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Pacific Decadal Oscillation Modulates an Interdecadal Trans-Pacific Dry-Wet Seesaw in East Asian and North American Semi-Arid Regions

Wang, Shanshan ， Shu, Xinya ， Huang, Jianping ， Sun, Jinfei ， Shi, Fuxing

2026-04-16 GEOPHYSICAL RESEARCH LETTERS 2026   53(卷), 8(期), (null页)

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    • Semi-arid regions are expanding globally through divergent pathways: in East Asia (EA) via drying of semi-humid lands, while in North America (NA) through wetting of arid areas. This interdecadal dry-wet reversal across the Pacific has remained mechanistically unclear. Here we demonstrate that the Pacific Decadal Oscillation (PDO) drives this climatic seesaw. Analysis of 1948-2022 data reveals the PDO explains approximately 21% of dry-wet variance in EA and 63% in NA. We identify a trans-Pacific teleconnection where PDO phase transitions generate key atmospheric anomalies-a summer Eurasian anticyclone and winter-deepened Aleutian Low-that subsequently modify East Asian monsoons and westerly flows. This atmospheric reorganization alters moisture transport patterns, ultimately producing opposing hydroclimatic trends across the continents. Our work establishes a causal relationship between PDO phase shifts and interdecadal dry-wet reversals, providing crucial mechanistic understanding for predicting long-term hydroclimatic risks in vulnerable semi-arid regions under natural climate variability.

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