WATer and global CHange (WATCH) Forcing Data (WFD) - 20th Century

New global sub-daily meteorological forcing data are provided for use with land surface and hydrological-models. The data are derived from the ERA-40 reanalysis product via sequential interpolation to half-degree resolution, elevation correction and monthly-scale adjustments based on CRU (corrected-temperature, diurnal temperature range, cloud-cover) and GPCC (precipitation) monthly observations combined with new corrections for varying atmospheric aerosol-loading and separate precipitation gauge corrections for rainfall and snowfall. The WATCH Forcing data is a twentieth century meteorological forcing dataset for land surface and hydrological models. It consists of three of 6-hourly states of the weather for global half-degree land grid points. It was generated as part of the EU FP 6 project "WATCH" (WATer and global CHange") which ran from 2007-2011. The data was generated in 2 time periods with slightly different methodology: 1901-1957 and 1958-2001, but generally the dataset can be considered as continuous. More details regarding the generation process can be found in the associated WATCH technical report and paper in J. Hydrometeorology. The data covers land points only and excludes the Antarctica.

本数据集提供了一套新的全球子日气象强迫数据，旨在配合陆地表面和水文模型使用。该数据源自ERA-40再分析产品，通过逐级插值至半度分辨率、高程校正以及基于CRU（修正温度、日较差温度、云量）和GPCC（降水量）月度观测值的月尺度调整，并结合了针对不同大气气溶胶负荷的新校正以及针对降雨和降雪的独立降水量计校正而得。WATCH强迫数据集是针对陆地表面和水文学模型的二十世纪气象强迫数据集。它包含了全球半度陆地网格点三个6小时状态气象数据。该数据集作为欧盟第六框架计划项目“WATCH”（WATer and global CHange）的一部分生成，该项目于2007-2011年运行。数据在两个时间段内生成，采用略微不同的方法：1901-1957年和1958-2001年，但总体而言，该数据集可视为连续。关于生成过程的更多详细信息，可在相关WATCH技术报告和《水气象学杂志》中的论文中找到。该数据仅覆盖陆地点，不包括南极洲。