The East Asian summer monsoon variability over the last 145 years inferred from the Shihua Cave record, North China

Autor: Xianglei Li, Hai Cheng, Liangcheng Tan, Fengmei Ban, Ashish Sinha, Wuhui Duan, Hanying Li, Haiwei Zhang, Youfeng Ning, Gayatri Kathayat, R. Lawrence Edwards
Jazyk: angličtina
Rok vydání: 2017
Předmět:
Zdroj: Scientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
Druh dokumentu: article
ISSN: 2045-2322
76533840
DOI: 10.1038/s41598-017-07251-3
Popis: Abstract The precipitation variability associated with the East Asian summer monsoon (EASM) has profound societal implications. Here, we use precisely dated and seasonally-resolved stalagmite oxygen isotope (δ18O) records from Shihua Cave, North China to reconstruct the EASM variability over the last 145 years. Our record shows a remarkable weakening of the EASM strength since the 1880s, which may be causally linked to the warming of the tropical Pacific and Indian Oceans. The δ18O record also exhibits a significant ~30-year periodicity, consistent with the instrumental, historical and proxy-based rainfall records from North China, plausibly driven by the Pacific Decadal Oscillation (PDO). Together, these observations imply that ~30-year periodicity is a persistent feature of the EASM, which remains significant with or without anthropogenic forcing. If indeed, the EASM rainfall in North China might decline significantly in the near future, which may affect millions of people in this region.
Databáze: Directory of Open Access Journals
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