Abstract
Under the controversial background of “Northwestern China is gradually developing towards warm and humid”, how hydrological drought responds to meteorological drought at the endorheic basin is of great significance. To address this problem, we first analyzed the spatiotemporal variation of meteorological and hydrological droughts at Tarim Basin River from 1960 to 2014 by using the daily standardized precipitation index (SPI) and daily standardized terrestrial water storage index (SWSI) based on the reanalysis data. Thereafter, we explored the spatiotemporal response of hydrological drought to meteorological drought on the multi-time scale by using the cross-wavelet transform method, Ensemble Empirical Mode Decomposition (EEMD), and correlation analysis. We find that: (1) both meteorological and hydrological droughts signified a gradually weakened trend in time; (2) meteorological and hydrological drought have significant resonance periods on the 10-month time scale and the 8-year time scale; (3) hydrological drought generally lags behind the meteorological drought by 7 days in plains areas, while it can last as long as several months or even a year in mountainous areas.
Highlights
The entire basin is split by the Tarim River, which constitutes nine major river systems, namely the Aksu, Weigan, Dina, Kai-kong, Qarqan, Keliya, Hotan, Yarkand, and Kashgar rivers
The minimum value of Standardized Precipitation Index (SPI) is between −1.0 and −1.5, indicating that the average meteorological drought in the entire basin is moderate drought, while the minimum value of SWSIafter is between
The formation of the two types of drought is complex and diverse; this study explored the response of hydrological drought to meteorological drought from the perspective of multi-time scales
Summary
The economic losses caused by droughts in the United
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