GRACE-derived spatiotemporal changes of terrestrial water storage in the major plateaus of China

IF 4 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Global and Planetary Change Pub Date : 2025-09-29 DOI:10.1016/j.gloplacha.2025.105102

Dong Wang , Bo-Hui Tang , Yingyun Li , Wei Fu , Zhitao Fu , Zhen Zhang , Zhongxi Ge

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引用次数: 0

Abstract

Changes in terrestrial water storage (TWS) significantly impact water resource regulation in the major plateaus of China (MPC). Traditional monitoring methods are limited by high costs and sparse site distribution, restricting large-scale and high-resolution assessments. The Gravity Recovery and Climate Experiment (GRACE) and its follow-on mission offer an effective approach for TWS observation in these areas. This study examines the spatiotemporal features of TWS in MPC from 2002 to 2022 by recovering low-degree signals through coefficient substitution, restoring high-degree signals via combined filtering, and interpolating missing data using Singular Spectrum Analysis (SSA). Key findings reveal a TWS change rate of −0.1 cm/year in the MPC, with semi-annual and annual amplitudes of 0.7 cm and 2.3 cm, respectively, peaking between September and October. TWS variations in the MPC are largest in the Qinghai-Tibet Plateau (QTP) and this dominant signal tends to mask the trends in other plateau regions. Among these, the Yunnan-Kweichow Plateau (YKP) is exhibiting a gradually increasing TWS trend. In the western YKP, TWS declines due to concentrated rainfall, while in its eastern regions, a combination of reduced seasonal precipitation and water migration contributes to an overall upward trend. These findings provide critical insights for regional water resource management and policy formulation.

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基于grace的中国主要高原陆地储水量时空变化研究

陆地储水量的变化对中国主要高原地区的水资源调节具有重要影响。传统的监测方法受成本高、场地分布稀疏等因素的限制，限制了大规模、高分辨率的评估。重力恢复与气候试验（GRACE）及其后续任务为这些地区的TWS观测提供了有效途径。本文通过系数替换恢复低度信号、组合滤波恢复高度信号、奇异谱分析（SSA）插值缺失数据，分析了2002 - 2022年MPC地区TWS的时空特征。主要研究结果表明，MPC的TWS变化率为- 0.1 cm/年，半年度和年度振幅分别为0.7 cm和2.3 cm，在9月至10月达到峰值。其中，云贵高原（YKP）呈现出TWS逐渐增大的趋势。在青山带西部，由于降雨集中，TWS下降，而在青山带东部，季节性降水减少和水分迁移共同作用，TWS总体呈上升趋势。这些发现为区域水资源管理和政策制定提供了重要的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Global and Planetary Change 地学天文-地球科学综合

CiteScore

7.40

自引率

10.30%

发文量

226

审稿时长

63 days

期刊介绍： The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems. Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged. Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.