Japan Geoscience Union Meeting 2018

Presentation information

[EJ] Poster

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

[A-OS14] Freshwater discharge from rivers and estuaries to the ocean

Tue. May 22, 2018 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Shinichiro Kida(Research Institute for Applied Mechanics, Kyushu University), Dai Yamazaki(Institute of Industrial Sciences, The University of Tokyo), Humio Mitsudera(北海道大学低温科学研究所, 共同), Yosuke Alexandre Yamashiki(Earth & Planetary Water Resources Assessment Laboratory Graduate School of Advanced Integrated Studies in Human Survivability Kyoto University)

[AOS14-P04] Potential impacts of the freshwater flux from the Kamchatka Peninsula on the dense shelf water formation in the Sea of Okhotsk

*Humio Mitsudera1 (1.Institute of Low Temperature Science, Hokkaido University)

Keywords:Kamchatska Peninsula, atmosphere-land-ocean linkage, freshwater transport

Dense Shelf Water (DSW) in the Sea of Okhotsk forms over the northern continental shelf. DSW entrains a lot of materials, such as dissolved oxygen, CO2 and iron, from the continental shelf region and carries them to the North Pacific through the intermediate layer. The overturning circulation associated with DSW is controlled by salinity. One of primary controlling factors of salinity is brine rejection when sea ice forms. Another controlling factor is salinity of the surface inflow to the continental shelf region from the North Pacific Ocean. In this project, we focus on the latter, with a special attention to the effects of freshwater flux from the Kamchatka Peninsula. We found in a previous study that the precipitation over the Kamchatka Peninsula is significantly correlated with the DSW salinity, where the precipitation can explain one-third of the variability of DSW salinity. We aim to quantify the effects of this freshwater process throughout atmosphere, land and ocean. In this poster presentation, results of a numerical experiment on the DSW overturn in the presence or absence of the riverine freshwater flux from the Kamchatka Peninsula are discussed.