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Objective

September 2007 model study demonstrates the importance of surface forcing on sea ice. Objective To demonstrate the CICE model’s simulation of the September 2007 ice retreat event and investigate sensitivity of sea ice extent to surface forcing. Approach

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Objective

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  1. September 2007 model study demonstrates the importance of surface forcing on sea ice Objective To demonstrate the CICE model’s simulation of the September 2007 ice retreat eventand investigate sensitivity of sea ice extent to surface forcing. • Approach • CICE control run includes interannual forcing data for temperature, humidity and wind, 1958-2007, and climatologies for all other data • Compare control with simulations using climatological temperatureand humidity data • Similar tests of alternative melt pond parameterizations show that their details are relatively unimportant compared with atmospheric forcing effects. September 2007 Arctic ice thickness (m). (a) Control run. Other simulations are identical but use (b) climatological humidity data, (c) climatological temperature data, and (d) the topo melt pond scheme. Impact To improve physical simulations of sea ice and polar regions, focus needs to be on the interaction of sea ice with the atmosphere and ocean, particularly the strength of feedbacks. E. C. Hunke. Weighing the importance of surface forcing on sea ice—A September 2007 CICE modeling study. (2014) Q. J. Roy. Met. Soc., published online, DOI:10.1002/qj.2353.

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