Japan Geoscience Union Meeting 2019

Presentation information

[J] Oral

A (Atmospheric and Hydrospheric Sciences ) » A-OS Ocean Sciences & Ocean Environment

[A-OS21] Physical, biogeochemical, and ecological aspects and their mutual relations in the Indian Ocean

Sun. May 26, 2019 3:30 PM - 5:00 PM 303 (3F)

convener:Yukio Masumoto(Graduate School of Science, The University of Tokyo), Hiroaki Saito(Atmosphere and Ocean Research Institute, The University of Tokyo), Iwao Ueki(JAMSTEC Japan Agency for Marine-Earth Science and Technology), Chairperson:Yukio Masumoto

4:45 PM - 5:00 PM

[AOS21-06] Observed subsurface Chlorophyll maximum in the tropical eastern Indian Ocean during KH18-6 Leg3 cruise

*Iwao Ueki1, Kosei Sasaoka1 (1.JAMSTEC Japan Agency for Marine-Earth Science and Technology)

Keywords:The eastern Indian Ocean, Chlorophyll, Eddy

To enhance interdisciplinary understanding of the eastern Indian Ocean upwelling study, R/V Hakuho-Maru KH18-6 cruise has been conducted in November-December 2018. During the Leg-3 cruise; started from Jakarta in 06 December and arrived at Fremantle in 29 December, physical, chemical and biogeochemical observations at more than 30 stations along 3 sections have been conducted. During the Leg 3 cruise, climate condition of the Indian Ocean became a neutral condition after positive Indian Ocean Dipole event. At the eastern section from the station 22 (12oS, 112.5oE) to station 34 (24oS, 111oE), we can capture predominance of eddy activity at around 16oS. In terms of chlorophyll distribution, subsurface maximum were recognized at the all stations. However, the distribution was modified in associated with the eddy activity. The details will be shown in the presentation.