Earth Sciences

Causes of 2022 Pakistan flooding and its linkage with China and Europe heatwaves

C. Hong, A. Huang, et al.

In a striking analysis of the boreal summer of 2022, researchers uncovered the alarming link between Pakistan's extreme flooding and concurrent heatwaves in central China and Europe. The study, conducted by Chi-Cherng Hong and colleagues, highlights unprecedented weather patterns driven by compounding environmental factors. The findings reveal significant trends that may reshape our understanding of climate interactions.

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Abstract

In boreal summer 2022, Pakistan experienced extreme rainfall causing severe flooding. Concurrent heatwaves struck central China and Europe. Analysis reveals the record rainfall stemmed from compounding factors: La Niña-induced strong easterlies, intensified Arabian Sea southerlies (with a recent upward trend), and tropical-extratropical interaction (Europe blocking and Arabian Sea monsoon flow). Wave activity flux and regression analyses identified a Rossby wave-like pattern linking Pakistan's flooding and the heatwaves, differing from known teleconnection patterns. Excessive rainfall positively fed back, enhancing large-scale flow. The 2022 event intensified the 2010 flood, also driven by compounding factors but within a more pronounced upward trend.

Publisher

npj Climate and Atmospheric Science

Published On

Oct 14, 2023

Authors

Chi-Cherng Hong, An-Yi Huang, Huang-Hsiung Hsu, Wan-Ling Tseng, Mong-Ming Lu, Chih-Chun Chang

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