基于卫星遥感的南海海域POC浓度时空变化特征研究  

Study on Temporal and Spatial Variation Characteristics of POC Concentration in South China Sea Based on Satellite Remote Sensing

作　　者：刘少军[1] 蔡大鑫[1] 赵婷 韩静 佟金鹤 LIU Shaojun;CAI Daxin;ZHAO Ting;HAN Jing;TONG Jinhe(Hainan Institute of Meteorological Science/Key Laboratory of South China Sea Meteorological Disaster Prevention and Mitigation of Hainan Province,Haikou 570203)

机构地区：[1]海南省气象科学研究所/海南省南海气象防灾减灾重点实验室,海口570203

出　　处：《气象科技》2023年第1期134-141,共8页Meteorological Science and Technology

基　　金：海南省重点研发计划项目(ZDYF2021SHFZ062);海南省院士创新平台科研项目(YSPTZX202143)资金资助。

摘　　要：海水中颗粒有机碳(POC)是海洋碳循环的基本变量,在海洋碳循环研究中起着关键作用。根据2003—2020年南海区域遥感数据反演的POC数据集,分析了南海海域POC浓度时空变化规律。研究结果表明:在整个研究区POC的年平均浓度变化范围为76.98~83.91 mg/m^(3);POC浓度分布呈现出近岸高、远海低,主要原因为南海近岸浅水海域POC浓度主要受陆源输入和沿岸流影响,远海区域内POC浓度主要受南海环流和水团控制。在季度上,第1—4季度POC浓度平均值为89.62,72.90,79.22,84.86 mg/m^(3);总体上POC浓度呈现出夏季低、冬季高的趋势,主要原因为南海受到冬季的东北季风和夏季的西南季风影响,影响到南海海水混合层的结构变化,浮游植物在冬季比夏季更为繁盛。在月尺度上,1月POC浓度平均值达到最高值;2—4月POC浓度平均值快速下降,5月POC浓度平均值达到最低值;6—12月POC浓度平均值开始缓慢上升。以上研究结论可为南海碳循环、政府碳达峰、碳中和及应对气候变化等提供决策依据。Particulate Organic Carbon(POC) in seawater is the basic variable of the marine carbon cycle and plays a key role in the study of the marine carbon cycle. The temporal and spatial variation of POC concentration in the South China Sea is analyzed and discussed based on the POC data set retrieved from the remote sensing data from 2003 to 2020. The results show that the annual average concentration of POC varies from 76.98 to 83.91 mg/m^(3) in the whole study area. The POC concentration distribution is high in the nearshore and low in the open sea. The POC concentration in the nearshore and shallow waters of the South China Sea is mainly affected by land-based input and coastal current, and the POC concentration in the open sea area is mainly controlled by the circulation and water mass of the South China Sea. The average POC concentration from the first quarter to the fourth quarter is 89.62, 72.90, 79.22 and 84.86 mg/m^(3). The POC concentration is low in summer and high in winter. The main reason is that the South China Sea is affected by the northeast monsoon in winter and the southwest monsoon in summer, which affects the seawater mixing layer structure in the South China Sea, and phytoplanktons are more prosperous in winter than in summer. On the monthly scale, the POC concentration is the highest in January;the POC concentration decreases rapidly from February to April and reaches the lowest in May;From June to December, the POC concentration begins to rise slowly. The conclusions will provide the decision-making basis for the goverment to deal with such issues as the carbon cycle, carbon peak and carbon neutralization, blue economic development, offshore ecological protection and cope with climate change in the South China Sea.

关 键 词：颗粒有机碳(POC) 浓度 遥感反演 南海 

分 类 号：P49[天文地球—大气科学及气象学] X513[环境科学与工程—环境工程]