Impacts of anthropogenic water regulation on terrestrial water storage over Beijing-Tianjin-Hebei region，China

Terrestrial water storage plays an important role in controlling the exchange of hydrothermal and biochemical substances as a significant part of the global water cycle. Human water regulation affects ecological hydrology process and the sustainable development of economy and environment. In this study, using a high-resolution ( 1km) land surface model that considers groundwater lateral flow and groundwater exploitation based on the Community Land Model version 4.5 (CLM4.5). To investigate the impacts of anthropogenic water regulation on terrestrial water storage (TWS), two simulations using the model were conducted during the period 2000-2012 over the Beijing-Tianjin-Hebei (BTH) region. Results are in good agreement with the observational results of gravity satellites. Groundwater exploitation increases soil moisture and latent heat flux, while decreases surface temperature and sensible heat flux. The annual and inter-annual changes of TWS in BTH are significantly different. Over the last decade, water table deepened and TWS reduced rapidly. The changes are much stronger during summer when there is much more irrigation. TWS is much less in plains than mountainous region caused by over-exploitation.