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 Level 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度的网格化风速数据，其时间平均尺度涵盖日、7日、月及季尺度。本数据集为Aquarius数据集5.0版本的下行轨道每日风速产品，是Aquarius/SAC-D任务官方任务末期公开发布的数据产品。本产品仅使用下行轨道的反演值生成。Aquarius载荷搭载于Aquarius/SAC-D卫星，该卫星由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。该载荷包含三台沿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度、38度及46度。各波束的观测足迹尺寸分别为：76千米（沿轨向，along-track）×94千米（交轨向，cross-track）、84千米×120千米及96千米×156千米，总交轨向幅宽可达370千米。这些辐射计会在1.413 GHz频段下，测量各自对应水平极化（TH，horizontal polarization）与垂直极化（TV，vertical polarization）的亮温。另有一台工作于1.26 GHz频段的散射计（scatterometer），用于测量每个观测足迹内的海洋后向散射信号，该信号可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。