PREC 降水重建数据集(1948.1 至近期)
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PREC 数据集为1948 年至今的2.5º×2.5º 全球逐月降水分析资料（降水距平，mm）。其中， 陆地降水分析数据（ PREC/L） 由超过17000 个台站观测（NOAA/NCDC GHCN Version 2 和NOAA/CPC CAMS 数据集）最优插值得到，海洋降水分析数据（PREC/O）由岛屿和陆地区台站历史观测资料EOF 重建获得。EOF 模态为近期卫星估计资料（OPI, 1979-1998）整个空间分布上的EOF 分析。目前的V1.0 版本是基于各季节的前八个全球EOF 模态以及剩余部分的大西洋区前四个模态。本数据集提供的陆地降水量距平是在1951-1990 气候平均基础上计算得到，而海区降水距平则是在1979-1998 年气候平均基础上计算得到。
The PREC dataset is a global monthly precipitation analysis dataset (precipitation anomaly, unit: mm) with a spatial resolution of 2.5°×2.5° spanning from 1948 to the present. Specifically, the terrestrial precipitation analysis data (PREC/L) is derived via optimal interpolation using observations from more than 17,000 meteorological stations, including NOAA/NCDC GHCN Version 2 and NOAA/CPC CAMS datasets. The marine precipitation analysis data (PREC/O) is reconstructed through Empirical Orthogonal Function (EOF) analysis using historical station observations from islands and continental regions. The EOF modes are derived from the EOF analysis of the full spatial distribution of recent satellite-estimated precipitation data (OPI, 1979–1998). The current V1.0 version is developed based on the first eight global EOF modes for each season, plus the first four EOF modes of the remaining parts of the Atlantic Ocean basin. The terrestrial precipitation anomalies provided in this dataset are calculated against the 1951–1990 climatological mean, while the marine precipitation anomalies are computed using the 1979–1998 climatological mean.
