Aquarius Official Release Level 3 Sea Surface Salinity Standard Mapped Image Daily Data V2.0

Aquarius Level 3 sea surface salinity (SSS) standard mapped image data contains gridded 1 degree spatial resolution SSS averaged over daily, 7 day, monthly, and seasonal time scales. This particular data set is the Daily sea surface salinity product for version 2.0 of the Aquarius data set, which is the official first release of the operational data from AQUARIUS/SAC-D mission. The Aquarius instrument is onboard the AQUARIUS/SAC-D satellite, a collaborative effort between NASA and the Argentinian Space Agency Comision Nacional de Actividades Espaciales (CONAE). The instrument consists of three radiometers in push broom alignment at incidence angles of 29, 38, and 46 degrees incidence angles relative to the shadow side of the orbit. Footprints for the beams are: 76 km (along-track) x 94 km (cross-track), 84 km x 120 km and 96km x 156 km, yielding a total cross-track swath of 370 km. The radiometers measure brightness temperature at 1.413 GHz in their respective horizontal and vertical polarizations (TH and TV). A scatterometer operating at 1.26 GHz measures ocean backscatter in each footprint that is used for surface roughness corrections in the estimation of salinity. The scatterometer has an approximate 390km swath.

水星级3海洋表面盐度（SSS）标准映射图像数据集包含按1度空间分辨率格网化的SSS平均值，这些平均值分别对应于每日、7日、月度和季节性时间尺度。本数据集特别针对水星级2.0版本，它是AQUARIUS/SAC-D任务操作数据的官方首次发布。AQUARIUS仪器装载在水星级/SAC-D卫星上，该卫星是美国宇航局（NASA）与阿根廷国家太空活动委员会（Comision Nacional de Actividades Espaciales，CONAE）合作研发的。该仪器由三个推帚式排列的辐射计组成，分别对应于相对于轨道阴影侧的29度、38度和46度入射角。辐射计的视场范围分别为：76公里（沿轨）x 94公里（横轨）、84公里 x 120公里和96公里 x 156公里，从而形成一个370公里的总横跨视场。辐射计测量各自水平极化和垂直极化（TH和TV）在1.413 GHz的亮度温度。一个工作在1.26 GHz的散射计测量每个视场内的海洋后向散射，这些数据用于估算盐度时对表面粗糙度的校正。散射计的大致横跨视场为390公里。