Relationship between the tropical Pacific and Indian Ocean sea-surface temperature and monthly precipitation over the central highlands, Vietnam

Authors

  • Tinh Dang Nguyen,

    Corresponding author
    1. Institute of Environment & Resources, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
    2. Faculty of Planning & Management of Water Resources Development Systems, Water Resources University, 175 Tayson, Dongda, Hanoi, Vietnam
    • Faculty of Planning & Management of Water Resources Development Systems, Water Resources University, 175 Tayson, Dongda, Hanoi, Vietnam.
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  • Cintia Uvo,

    1. Department of Water Resources Engineering, Lund University, SE-221 00 Lund, Sweden
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  • Dan Rosbjerg

    1. Institute of Environment & Resources, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
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Abstract

The relationship between monthly sea-surface temperature (SST) in the tropical Pacific and the Indian Ocean and monthly precipitation over the Vietnamese central highlands (VCH) has been investigated by means of singular value decomposition. The seasonal variation of SST plays a critical role in the onset of the monsoon season and convective rain band movement in the inter-tropical convergence zone.

The relationships between precipitation and SST in both oceans vary significantly through the rainy season. In April, ENSO is strongly correlated with precipitation over the VCH, while the Indian Ocean SST only shows a significant correlation with precipitation in the northern VCH. In May, there is no significant relationship between precipitation and SST in either of the oceans. In June, precipitation over the VCH is negatively correlated with the northern Indian Ocean and the southern Pacific SST. Through July to September, no significant relationships were found between the Indian Ocean SST and precipitation patterns. The equatorial central to the eastern Pacific SST, in turn, is positively correlated with precipitation in a small area from the north to the south of the VCH. In October, precipitation over the VCH is strongly related to ENSO and positively correlated with the equatorial eastern Indian Ocean SST. For November, the north-western Pacific as well as the equatorial eastern Indian Ocean SST is positively and strongly correlated with precipitation over the VCH.

Lag-time analyses demonstrate a potential link between the Pacific SST and monthly precipitation patterns through the rainy season from one to three months in advance, and between the Indian Ocean SST and monthly precipitation patterns in October and November from one to two months in advance. The analysed results provide a strong basis for a predictive scheme, but further analysis of skill levels needs to be developed. Copyright © 2007 Royal Meteorological Society

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