Japan Geoscience Union Meeting 2022

Presentation information

Print

[E] Oral

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

[A-CG33] Extratropical oceans and atmosphere

Thu. May 26, 2022 10:45 AM - 12:15 PM 201A (International Conference Hall, Makuhari Messe)

convener:Shoichiro Kido(JAMSTEC Application Lab), convener:Shion Sekizawa(Research Center for Advanced Science and Technology, University of Tokyo), Shota Katsura(Scripps Institution of Oceanography, University of California, San Diego), convener:Yuta Ando(Faculty of Science, Niigata University), Chairperson:Shota Katsura(Scripps Institution of Oceanography, University of California, San Diego), Yuta Ando(Faculty of Science, Niigata University)

11:15 AM - 11:30 AM

[ACG33-08] Decadal cooling trend of the East China Sea in the early 21st century

*Ayumu Miyamoto1, Hisashi Nakamura1, Yu Kosaka1 (1.Research Center for Advanced Science and Technology,The University of Tokyo)

Keywords:East China Sea, decadal variation, stormtrack activity, East Asian winter monsoon, low clouds

The East China Sea (ECS) has significant impacts on the surrounding climate and ecosystem. The ECS is warming much faster than the other oceans under anthropogenic radiative forcing. In the early 21st century, however, the ECS exhibits a significant year-round cooling trend. Here, we investigate this decadal cooling trend with a particular focus on atmospheric forcing. We find that the mechanism is seasonally distinct. In winter, the enhanced East Asian winter monsoon associated with the Warm-Arctic Cold-Eurasian (WACE) pattern brings near-surface cold-air advection, promoting turbulent heat loss from the ECS. In spring, the synoptic eddy activity augments scalar wind speed, thereby reinforcing the turbulent heat loss from the ECS. This enhanced synoptic eddy activity is remotely forced by the cooling trend of the equatorial central Pacific. In summer, low-cloud feedback further acts to promote the ECS cooling trend by reducing shortwave heating.