Japan Geoscience Union Meeting 2019

Presentation information

[J] Oral

A (Atmospheric and Hydrospheric Sciences ) » A-CG Complex & General

[A-CG38] Multi-scale ocean-atmosphere interaction in the tropical Indo-Pacific region

Tue. May 28, 2019 10:45 AM - 12:15 PM 104 (1F)

convener:Ayako Seiki(Japan Agency for Marine-Earth Science and Technology), Tomoki Tozuka(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo), Motoki Nagura(Japan Agency for Marine-Earth Science and Technology), Youichi Kamae(Faculty of Life and Environmental Sciences, University of Tsukuba), Chairperson:Tomoki Tozuka(The University of Tokyo), Youichi Kamae(University of Tsukuba)

11:30 AM - 11:45 AM

[ACG38-10] Radar-derived Fresh water flux and its possible impact to the oceanic stratification observed during the Years of the Maritime Continent (YMC)

*Masaki Katsumata1, Biao Geng1, Satoru Yokoi1, Shuichi Mori1, Iwao Ueki1 (1.Japan Agency for Marine-Earth Science and Technology)

Keywords:fresh water flux, oceanic near-surface stratification, YMC (Years of the Maritime Continent)

To investigate the air-land-sea interaction in the Maritime Continent (the world's largest archipelago bridging tropical Indian Ocean and tropical western Pacific), a series of the field campaign “YMC-Sumatra” was conducted as part of the project "Years of the Maritime Continent (YMC)". In “YMC-Sumatra 2017”, we deploy the research vessel "Mirai" at one station near the west coast of Sumatra Island to obtain time series.

The continuous dataset from C-band polarimetric radar is converted to the rainrate (i.e. fresh water flux) by utilizing the data from disdrometers and raingauges. The estimated fresh water flux is compared to the oceanic near-surface stratifications measured by the unmanned surface vehicle “wave glider”. The observed salinity at 0.2m and 6m depths differ under a precipitating event with weak wind (< 5 m/s). The event was followed by the strong wind (>10 m/s) precipitation. After the event, low salinity layer was captured down to 30~40 m depth for more than half days.