A standardized index for assessing sub-monthly compound dry and hot conditions with application in China
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Published:2021-03-30
Issue:3
Volume:25
Page:1587-1601
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ISSN:1607-7938
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Container-title:Hydrology and Earth System Sciences
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language:en
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Short-container-title:Hydrol. Earth Syst. Sci.
Author:
Li Jun, Wang Zhaoli, Wu Xushu, Zscheischler JakobORCID, Guo Shenglian, Chen Xiaohong
Abstract
Abstract. Compound dry and hot conditions frequently cause large impacts on
ecosystems and societies worldwide. A suite of indices is available for the assessment of droughts and heatwaves, yet there is no index available for
incorporating the joint variability of dry and hot conditions at the sub-monthly scale. Here we introduce a daily-scale index, called the standardized
compound drought and heat index (SCDHI), to assess compound dry-hot
conditions. The SCDHI is based on a daily drought index (the standardized
antecedent precipitation evapotranspiration index – SAPEI), the daily-scale standardized temperature index (STI), and a joint probability distribution method. The new index is verified against real-world compound dry and hot
events and associated observed vegetation impacts in China. The SCDHI can
not only capture compound dry and hot events at both monthly and sub-monthly
scales, but is also a good indicator for associated vegetation impacts. Using the SCDHI, we quantify the frequency, severity, duration, and intensity of compound dry-hot events during the historical period and assess the
ability of climate models to reproduce these characteristics in China. We
find that compound events whose severity is at least light and which last
longer than 2 weeks generally persisted for 20–35 d in China. Southern China suffered from compound events most frequently, and the most severe
compound events were mainly detected in this region. Climate models
generally overestimate the frequency, duration, severity, and intensity of compound events in China, especially for western regions, which can be
attributed to a too strong dependence between the SAPEI and STI in those
models. The SCDHI provides a new tool to quantify sub-monthly
characteristics of compound dry and hot events and to monitor their
initiation, development, and decay. This is important information for
decision-makers and stakeholders to release early and timely warnings.
Funder
National Natural Science Foundation of China
Publisher
Copernicus GmbH
Subject
General Earth and Planetary Sciences,General Engineering,General Environmental Science
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