On the Differences in Ablation Seasons of Arctic and Antarctic Sea Ice

Arctic sea ice is freckled with melt ponds during the ablation season; Antarctic sea ice has few, if any. On the basis of a simple surface heat budget, we investigate the meteorological conditions necessary for the onset of surface melting in an attempt to explain these observations. The low relativ...

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Bibliographic Details
Main Authors: Andreas,Edgar L, Ackley,Stephen F
Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
Format: Text
Language:English
Published: 1982
Subjects:
Meteorology
Snow
Ice and Permafrost
*SEA ICE
*ANTARCTIC REGIONS
*ARCTIC REGIONS
HEAT TRANSFER
RATIOS
COMPARISON
ATMOSPHERIC TEMPERATURE
ENERGY TRANSFER
METEOROLOGICAL DATA
SEASONAL VARIATIONS
COEFFICIENTS
MATHEMATICAL ANALYSIS
MELTING
WIND VELOCITY
HYPOTHESES
SOLAR RADIATION
HEAT BALANCE
HUMIDITY
PONDS
SPRING SEASON
Ablation seasons
AS724
PE61102A
Antarctic
Arctic
The Antarctic
Antarc*
Ice
permafrost
Sea ice
Online Access:http://www.dtic.mil/docs/citations/ADA122454
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA122454
Description
Summary:Arctic sea ice is freckled with melt ponds during the ablation season; Antarctic sea ice has few, if any. On the basis of a simple surface heat budget, we investigate the meteorological conditions necessary for the onset of surface melting in an attempt to explain these observations. The low relative humidity associated with the relatively dry winds off the continent and an effective radiation parameter smaller than that characteristic of the Arctic are primarily responsible for the absence of melt features in the Antarctic. Together these require a surface-layer air temperature above 0 C before Antarctic sea ice can melt. A ratio of the bulk transfer coefficients C sub H/C sub E less than 1 also contributes to the dissimilarity in Arctic and Antarctic ablation seasons. The effects of wind speed and of the sea-ice roughness on the absolute values of C sub H and C sub E seem to moderate regional differences, but final assessment of this hypothesis awaits better data, especially from the Antarctic. (Author)

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