Thivin Abeywickrama¹, Gayan Pathirana¹, Heshani Werellapatha¹, Sudheera Gunasekara², Kyung-Min Noh³ and Dongxiao Wang⁴, (1)University of Ruhuna, Oceanography and Marine Geology, Matara, Sri Lanka, (2)National Aquatic Resources Research and Development Agency, Oceanography Division, Colombo, Sri Lanka, (3)NOAA GFDL, Princeton, United States, (4)Sun Yat-Sen University, School of Marine Sciences, Guangzhou, China