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Wu Qiong,Wang Xiaochun,Liang Wenhao,Zhang Wenjun. 2020. Validation and application of soil moisture active passive sea surface salinity observation over the Changjiang River Estuary. Acta Oceanologica Sinica, 39(4):1-8
Validation and application of soil moisture active passive sea surface salinity observation over the Changjiang River Estuary
长江口SMAP海表盐分数据的验证与应用
Received:April 19, 2019  
DOI:10.1007/s13131-020-1542-z
Key words:soil moisture active passive mission  in situ observation  soil moisture and ocean salinity mission  sea surface salinity  Changjiang River (Yangtze River) Estuary  freshwater plume
中文关键词:  SMAP  现场观测  SMOS  海表盐分  长江口  淡水羽流
基金项目:The National Key Research and Development Program of China under contract No. 2016YFC1401600; the Public Science and Technology Research Fund Projects for Ocean Research under contract No. 201505003; the 2015 Jiangsu Program of Entrepreneurship and Innovation Group under contract No. 2191061503801/002.
Author NameAffiliationE-mail
Wu Qiong School of Atmospheric Science, Nanjing University of Information Science and Technology, Nanjing 210044, China  
Wang Xiaochun School of Marine Science, Nanjing University of Information Science and Technology, Nanjing 210044, China
Joint Institute for Regional Earth System Science and Engineering, University of California at Los Angeles, Los Angeles 90095, USA 
xcwang@nuist.edu.cn 
Liang Wenhao School of Marine Science, Nanjing University of Information Science and Technology, Nanjing 210044, China  
Zhang Wenjun School of Atmospheric Science, Nanjing University of Information Science and Technology, Nanjing 210044, China  
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Abstract:
      Using sea surface salinity (SSS) observation from the soil moisture active passive (SMAP) mission, we analyzed the spatial distribution and seasonal variation of SSS around Changjiang River (Yangtze River) Estuary for the period of September 2015 to August 2018. First, we found that the SSS from SMAP is more accurate than soil moisture and ocean salinity (SMOS) mission observation when comparing with the in situ observations. Then, the SSS signature of the Changjiang River freshwater was analyzed using SMAP data and the river discharge data from the Datong hydrological station. The results show that the SSS around the Changjiang River Estuary is significantly lower than that of the open ocean, and shows significant seasonal variation. The minimum value of SSS appears in July and maximum SSS in December. The root mean square difference of daily SSS between SMAP observation and in situ observation is around 3 in both summer and winter, which is much lower than the annual range of SSS variation. In summer, the diffusion direction of the Changjiang River freshwater depicted by SSS from SMAP is consistent with the path of freshwater from in situ observation, suggesting that SMAP observation may be used in coastal seas in monitoring the diffusion and advection of freshwater discharge.
中文摘要:
      本文利用SMAP海表盐分数据,分析了2015年9月至2018年8月长江口附近海表盐分的空间分布和季节变化。 通过与现场观测数据的对比,发现SMAP对盐分的观测结果优于SMOS卫星观测。利用SMAP数据与大通水文站径流量数据对长江口冲淡水引起的盐度变化特征进行了分析。结果表明,长江口附近的表层盐分明显低于外海,呈现出明显的季节变化特征。表层盐分的最小值出现在7月,最大值出现在12月。无论夏季还是冬季,SMAP观测的逐日表层盐分与现场观测的均方根误差均在3 psu左右,远低于表层盐分的年变化范围。此外,夏季,表层盐分刻画的长江口冲淡水的扩散l路径与观测一致,表明SMAP观测的表层盐分可用于研究或监测长江口近岸淡水扩散和平流过程。
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