Summary of Abstract Submission

Abstract Submission No. IO50-04-0025PresentationOral

OBSERVATIONAL STUDY ON EASTERN INDIAN OCEAN UPWELLING AND INDIAN OCEAN DIPOLE

Iwao Ueki*1, Takanori Horii1, Kentaro Ando1

1 RCGC/JAMSTEC, Japan

ABSTRACT :

To capture the Indian Ocean dipole (IOD) related features in the southeastern tropical Indian Ocean (SETIO), triangle trans-ocean buoy network (TRITON) moorings were deployed from October 2001. Time series of upper ocean parameters and sea surface fluxes observed with these moorings revealed heat balance within the ocean mixed layer at the eastern pole of IOD. During the positive IOD events, westward cold anomaly advection from east became dominant at the region suggesting importance of upwelling off Sumatra-Java region. Unfortunately we do not have enough observation, which can resolve variability of off Sumatra-Java upwelling. We need more information of ocean condition near coastal region to study about mechanism for IOD development. We also have another research target in the SETIO, which is phytoplankton bloom associated with off-Java meso-scale eddies. In addition to seasonal coastal bloom along the Java coast, off-shore bloom also appeared and enhanced during the positive IOD year. Biogeochemical response to eddy activity should be examined. Although the off-shore blooms were identified by satellite observation, we do not have underwater condition including water property change. To the purpose of advancing these studies, we are planning to in situ observation by research vessel and moorings. We will introduce progress of our plan, which will be associated with the eastern Indian Ocean upwelling research initiative.