南海POC沉积通量时空变化的遥感分析  

Remote sensing analysis of spatiotemporal changes in POC sedimentation flux in the South China Sea

作　　者：林冲 田光辉[1,3] 刘少军[1,3] 辛红雨 赵婷 甘业星 LIN Chong;TIAN Guanghui;LIU Shaojun;XIN Hongyu;ZHAO Ting;GAN Yexing(Hainan Institute of Meteorological Sciences,Haikou,Hainan 570203;Institude of Deep-sea Science and Engineering,Chinese Academy of Sciences,Sanya,Hainan 572000;Hainan Key Laboratory of Meteorological Disaster Prevention and Mitigation in the South China Sea,Haikou,Hainan 570203,China)

机构地区：[1]海南省气象科学研究所,海口570203 [2]中国科学院深海科学与工程研究所,海南三亚572000 [3]海南省南海气象防灾减灾重点实验室,海口570203

出　　处：《热带生物学报》2024年第5期599-607,共9页Journal of Tropical Biology

基　　金：国家自然科学基金项目(42465006);海南省气象局青年基金项目(HNQXQN202202);海南省自然科学基金青年基金项目(421QN373);海南省气象局技术提升项目(HNQXJS202214)。

摘　　要：基于2009—2018年MODIS(Moderate Resolution Imaging Spectroradiometer,MODIS)反演的真光层逐月POC(Particulate Organic Carbon,POC)通量数据和ETOPO5水深数据,通过POC垂直迁移公式反演结合经验阈值线性拟合,从宏观角度给出了南海POC沉积通量的时空分布特征。利用MATLAB进行合成分析、误差分析和质量控制等预处理,对比马丁曲线开展非近岸区域(水深大于100 m)相关性验证分析,采用经验阈值及线性拟合修正近岸(水深小于100 m)区域后初步得出以下结论:(1)研究区域内POC沉积通量存在明显的季节变化,POC沉积通量季节平均值分别为春季13.03 mg·m^(-2)·d^(-1)(所测数据为C含量,下同)、夏季14.25 mg·m^(-2)·d^(-1)、秋季15.15 mg·m^(-2)·d^(-1)、冬季17.99 mg·m^(-2)·d^(-1),冬秋季高于春夏季。(2)总体分布呈湾内高于湾外,近岸高于海盆,浅海高于深海的趋势。当深度小于等于50 m、大于50 m且小于等于100 m和大于100 m区域的POC沉积通量平均值分别为46.39、14.28和8.04 mg·m^(-2)·d^(-1)。(3)研究区域全年POC总沉积通量约为19.04(15.72~22.36)Tg·a^(-1)(C含量)。研究结果对了解南海储碳潜力具有重要意义,同时为有关蓝碳经济价值核算研究提供一定参考依据。This study is based on the monthly particulate organic carbon(POC)flux data of the euphotic layer and ETOPO5 water depth data inverted from MODIS(Moderate Resolution Imaging Spectroradiometer,MODIS)from 2009 to 2018 were used for POC vertical migration formula inversion and empirical threshold linear fitting to present the spatiotemporal distribution characteristics of POC sedimentation flux in the South China Sea from a macro perspective.MATLAB is used for data preprocessing such as synthesis analysis,error analysis and quality control of data,and the Martin curve is compared to carry out correlation verification analysis in non-shore areas(water depth greater than 100 m),and empirical thresholds and linear fitting are used to correct offshore areas(water depth less than 100 m).The results showed that there are obvious seasonal changes in POC deposition flux in the study area.The seasonal average values of POC deposition flux are 13.03 mg C·m^(-2)·d^(-1) in spring and 14.25 mg C·m^(-2)·d^(-1) in summer,15.15 mg C·m^(-2)·d^(-1) in autumn,and 17.99 mg C·m^(-2)·d^(-1) in winter,with higher values in winter and autumn than in spring and summer.The overall distribution trend is that the POC deposition flux is higher in the insider than the outside of the bay,higher in the near shore than in the ocean basin,and higher in the shallow sea than in the deep sea.When the depth is less than or equal to 50 m,greater than 50 m,less than or equal to 100 m,and greater than 100 m,the average POC deposition flux is 46.39,14.28,and 8.04 mg C·m^(-2)·d^(-1),respectively.The total POC deposition flux in the study area throughout the year is approximately 19.04(15.72-22.36)Tg C·a^(-1).These results are of great significance for understanding the carbon storage potential of the South China Sea,and at the same time provide a certain reference for research on blue carbon economic value accounting.

关 键 词：沉积通量 马丁曲线 南海 

分 类 号：P732.6[天文地球—海洋科学]