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Open AccessArticle

Drought Assessment using GRACE Terrestrial Water Storage Deficit in Mongolia from 2002 to 2017

1
School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing 210044, China
2
Department of Crop, Soil and Environmental Sciences, Auburn University, AL 36849, USA
3
College of Environment and Planning, Henan University, Kaifeng 475004, China
*
Author to whom correspondence should be addressed.
Water 2019, 11(6), 1301; https://doi.org/10.3390/w11061301
Received: 24 April 2019 / Revised: 12 June 2019 / Accepted: 20 June 2019 / Published: 22 June 2019
(This article belongs to the Section Hydrology)
Climate warming can result in increases in the frequency and magnitude of drought events, leading to water shortages and socioeconomic losses. Gravity Recovery and Climate Experiment (GRACE) satellite data have been used to monitor and estimate drought events. However, there is little information on detecting the characteristics of droughts in Mongolia due to sparse observations. In this study, we estimate the drought conditions in Mongolia using GRACE terrestrial water storage data during 2002–2017. Water storage deficit (WSD) is used to identify the drought event and calculate the water storage deficit index (WSDI). The WSDI was compared with the standardized precipitation index (SPI) and the standardized precipitation evapotranspiration index (SPEI). The results showed that there were two turning points of WSD in 2007 and 2012. Eight drought events were identified and the most severe drought occurred in 2007–2009 lasting for 38 months with a WSDI of −0.98 and a total WSD of −290.8 mm. Overall, the WSD and WSDI were effective in analyzing and assessing the drought severity in a region where hydrological observations are lacking. View Full-Text
Keywords: GRACE; drought index; water storage deficit; Mongolia GRACE; drought index; water storage deficit; Mongolia
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Yu, W.; Li, Y.; Cao, Y.; Schillerberg, T. Drought Assessment using GRACE Terrestrial Water Storage Deficit in Mongolia from 2002 to 2017. Water 2019, 11, 1301.

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