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Atmospheric Warming Drives Growth in Arctic Sea Ice: A Key Role for Snow
A Bigdeli1, A T Nguyen1, H R Pillar1
1Oden Institute for Computational Engineering and Sciences University of Texas at Austin Austin TX USA.
Arctic sea ice growth can be delayed by atmospheric warming due to a snow-melt-conductivity feedback. Reduced snow cover enhances ocean heat loss, promoting later ice formation.
Area of Science:
- Climate Science
- Arctic Oceanography
- Sea Ice Physics
Background:
- Arctic sea ice is sensitive to atmospheric warming.
- Feedbacks play a crucial role in regulating sea ice response.
Purpose of the Study:
- To isolate a mechanism for lagged sea ice growth in response to Arctic warming.
- To investigate the role of snow thickness in sea ice dynamics.
Main Methods:
- Utilized a realistic coupled ocean-sea ice model and its adjoint.
- Performed perturbation simulations guided by adjoint model sensitivity.
- Analyzed ocean-ice-snow heat budgets.
Main Results:
- Identified a lagged ice growth mechanism linked to Arctic atmospheric warming.
- Found enhanced ice growth associated with reduced snow thickness.
- Confirmed the crucial role of reduced snow thickness in prolonging ice growth.
Conclusions:
- A snow-melt-conductivity feedback drives delayed Arctic sea ice growth.
- Accurate snow thickness observations are vital for climate models and sea ice forecasts.
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