EMPIRICAL ORTHOGONAL FUNCTION ANALYSIS OF RAINFALL OVER THAILAND AND ITS RELATIONSHIP WITH INDIAN OCEAN DIPOLE
KOSUM CHANSAENGKRACHANG
Department of Mathematics, King Mongkut's University of Technology Thonburi, Bangkok, 10140, Thailand
Centre of Excellence in Mathematics (CEM), CHE, Si Ayutthaya Rd., 10400, Thailand
kosum
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NITIMA ASCHARIYAPHOTHA, USA HUMPHRIES, ANGKOOL WANGWONGCHAI
Department of Mathematics, King Mongkut's University of Technology Thonburi, Bangkok, 10140, Thailand
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PRUNGCHAN WONGWISES
The Joint Graduate School of Energy and Environment, King Mongkut's University of Technology Thonburi, Bangkok 10140, Thailand
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Thailand is in?uenced by the Indian Ocean Dipole (IOD), which is specified as an oscillatory mode of the anomalous sea surface temperature in the Indian Ocean. The Dipole Mode Index (DMI) is an indicator of the east-west temperature gradient across the tropical Indian Ocean, linked to the Indian Ocean Dipole, which is calculated as the di?erence between the western equatorial Indian Ocean (WTIO) and the south eastern equatorial Indian Ocean (SETIO) indices. This study uses the monthly mean rainfall data from the period 1979 - 2008, which was obtained from a total of 80 stations throughout all areas of Thailand. The relationship between the monthly mean rainfall and the DMI was investigated using the Empirical Orthogonal Function Analysis technique. The rainfall variability was extracted into a quite significant measure by the first principal component, which accounted for 57.64% of the total variance. The result from the first principal component is associated with the DMI. It shows that the event of a strong IOD a?ects the rainfall of Thailand.
Keywords: Indian Ocean Dipole (IOD); The Dipole Mode Index (DMI); Empirical Orthogonal Function (EOF) analysis; Rainfall over Thailand.
AMS Subject Classification: 62-07, 86A05
February 22, 2011 11:41 CMIC 2011 4_cmic_kosum
Chiangmai University International Conference 2011
Vol. 1, No. 1 (2010)
Copy Right: CMIC2011/4_cmic_kosum
