JpGU-AGU Joint Meeting 2017

Presentation information

[EJ] Oral

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

[A-CG48] [EJ] Science in the Arctic Region

Wed. May 24, 2017 1:45 PM - 3:15 PM 304 (International Conference Hall 3F)

convener:Masato Mori(Research Center for Advanced Science and Technology, the University of Tokyo), Shun Tsutaki(Japan Aerospace Exploration Agency), Shunsuke Tei(Arctic Research Center, Hokkaido University), NAOYA KANNA(Arctic Research Center, Hokkaido University), Chairperson:Masato Mori(Research Center for Advanced Science and Technology, the University of Tokyo), Chairperson:Shun Tsutaki(Japan Aerospace Exploration Agency, Japan Aerospace Exploration Agency)

1:45 PM - 2:00 PM

[ACG48-13] Impact of Arctic sea ice decline on recently observed climate change: a coordinated multi-model study

*Noel S Keenlyside1,2,3, Fumiaki Ogawa1,3, HoNam Hoffman Cheung1,3, Yongqi Gao2,3,1, Torben Koenigk4, Vladimir Semenov5, Lingling Suo2,3, Shuting Yang6, Tao Wang7, Martin Peter King8,3, Guillaume Gastineau9, Sergey Gulev10 (1.Geophysical Institute, University of Bergen , 2.Nansen Environmental and Remote Sensing Center, 3.Bjerknes Cente for Climate Research, 4.Swedish Meteorological and Hydrological Institute, Sweden, 5.Helmholtz centre for ocean research Kiel GEOMAR, Germany, 6.Danish Meteorological Institute, Denmark, 7.Insititute of Atmospheric Physics, China, 8.Uni-Research Climate, Norway, 9.Sorbonne universities, France, 10.Shirshov Institute of Oceanology, Russia)

Keywords:Sea ice decline, Climate Change, Sea ice impact

To what extent the recent sea-ice decline influenced Northern Hemisphere climate trends remains an open question. To address this we perform two atmospheric general circulation model experiments: In both experiments observed daily sea ice cover variations are prescribed for the period 1982 to present, while for SST, one experiment uses observed daily variations and the other the observed climatology. The experiment is performed by six different state-of-the-art AGCMs. Our results show that the observed wintertime temperature trend near the surface is poorly reproduced. The impact of SIC variation seems to be confined near the surface, while SST variation seems a key for temperature trend above. This suggests a necessity to consider the atmospheric poleward energy transport associated with SST variation to understand the observed arctic amplification. The simulations fail to reproduce the observed changes in the Siberian High and Eurasian wintertime cooling. Northern hemisphere surface and zonal mean tropospheric temperature trends are better reproduced in boreal autumn, but the impact of sea ice decline remains limited to the lower troposphere. Other aspects of SIC/SST impact on the observed circulation change such as NAO shall also be discussed.