全球逐月标准化陆地水储量干旱指数数据集(2002-2023)
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本数据集提供全球逐月、0.5°X0.5°分辨率的标准化陆地水储量干旱指数(STWSI)数据集,覆盖时间范围是2002年01月至2023年12月。本数据集包含1月,3月,6月,12月,24月,48月等6个时间尺度的水储量干旱指数。数据集由原始数据CSR GRACE 和 GRACE-FO重力卫星遥感反演水储量数据计算而来。GRACE 和 GRACE-FO两颗卫星数据观测缺失的33个月利用奇异谱分析法(SSA)填补得到。干旱指数通过广义极值分布函数拟合得到,不同时间尺度干旱指数分布为原始序列进行该时间尺度的滑动平均后再计算干旱指数得到,具体算法见发明专利ZL202311167476.X(张选泽等,2023)。数据集可为研究青藏高原及全球干旱变化提供数据支撑。
This dataset presents a global monthly standardized terrestrial water storage drought index (STWSI) dataset at a spatial resolution of 0.5°×0.5°, spanning the period from January 2002 to December 2023. It encompasses terrestrial water storage drought indices at six temporal scales: 1-month, 3-month, 6-month, 12-month, 24-month, and 48-month. The dataset is computed from terrestrial water storage data retrieved via remote sensing observations from the CSR GRACE and GRACE-FO gravity satellites. The 33-month data gap present in the GRACE and GRACE-FO satellite records was filled using Singular Spectrum Analysis (SSA). The drought index is obtained via fitting with the generalized extreme value distribution function. For each of the included temporal scales, the corresponding drought index is calculated after first performing a moving average on the original sequence at that specific scale. The detailed algorithm is described in Chinese Invention Patent ZL202311167476.X (Zhang et al., 2023). This dataset can serve as a valuable data resource for studies of drought variations over the Qinghai-Tibet Plateau and across the globe.




