Lopittayakorn (2012) studied the effect on atmospheric and oceanographic parameters in the Gulf of Thailand using ENSO indices with air temperature, monthly rainfall from meteorology station, monthly sea surface temperature and sea surface salinity from the oceanographic buoys during 1997-2003. Moreover, circulation patterns in the Gulf of Thailand were also simulated using the Princeton Ocean model. Input to the model was wind from the NAVY Operation Global Atmospheric Prediction System (NOGAPS), sea surface temperature and sea surface salinity data. The simulated circulation patterns were in accordance with the measured current data from the buoys by 60-70%. In the SW monsoon water flowed out of the gulf via the western side with the counter-clockwise eddy existed at the tip of ca Mau peninsular. While in the NE monsoon, the current meandered from the eastern of the gulf and flowed along the gulf’s western coast into the gulf