NASA MetOp Project

This dataset represents the first historically reprocessed Level 2 coastal ocean surface wind vector climate data record from the Advanced Scatterometer (ASCAT) on MetOp-A sampled on a 12.5 km grid. This coastal dataset utilizes a spatial box filter to generate a spatial average of the Sigma-0 retrievals from the Level 1B dataset and obtains additional winds near the coast. Since the full resolution L1B Sigma-0 retrievals are used, all non-sea retrievals are discarded prior to the Sigma-0 averaging. Each box average Sigma-0 is then used to compute the vector cell wind using the same CMOD7 geophysical model function as in the operational OSI SAF ASCAT wind vector datasets. With this enhanced coastal retrieval, winds are computed as close to ~15 km from t...本数据集为全球首个经历史再处理的、由MetOp-A卫星搭载的高级散射计（Advanced Scatterometer, ASCAT）获取的二级近岸海洋表面风矢量气候数据记录，其格网采样间距为12.5千米。该近岸数据集采用空间盒式滤波器对一级B数据集（Level 1B）的σ⁰（Sigma-0）反演结果进行空间平均，以此获取近岸区域的补充风场数据。由于采用了全分辨率的一级B数据集σ⁰反演结果，因此在进行σ⁰空间平均前，已剔除所有非海洋区域的反演结果。随后，利用每个盒式平均得到的σ⁰数据，结合与业务化OSI SAF ASCAT风矢量数据集一致的CMOD7地球物理模型函数（CMOD7 geophysical model function），计算得到矢量格点风场。通过这种增强型近岸反演方法，风场计算的覆盖范围可逼近至距岸约15千米处……