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Article Type:
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Drought over Southeast Asia and Its Association with Large-Scale Drivers

Tan Phan-Van aFaculty of Meteorology, Hydrology and Oceanography, VNU University of Science, Vietnam National University, Hanoi, Vietnam

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Phuong Nguyen-Ngoc-Bich aFaculty of Meteorology, Hydrology and Oceanography, VNU University of Science, Vietnam National University, Hanoi, Vietnam

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Thanh Ngo-Duc bREMOSAT Laboratory, University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology, Hanoi, Vietnam

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Tue Vu-Minh cGlenn Department of Civil Engineering, Clemson University, Clemson, South Carolina

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Phong V. V. Le aFaculty of Meteorology, Hydrology and Oceanography, VNU University of Science, Vietnam National University, Hanoi, Vietnam
eDepartment of Civil and Environmental Engineering, University of California, Irvine, Irvine, California

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Long Trinh-Tuan aFaculty of Meteorology, Hydrology and Oceanography, VNU University of Science, Vietnam National University, Hanoi, Vietnam

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Tuyet Nguyen-Thi dDepartment of Infrastructure and Urban Development Strategies, Vietnam Institute for Development Strategies, Ministry of Planning and Investment, Hanoi, Vietnam

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Ha Pham-Thanh aFaculty of Meteorology, Hydrology and Oceanography, VNU University of Science, Vietnam National University, Hanoi, Vietnam

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Duc Tran-Quang aFaculty of Meteorology, Hydrology and Oceanography, VNU University of Science, Vietnam National University, Hanoi, Vietnam

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Online Publication:
28 Jun 2022
Print Publication:
01 Aug 2022
DOI:
https://doi.org/10.1175/JCLI-D-21-0770.1
Page(s):
4959–4978
Restricted access

Abstract

In this study, the spatiotemporal variability of drought over the entire Southeast Asia (SEA) region and its associations with the large-scale climate drivers during the period 1960–2019 are investigated for the first time. The 12-month Standardized Precipitation Evapotranspiration Index (SPEI) was computed based on the monthly Global Precipitation Climatology Centre (GPCC) precipitation and the monthly Climate Research Unit (CRU) 2-m temperature. The relationships between drought and large-scale climate drivers were examined using the principal component analysis (PCA) and maximum covariance analysis (MCA) techniques. Results showed that the spatiotemporal variability of drought characteristics over SEA is significantly different between mainland Indochina and the Maritime Continent and the difference has been increased substantially in recent decades. Moreover, the entire SEA is divided into four homogeneous drought subregions. Drought over SEA is strongly associated with oceanic and atmospheric large-scale drivers, particularly El Niño–Southern Oscillation (ENSO), following by other remote factors such as the variability of sea surface temperature (SST) over the tropical Atlantic, the Pacific decadal oscillation (PDO), and the Indian Ocean dipole mode (IOD). In addition, there exists an SST anomaly dipole over the Pacific Ocean, which modulates the atmospheric circulations and consequently precipitation over SEA, affecting drought conditions in the study region.

© 2022 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).

Corresponding author: Tan Phan-Van, phanvantan@hus.edu.vn

Abstract

In this study, the spatiotemporal variability of drought over the entire Southeast Asia (SEA) region and its associations with the large-scale climate drivers during the period 1960–2019 are investigated for the first time. The 12-month Standardized Precipitation Evapotranspiration Index (SPEI) was computed based on the monthly Global Precipitation Climatology Centre (GPCC) precipitation and the monthly Climate Research Unit (CRU) 2-m temperature. The relationships between drought and large-scale climate drivers were examined using the principal component analysis (PCA) and maximum covariance analysis (MCA) techniques. Results showed that the spatiotemporal variability of drought characteristics over SEA is significantly different between mainland Indochina and the Maritime Continent and the difference has been increased substantially in recent decades. Moreover, the entire SEA is divided into four homogeneous drought subregions. Drought over SEA is strongly associated with oceanic and atmospheric large-scale drivers, particularly El Niño–Southern Oscillation (ENSO), following by other remote factors such as the variability of sea surface temperature (SST) over the tropical Atlantic, the Pacific decadal oscillation (PDO), and the Indian Ocean dipole mode (IOD). In addition, there exists an SST anomaly dipole over the Pacific Ocean, which modulates the atmospheric circulations and consequently precipitation over SEA, affecting drought conditions in the study region.

© 2022 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).

Corresponding author: Tan Phan-Van, phanvantan@hus.edu.vn

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