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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Physical drivers of chlorophyll variability in the open South China Sea
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Physical drivers of chlorophyll variability in the open South China Sea

机译：南海开放中叶绿素变化的物理驱动力

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摘要

The variability of chlorophyll a concentration (Chl a) in the open South China Sea (SCS) was examined using observations from two Bio-Argo floats. During the period of September 2014 to August 2015, there was a permanent subsurface Chl a maximum (SCM) in the depth range of 48 to 96 m in the central basin of the SCS. In the northern basin, the SCM disappeared in winter, replaced by enhanced surface layer phytoplankton with high Chl a. The values of the SCM were influenced by the vertical displacement of isotherms. Strong wind forcing and surface cooling were the main physical drivers of high surface Chl a in winter. In the north, stronger wind than in the center, lower sea surface temperature (SST) than in the center, and Kuroshio water intrusion were more favorable for the upward transport of nutrient-rich deep water. A large amount of nitrate could be advected from the Taiwan Strait and shallow continental shelf to the northern basin in winter. A combination of strong wind mixing, surface cooling, Kuroshio water intrusion, and horizontal advection caused the winter surface phytoplankton bloom in the north.
机译：使用来自两个Bio-Argo浮标的观测数据，检查了南中国海（SCS）中叶绿素a浓度（Chl a）的变化。在2014年9月至2015年8月期间，SCS中央盆地的深度在48至96 m范围内存在一个永久的地下最大Chl（SCM）。在北部盆地，SCM在冬季消失，取而代之的是具有较高Chl a的增强的表层浮游植物。 SCM的值受等温线的垂直位移影响。强烈的风力和表面冷却是冬季高表面Chla的主要物理驱动力。在北部，风向比中心强，海面温度（SST）比中心低，黑潮水入侵更有利于营养丰富的深水的向上运输。冬季，从海峡和大陆架浅处到北部盆地，可能会有大量的硝酸盐流入。强风混合，地表降温，黑潮入侵和水平对流相结合，导致北部冬季表层浮游植物开花。

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