Why does surface chlorophyll-a bloom in Taiwan Shoal all year round?

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research Pub Date : 2025-02-15 DOI:10.1016/j.csr.2025.105437

Qi Feng , Rufa’i Isyaku , Yulin Zhu , Ling Hao , An Zhang , Xin Zhou , Haibin Lü

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引用次数: 0

Abstract

Based on 10 years (January 2012–December 2021) of satellite observations, sea surface chlorophyll-a (Chl-a) was found to be present in the Taiwan Shoal throughout the year. The underlying mechanisms were investigated. The seasonal mechanism was investigated based on satellite remote sensing data, reanalysis data, and Argo buoy data. The relationship between the seasonal variation of Chl-a and sea surface temperature (SST), wind speed, photosynthetically active radiation (PAR) and salinity in Taiwan shoals was calculated. The results revealed that a large amount of Chl-a was present in the study area throughout the year, where the Chl-a concentration reached a maximum of 0.88 mg m⁻³ in July, which was 1.76 times greater than that (0.50 mg m⁻³) in April. In summer, there was increased upwelling and a thinner mixed layer, which pulled the bottom nutrients to the surface and led to the inflow of South China Sea water (SCSW) with Chl-a in the horizontal direction. In winter, the Kuroshio Branch Water (KBW) intrusion and the inflow of Chinese coastal water into the northern part of the Taiwan Strait (TWS) resulted in a zone of high temperature gradient, whereas the strong northeasterly monsoon strengthened the vertical mixing of the study area, which coincided with the zone of high Chl-a values. The combination of nutrient-rich waters, suitable temperatures in spring, and sufficient photosynthetically active radiation (PAR) in autumn provides favorable conditions for the accumulation of surface Chl-a. This study provides valuable insights into the ecological impacts of seasonal variations in Chl-a blooms in the TWS.

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为什么台湾浅滩的表层叶绿素-a 常年大量繁殖？

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来源期刊

Continental Shelf Research 地学-海洋学

CiteScore

4.30

自引率

4.30%

发文量

136

审稿时长

6.1 months

期刊介绍： Continental Shelf Research publishes articles dealing with the biological, chemical, geological and physical oceanography of the shallow marine environment, from coastal and estuarine waters out to the shelf break. The continental shelf is a critical environment within the land-ocean continuum, and many processes, functions and problems in the continental shelf are driven by terrestrial inputs transported through the rivers and estuaries to the coastal and continental shelf areas. Manuscripts that deal with these topics must make a clear link to the continental shelf. Examples of research areas include: Physical sedimentology and geomorphology Geochemistry of the coastal ocean (inorganic and organic) Marine environment and anthropogenic effects Interaction of physical dynamics with natural and manmade shoreline features Benthic, phytoplankton and zooplankton ecology Coastal water and sediment quality, and ecosystem health Benthic-pelagic coupling (physical and biogeochemical) Interactions between physical dynamics (waves, currents, mixing, etc.) and biogeochemical cycles Estuarine, coastal and shelf sea modelling and process studies.