Japan Geoscience Union Meeting 2016

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Oral

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

[A-CG24] Science in the Arctic Region

Thu. May 26, 2016 10:45 AM - 12:15 PM 304 (3F)

Convener:*Takao Kawasaki(National Institute of Polar Research), Masato Mori(Atmosphere and Ocean Research Institute, University of Tokyo), Hisashi Sato(Department of Environmental Geochemical Cycle Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)), Shun Tsutaki(Arctic Environmental Research Center, National Institute of Polar Research), Hiroyasu Hasumi(Atmosphere and Ocean Research Institute, The University of Tokyo), Chair:Masato Mori(Atmosphere and Ocean Research Institute, University of Tokyo), Hisashi Sato(Department of Environmental Geochemical Cycle Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC))

11:30 AM - 11:45 AM

[ACG24-09] Tropical Forcing of the Early Twentieth Century Warming over the Arctic

*Hiroki Tokinaga1,2, Shang-Ping Xie3, Hitoshi Mukougawa1 (1.Disaster Prevention Research Institute, Kyoto University, 2.The Hakubi Center for Advanced Research, Kyoto University, 3.Scripps Institution of Oceanography, University of California San Diego)

Keywords:Arctic warming, Interdecadal Pacific Oscillation

Land air temperature over the Arctic had warmed by about 1.5C during the early twentieth century (20C). We examine a remote forcing of tropical oceans on the early 20C warming over the Arctic, analyzing new sea surface temperature (SST) products and comparing SST-forced atmospheric general circulation model (AGCM) simulations. The new SST products feature a significant warming in the equatorial Pacific during the early 20C while conventional ones exhibit a broad warming over the tropics and subtropics. Only AGCM simulation forced with the new SST product successfully reproduces the observed Arctic warming and atmospheric teleconnection patterns triggered by the equatorial Pacific warming. They effectively transport heat from the subtropics to the higher latitude, contributing to the Arctic warming during the early 20C.