Quasi-Decadal Circumpolar Variability of Antarctic Sea Ice

• Bajish C. C.

  Graduate School of Environmental Science, Hokkaido University

• Aoki S.

  Institute of Low Temperature Science, Hokkaido University

• Taguchi B.

  Earth Simulator Center, JAMSTEC

• Komori N.

  Earth Simulator Center, JAMSTEC

• Kim S.-J.

  Korea Polar Research Institute, KIOST

Abstract

Decadal variability of Antarctic sea ice and a role of ocean dynamics are examined with sea ice concentration (SIC) and sea surface temperature (SST) derived from satellite microwave observation and obtained by a high resolution coupled ocean-atmosphere-ice general circulation model (CGCM). Sea ice observations revealed a circumpolar variability of sea ice edge (SIE) on quasi-decadal time scale. SST also showed variation on similar time scale with warm (cool) anomaly roughly corresponding to retreat (extension) of SIE at negative (positive) southern annular mode (SAM). CGCM run without anthropogenic forcing and volcanic eruptions revealed that the leading mode of SIC is quasi-circumpolar pattern with a dominant time scale of 12-17 years and the leading mode of SST also has a similar pattern with the SIC showing a high degree of inverse correlation. The modeled SAM significantly correlates with these leading modes of both SIC and SST, representing the same structure with the observations. This indicates that the oceanic natural variability is the key to understand the quasi-decadal variability in sea ice.

Journal

• SOLA

  SOLA 9 (0), 32-35, 2013

  Meteorological Society of Japan

Keywords

• Atmospheric Science

Details

• CRID: 1390001205221224192
• NII Article ID: 130004448594
• DOI: 10.2151/sola.2013-008
• ISSN: 13496476
• Web Site: https://www.jstage.jst.go.jp/article/sola/9/0/9_2013-008/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed