining and mapping communities are extremely diverse. Consequently, assessment of both temporal changes and spatial variability depends greatly on the approach used. This paper proposes a three-level (ecological complex, biocenosis, subcenosis) hierarchical approach to classification of macrozoobenthos communities. <strong>Ecological complex</strong> is a species pool typical of a well-defined range of leading factors. Corresponding <strong>biocenoses</strong> are formed in specific biotopes from this pool; they have a characteristic species composition and a specific structure which result from joint actions of both biotic interactions and the habitat properties. Different <strong>subcenoses</strong> have a similar species composition and partially resembling quantitative structure; differences between biotopes inhabited by subcenoses of one biocenosis are minor or undetectable in practice. Proposed approach enhances combining and comparing datasets obtained by different methods. The paper focuses at the example of soft-bottom macrozoobenthos in the northeastern Black Sea shelf and slope. Two ecological complexes are identified in the study area. They are distinguished by temperature and salinity regimes in main water masses; their boundary coincides with the deepest position of the seasonal thermocline. Three biocenoses and eight subcenoses are described within these complexes. The differentiation of biocenoses and subcenoses within the ecological complexes is driven primarily by the sediment type and oxygen regime. The proposed approach is used to designate a base of level 5 in the EUNIS habitat mapping for the northeastern Black Sea shelf.</div></div><div><h3>Glossary</h3><div><strong>Community</strong> and <strong>biocoenosis</strong> in ecological studies can be used by various authors as synonyms or as terms with different meanings. Various authors described benthic fauna divisions of the Black Sea and Sea of Azov as biocenoses (Vorobyov, 1949), communities (Sezgin et al., 2010), or mixing the concepts (Chikina and Kucheruk, 2005). In the present work, these terms are adopted as synonyms, denoting the biological component of biogeocenosis according to (Sukachev, 1949).</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"250 ","pages":"Article 104072"},"PeriodicalIF":2.7,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144167459","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":"Spatial variability of turbulent mixing in a highly stratified system","authors":"Débora Barros ,&nbsp;Taylor Bailey ,&nbsp;Lauren Ross ,&nbsp;Carlos A.F. Schettini","doi":"10.1016/j.jmarsys.2025.104071","DOIUrl":"10.1016/j.jmarsys.2025.104071","url":null,"abstract":"<div><div>This study investigates the lateral variability of circulation, salt distribution, and mixing processes along the highly stratified, micro-tidal Rio Grande Channel, which connects the Patos Lagoon and the Atlantic Ocean. High-resolution observations of current velocities (ADCP), water properties (CTD), and turbulent kinetic energy dissipation (microstructure profiler) were collected at three cross-sections near the lagoon mouth. The field campaign was carried out during a period of seaward flow conditions, and the cross-sections capture conditions upstream of the salt intrusion limit (freshwater/vertically homogeneous), at the landward limit of salt intrusion (the tip of the salt wedge), and downstream of the salt intrusion (highly stratified). While lagoons are often considered shallow, well-mixed systems dominated by barotropic dynamics, our results revealed pronounced stratification, with baroclinic processes playing a central role. Secondary flows driven by baroclinic pressure gradients and acceleration due to curvature and Coriolis enhanced mixing in the cross-sections. Bottom-generated mixing was evident across all transects; however, vertical shear of the horizontal current velocities at the pycnocline emerged as the primary driving mechanism in the third (most-downstream) cross-section. Stratification suppressed mixing between upper and lower layers at the midstream and downstream cross-sections, with the pycnocline damping turbulence, yet showing elevated mixing immediately above and below its interface. Notably, despite a channel-funneling effect that increased flow velocity and shear toward the mouth, mixing did not intensify as expected due to the strong stratification. These findings are particularly relevant for understanding dynamics in other microtidal estuaries, especially in choked lagoons and constricted channels.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"250 ","pages":"Article 104071"},"PeriodicalIF":2.7,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144130854","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":"Will the declining sea ice extent in the Arctic cause a reversal of net benthic-pelagic exchange directions?","authors":"Saskia Rühl ,&nbsp;Charlotte E.L. Thompson ,&nbsp;Ana M. Queirós ,&nbsp;Joanne E. Hopkins ,&nbsp;Sian F. Henley ,&nbsp;Stephen Widdicombe","doi":"10.1016/j.jmarsys.2025.104067","DOIUrl":"10.1016/j.jmarsys.2025.104067","url":null,"abstract":"<div><div>In the Arctic, loss of sea ice due to climate change and the northward shift of the Polar Front are predicted to affect many ecosystem processes such as the ecologically important process of particulate and dissolved matter exchange between the seafloor and the water column. In this study, we show for the first time that a change from an ice-covered, Arctic water-dominated system to an Atlantic -dominated ice-free one is likely to reverse seafloor-water exchange directions. A north – south transect across the Barents Sea was studied over two years with differing sea ice cover conditions, recording biological, biogeochemical, hydrographic, geophysical, and oceanographic data. There was a clear difference between the direction and magnitude of key benthic-pelagic fluxes present at Atlantic-dominated environments, and those in Arctic water – dominated ones. Currently, the southern Barents Sea exhibits a net downward flux of dissolved matter and a net upward flux of particulates, while in the northern region solutes fluctuate upwards and particulates downward, making the North a more depositional region that promotes near-surface primary productivity. Broad scale assessments of net fluxes in rapidly changing ecosystems should be employed to monitor impacts of climate change and anthropogenic activities.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"249 ","pages":"Article 104067"},"PeriodicalIF":2.7,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916828","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":"Regionally distinct drivers of the carbonate system dynamics in the Drake Passage and northern Antarctic Peninsula","authors":"Lisandro A. Arbilla ,&nbsp;Celeste López-Abbate ,&nbsp;Laura A. Ruiz-Etcheverry ,&nbsp;Azul S. Gilabert ,&nbsp;Lucía C. Kahl ,&nbsp;Ana P. Osiroff","doi":"10.1016/j.jmarsys.2025.104070","DOIUrl":"10.1016/j.jmarsys.2025.104070","url":null,"abstract":"<div><div>The Drake Passage (DP) and the adjacent northern Antarctic Peninsula (NAP) are highly dynamic regions within the Southern Ocean where physical and biogeochemical processes simultaneously influence the CO₂ system. Ocean total alkalinity (A_T) and total dissolved inorganic carbon (C_T) serve as valuable early indicators of calcium carbonate undersaturation and help evaluate the buffering capacity of the ocean. However, significant uncertainty remains in predicting carbonate system dynamics in the DP and NAP due to a lack of seasonal representation and the spatial variability. To address this uncertainty, we identified factors affecting the carbonate system at a regional level using unprecedented surface data from two consecutive austral summer and early fall periods (February–April 2003 and 2004). The data revealed that the dynamics of A_T and C_T in the DP and NAP exhibited both conservative and non-conservative behaviors influenced by the position of the Polar Front (PF), and the proximity to land. In coastal regions, salinity and terrestrial influence were major determinants, while in oceanic regions, nutrients and phytoplankton productivity played a more prominent role. The position of the PF creates a latitudinal edge in nutrient ratios, establishing a new hierarchy of carbonate chemistry drivers where silicate gains prevalence toward the southern DP and NAP. The results highlight significant regional variability in the carbonate system, with increasing A_T and C_T from north to south, making NAP the most vulnerable region due to accelerated acidification and ice melt-growth. Susceptibility to ocean acidification and seasonal fluctuations in the carbonate system indicate a higher risk to calcareous structures in the southernmost region.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"249 ","pages":"Article 104070"},"PeriodicalIF":2.7,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144072070","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 scales of variability in Regions Of Freshwater Influence on the French continental shelf over two decades","authors":"Maud Martinez Almoyna ,&nbsp;Guillaume Charria ,&nbsp;Marc Sourisseau ,&nbsp;Anne Gaymard ,&nbsp;Xavier Couvelard ,&nbsp;Sébastien Theetten ,&nbsp;Jean-François Le Roux","doi":"10.1016/j.jmarsys.2025.104068","DOIUrl":"10.1016/j.jmarsys.2025.104068","url":null,"abstract":"<div><div>The Regions Of Freshwater Influence (ROFIs) are defined as the area on the continental shelf in the vicinity of estuaries, where freshwater from the river significantly influence water properties and circulation. These regions are subject to a variety of dynamic forcings, including tides, winds and river runoffs, which exhibit considerable variability. The objective of this study is to identify the dominant time scales of variability of the three major ROFIs (Seine, Loire, and Gironde) of the French continental shelf and their evolution over the last two decades. In order to address these questions, we developed a high-resolution numerical simulation of the physical dynamics of the Bay of Biscay and the English Channel. The results demonstrate that the three ROFIs oscillate on the same two cycles: the semidiurnal cycle, caused by tides, and the annual cycle, linked to the seasonal variation in runoff. At the weekly and monthly time scales, two contrasting dynamics emerge. The Seine ROFI, situated in the eastern English Channel, is predominantly influenced by tides and exhibits a third oscillatory cycle, namely the fortnightly cycle. In the Bay of Biscay, the Loire and Gironde ROFIs are more influenced by wind events that shape their monthly variations. The interannual variations are primarily driven by runoff, with an observed reduction in ROFIs extension over the twenty years simulated correlated with a decrease in runoff. However, the combination of shorter timescale events impacts the interannual variability, leading to years with distinctive dynamics of the ROFIs.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"249 ","pages":"Article 104068"},"PeriodicalIF":2.7,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144069304","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":"Light absorption properties and absorption budget of the Black Sea","authors":"Tanya Churilova ,&nbsp;Tatiana Efimova ,&nbsp;Nataliia Moiseeva ,&nbsp;Elena Skorokhod ,&nbsp;Olga Krivenko ,&nbsp;Vyacheslav Suslin","doi":"10.1016/j.jmarsys.2025.104069","DOIUrl":"10.1016/j.jmarsys.2025.104069","url":null,"abstract":"<div><div>This study is focused on bio-optical data collected from deep parts of the eastern and western Black Sea and the Crimean shelf waters during nineteen cruises of RV “Professor Vodyanitsky” carried out in different seasons in 2015–2022. Based on a long-term data set, a parameterization of light absorption by phytoplankton (<span><math><msub><mi>a</mi><mi>ph</mi></msub><mfenced><mi>λ</mi></mfenced></math></span>), non-algal particles (<span><math><msub><mi>a</mi><mi>NAP</mi></msub><mfenced><mi>λ</mi></mfenced></math></span>), and colored dissolved organic matter <span><math><msub><mi>a</mi><mi>CDOM</mi></msub><mfenced><mi>λ</mi></mfenced></math></span> was performed. Parameterization coefficients for phytoplankton absorption were revealed for all seasons. A two-fold difference was observed in the chlorophyll “a” specific light absorption coefficient of phytoplankton in the Black Sea between summer and winter seasons. The difference was related to the “pigment package effect” resulting in the self-shading of pigments caused by changes in intracellular pigment concentration and phytoplankton cell size due to adaptation of phytoplankton to the varying environmental factors. The use of seasonal-specific coefficients of parameterization of phytoplankton light absorption provides more accurate retrievals of <span><math><msub><mi>a</mi><mi>ph</mi></msub><mfenced><mi>λ</mi></mfenced></math></span> spectra based on the chlorophyll “a” concentration in modelling the light field and primary production using a spectral approach. The parameterization of CDOM light absorption and the revealed relationship between <span><math><msub><mi>a</mi><mi>CDOM</mi></msub><mfenced><mi>λ</mi></mfenced></math></span> and spectral slope (<em>S</em>_CDOM) allow one to correctly retrieve the <span><math><msub><mi>a</mi><mi>CDOM</mi></msub><mfenced><mi>λ</mi></mfenced></math></span> based on the CDOM light absorption coefficient at particular wavelength. This is applicable both for data from submersible probes and for satellite data. Accurately retrieved CDOM spectra allow more correct modelling of the light field in the sea, which is crucial for waters, where CDOM is the main optically active component. Empirically assessed spectral slope of NAP absorption and share of NAP in particulate absorption allow to differentiate CDOM and NAP based on values of their summary absorption, which can be applicable for remote sensing data interpretation. The light absorption budget reveals CDOM as the main optically active component in the Black Sea upper layer (first optical depth). The parameterization of light absorption by all optically active components can be used to refine regional models for assessing water quality and productivity indicators based on remote sensing information.</div></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"249 ","pages":"Article 104069"},"PeriodicalIF":2.7,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916830","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}