The Influence of the Southern Surge on Rainfall in the Nusa Tenggara Region East In January 2007
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Published: Aug 31, 2016 |
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Keywords: monsun, southerly surge, Intertropical Convergence Zone, phase of monsoon break |
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Abstract
The region withmonsoonal type has rainfall peak on January. However, on January 2007, monsoonal type region has negative anomaly, it means that there is a decresing rainfall. Based on research of Taryono (2012), southerly surge activity influenced to the decreasing of rainfall of monsoon break phase at Java island. Therefore, this research was conducted to understand the relation between southerly surge activity to the decreasing of rainfall in January 2007, especially at East Nusa Tenggara.Southerly surge index was conducted by calculating the variance of daily average meridional wind during January 1980-2010, therefore found the surge indices 11,5 m/s. In January 2007 occurs 2 phenomena of shouterly surge on January, 3rd and 11th 2007. The result both of those days show that the decresing of rainfall in East Nusa Tenggara caused by southerly surge activity which is replacing monsoon through Nortward, therefore causes the decreasing of rainfall in East Nusa Tenggara as the effects of the restrained of moist air from Northen hemispere and the coming of dry and cold air from Shoutern hemispere
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