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Numerical experiments of air–ice drag coefficient and its impact on ice–ocean coupled system in the Sea of Okhotsk

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Abstract

Sensitivity study of the air–ice drag coefficient C Dai is presented with an ice–ocean coupled model for the Sea of Okhotsk. The C Dai × 103 value is varied from 2 to 5 based on the direct measurements in the region. The maximum volume transport of the East Sakhalin Current and the mean sea ice velocity were intensified as C Dai increased. The sensitivity experiment with the ice–water drag coefficient C Diw showed that the East Sakhalin Current volume transport is hardly affected by C Diw but significantly intensified by C Dai. While the ice drift in the off-ice-edge direction was intensified by the increase in C Dai and the decrease in C Diw, the ice edge location was nearly unchanged. This was due to melting caused by the relatively warm water inflow from the North Pacific. That is, sea ice extent in the region is strongly influenced by melting caused by a large ice–ocean heat transfer. In the active melting regions, the ice–ocean heat transfer of more than 100 W/m2 occurred even in mid-winter. This is the same order as the cooling by air in winter, and a heat insulation capacity of sea ice is weakened in such regions.

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Acknowledgments

The authors wish to thank the sea ice group of office of marine prediction, the Japan Meteorological Agency who provided the sea ice analysis, and the objective analysis by the Regional Spectral Value. We also thank the group of Prof. K.I. Ohshima in the Institute of Low Temperature Science, Hokkaido University, who provided the merged observation data of the sea surface salinity.

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Authors and Affiliations

  1. Graduate School of Frontier Science, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba-ken, 2778561, Japan

    Ayumi Fujisaki & Hajime Yamaguchi

  2. Institute of Low Temperature Science, Hokkaido University, Kita-19 Nishi-8 Kita-ku, Sapporo, 060-0819, Japan

    Humio Mitsudera

Authors
  1. Ayumi Fujisaki
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  2. Hajime Yamaguchi
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  3. Humio Mitsudera
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Correspondence to Ayumi Fujisaki.

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Responsible Editor: Leo Oey

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Fujisaki, A., Yamaguchi, H. & Mitsudera, H. Numerical experiments of air–ice drag coefficient and its impact on ice–ocean coupled system in the Sea of Okhotsk. Ocean Dynamics 60, 377–394 (2010). https://doi.org/10.1007/s10236-010-0265-7

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  • DOI: https://doi.org/10.1007/s10236-010-0265-7

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