Effects of sea ice change on the Arctic climate: insights from experiments with a polar atmospheric regional climate model

To get insights into the effects of sea ice change on the Arctic climate, a polar atmospheric regional climate model was used to perform two groups of numerical experiments with prescribed sea ice cover of typical mild and severe sea ice. In experiments within the same group, the lateral boundary co...

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Bibliographic Details
Published in:Journal of water and climate change 2021-11, Vol.12 (7), p.2885-2893
Main Authors: Liu, Xiying, Lu, Chenchen
Format: Article
Language:English
Subjects:
Air temperature
arctic climate
Arctic climate changes
Arctic climates
Arctic sea ice
Atmosphere
Atmospheric stratification
Boundary conditions
Climate
Climate change
Climate models
Datasets
Design of experiments
General circulation models
Ice
Ice cover
Mean sea level
numerical experiment
Numerical experiments
Polar climates
Polar regions
Polar vortex
regional climate model
Regional climate models
Regional climates
Sea ice
Sea ice concentrations
Sea ice effects
Sea level
Sea level pressure
Stability
Stratification
Surface temperature
Surface-air temperature relationships
Temperature
Temperature effects
Weather
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Summary:To get insights into the effects of sea ice change on the Arctic climate, a polar atmospheric regional climate model was used to perform two groups of numerical experiments with prescribed sea ice cover of typical mild and severe sea ice. In experiments within the same group, the lateral boundary conditions and initial values were kept the same. The prescribed sea ice concentration (SIC) and other fields for the lower boundary conditions were changed every six hours. 10-year integration was completed, and monthly mean results were saved for analysis in each experiment. It is shown that the changes in annual mean surface air temperature have close connections with that in SIC, and the maximum change of temperature surpasses 15 K. The effects of SIC changes on 850 hPa air temperature is also evident, with more significant changes in the group with reduced sea ice. The higher the height, the weaker the response in air temperature to SIC change. The annual mean SIC change creates the pattern of differences in annual mean sea level pressure. The degree of significance in pressure change is modulated by atmospheric stratification stability. In response to reduction/increase of sea ice, the intensity of polar vortex weakens/strengthens.
ISSN:2040-2244
2408-9354
DOI:10.2166/wcc.2021.206