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Volume 16, issue 22
Atmos. Chem. Phys., 16, 14343–14356, 2016
https://doi.org/10.5194/acp-16-14343-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 16, 14343–14356, 2016
https://doi.org/10.5194/acp-16-14343-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 18 Nov 2016

Research article | 18 Nov 2016

Effect of retreating sea ice on Arctic cloud cover in simulated recent global warming

Manabu Abe1, Toru Nozawa2, Tomoo Ogura3, and Kumiko Takata3,4 Manabu Abe et al.
  • 1Department of Integrated Climate Change Projection Research, Project Team for Risk Information on Climate Change, Institute of Arctic Climate and Environment Research, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama 236-0001, Japan
  • 2Graduate school of Nature Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
  • 3Center for Global Environmental Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-8506, Japan
  • 4Arctic Environment Research Center, National Institute of Polar Research, 10-3 Midori-cho, Tachikawa 190-8518, Japan

Abstract. This study investigates the effect of sea ice reduction on Arctic cloud cover in historical simulations with the coupled atmosphere–ocean general circulation model MIROC5. Arctic sea ice has been substantially retreating since the 1980s, particularly in September, under simulated global warming conditions. The simulated sea ice reduction is consistent with satellite observations. On the other hand, Arctic cloud cover has been increasing in October, with about a 1-month lag behind the sea ice reduction. The delayed response leads to extensive sea ice reductions because the heat and moisture fluxes from the underlying open ocean into the atmosphere are enhanced. Sensitivity experiments with the atmospheric part of MIROC5 clearly show that sea ice reduction causes increases in cloud cover. Arctic cloud cover increases primarily in the lower troposphere, but it decreases in the near-surface layers just above the ocean; predominant temperature rises in these near-surface layers cause drying (i.e., decreases in relative humidity), despite increasing moisture flux. Cloud radiative forcing due to increases in cloud cover in autumn brings an increase in the surface downward longwave radiation (DLR) by approximately 40–60 % compared to changes in clear-sky surface DLR in fall. These results suggest that an increase in Arctic cloud cover as a result of reduced sea ice coverage may bring further sea ice retreat and enhance the feedback processes of Arctic warming.

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This study has investigated the effect of retreating sea ice on Arctic cloud cover in historical simulations by the coupled atmosphere–ocean general circulation model, MIROC5. This study show that MIROC5 simulates retreating Arctic sea ice in September during the late 20th Century, which causes an increase in Arctic cloud cover in October. Sensitivity experiments using the atmospheric component of MIROC5 also proved that the increase in Arctic cloud cover is due to the retreating sea ice.
This study has investigated the effect of retreating sea ice on Arctic cloud cover in historical...
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