Validation of the multi-satellite merged sea surface salinity in the South China Sea

作     者：Huipeng WANG Junqiang SONG Chengwu ZHAO Xiangrong YANG Hongze LENG Nan ZHOU Huipeng WANG;Junqiang SONG;Chengwu ZHAO;Xiangrong YANG;Hongze LENG;Nan ZHOU

作者机构：College of Meteorology and OceanographyNational University of Defense TechnologyChangsha 410073China Troop 61741PLABeijing 100094China 

出 版 物：《Journal of Oceanology and Limnology》 (海洋湖沼学报（英文）)

年 卷 期：2023年第41卷第6期

页      面：2033-2044页

核心收录：

学科分类：0710[理学-生物学] 07[理学] 0707[理学-海洋科学] 

基　　金：Supported by the National Natural Science Foundation of China(No.42075149)。 

主　　题：sea surface salinity(SSS) South China Sea(SCS) Argo multi-satellite merged data validation 

摘      要：Sea surface salinity(SSS)is an essential variable of ocean dynamics and climate research.The Soil Moisture and Ocean Salinity(SMOS),Aquarius,and Soil Moisture Active Passive(SMAP)satellite missions all provide SSS measurements.The European Space Agency(ESA)Climate Change Initiative Sea Surface Salinity(CCI-SSS)project merged these three satellite SSS data to produce CCI L4SSS products.We validated the accuracy of the four satellite products(CCI,SMOS,Aquarius,and SMAP)using in-situ gridded data and Argo floats in the South China Sea(SCS).Compared with in-situ gridded data,it shows that the CCI achieved the best performance(RMSD:0.365)on monthly time scales.The RMSD of SMOS,Aquarius,and SMAP(SMOS:0.389;Aquarius:0.409;SMAP:0.391)are close,and the SMOS takes a slight advantage in contrast with Aquarius and SMAP.Large discrepancies can be found near the coastline and in the shelf seas.Meanwhile,CCI with lower RMSD(0.295)perform better than single satellite data(SMOS:0.517;SMAP:0.297)on weekly time scales compared with Argo floats.Overall,the merged CCI have the smallest RMSD among the four satellite products in the SCS on both weekly time scales and monthly time scales,which illustrates the improved accuracy of merged CCI compared with the individual satellite data.