Aquarius Official Release Level 3 Wind Speed Standard Mapped Image Descending Daily Data V5.0

Aquarius Level 3 ocean surface wind speed standard mapped image data contains gridded 1 degree spatial resolution wind speed data averaged over daily, 7 day, monthly, and seasonal time scales. This particular data set is the Daily, Descending wind speed product for version 5.0 of the Aquarius data set, which is the official end of mission public data release from the AQUARIUS/SAC-D mission. Only retrieved values for Descending passes have been used to create this product. 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.Aquarius 3级海洋表面风速标准映射图像数据集包含空间分辨率为1°的网格化风速数据，时间尺度涵盖日、7日、月及季节平均。本数据集为Aquarius数据集5.0版本的每日下行轨道风速产品，是Aquarius/SAC-D任务正式的任务末期公开发布数据。本产品仅使用下行轨道的反演值生成。Aquarius载荷搭载于美国国家航空航天局（National Aeronautics and Space Administration, NASA）与阿根廷国家空间活动委员会（Comision Nacional de Actividades Espaciales, CONAE）合作研制的Aquarius/SAC-D卫星。该载荷包含三台推扫式排列的辐射计，其相对于轨道阴影面的入射角分别为29°、38°和46°。各波束的观测足迹（footprint）分别为：沿轨向76千米×交轨向94千米、84千米×120千米以及96千米×156千米，总交轨向幅宽达370千米。三台辐射计将在1.413 GHz频段下，分别测量水平极化（TH）与垂直极化（TV）对应的亮温。另有一台工作于1.26 GHz的散射计，测量每个观测足迹内的海洋后向散射信号，用于盐度反演过程中的海面粗糙度校正。该散射计的幅宽约为390千米。