PREC NOAA全球海陆降水重建数据集（1948-2019）

PREC数据集为1948年至今的2.5º×2.5º全球逐月降水分析资料（降水量距平，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 land precipitation analysis data (PREC/L) is derived via optimal interpolation from in-situ observations at more than 17,000 meteorological stations, utilizing the 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 in-situ observations from island and continental stations. The EOF modes employed are obtained from EOF analysis conducted on the full spatial distribution of the recent satellite-estimated precipitation dataset (OPI, 1979–1998). The current V1.0 version is developed based on the top 8 global EOF modes for each season, along with the top 4 EOF modes of the Atlantic Ocean basin for the remaining regional segments. The land 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.

搜集汇总

背景与挑战

背景概述

PREC NOAA全球海陆降水重建数据集（1948-2019）提供了2.5º×2.5º全球逐月降水分析资料，其中陆地降水数据基于超过17000个台站观测最优插值得到，海洋降水数据则通过EOF重建方法获得。该数据集适用于非盈利研究用途，数据格式为NetCDF，时间分辨率为月，空间分辨率为2.5º×2.5º，覆盖全球陆地和海洋表面。