Aquarius Official Release Level 3 Sea Surface Salinity Standard Mapped Image Daily Data V4.0

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 4.0 of the Aquarius data set, which is the official end of prime mission public data release from the 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度空间分辨率网格化的SSS日平均、7日平均、月平均和季节平均数据。该特定数据集为Aquarius数据集第4.0版本的每日海洋表面盐度产品，它是AQUARIUS/SAC-D任务官方主要任务期公共数据发布的终结版。Aquarius仪器搭载于AQUARIUS/SAC-D卫星上，该卫星为美国国家航空航天局（NASA）与阿根廷国家太空活动委员会（Comision Nacional de Actividades Espaciales, CONAE）的联合项目。该仪器由三个推扫式辐射计组成，分别位于29度、38度和46度入射角处，相对于轨道阴影侧。辐射计的光斑范围为：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，总横跨宽度为370公里。辐射计在各自的水平和垂直极化（TH和TV）下测量1.413 GHz的亮度温度。一个工作在1.26 GHz的散射计测量每个光斑内的海洋后向散射，用于表面粗糙度校正，以估算盐度。散射计的大致横跨宽度为390公里。