South China Sea SST Fronts, 2015–2022

Remote Sensing, Год журнала: 2025, Номер 17(5), С. 817 - 817

Опубликована: Фев. 27, 2025

High-resolution (2 km), high-frequency (hourly) SST data of the Advanced Himawari Imager (AHI) flown onboard Japanese Himawari-8 geostationary satellite were used to derive monthly climatology temperature fronts in South China Sea. The from 2015 2022 processed with Belkin–O’Reilly algorithm generate maps gradient magnitude GM. GM log-transformed enhance contrasts digital and reveal additional features (fronts). combination high-resolution, cloud-free, four-day-composite imagery AHI, advanced front-preserving BOA, contrast enhancement log-transformation gradients allowed us identify numerous mesoscale/submesoscale (including a few that have never been reported) document their month-to-month variability spatial patterns. spatiotemporal was analyzed detail five regions: (1) In Taiwan Strait, six identified: Coastal Front, Bank Changyun Ridge East Penghu Channel Eastern/Western Islands fronts; (2) Guangdong Shelf is dominated by Front winter, eastern western separated Pearl River outflow summer; (3) Hainan Island surrounded upwelling various nature (wind-driven coastal topographic) tidal mixing Beibu Gulf, Red Outflow extends southward as Vietnam while northern Gulf front off Guangxi coast; (4) Off SE Vietnam, 11°N gives rise summertime front, Mekong associated extend seasonally toward Cape Camau, close Thailand Entrance Front; (5) Luzon Kuroshio manifests chain three across Babuyan Islands, west broad offshore frontal zone persists winter. eastward jet (SEJ) documented five-day mean data. SEJ emerges June–September center up 114°E. zonally oriented observed be located between two large gyres, each about 300 km diameter.

Язык: Английский

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The impact of environmental conditions on the heat tolerance of Acropora hyacinthus

Journal of Experimental Marine Biology and Ecology, Год журнала: 2025, Номер 585, С. 152096 - 152096

Опубликована: Март 6, 2025

Язык: Английский

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Spatiotemporal distribution, composition, and influencing factors of lipophilic marine algal toxins in the Beibu Gulf, China: Implications for necessity of offshore seawater monitoring

Harmful Algae, Год журнала: 2025, Номер 145, С. 102845 - 102845

Опубликована: Апрель 6, 2025

Язык: Английский

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Upwelling Variability in the Western South China Sea Associated With Global Climate Change

Journal of Geophysical Research Oceans, Год журнала: 2025, Номер 130(5)

Опубликована: Май 1, 2025

Abstract In this study, the changes in interannual variability of upwelling Western South China Sea (SCS) from 1958 to 2015 and their relationships with climate are investigated using reanalysis data numerical simulations. Our results show that three main regions, is, East Coast Vietnam (VE), Southwest Hainan Island (HNW), (HNE), has significantly changed after 1990s, influenced by El Niño Southern Oscillation (ENSO) Indian Ocean dipole (IOD). Specifically, variance VE HNW increased over 20%, while HNE decreased 30% 1990s. The effects ENSO IOD on have enhanced during both positive negative phases weakened phases. Wind Ekman pumping anomalies primary forces driving upwelling. However, for phase ENSO, large‐scale circulation dominate study highlights complexity mechanisms SCS importance predicting long‐term changes.

Язык: Английский

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Bottom‐Up Control and Phytoplankton Succession in a Subtropical Upwelling System

Journal of Geophysical Research Oceans, Год журнала: 2025, Номер 130(5)

Опубликована: Май 1, 2025

Abstract Diagnosing whether upwelling systems are governed by bottom‐up or top‐down control is critical for understanding marine ecosystem productivity and trophic interactions. While temperate widely studied generally characterized control, the dominant regulatory mechanism in subtropical remains unclear due to their unique physical biogeochemical dynamics. This study investigated Qiongdong system northwest South China Sea, aiming elucidate drivers of phytoplankton biomass, community composition, interactions across different phases. Three consecutive surveys conducted during summer 2023 revealed significant spatial temporal variations hydrological parameters, nutrient availability, biological communities. Nutrient availability was closely linked intensity, consistently supporting elevated mesozooplankton indicating that plays a role this system. Phytoplankton composition exhibited distinct successional pattern: Prochlorococcus dominated early stages, possibly influenced vertical advection transported it from subsurface waters surface. As intensified, diatoms prevailed, supported increased nitrate turbulent mixing. succession highlights how chemical processes interact shape Additionally, less abundant groups such as cryptophytes prasinophytes enhanced diversity contributed stability under fluctuating environmental conditions. These findings highlight highly productive nutrient‐driven processes, offering insights into mechanisms regulating potential responses variability.

Язык: Английский

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Impacts of Marine Heatwave Events on Three Distinct Upwelling Systems and Their Implications for Marine Ecosystems in the Northwestern South China Sea

Remote Sensing, Год журнала: 2023, Номер 16(1), С. 131 - 131

Опубликована: Дек. 28, 2023

Under global warming, the frequency and intensity of marine heatwaves are increasing. However, inhibition atmospheric-forcing (AMHW) on upwelling their impacts ecosystems remain poorly understood. To address this issue, satellite sea surface temperature reanalysis data during 1998–2021 were analyzed in three distinct systems, northwestern South China Sea. The results showed that coastal tide-induced west (W) Hainan Island is primarily suppressed by enhanced stratification AMHW events, since insensitive to wind weakening. Contrarily, wind-driven east (E) northeast (NE) jointly regulated AMHW. Specifically, events have a stronger inhibitory effect phytoplankton growth NE than E. causes could be following: (1) background region E; thus, has higher susceptibility weakening; (2) begins when high-pressure system aligned with coastline upwelling. In region, location center occurrence positioned closer proximity area. Moreover, weakening enhancing changes development Before mature phase AMHW, inhibit growth, while shift stratification-dominated (>85%) occurs decline phase. This study suggests MHW great impact ecosystem, especially upwelling, which should given high attention under warming (with increasing future).

Язык: Английский

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Upwelling in Marginal Seas and Its Association with Climate Change Scenario—A Comparative Review

Climate, Год журнала: 2023, Номер 11(7), С. 151 - 151

Опубликована: Июль 18, 2023

After Bakun proposed his hypothesis in 1990 regarding upwelling under climate change, researchers conducted intensive studies to obtain the trends, current status, and future predictions of upwelling. Numerous have mainly focused on four major areas, which are part Eastern Boundary Upwelling System (EBUS). However, despite its importance, little attention has been given marginal seas areas such as South China Sea (SCS), Arabian Sea, Baltic other small-scale locations. Here, we combined several published develop a new synthesis describing change impacts these areas. There had uncertainty intensification upwelling, depending locations, data type, method used. For SCS, Vietnam northern SCS showed intensifying while Taiwan Strait decreasing trend. Separate eastern Hainan (Somali Oman) contrasting results, where both increasing trends recorded. Like different results for they found negative along Polish, Latvian Estonian, positive Swedish coast Finnish Gulf Finland. While small scales La Guajira southern Java respectively. All limited suggest that need conduct lot more studies, including projection by using models understanding how responds change.

Язык: Английский

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Size-dependent zoogeographical distribution of gelatinous thaliaceans associated with current velocity and temperature

The Science of The Total Environment, Год журнала: 2024, Номер 920, С. 170943 - 170943

Опубликована: Фев. 15, 2024

Язык: Английский

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Different vertical heat transport induced by submesoscale motions in the shelf and open sea of the northwestern South China Sea

Frontiers in Marine Science, Год журнала: 2023, Номер 10

Опубликована: Июль 28, 2023

Submesoscale currents are known to be associated with strong vertical velocities (O (10) m/day), regulating the redistributions of energy and matter balances. The northern South China Sea (SCS) is fulfilled submesoscale motions, which might induce heat transport (VHT). We set up a 1-km horizontal resolution Massachusetts Institute Technology General Circulation Model (MITgcm) study seasonal variations in shelf regions open seas. Spectrum analysis shows that spatial scale separating mesoscale motions 14 30 km for regions, respectively. VHT region one order magnitude larger than ocean. former has largest value summer winter, induced by upwelling winter downwelling, while latter strongest weakest regions. also appears have intra-seasonal attributed disturbances tropical cyclones life stages eddies. pregeneration phase eddies, maximum belt an entrainment type at developing mature stages. chlorophyll- concentration same temporal variation as different life-stage This provides local expected improve our understanding air–sea interactions their biological effects.

Язык: Английский

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Recent progresses in the studies of boundary upwelling

Elsevier eBooks, Год журнала: 2024, Номер unknown, С. 305 - 337

Опубликована: Янв. 1, 2024

Язык: Английский

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