中国大陆区域基于降水重构陆地水储量变化数据集（2002-2019）

本套数据集连接了CSR RL06 Mascon和JPL RL06 Mascon数据在GRACE和GRACE-FO之间的间断期。以中国区域作为研究区域，数据集包括“Decimal_time”, “lat”, “lon”, “time”, “time_bounds”, “TWSA_REC”和“Uncertainty”7个参数。其中“Decimal_time”对应为十进制时间，2002年4月-2019年12月份一共191个月（GRACE数据163个月，GRACE-FO数据17个月，GRACE与GRACE-FO间断期11个月，一共191个月。我们并未弥补GRACE或GRACE-FO各自数据之间存在的个别月份的缺失数据）；“lat”对应为数据纬度范围；“lon”对应为数据经度范围；“time”对应为数据从2002年1月1日起的年积日；“time_bounds”；对应为数据每个月开始日期和结束日期所对应的年积日。“TWSA_REC”为2002年4月-2019年12月份每个月的中国区域陆地水储量变化；“Uncertainty”是数据与CSR RL06 Mascon产品之间的不确定性。使用GRACE卫星重力数据CSR GRACE/GRACE-FO RL06 Mascon Solutions (version 02)、中国逐日网格降水量实时分析系统（1.0版）数据、CN05.1温度数据等数据集，通过建立降水重构模型，并考虑Mascon产品的季节项和趋势项，得到中国区域基于降水重构陆地水储量变化数据集。数据质量整体较好，全国大部分区域的误差在5cm以内。本数据集补充了GRACE与GRACE-FO卫星中间一年多的数据间断期，为中国区域长期的陆地水储量变化分析提供了完整的时间序列。本数据集与CSR RL06 Mascon产品一样扣除了2004.0000 - 2009.999间的平均值，所以可以直接提取本数据的第164-174个月（即2017年7月至2018年5月）的数据作为间断期的陆地水储量变化的估计。JPL RL06 Mascon数据间断期的构建与CSR RL06 Mascon方法是一致的。This dataset bridges the data gap between CSR RL06 Mascon and JPL RL06 Mascon products during the interval between GRACE and GRACE-FO missions. Focusing on China as the study area, this dataset contains 7 parameters: "Decimal_time", "lat", "lon", "time", "time_bounds", "TWSA_REC" and "Uncertainty". "Decimal_time" refers to decimal time, covering a total of 191 months from April 2002 to December 2019, which includes 163 months of GRACE data, 17 months of GRACE-FO data, and 11 months of the interval between GRACE and GRACE-FO. No missing individual months in either the GRACE or GRACE-FO datasets have been filled in this dataset. "lat" represents the latitude range of the data; "lon" represents the longitude range; "time" denotes the day of year (DOY) starting from January 1, 2002; "time_bounds" corresponds to the day of year corresponding to the start and end dates of each month. "TWSA_REC" is the terrestrial water storage change (TWSC) over China for each month from April 2002 to December 2019; "Uncertainty" refers to the uncertainty between this dataset and the CSR RL06 Mascon products. This dataset was developed using multiple datasets including GRACE satellite gravity data CSR GRACE/GRACE-FO RL06 Mascon Solutions (version 02), the China Daily Grid Precipitation Real-time Analysis System (Version 1.0) data, and CN05.1 temperature data. Specifically, a precipitation reconstruction model was established, combined with the seasonal and trend terms of the Mascon products, to derive the precipitation-reconstructed terrestrial water storage change dataset over China. The overall data quality is good, with errors within 5 cm over most areas of China. This dataset fills the more-than-one-year data gap between the GRACE and GRACE-FO satellite missions, providing a complete time series for long-term terrestrial water storage change analysis over China. Similar to the CSR RL06 Mascon products, this dataset has subtracted the mean value over the period 2004.0000 to 2009.999, so the data from the 164th to 174th months (i.e., July 2017 to May 2018) can be directly extracted as the estimate of terrestrial water storage change during the interval. The construction of the data gap for JPL RL06 Mascon data follows the same method as that for CSR RL06 Mascon.

搜集汇总

背景与挑战

背景概述

该数据集是一个针对中国大陆区域、时间跨度为2002年至2019年的陆地水储量变化数据集，通过降水重构模型连接了GRACE和GRACE-FO卫星数据的间断期，补充了关键缺失数据。它包含7个参数，如时间、经纬度、水储量变化和不确定性，基于GRACE卫星重力数据和降水量等来源，数据质量较高，大部分区域误差在5cm以内，为中国区域长期水储量变化分析提供了完整的时间序列。