Physically modulated phytoplankton production and export at submesoscales in the oligotrophic South China Sea Basin

作     者：Zhonghua ZHAO Mengdi XU Bangqin HUANG Wenfang LU Hongshuai QI Feng CAI Yuwu JIANG 

作者机构：State Key Laboratory of Marine Environmental ScienceXiamen UniversityXiamen 361102China College of Ocean and Earth SciencesXiamen UniversityXiamen 361102China Fujian Provincial Key Laboratory for Coastal Ecology and Environmental StudiesXiamen UniversityXiamen 361102China National Observation and Research Station for the Taiwan Strait Marine EcosystemXiamen UniversityXiamen 361102China School of Marine SciencesSun Yat-Sen UniversitySouthern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519000China Laboratory of Ocean and Coast GeologyThird Institute of OceanographyMinistry of Natural ResourcesXiamen 361005China 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2024年第67卷第8期

页      面：2681-2698页

核心收录：

学科分类：070702[理学-海洋化学] 07[理学] 0707[理学-海洋科学] 0708[理学-地球物理学] 0713[理学-生态学] 

基　　金：supported by the National Key Research and Development Program of China (Grant No.2022YFA1004404) the National Natural Science Foundation of China (Grant Nos.U22A20579,42306006&41876004) 

主　　题：Submesoscale instability Phytoplankton Nutrient transport BGC-Argo South China Sea 

摘      要：Oceanic submesoscales can significantly influence phytoplankton production and export owing to their similar timescales of *** on two-year Biogeochemical Argo(BGC-Argo) observations,this study investigated the development of submesoscale instabilities,particularly symmetric and mixed-layer baroclinic instabilities,and their impacts on biological production and export in the oligotrophic South China Sea *** the northern basin,near-surface winter blooms consistently cooccurred with seasonally deepened mixed ***,significantly stronger and weaker winter blooms were observed over two consecutive winters within the BGC-Argo observation *** the first winter,symmetric-instability-induced upward nutrient entrainment played a crucial role in initiating the strong winter bloom in early December,when the mixed layer was approximately 20–30 m shallower than the *** bloom occurred approximately 20–30 days earlier than that anticipated owing to the contact between the seasonally deepened mixed layer and mesoscale-cyclone-induced uplifted *** symmetric instability also facilitated the export of fixed phytoplankton carbon from the surface to deeper ***,during the second winter,remarkably intense mixed-layer baroclinic instability associated with an intense mesoscale anticyclone led to more significant shoaling of the mixed layer compared to the nutricline,thus increasing the vertical distance between the two *** this condition,upward nutrient injection,phytoplankton bloom,and carbon export were *** contrast,the BGC-Argo float in the central basin revealed significantly inhibited seasonality of phytoplankton biomass and submesoscale instabilities compared to those in the northern basin,primarily owing to the significantly shallower winter mixed layer.