Journal of Marine Systems最新文献_第10页

Red Sea warming and its links to the Red Sea dipole and upwelling mechanisms 红海变暖及其与红海偶极子和上升流机制的联系

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Marine Systems

Pub Date : 2025-04-21 DOI: 10.1016/j.jmarsys.2025.104066

Ahmed M. El Kenawy , Mohammad Hadi Bordbar , Emad K. Mohamed , Mohamed M. Abdelaal , Beatriz Fernandez-Duque , Matthew F. McCabe , Mohamed El Alfy , Azza Ragab , Hosam Ismael , Shimaa Mebed , Sayed M. Robaa , Hassan Aboelkhair

A comprehensive analysis of changes in sea surface temperature (SST) was performed across the Red Sea for the period 2003 to 2020 using satellite data from the Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua. Employing a regionalization scheme based on principal component analysis (PCA), five homogenous sub-regions were identified that explain about 85 % of the total variation in SST across the Red Sea. The results indicate that there is a diverse and complex range of SST variability throughout the Red Sea. Spatially, distinct SST trends were observed between the southern (PC1) and northern (PC3) regions, which show northward enhancement in the rate of SST trends. A zonal contrast in the rate of warming over the western and eastern sectors was also observed, exhibiting more pronounced warming trends along the western coasts. In contrast to the offshore and deep waters, surface warming in shallow waters (depth < 100 m) was more pronounced, which poses detrimental effects (e.g., thermal coral bleaching) on regional marine ecosystems. We found a robust link between spatial patterns of SST anomalies and the phases of the Red Sea Dipole (RSD). This connection was largely regulated by the upwelling associated with the local wind-stress-curl. Further, the spatial and temporal patterns of wind-driven upwelling (i.e., coastal and wind-stress-curl-driven upwelling) were reminiscent of the SST trend, highlighting the significant role of the upwelling mechanism in the SST budget and trend across the Red Sea. The positive phase of the RSD aligns with periods of stronger Toker Jet activity, reinforcing cold SST anomalies in the southern Red Sea due to enhanced upwelling-induced cooling. However, the impacts of wind-driven upwelling on local SST differ from region to region, highlighting the need to employ a high-resolution wind dataset in the simulation of SST across the Red Sea. Overall, our findings offer insights into the complex mechanisms and factors influencing SST variability in the Red Sea, thereby contributing to improving coastal zone management and environmental planning efforts.

利用中分辨率成像光谱辐射计（MODIS） Aqua卫星数据，对2003 - 2020年红海海域的海表温度（SST）变化进行了综合分析。采用基于主成分分析（PCA）的分区方案，确定了5个同质子区域，它们解释了红海海温总变化的85%左右。结果表明，整个红海海温的变化范围多样而复杂。空间上，南（PC1）区和北（PC3）区海温趋势明显，海温趋势速率向北增强。还观察到东部和西部变暖速率的纬向差异，沿西海岸显示出更明显的变暖趋势。与近海和深水相比，浅水(depth <；100米)更为明显，这对区域海洋生态系统造成有害影响（例如，热珊瑚白化）。我们发现了海温异常的空间格局与红海偶极子（RSD）相之间的强大联系。这种联系在很大程度上是由与当地风应力旋度相关的上升流调节的。此外，风驱动上升流（即沿海和风应力-涡驱动的上升流）的时空格局与海温趋势相似，突出了上升流机制在红海海温收支和趋势中的重要作用。RSD的正相位与Toker Jet活动较强的时期一致，由于上升流引起的冷却增强，加强了红海南部的冷海温异常。然而，风驱动的上升流对当地海温的影响因区域而异，这突出了在模拟红海海温时使用高分辨率风数据集的必要性。总的来说，我们的研究结果揭示了影响红海海温变率的复杂机制和因素，从而有助于改善海岸带管理和环境规划工作。

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引用次数: 0

Comprehensive analysis of marine heatwaves and ocean thermal structure impact on typhoon intensification in the East China Sea 海洋热浪和海洋热结构对东海台风增强影响的综合分析

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Marine Systems

Pub Date : 2025-04-03 DOI: 10.1016/j.jmarsys.2025.104065

Thi-Kieu-Diem Nguyen , Po-Chun Hsu

This study utilizes satellite observations and high-resolution reanalysis data to investigate the potential mechanisms of typhoon intensification in the East China Sea (ECS) from 1993 to 2022. Oceanic and atmospheric conditions within the wind radii of 30 and 50 knots surrounding typhoons were analyzed. During the study period, 30 out of 91 typhoons traversing the ECS intensified. The results show that intensified typhoons typically experienced relatively warmer sea surface temperatures and higher average ocean heat content (OHC) than non-intensified typhoons. Intensified typhoons exhibited lower vertical wind shear and slightly higher relative humidity, which helped maintain storm structure organization and enhanced upper atmospheric moisture. However, variability among individual typhoons was significant. The analysis also indicates that these favorable thermal structures, characterized by high OHC, enhance typhoon intensity with only about 40 % probability. The mixed layer depth in the ECS is generally shallow, averaging less than 25 m, with minimal variation between intensified and non-intensified typhoons, making it challenging to use ocean stratification as a determinant for typhoon intensification. Furthermore, marine heatwave (MHW) events do not significantly alter the upper ocean thermal conditions during typhoon passage, indicating that typhoon intensification due to MHWs might be exceptional, with some typhoons potentially weakening as they encounter these conditions. This study underscores the difficulties of predicting typhoon intensity changes in the ECS's complex marine environment, posing ongoing challenges for coastal disaster management.

利用卫星观测资料和高分辨率再分析资料，研究了1993 - 2022年中国东海台风增强的潜在机制。分析了台风周围30节和50节风半径内的海洋和大气条件。在研究期间，91个台风中有30个台风增强。结果表明，与非强化台风相比，强化台风的海表温度相对较高，平均海洋热含量（OHC）较高。增强台风表现出较低的垂直风切变和稍高的相对湿度，有助于维持风暴结构组织和增强高层大气湿度。然而，个别台风之间的差异是显著的。分析还表明，以高热含量为特征的有利热结构增强台风强度的概率仅为40%左右。ECS的混合层深度一般较浅，平均小于25米，强台风和非强台风之间的差异很小，这使得使用海洋分层作为台风强度的决定因素具有挑战性。此外，在台风通过期间，海洋热浪（MHW）事件并没有显著改变上层海洋热条件，这表明由于MHW引起的台风增强可能是例外，一些台风在遇到这些条件时可能会减弱。这项研究强调了在ECS复杂的海洋环境中预测台风强度变化的困难，为沿海灾害管理带来了持续的挑战。

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引用次数: 0

Linking oceanographic conditions to foraging behaviour of southern elephant seals by characterising mid-trophic levels with an animal-borne echosounder 通过动物传播的回声探测仪表征中等营养水平，将海洋条件与南象海豹的觅食行为联系起来

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Marine Systems

Pub Date : 2025-03-22 DOI: 10.1016/j.jmarsys.2025.104064

Marius Molinet , Antoine-Peio Uhart , Nadège Fonvieille , Jade Chevassu , Clément Castrec , Martin Tournier , Didier Goulet-Tran , Mathilde Chevallay , Ziad Sari El Dine , Baptiste Picard , Roy El Hourany , David Nerini , Christophe Guinet

Changes in Southern Ocean thermohaline conditions could drive changes in phytoplankton community composition propagating into upper-trophic levels, from the abundance and composition of mid-trophic level communities to foraging behaviour of top marine predators. Studies exploring the ecological consequences of such processes are largely limited by our in-situ observation capacity. The simultaneous deployment of a miniature sonar tag, combining active acoustics and movement sensors, with oceanographic tags on 4 adult female southern elephant seals from the Kerguelen Islands provided in-situ measurements of thermohaline conditions, mid-trophic level abundance and seal-foraging behaviour. In addition, chlorophyll-a concentration and relative abundance of different phytoplankton size classes were assessed from satellite ocean colour data. This study reveals that east of the Kerguelen Islands, the subsurface scatterer abundance (related to mid-trophic level organisms) assessed by the sonar tag was partly positively linked to surface satellite-derived microphytoplankton biomass, especially in colder waters and frontal zones. Female elephant seals were found to dive shallower with higher subsurface scatterer abundance, which indicated a better prey accessibility, and were found to catch more prey when foraging in shallow and/or frontal zones. This study highlights the usefulness of the sonar tag, deployed on deep-diving elephant seals, to link thermohaline conditions and phytoplankton community composition in mid-trophic levels. Our result suggests that in addition to phytoplankton biomass, mid-trophic level abundance and distribution might be key factors in influencing top-marine predator foraging performances.

南大洋温盐条件的变化可以驱动浮游植物群落组成的变化，从中营养级群落的丰度和组成到顶级海洋捕食者的觅食行为。探索这些过程的生态后果的研究在很大程度上受到我们现场观测能力的限制。研究人员将结合主动声学和运动传感器的微型声纳标签与海洋标签同时部署在4只来自凯尔盖伦群岛的成年雌性南象海豹身上，对温盐条件、中营养水平丰度和海豹觅食行为进行了现场测量。此外，利用卫星海洋颜色数据评估了不同浮游植物大小类别的叶绿素-a浓度和相对丰度。该研究表明，在Kerguelen群岛东部，声纳标签评估的地下散射体丰度（与中营养级生物相关）与地表卫星衍生的微型浮游植物生物量部分正相关，特别是在较冷的水域和锋面区。雌海象的潜深较浅，潜深下散射丰度较高，猎物可及性较好，在浅海和（或）额区觅食时捕获的猎物较多。这项研究强调了部署在深潜海象身上的声纳标签的实用性，它可以将温盐条件和中等营养水平的浮游植物群落组成联系起来。结果表明，除浮游植物生物量外，中等营养水平的丰度和分布可能是影响顶级海洋捕食者觅食性能的关键因素。

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引用次数: 0

Contrasting environmental responses in an Atlantic coastal system: Recent sedimentary record from the inner Ría of Vigo (NW Spain) 大西洋海岸系统的环境响应对比：来自西班牙西北部维戈Ría内部的近期沉积记录

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Marine Systems

Pub Date : 2025-03-19 DOI: 10.1016/j.jmarsys.2025.104063

Jon Gardoki , Alejandro Cearreta , Manel Leira , José Gómez-Arozamena , Víctor Villasante-Marcos , Ane García-Artola , María Jesús Irabien

Anthropogenic pressures compromise the integrity of coastal systems, including the Ría of Vigo (NW Spain). Environmental reconstructions often focus on a sedimentary compartment, potentially overlooking their inherent complexities. Here, recent intertidal and subtidal sedimentary records from the inner Ría of Vigo were examined through a multi-proxy perspective, comprising micropaleontological (benthic foraminifera and diatoms), sedimentological (grain-size), organic (TOC, TN and TS) and inorganic-geochemical (Al, Cu, Pb, Zn and Ni), physical (magnetic susceptibility), and stable (δ¹³C and δ¹⁵N) and radiogenic isotope (²¹⁰Pb, ¹³⁷Cs and ^239+240Pu) proxies. The results evidence disruptions during last decades leading to contrasting responses. Intertidal compartments showed accelerated foraminiferal taphonomic loss, which obscured ecological gradients; however, diatoms and geochemistry provided insights into the mosaic of environmental factors. Subtidal bottoms experienced disturbances since the mid-20^th century, impacting benthic foraminifera and diatoms due to mussel aquaculture, urban development and hydrological changes. These processes led to hypertrophic zones with opportunistic foraminifera, benthic and higher salinity diatoms, and higher TOC, TN and δ¹⁵N. The perturbation of previous conditions affected different trophic levels and masked the intrusion of more saline waters and upwelling signals, likely facilitated by the low hydrodynamics and limited water renewal.

人为压力损害了沿海系统的完整性，包括Ría的维戈（西班牙西北部）。环境重建通常侧重于沉积区，可能忽略了其内在的复杂性。本文利用微古生物（底栖有孔虫和硅藻）、沉积学（粒度）、有机（TOC、TN和TS）和无机地球化学（Al、Cu、Pb、Zn和Ni）、物理（磁化率）、稳定（δ13C和δ15N）和放射性同位素（210Pb、137Cs和239+240Pu）等代用指标，研究了Vigo内部Ría的潮间带和潮下沉积记录。结果表明，在过去的几十年里，破坏导致了截然不同的反应。潮间带间有孔虫群落的消失速度加快，使生态梯度变得模糊；然而，硅藻和地球化学提供了对环境因素马赛克的见解。自20世纪中期以来，由于贻贝养殖、城市发展和水文变化，潮下底部经历了扰动，影响了底栖有孔虫和硅藻。这些过程导致了条件有孔虫、底栖动物和高盐度硅藻的肥厚带，以及较高的TOC、TN和δ15N。先前条件的扰动影响了不同的营养水平，并掩盖了更多盐水的入侵和上涌信号，这可能是由低水动力学和有限的水更新促进的。

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引用次数: 0

Sources of organic carbon in surface sediments of Hangzhou Bay and Zhejiang coastal area: Implication from total organic carbon, lignin and algal pigments 杭州湾及浙江沿海表层沉积物中有机碳的来源：来自总有机碳、木质素和藻类色素的启示

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Marine Systems

Pub Date : 2025-03-10 DOI: 10.1016/j.jmarsys.2025.104062

Yuhao Xue , Qianqian Wang , Xiaoyong Duan , Dahai Zhang , Xianguo Li

In this study, surface sediment samples (n = 49) were collected from Hangzhou Bay and Zhejiang coastal area. We combine bulk parameters (total organic carbon, TOC and stable carbon isotope signature, δ¹³C) with both terrestrial (lignin) and marine (pigments) sources' biomarkers to elucidate the sources of organic carbon. The high contents of TOC were related to inputs from Ou River, Hangzhou Bay, Changjiang Diluted Water and Yong River. Stable carbon isotope signature (δ¹³C) and C/N ratio of the bulk organic matter indicated that the organic carbon in these samples was mainly derived from marine organic matters together with a little contribution from terrestrial sources. The eight lignin-phenols normalized to organic carbon (Λ₈) in this study were relatively low, which was attributed to the strong tidal forces in Hangzhou Bay and the shallow water depth in coastal areas. The S/V and C/V ratios of lignin-phenols demonstrated that lignin in our research area was mainly derived from angiosperms, with a small contribution from gymnosperms. The concentrations of nine pigments detected in this study were relatively low, and the concentration of fucoxanthin reduces with distance from the shoreline (in the southern area of 29°N), while the case was in the contrary for prasinoxanthin and zeaxanthin. Chlorophyll a was only detected in a few samples with the lowest average concentration. There was no obvious distribution characteristic of organic carbon, lignin and pigments from north to south of the entire study area, accompanied with some partial distribution features, which could be attributed to the complicated hydrodynamic conditions and diverse organic carbon sources.

本研究收集了杭州湾和浙江沿海地区的表层沉积物样本（n = 49）。我们将总体参数（总有机碳TOC和稳定碳同位素δ13C）与陆源（木质素）和海源（色素）生物标志物相结合来阐明有机碳的来源。TOC的高含量与瓯江、杭州湾、长江稀释水和永河的输入有关。稳定碳同位素特征（δ13C）和碳氮比表明，样品中有机碳主要来自海相有机质，陆相有机质贡献较小。本研究中归一化为有机碳（Λ8）的8种木质素酚相对较低，这与杭州湾潮汐力强和沿海水深较浅有关。木质素酚类物质的S/V和C/V比值表明，本研究区木质素主要来源于被子植物，裸子植物的木质素贡献较小。本研究检测到的9种色素浓度较低，岩藻黄质浓度随距离海岸线的远近而降低（在29°N的南部地区），而葡萄黄质和玉米黄质则相反。叶绿素a仅在平均浓度最低的少数样品中检测到。整个研究区从北向南有机碳、木质素和色素的分布特征不明显，但存在一定的局部分布特征，这可能与研究区水动力条件复杂、有机碳来源多样有关。

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引用次数: 0

30 years of sea surface temperature and salinity observations crossing the Southern Ocean near 140°E: Trends and rollercoaster variability 东经140°附近穿越南大洋的30年海表温度和盐度观测：趋势和过山车式的变化

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Marine Systems

Pub Date : 2025-03-05 DOI: 10.1016/j.jmarsys.2025.104048

Rosemary Morrow, Elodie Kestenare

Observations of high-resolution sea surface temperature, salinity and density are analysed over 30 years along a transect crossing the Southern Ocean from Tasmania to Antarctica near 140°E during austral summer. Three dynamical regions are investigated in fixed latitude bands. The Subtropical and Subantarctic Zones show a surface warming trend of 0.33 °C/decade in accord with previous studies, and surface salinity has increased by 0.05/decade. This trend towards warmer, saltier surface waters is mostly density compensated; the large trend dominates over the interannual variability. The increased presence of warm, salty subtropical waters is linked to the poleward shift in the Subtropical Front which is now located 160 km further south than in the early 1990s, whereas the Subantarctic Front and Polar Front positions remain stable. This reduces the effective summer surface area of the Subantarctic Zone by one-third over 30 years. Interannual changes in the influx of subtropical waters across 140°E are linked to the main climate modes. Austral summers having warmer, saltier conditions occur during the positive Southern Annular Mode (SAM) and La Nina phases; cooler fresher conditions occur during negative SAM and El Nino. In the Antarctic Zone south of the Polar Front, the freshening trend reported over the 1990s and 2000s has stabilized. The mean austral SSS increased slightly over the last decade, and the 30-year trend in surface salinity is now zero. The Sea-Ice Zone south of 60°S around 140°E was largely impacted by the Mertz Glacier calving in 2010, releasing a large volume of sea-ice over the following years. Interannual changes in summer surface salinity are anti-correlated with the available sea-ice the previous spring. Over the 30-year period, the region south of 60°S has freshened by 0.012 per decade, and cooled by 0.06 °C per decade. Coastal waters off Antarctica show the largest impact: here surface waters have freshened by 0.1 over three decades, even as the summer sea-ice concentration has been reduced by 2.5 %. The Subantarctic Zone and the Sea-Ice Zone exhibit a rollercoaster of large interannual changes since 2017, and continued monitoring is required to understand the long-term effects of this recent increased variability.

在南极夏季，沿着从塔斯马尼亚到南极洲的横断面，分析了30年来在东经140°附近的高分辨率海面温度、盐度和密度观测。在固定纬度波段研究了三个动力区域。与以往研究结果一致，副热带和亚南极区地表增温趋势为0.33°C/ a，地表盐度增加0.05°C/ a。这种变暖、变咸的地表水趋势主要是密度补偿的；大趋势大于年际变率。亚热带温暖咸水的增加与副热带锋的极向移动有关，副热带锋现在比1990年代初向南移动了160公里，而亚南极锋和极锋的位置保持稳定。这使得亚南极区的夏季有效表面积在30年内减少了三分之一。140°E副热带海水流入的年际变化与主要气候模式有关。在正的南环模（SAM）和拉尼娜阶段，南方夏季的温度更高、更咸；在负SAM和厄尔尼诺期间，天气会变冷。在极地锋以南的南极区，1990年代和2000年代报告的新鲜趋势已经稳定下来。在过去十年中，平均南部SSS略有增加，表面盐度的30年趋势现在为零。60°S以南约140°E的海冰区在很大程度上受到2010年默茨冰川崩解的影响，在接下来的几年里释放了大量的海冰。夏季海面盐度的年际变化与前一个春季可用海冰呈反相关关系。30年间，60°S以南地区每10年升温0.012°C，每10年降温0.06°C。南极洲沿海水域受到的影响最大：在过去30年里，这里的地表水变新鲜了0.1%，而夏季海冰浓度却减少了2.5%。自2017年以来，亚南极带和海冰带呈现出巨大的年际变化，需要持续监测以了解最近这种变动性增加的长期影响。

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引用次数: 0

Trend analysis of time series variations in the marine environments and size-fractionated chlorophyll a in the coastal areas of eastern Hokkaido, southwestern Okhotsk Sea 北海道东部、鄂霍次克海西南部沿海海域海洋环境和叶绿素a大小分异时间序列变化趋势分析

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Marine Systems

Pub Date : 2025-03-04 DOI: 10.1016/j.jmarsys.2025.104052

Akihiro Shiomoto , Kosuke Inoue , Takeshi Okunishi

The coastal areas of eastern Hokkaido, located in the southwestern part of the Okhotsk Sea, are unique areas where the Soya Warm Current Water (SWCW) and the East Sakhalin Current Water (cold water) alternate seasonally. They are important sea areas for Japanese fishery production. Observational results off Cape Notoro, eastern Hokkaido, over the last 10 years (2011−2022), showed that the influence of the Tsushima Warm Current Water (TWCW), the origin of the SWCW, has become stronger. The TWCW is dominated by small phytoplankton. An increase in their impact will have a similar effect on the ecosystem in the SWCW, where large phytoplankton dominate, as the shift to small phytoplankton occurs owing to global warming. Although the change in small phytoplankton observed in the current study was not statistically significant, the standing stock of small phytoplankton has been high over the past few years. An increase in the influence of the TWCW and a shift to small phytoplankton were observed in Saroma-ko Lagoon (2009–2022), the largest brackish-water lake in eastern Hokkaido. Data from the past 35 years (1987–2021) indicated a significant increase in the surface water temperature. Furthermore, off Shibetsu in the Nemuro Strait on the east side of the Okhotsk Sea across the Shiretoko Peninsula (2009–2022), the influence of the TWCW strengthened and indications of a shift to small phytoplankton were found. This study showed that in the phytoplankton community, the significance of small phytoplankton as primary producers has risen in response to environmental changes such as global warming and the growing inflow of the TWCW, in the coastal areas of eastern Hokkaido in the Okhotsk Sea. There have been concerns regarding future changes in the ecosystems and fishery production. Therefore, it is essential to continue monitoring studies for sustainable fishery production.

位于鄂霍次克海西南部的北海道东部沿海地区是大豆暖流（SWCW）和东库页岛暖流（冷水）季节性交替的独特地区。它们是日本渔业生产的重要海域。近10年（2011 ~ 2022年）北海道东部诺托罗角海域的观测结果表明，作为对马暖流起源的对马暖流（TWCW）的影响越来越强。TWCW以小型浮游植物为主。随着全球变暖导致浮游植物向小型浮游植物的转变，它们的影响的增加将对SWCW的生态系统产生类似的影响。在SWCW，大型浮游植物占主导地位。虽然本研究中观察到的浮游植物的变化没有统计学意义，但在过去的几年里，浮游植物的存量一直很高。在北海道东部最大的咸水湖Saroma-ko泻湖（2009-2022年）观察到TWCW的影响增加，并向小型浮游植物转移。过去35年（1987-2021）的数据表明，地表水温度显著升高。此外，在鄂霍次克海东侧横跨Shiretoko半岛的Nemuro海峡的Shibetsu附近（2009-2022年），发现TWCW的影响增强，并有向小型浮游植物转移的迹象。研究表明，在鄂霍次克海北海道东部沿海地区，小型浮游植物作为初级生产者的重要性随着全球变暖和TWCW流入增加等环境变化而上升。人们一直担心生态系统和渔业生产的未来变化。因此，必须继续对可持续渔业生产进行监测研究。

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引用次数: 0

Climate-driven warming, deoxygenation, and desertification in large marine ecosystems 大型海洋生态系统中气候驱动的变暖、脱氧和荒漠化

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Marine Systems

Pub Date : 2025-03-03 DOI: 10.1016/j.jmarsys.2025.104053

Roberto Mario Venegas , Malika Kheireddine , Juan Pablo Rivera Caicedo , Eric A. Treml

This study explores Large Marine Ecosystems (LME) impacts caused by climate-induced changes in sea surface temperature (SST), surface dissolved oxygen concentrations (O₂), and surface phytoplankton concentrations (CHL). It spans pre-industrial (1850–1900) to future (2015–2099) epochs under Shared Socioeconomic Pathways (SSPs) medium (SSP-2.45) and high (SSP-5.85) CO₂ emission scenarios. Across the 66 LMEs, we observed consistent warming, deoxygenation, and desertification, with more pronounced changes in SSP-5.85. SST trends (°C/decade) varied from 0.04 to 0.29 (SSP-2.45) and 0.12 to 0.63 (SSP-5.85), resulting in net increases from >3 °C (SSP-2.45) to >4.5 °C (SSP-5.85). O₂ exhibited trends (μmol/kg/decade) of −0.04 to −1.97 (SSP-2.45), with substantial declines in SSP-5.85 (−0.86 to −3.93), and significant net decreases (μmol/kg) of >−18 (SSP-2.45) and >−25 (SSP-5.85). CHL showed significant decreases (kg/m³) up to −0.31 (SSP-2.45) and −0.36 (SSP-5.85), with negative trends (kg/m³/decade) up to −0.0097 (SSP-2.45) and −0.0159 (SSP-5.85), except the Black Sea and Antarctica which exhibited positive trends. Climate indices reveal that LMEs experiencing the least impacts across all indicators occur in the East Siberian Sea, Faroe Plateau, Central Arctic, and Gulf of Mexico, in both scenarios. However, under the SSP-2.45 scenario, additional the Laptev Sea, Insular Pacific-Hawaiian also experienced lower impacts. In SSP-5.85, reduced impacts are observed in the South Brazil Shelf, East Brazil Shelf, Agulhas Current, West Central Australian Shelf, and Canadian High Arctic-North Greenland. Conversely, the most impacted LMEs, including the Barents Sea, Norwegian Sea, Oyashio Current, West Bering Sea, and the Aleutian Islands are affected in both scenarios. Additionally, the Pacific Central-American Coastal region, the Gulf of Alaska, Benguela Current, and the Sea of Japan are affected in the SSP-2.45 scenario. Only the Scotian Shelf experienced high impacts in SSP-5.85. Antarctica exhibited low impacts in both scenarios but substantial increases in SST, O₂, and CHL.

本研究探讨了气候引起的海表温度（SST）、表层溶解氧浓度（O2）和表层浮游植物浓度（CHL）变化对大型海洋生态系统（LME）的影响。在共享社会经济路径（ssp）中（SSP-2.45）和高（SSP-5.85）二氧化碳排放情景下，它跨越了工业化前（1850-1900）到未来（2015-2099）时代。在66个LMEs中，我们观察到一致的变暖、脱氧和沙漠化，其中SSP-5.85的变化更为明显。海温趋势（°C/ 10年）在0.04 ~ 0.29 （SSP-2.45）和0.12 ~ 0.63 （SSP-5.85）之间变化，导致净增温从3°C （SSP-2.45）增加到4.5°C （SSP-5.85）。O2的变化趋势（μmol/kg/decade）为−0.04 ~−1.97 (SSP-2.45), SSP-5.85显著下降（−0.86 ~−3.93），而ssp - 18 （SSP-2.45）和ssp - 25 （SSP-5.85）显著净下降（μmol/kg）。除黑海和南极洲呈正趋势外，CHL呈负趋势（kg/m3/ 10年），分别为- 0.31 （SSP-2.45）和- 0.36 (SSP-5.85)，负趋势（kg/m3/ 10年）为- 0.0097 （SSP-2.45）和- 0.0159 （SSP-5.85）。气候指数显示，在两种情景下，东西伯利亚海、法罗高原、北极中部和墨西哥湾的LMEs受所有指标影响最小。然而，在SSP-2.45情景下，拉普捷夫海、岛屿太平洋-夏威夷也受到了较小的影响。在SSP-5.85中，在南巴西大陆架、东巴西大陆架、阿古拉斯海流、西澳大利亚大陆架和加拿大北极-北格陵兰高地观察到的影响减少。相反，受影响最大的LMEs，包括巴伦支海、挪威海、大潮流、西白令海和阿留申群岛，在两种情况下都受到影响。此外，太平洋中美洲沿海地区、阿拉斯加湾、本格拉海流和日本海也受到SSP-2.45情景的影响。只有苏格兰大陆架在SSP-5.85中受到了高影响。南极洲在两种情景下都表现出较低的影响，但海温、O2和CHL大幅增加。

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引用次数: 0

Global surface ocean calcite saturation (Ωcal) estimation using satellite and in-situ observations 利用卫星和原位观测估算全球海洋表面方解石饱和度（Ωcal）

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Marine Systems

Pub Date : 2025-03-02 DOI: 10.1016/j.jmarsys.2025.104054

Ibrahim Shaik , P.V. Nagamani , Sandesh Yadav , Yash Manmode

Calcite saturation (Ω_cal) in global surface ocean waters is a crucial parameter for assessing marine ecosystem health. This study presents a multiparametric linear regression (MLR) model integrating satellite and in-situ observations to estimate global surface ocean Ω_cal. The model was developed using in-situ measurements of sea surface temperature (SST), sea surface salinity (SSS), total alkalinity (TA), dissolved inorganic carbon (DIC) and Ω_cal obtained from the National Center for Environmental Information (NCEI), combined with satellite derived chlorophyll concentrations (Chla). Model validation demonstrated strong agreement with in-situ data, indicating high accuracy of estimation. Satellite derived Ω_cal estimates also showed robust correlations with in-situ measurements, confirming the MLR model reliability. Sensitivity analysis highlighted the model resilience to variations in input parameters. This study reveals significant spatiotemporal variability in Ω_cal, driven by physical, chemical, and biological processes, including seasonal patterns and climate phenomena like the El Nino Southern Oscillation (ENSO) and North Atlantic Oscillation (NAO). Analysis of interannual trends and the rate of change in Ω_cal emphasize the impacts of ocean acidification, revealing a declining trend that poses challenges to marine ecosystems. The proposed approach offers a valuable tool for monitoring global ocean carbonate chemistry, providing insights into the long term impacts of environmental changes on marine health and enabling informed decision making for ecosystem management.

全球表层海水方解石饱和度（Ωcal）是评估海洋生态系统健康的重要参数。本文提出了一种综合卫星和现场观测的多参数线性回归（MLR）模型，用于估算全球表面海洋Ωcal。该模型是利用美国国家环境信息中心（NCEI）提供的海表温度（SST）、海表盐度（SSS）、总碱度（TA）、溶解无机碳（DIC）和Ωcal的原位测量数据，结合卫星衍生叶绿素浓度（Chla）建立的。模型验证与现场数据吻合较好，具有较高的估计精度。卫星推导的Ωcal估计值也显示出与原位测量值的强相关性，证实了MLR模型的可靠性。敏感性分析强调了模型对输入参数变化的弹性。该研究揭示了Ωcal的显著时空变异，受物理、化学和生物过程驱动，包括季节模式和气候现象，如厄尔尼诺-南方涛动（ENSO）和北大西洋涛动（NAO）。对Ωcal年际趋势和变化率的分析强调了海洋酸化的影响，揭示了对海洋生态系统构成挑战的下降趋势。提出的方法为监测全球海洋碳酸盐化学提供了一个有价值的工具，提供了对环境变化对海洋健康的长期影响的见解，并为生态系统管理提供了明智的决策。

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引用次数: 0

Phytoplankton photosynthetic parameters and primary production in some Arctic regions during the summer of 2020 2020年夏季北极部分地区浮游植物光合参数和初级产量

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Marine Systems

Pub Date : 2025-03-01 DOI: 10.1016/j.jmarsys.2025.104050

Tatiana Efimova , Tatiana Churilova , Elena Skorokhod , Anatoly Buchelnikov , Nataliia Moiseeva

In August 2020, during the 80th cruise of the R/V “Akademik Mstislav Keldysh”, phytoplankton photosynthetic parameters were measured in the Norwegian Sea, the Barents Sea and the adjacent area of the Arctic Ocean. Primary production in the Arctic area was estimated using full spectral approach that took into account quantum yield of photosynthesis (ϕ), phytoplankton spectral light absorption coefficient and spectral downwelling irradiance. Total light absorption by all optically active components except water influenced spectral features of downwelling irradiance: increase of the total non-water light absorption at the sea surface layer resulted in a shift of the wavelength of the downwelling irradiance spectrum maximum to the longer wavelength (from 500 ± 7 nm to 530 ± 5 nm). Phytoplankton photosynthetic parameters (maximum quantum yield (ϕ_max) and light intensity saturating photosynthesis) were depth-dependent variables due to phytoplankton photoacclimation. Relationships between photosynthetically available radiation (PAR) vs. ϕ_max and PAR vs. ϕ were described. Although chlorophyll-a specific photosynthetic rate (P^B) ranged from 0.5 to 1.5 mgC/mgChl-a/h in the surface layer, daily primary production (1.1 mgC/m³/d - 32 mgC/m³/d) was correlated to chlorophyll-a concentration (Chl-a) (r = 0.97, n = 22, p < 0.0001), which is likely to be caused by higher variability of Chl-a (0.07 mg/m³–1.5 mg/m³) compared to P^B. The full spectral approach developed for the Black Sea is relevant for correct assessment of primary production in the Arctic area.

2020年8月，在“姆斯蒂斯拉夫·凯尔迪什院士号”R/V第80次巡航期间，在挪威海、巴伦支海和北冰洋邻近地区测量了浮游植物光合参数。利用全光谱方法估算了北极地区的初级产量，该方法考虑了光合作用的量子产率（ϕ）、浮游植物光谱光吸收系数和光谱下流辐照度。除水外的所有光学活性组分的总光吸收影响了下行辐照度的光谱特征：海表层非水光吸收总量的增加导致下行辐照度光谱的波长最大地向更长的波长偏移（从500±7 nm到530±5 nm）。浮游植物光合参数（最大量子产率（maximum quantum yield， ϕmax）和饱和光合作用光强）是浮游植物光适应的深度相关变量。描述了光合有效辐射（PAR）与ϕ之间的关系。虽然表层叶绿素-a比光合速率（PB）在0.5 ~ 1.5 mg /m3 -a/h之间，但日初级生产量（1.1 mg /m3/d ~ 32 mg /m3/d）与叶绿素-a浓度（Chl-a）呈正相关(r = 0.97, n = 22, p <；0.0001)，这可能是由于与PB相比，Chl-a的变异性更高（0.07 mg/m3 - 1.5 mg/m3）。为黑海开发的全谱方法与正确评估北极地区的初级生产有关。

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引用次数: 0