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Trends of wet spells over peninsular Malaysia during monsoon seasons

Mohd Deni , Sayang and Jamaludin, Suhaila and Zin, W. Z. W. and Jemain, Abdul Aziz (2009) Trends of wet spells over peninsular Malaysia during monsoon seasons. Sains Malaysiana, 38 (2). 133 -142. ISSN 0126-6039

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Abstract

This study attempts to trace changes in the wet spells over Peninsular Malaysia based on the daily rainfall data from 32 selected rainfall stations which include four sub-regions; northwest, west, south and east, for the period of 1975 to 2004. Six wet spells indices comprising of the main characteristics (maximum, mean, standard deviation), the persistency of two consecutive wet days and the frequency of the short and long duration of wet spells will be used to identify whether or not these indices increase or decrease over Peninsular Malaysia during the monsoon seasons. The study indicates that the eastern areas of the peninsula could be considered as the wettest areas since almost all the indices of wet spells over these areas are higher than over the other regions during the northeast monsoon (NE). The Mann-Kendall (MK) trend test revealed that almost all of the stations located in the eastern areas of the peninsula exhibited a positive trend in the mean, variability and persistency of wet spells indices during the NE monsoon, while a negative trend was observed during the southwest monsoon (SW) in these areas. Moreover, these indices showed a positive trend and at the same time a decreasing trend was observed in the frequency of the long wet spells in most stations located over the west coast of Peninsular Malaysia during the SW monsoon for the period of 1975 to 2004.

Item Type:Article
Uncontrolled Keywords:indices, mann-kendall trend test, persistency, wet spells
Subjects:Q Science > QA Mathematics
Divisions:Science
ID Code:13159
Deposited By: Liza Porijo
Deposited On:20 Jul 2011 09:21
Last Modified:20 Jul 2011 09:21

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