Accelerated Atmospheric to Hydrological Spread of Drought in the Yangtze River Basin under Climate

Author:

Zhang Chengyuan12,Han Zhiming3,Wang Shuo12,Wang Jiankun12,Cui Chenfeng12,Liu Junrong4

Affiliation:

1. College of Water Resources and Architectural Engineering, Northwest A&F University, Xianyang 712100, China

2. Key Laboratory for Agricultural Soil and Water Engineering in Arid Area of Ministry of Education, Northwest A&F University, Xianyang 712100, China

3. College of Natural Resources and Environment, Northwest A&F University, Xianyang 712100, China

4. China Coal Aerial Survey and Remote Sensing Group Co., Ltd., Xi’an 710100, China

Abstract

Persistent droughts pose a threat to agricultural production, and the changing environment worsens the risk of drought exposure. Understanding the propagation of drought in changing environments and assessing possible impact factors can help in the early detection of drought, guiding agricultural production practices. The current study cannot reflect the propagation status of drought to the total terrestrial hydrological drought, so this work creatively investigated the atmospheric to hydrological drought propagation time in the Yangtze River Basin under the dynamic and static perspectives based on the Standardized Precipitation Evapotranspiration Index and the Terrestrial Water Storage Anomalous Drought Index, fine-tuned the time scale to the seasonal scale, and explored the contributing capacity of the variable interactions. The results show that: (1) under the dynamic perspective, while the propagation time is decreasing in the annual scale, the spring season shows the opposite trend; and (2) large variability exists in the timing of drought propagation at spatial scales, with elevation playing the most important influential role, and bivariate interactions contributing stronger explanations compared to single variables. This study highlights the importance of considering the impact of variable interactions and contributes to our understanding of the response of secondary droughts to upper-level droughts, providing valuable insights into the propagation of droughts to total terrestrial hydrologic drought.

Funder

Shaanxi Provincial Science and Technology Department

Publisher

MDPI AG

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