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Nonstationary footprints of ENSO in the Mekong River Delta hydrology

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Title: Nonstationary footprints of ENSO in the Mekong River Delta hydrology
Authors: Watanabe, Takaaki K. Browse this author
Phan, Tung Thanh Browse this author
Yamazaki, Atsuko Browse this author
Chiang, Hong-Wei Browse this author
Shen, Chuan-Chou Browse this author
Doan, Lam Dinh Browse this author
Watanabe, Tsuyoshi Browse this author →KAKEN DB
Issue Date: 7-Dec-2022
Publisher: Nature Portfolio
Journal Title: Scientific reports
Volume: 12
Issue: 1
Start Page: 21186
Publisher DOI: 10.1038/s41598-022-20597-7
Abstract: The Mekong River Delta (MRD) is an essential agricultural area for the worldwide rice supply. Floods and droughts triggered by El Nino southern oscillation (ENSO) have been threatening sustenance in the MRD. Sustainable food supplies require understanding the response of the MRD hydrology to the changing ENSO behaviour in recent decades. Here, we reconstructed the annual rainfall maxima in the MRD using the oceanic paleoclimate proxy from coral skeletons and compared them with ENSO indexes. Annual minima of coral-based seawater oxygen isotope (delta O-18(sw)) correlated with annual rainfall maxima, which allowed to extend rainfall data from 1924 to the recent. The annual rainfall maxima based on delta O-18(sw) negatively correlated with the central Pacific El Nino index. This suggested that La Nina and central Pacific El Nino events lead to heavy and light rainy seasons. The heavy rainy season had more serious impacts in recent decades, which likely increases the flood risk. In contrast, the frequency and rainfall amount of the light rainy season has not changed significantly, although a catastrophic drought has hit the MRD. Our finding concludes that the impact of the ENSO event on MRD hydrology is inconsistent in the past century.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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