中国区域连续逐月的陆地水储量数据（2002.04-2023.02）

陆地储水（TWS）作为水循环的主要组成部分，对于水资源管理、灾害监测和农业生产等领域的应用具有重要意义。自2002年4月以来，重力恢复和气候实验卫星(GRACE)及其后续卫星（GRACE-FO）提供了月尺度TWS数据。然而，在GRACE/ GRACE-FO观测期内有35个月的数据缺失。为填补GRACE/ GRACE-FO缺失数据，我们提出了一种计算量小且简单有效的填补方法即奇异谱-主成分分析方法（SSA-PCA），并利用该方法填补了中国陆地区域缺失的TWS数据。结果表明，该方法在西南河流流域（相关系数: 0.71, RMSE: 6.27 cm）、长江流域（相关系数: 0.67, RMSE: 3.52 cm）和松花江流域（SRB, CC: 0.66, RMSE: 7.63 cm）效果最好，其次是海河流域、西北诸河流、东南诸河流域和黄河流域。基于二十年连续的GRACE/ GRACE-FO数据，我们研究了中国十大流域的TWS时空变化特征，结果显示：整个中国陆地区域TWS以每年0.32±0.06 cm的速率在下降，地下水储量（GWS）每年0.54±0.10 的速率在损耗。因此，利用连续无缺失的GRACE/ GRACE-FO数据有助于更深入地了解中国陆地气候变化及其对水资源管理的影响。

Terrestrial Water Storage (TWS), a core component of the water cycle, holds significant importance for applications across water resources management, disaster monitoring, agricultural production and other fields. Since April 2002, the Gravity Recovery and Climate Experiment (GRACE) satellite and its follow-up mission GRACE-FO have provided monthly-scale TWS data. However, 35 months of data are missing during the GRACE/GRACE-FO observation period. To fill the gaps in GRACE/GRACE-FO data, we propose a computationally inexpensive, simple yet effective gap-filling method named Singular Spectrum Analysis-Principal Component Analysis (SSA-PCA), and apply this method to reconstruct the missing TWS data over mainland China. The results demonstrate that this method performs best in the Southwest River Basin (correlation coefficient: 0.71, RMSE: 6.27 cm), Yangtze River Basin (correlation coefficient: 0.67, RMSE: 3.52 cm) and Songhua River Basin (SRB, CC: 0.66, RMSE: 7.63 cm), followed by the Hai River Basin, Northwest Rivers Basin, Southeast Rivers Basin and Yellow River Basin. Based on 20-year consecutive GRACE/GRACE-FO datasets, we investigated the spatiotemporal variation characteristics of TWS in China's ten major basins. The results show that TWS over mainland China as a whole is declining at a rate of 0.32±0.06 cm per year, while Groundwater Storage (GWS) is depleting at a rate of 0.54±0.10 cm per year. Therefore, utilizing continuous and gap-free GRACE/GRACE-FO data facilitates a deeper understanding of terrestrial climate change in China and its impacts on water resources management.

搜集汇总

背景与挑战

背景概述

该数据集提供了中国区域连续逐月的陆地水储量数据，覆盖2002年4月至2023年2月，基于GRACE和GRACE-FO卫星观测，并通过SSA-PCA方法填补了原始数据中的缺失月份，确保了数据的连续性。数据具有月时间分辨率和0.5°-1°空间分辨率，用于分析中国十大流域的水储量时空变化，结果显示陆地水储量整体呈下降趋势，对水资源管理和气候变化研究具有重要意义。