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The Ocean and Atmosphere in the Maritime Continent and Their Impacts
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Tidal Mixing Signatures in the Southeast Asia Waters from High-Resolution Sea Surface Temperature Data
Wednesday 9th @ 1130-1150, Conference Room 4
R. Dwi Susanto* , University of Maryland, college Park, Maryland, United States
Richard D. Ray, NASA Goddard Space Flight Center, Greenbelt, Maryland, United States
Presenter Email: dwisusa@umd.edu |
| Southeast Asia waters play pivotal role in global ocean circulation and climate because they provide the only connection between tropical Pacific and Indian Oceans (known as Indonesian Throughflow/ITF) and center for atmospheric convection. The ITF directly impacts the basin mass, heat, and freshwater budgets of the Pacific and Indian Oceans with possible feedback to the ENSO and monsoon climate phenomena. Due to complex coastline geometry and narrow passages, Southeast Asian seas are known for strong tidal mixing. Along the pathways from the Pacific to Indian Oceans, waters undergo strong mixing and air sea interactions. Tidal mixing plays important roles in the transformation of Pacific water and ITF water which strongly influences sea surface temperature, air-sea interaction, and stratification to the Indian Ocean. Numerical models and limited in situ observations have confirmed the occurrences of tidal mixing in these regions.
However, detailed spatial characteristics of nonlinear interactions between tidal signals and tide-induced mixing in the Southeast Asia water have been poorly understood. Multi Ultra High-Resolution Sea Surface Temperature (MURSST) data are used to extract tidal mixing signatures. Nonlinear interactions between semidiurnal and diurnal signals generate fortnightly (spring-neap cycle) tidal signals that can be detected from high spatial and temporal resolution of SST. Our results show that mixing signatures Indonesia and Philippine seas mostly are localized in narrow passages such as Sulu Sills, Nusa Tenggara Island chain (from Bali to Timor islands), Lifamatola passage. Since semidiurnal signals are dominant in these regions, the fortnightly signal (MSf) with period of 14.77 days are stronger. Meanwhile, in the South China Sea, the tidal mixing signatures are along the coastline of China and Luzon Strait with near-fortnightly signal (Mf) with a period of 13.67 is stronger due to nonlinear interactions between diurnal signals.
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