With the launch of the Soil Moisture and Ocean Salinity (SMOS)and American Aquarius,different seasurface salinity (SSS)gridded products have been developed by several institutions,including SMOS Locean L3 data released by the Centre Aval de Traitement des Données SMOS (CATDS )in France,SMOS BEC L4 data releasedby the Barcelona Expert Centre (BEC)in Spain and Aquarius V3.0 CAP L3 data released by NASA JetPropulsion Laboratory(JPL).Based oninsitu salinity measurements,this paper assesses the performances of threesatellite products on their accuracy and ability to depict ocean phenomena.The results show as follows:(1 )Interms of accuracy of products,Aquarius CAP data are of best quality and have stable and low mean bias andRMSE,which have reached the design accuracy in some regions.The deviation of SMOS products is less stable,becoming abnormal in some months.SMOS products data are of relatively high quality in open ocean and low latitudes,but there are great errors in high latitudes,which needs further improvement.(2 )The study of depictingphysical phenomena shows that Aquarius data perform best in depicting the eastern edge of warm pool salinityfront,SMOS BEC data take second place.SMOS Locean data are full of noise in the tropical Pacific,and describethe physical phenomena in poor performance.%自欧洲土壤湿度和盐度卫星SMOS和美国宝瓶座盐度卫星Aquarius相继发射之后,多个数据中心发布了两颗卫星的海表盐度网格化产品,其中包括法国海洋研究院SMOS卫星数据小组发布SMOS Locean L3盐度产品、西班牙巴塞罗那专家中心发布SMOS BEC L4盐度产品和美国宇航局喷气动力实验室发布AquariusV3.0 CAP L3盐度产品.本文利用精确盐度现场观测资料从产品精度和模拟海洋现象能力两个方面对以上3种产品质量进行了评估.研究表明:(1)在精度方面,与盐度现场资料相比,Aquarius CAP产品质量最高,产品盐度偏差和均方根误差全年稳定且偏差较小,部分海域达到了设计精度;SMOS两种卫星产品在全球海域偏差较不稳定,个别月份出现异常偏差值;SMOS产品在低纬和开阔海域的数据质量相对较高,但在高纬海域仍存在较大误差,需要进一步提升;(2)在刻画海洋现象方面,Aquarius产品在热带太平洋较好刻画了淡池东缘盐度锋,SMOS BEC产品的刻画能力次之,SMOS Locean产品在热带太平洋充满了小尺度噪音,描述物理现象方面表现偏差.
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