Sea-ice in twentieth-century simulations by new MIROC coupled models: A comparison between models with high resolution and with ice thickness distribution

Yoshiki Komuro, Tatsuo Suzuki, Takashi T. Sakamoto, Hiroyasu Hasumi, Masayoshi Ishii, Masahiro Watanabe, Toru Nozawa, Tokuta Yokohata, Teruyuki Nishimura, Koji Ogochi, Seita Emori, Masahide Kimoto

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Sea ice has a large impact on climatic system and its variability. A good reproducibility of the past state of the sea ice in global climate models will reduce uncertainty in future projection. Here, we present sea-ice simulations for new versions of atmosphere-ocean coupled general circulation models, the Model for Interdisciplinary Research on Climate version 4h (MIROC4h) and version 5 (MIROC5), and assess the reproducibility of the sea ice prior to the future projection. The horizontal resolution of MIROC4h is significantly high for a coupled climate model, although its sea-ice component is based on the previous version. MIROC5 employs some improved schemes including subgrid-scale ice thickness distribution. Hindcast simulations of twentieth-century climate by the new models are compared with observations and with the results of previous versions of MIROC. For the Northern Hemisphere, Arctic sea-ice simulations are improved in both MIROC4h and MIROC5 compared with previous models. MIROC5 generally agrees well with observational data, whereas in MIROC4h, the Arctic sea ice is smaller in summer extent and in thickness. Employment of the ice thickness distribution, which allows large heat exchange through subgrid-scale thin ice regardless of the grid-averaged thickness, and relatively high albedo parameters contribute to reproduce more realistic ice thickness in MIROC5 compared with that in MIROC4h. For the Southern Hemisphere, MIROC4h well reproduces the observed ice edge, especially in winter, while MIROC5 underestimates sea-ice extent. Both models indicate decreasing trends in Arctic sea ice in the late twentieth century. A heat budget analysis of the MIROC5 Arctic Ocean suggests that intensification of ice-albedo feedback accelerates the rate of Arctic ice decline.

Original languageEnglish
Pages (from-to)213-232
Number of pages20
JournalJournal of the Meteorological Society of Japan
Volume90
Issue numberA
DOIs
Publication statusPublished - 2012
Externally publishedYes

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ice thickness
twentieth century
sea ice
simulation
climate
ice
albedo
climate modeling
comparison
distribution
heat budget
Southern Hemisphere
interdisciplinary research
general circulation model
global climate
Northern Hemisphere
atmosphere
winter
ocean
summer

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Sea-ice in twentieth-century simulations by new MIROC coupled models : A comparison between models with high resolution and with ice thickness distribution. / Komuro, Yoshiki; Suzuki, Tatsuo; Sakamoto, Takashi T.; Hasumi, Hiroyasu; Ishii, Masayoshi; Watanabe, Masahiro; Nozawa, Toru; Yokohata, Tokuta; Nishimura, Teruyuki; Ogochi, Koji; Emori, Seita; Kimoto, Masahide.

In: Journal of the Meteorological Society of Japan, Vol. 90, No. A, 2012, p. 213-232.

Research output: Contribution to journalArticle

Komuro, Y, Suzuki, T, Sakamoto, TT, Hasumi, H, Ishii, M, Watanabe, M, Nozawa, T, Yokohata, T, Nishimura, T, Ogochi, K, Emori, S & Kimoto, M 2012, 'Sea-ice in twentieth-century simulations by new MIROC coupled models: A comparison between models with high resolution and with ice thickness distribution', Journal of the Meteorological Society of Japan, vol. 90, no. A, pp. 213-232. https://doi.org/10.2151/jmsj.2012-A11
Komuro, Yoshiki ; Suzuki, Tatsuo ; Sakamoto, Takashi T. ; Hasumi, Hiroyasu ; Ishii, Masayoshi ; Watanabe, Masahiro ; Nozawa, Toru ; Yokohata, Tokuta ; Nishimura, Teruyuki ; Ogochi, Koji ; Emori, Seita ; Kimoto, Masahide. / Sea-ice in twentieth-century simulations by new MIROC coupled models : A comparison between models with high resolution and with ice thickness distribution. In: Journal of the Meteorological Society of Japan. 2012 ; Vol. 90, No. A. pp. 213-232.
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