Dataset Information

Deciphering local and regional hydroclimate resolves contradicting evidence on the Asian monsoon evolution.

ABSTRACT: The winter and summer monsoons in Southeast Asia are important but highly variable sources of rainfall. Current understanding of the winter monsoon is limited by conflicting proxy observations, resulting from the decoupling of regional atmospheric circulation patterns and local rainfall dynamics. These signals are difficult to decipher in paleoclimate reconstructions. Here, we present a winter monsoon speleothem record from Southeast Asia covering the Holocene and find that winter and summer rainfall changed synchronously, forced by changes in the Pacific and Indian Oceans. In contrast, regional atmospheric circulation shows an inverse relation between winter and summer controlled by seasonal insolation over the Northern Hemisphere. We show that disentangling the local and regional signal in paleoclimate reconstructions is crucial in understanding and projecting winter and summer monsoon variability in Southeast Asia.

SUBMITTER: Wolf A

PROVIDER: S-EPMC10502020 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature

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Deciphering local and regional hydroclimate resolves contradicting evidence on the Asian monsoon evolution.

Wolf Annabel A Ersek Vasile V Braun Tobias T French Amanda D AD McGee David D Bernasconi Stefano M SM Skiba Vanessa V Griffiths Michael L ML Johnson Kathleen R KR Fohlmeister Jens J Breitenbach Sebastian F M SFM Pausata Francesco S R FSR Tabor Clay R CR Longman Jack J Roberts William H G WHG Chandan Deepak D Peltier W Richard WR Salzmann Ulrich U Limbert Deborah D Trinh Hong Quan HQ Trinh Anh Duc AD

Nature communications 20230914 1

The winter and summer monsoons in Southeast Asia are important but highly variable sources of rainfall. Current understanding of the winter monsoon is limited by conflicting proxy observations, resulting from the decoupling of regional atmospheric circulation patterns and local rainfall dynamics. These signals are difficult to decipher in paleoclimate reconstructions. Here, we present a winter monsoon speleothem record from Southeast Asia covering the Holocene and find that winter and summer rai ...[more]

PMID: 37709741

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Project description:The frequent droughts and floods, closely associated with the Asian summer monsoon (ASM), has profoundly affected the ecological environment and economy in East Asia. While changes in the ASM are closely related to precipitation patterns, the specific mechanism still requires further investigation. This study utilized stalagmite records from the Feilong Cave in southwest China to reconstruct the evolution of the ASM since the Medieval Warm Period (MWP). The results indicated that the ASM strengthened during the MWP and weakened during the Little Ice Age (LIA), with changes in monsoon intensity primarily driven by solar activity and variations in tropical ocean-atmosphere circulation. Different phase combinations of the Atlantic Multidecadal Oscillation, and the Pacific Decadal Oscillation also influenced on the variations of the ASM. During the MWP, with warming of the northern hemisphere landmasses, the ASM intensified, enhancing the long-range transport of moisture from the southwest (Indian summer monsoon), leading to northward shifts of the rain belt in the eastern monsoon region in China and increased precipitation in northern China. Conversely, during the LIA, cooling of the northern hemisphere landmasses led to a weakening of the ASM and reduced southwest moisture transport, resulting in southward shifts of the rain belt in the eastern monsoon China and increased precipitation in southern China. Additionally, the abnormal southward shift of the Western Pacific Subtropical High led to prolonged retention of the rain belt in southern China, causing an increase in monsoonal rainfall in southern China. Comparison with monsoonal Chinese terrestrial proxy records reveals an antiphase relationship between northern and southern parts of the eastern China. During the MWP, the counterparts showed a "wet north-dry south" pattern, while during the LIA, a "wet south-dry north" pattern emerged. Furthermore, proxy records suggest that human activities exacerbated the deterioration of karst ecological environment in southwest China since the Middle Ages.

Dataset Information

Deciphering local and regional hydroclimate resolves contradicting evidence on the Asian monsoon evolution.

Publications

Deciphering local and regional hydroclimate resolves contradicting evidence on the Asian monsoon evolution.

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