文献类型：期刊文献

英文题名：Remote Sensing and Argo Float Observations Reveal Physical Processes Initiating a Winter-Spring Phytoplankton Bloom South of the Kuroshio Current Near Shikoku

作者：Wang, Tongyu[1,2];Chen, Fajin[2];Zhang, Shuwen[1];Pan, Jiayi[3];Devlin, Adam Thomas[3];Ning, Hao[2];Zeng, Weiqiang[2]

机构：[1]Shantou Univ, Inst Marine Sci, Shantou 515063, Peoples R China;[2]Guangdong Ocean Univ, Coll Ocean & Meteorol, Zhanjiang 524088, Peoples R China;[3]Jiangxi Normal Univ, Sch Geog & Environm, Nanchang 330022, Jiangxi, Peoples R China

年份：2020

卷号：12

期号：24

起止页码：1

外文期刊名：REMOTE SENSING

收录：SCI-EXPANDED(收录号：WOS:000603282200001)、、EI(收录号：20205309705094)、Scopus(收录号：2-s2.0-85098266522)、WOS

基金：This research was funded by Scientific Research Start-Up Foundation of Shantou University (NTF20006), Innovation and Entrepreneurship Project of Shantou (2021112176541391), Guangdong Natural Science Foundation of China (2016A030312004), National Natural Science Foundation of China (U1901213, 40876005, 41676008) and Scientific Research Start-Up Foundation of Jiangxi Normal University.

语种：英文

外文关键词：remote sensing data; phytoplankton bloom; chlorophyll a; deep winter mixing; ekman pumping; nutrient

外文摘要：BIO-Argo float (chlorophyll a (Chl-a), temperature, and salinity profiles) and remote sensing data (Chl-a, photosynthetic available radiation (PAR), and wind) located south of the Kuroshio current near Shikoku from September 2018 to May 2019 were used to study phytoplankton bloom and their mechanisms of development in open oceans. Results show that higher (lower) Chl-a concentrations are correlated with a deeper (shallower) mixed layer (R-Pearson = 0.77, R-crit = 0.12 (alpha = 0.05, n = 263)) compared to the average of Chl-a and mixed layer depth (0.13 mg/m(3) and 105 m). The average net accumulation rates (r) of phytoplankton were close to 0.08 d(-1). An increasing r corresponds to a gradually increasing surface Chl-a (S (Chl-a): 0-20 m average Chl-a) and integrated Chl-a inventory (I (Chl-a): integrated Chl-a from surface to euphotic depth). These phenomena indicate that the mechanism of winter-spring phytoplankton blooms is consistent with the dilution-recoupling hypotheses (DRH). During the bloom formation, winter deep mixing and eddy-wind Ekman pumping are enhanced by a strong winter monsoon. The enhancement may disturb predator-prey interactions and dilute zooplankton in deep mixed layers. Moreover, winter deep mixing and eddy-wind Ekman pumping can cause the nutrients to be transported into the euphotic layer, which can promote the growth of phytoplankton and increase grazing. During the bloom extinction, the stratification strengthens and the intensity of light increases; this increases grazing and nutrient consumption, and decreases the phytoplankton bloom significantly (S (Chl-a) and I (Chl-a) increase by 0.3 mg/m(3) and 27 mg/m(2), respectively). The output from a biogeochemistry model shows that nutrients are consistent with the temporal distribution of S (Chl-a) and I (Chl-a). Our results suggest that physical processes (deep winter mixing and eddy-wind Ekman pumping) under the DHR framework are critical factors for winter-spring blooms in open oceans with an anticyclone eddy.