Japan Geoscience Union Meeting 2014

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International Session (Oral)

Symbol A (Atmospheric, Ocean, and Environmental Sciences) » A-CG Complex & General

[A-CG05_30AM2] Continental-Oceanic Mutual Interaction: Global-scale Material Circulation through River Runoff

Wed. Apr 30, 2014 11:00 AM - 12:45 PM 211 (2F)

Convener:*Yosuke Yamashiki(Global Water Resources Assessment Laboratory - Yamashiki Lab. Graduate School of Advanced Integrated Studies in Human Survivability Kyoto University), Swadhin Behera(Climate Variation Predictability and Applicability Research Program Research Institute for Global Change/JAMSTEC, 3173-25 Showa-machi, Yokohama 236-0001), Yukio Masumoto(Japan Agency for Marine-Earth Science and Technology), Yasumasa Miyazawa(Japan Agency for Marine-Earth Science and Technology), Toshio Yamagata(Japan Agency for Marine-Earth Science and Technology), Kaoru Takara(Disaster Prevention Research Institute, Kyoto University), Chair:Yosuke Yamashiki(Global Water Resources Assessment Laboratory - Yamashiki Lab. Graduate School of Advanced Integrated Studies in Human Survivability Kyoto University), Yasumasa Miyazawa(Japan Agency for Marine-Earth Science and Technology), Kaoru Takara(Disaster Prevention Research Institute, Kyoto University)

11:35 AM - 11:50 AM

[ACG05-09] Development of a hydro-ocean coupled model

*Shinichiro KIDA1, Yosuke YAMASHIKI2 (1.Japan Agency for Marine-Earth Science and Technology, 2.Kyoto University)

Keywords:Ocean model, Hydrological model

A new hydro-oceanic coupled model is developed for examining the basic dynamics of river-ocean interaction in estuary zones during high water discharge events. These high frequency and vigorous events are not reproduced in climatological river transport data sets that are often used in ocean circulation models. The new hydro-oceanic model is based on an isopycnal layer model. It treats continental and oceanic water with separate layers but allows dynamical interaction between the two. Mixing between the two layers occurs through a Richardson number criterion. When the model is forced with Radar-Rain gauge analyzed precipitation data around eastern Japan, the model simulates the river discharge of Abukuma river basin that is analogous to observations. The abrupt changes in the water mass transport at upstream and downstream locations are well captured, showing its applicability for hydrological basin analysis. Freshwater plumes that hug along the oceanic coasts are also well captured. We find the model, based on single dynamical core, useful for both hydrological catchment and estuary mixing zone and can be used for examining the impact of weather related events.