A novel daily-scale index for detecting drought-flood abrupt alternation events: Proof from Pearl River Basin, China

IF 4.5 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Atmospheric Research Pub Date : 2024-12-24 DOI:10.1016/j.atmosres.2024.107892

Chengguang Lai, Yuxing Wang, Yuxiang Zhao, Zhaoli Wang, Xushu Wu, Xiaoyan Bai

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引用次数: 0

Abstract

As a serious compound disaster, the drought-flood abrupt alternation (DFAA) has become consensus and is urgent to be analyzed. Previous studies have mainly focused on the monthly time scale, making it difficult to reveal the detailed variation characteristics of DFAA. To address this limitation, this study proposed a daily-scale method that combines narrow and generalized DFAA intensity to identify, screen, and evaluate DFAA phenomena. Taking the Pearl River Basin (PRB) as an example, the results obtained through the new method demonstrate good agreement with the observed reality. The DFAA events mainly occurred in the west, east and southeast of PRB, and their frequency, coverage, intensity and average duration exhibit a significant upward trend, while the maximum duration shows an insignificant downward trend. Generally, the proposed method offers a clear representation of the evolution of DFAA events, and enables comprehensive analysis and comparison of DFAA events within the same watershed, thereby promoting a deeper understanding of DFAA on a broader temporal scale.

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来源期刊

Atmospheric Research 地学-气象与大气科学

CiteScore

9.40

自引率

10.90%

发文量

460

审稿时长

47 days

期刊介绍： The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.