Groundwater depletion estimated from GRACE: A challenge of sustainable development in an arid region of Central Asia

Research output: Contribution to journalArticle

Abstract

Under climate change and increasing water demands, groundwater depletion has become regional and global threats for water security, which is an indispensable target to achieving sustainable developments of human society and ecosystems, especially in arid and semiarid regions where groundwater is a major water source. In this study, groundwater depletion of 2003-2016 over Xinjiang in China, a typical arid region of Central Asia, is assessed using the gravity recovery and climate experiment (GRACE) satellite and the global land data assimilation system (GLDAS) datasets. In the transition of a warm-dry to a warm-wet climate in Xinjiang, increases in precipitation, soil moisture and snow water equivalent are detected, while GRACE-based groundwater storage anomalies (GWSA) exhibit significant decreasing trends with rates between-3.61 ± 0.85 mm/a of CSR-GWSA and -3.10 ± 0.91 mm/a of JPL-GWSA. Groundwater depletion is more severe in autumn and winter. The decreases in GRACE-based GWSA are in a good agreement with the groundwater statistics collected from local authorities. However, at the same time, groundwater abstraction in Xinjiang doubled, and the water supplies get more dependent on groundwater. The magnitude of groundwater depletion is about that of annual groundwater abstraction, suggesting that scientific exploitation of groundwater is the key to ensure the sustainability of freshwater withdrawals and supplies. Furthermore, GWSA changes can be well estimated by the partial least square regression (PLSR) method based on inputs of climate data. Therefore, GRACE observations provide a feasible approach for local policy makers to monitor and forecast groundwater changes to control groundwater depletion.

Details

Authors
  • Zengyun Hu
  • Qiming Zhou
  • Xi Chen
  • Deliang Chen
  • Jianfeng Li
  • Meiyu Guo
  • Gang Yin
  • Zheng Duan
Organisations
External organisations
  • University of the Chinese Academy of Sciences
  • Hong Kong Baptist University
  • University of Gothenburg
  • Technical University of Munich
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Oceanography, Hydrology, Water Resources

Keywords

  • Arid region, GLDAS, GRACE, Groundwater variation, Sustainable development, Terrestrial water storage
Original languageEnglish
Article number1908
JournalRemote Sensing
Volume11
Issue number16
Publication statusPublished - 2019
Publication categoryResearch
Peer-reviewedYes