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Solidification effects of snowfall on sea-ice freeze-up: results from an onsite experimental study

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Title: Solidification effects of snowfall on sea-ice freeze-up: results from an onsite experimental study
Authors: Toyota, Takenobu Browse this author →KAKEN DB
Ono, Takashi Browse this author
Tanikawa, Tomonori Browse this author
Wongpan, Pat Browse this author
Nomura, Daiki Browse this author
Keywords: Crystal alignments
freeze-up process
snowfall effect
surface heat budget
thermodynamic ice growth model
thin sea ice
Issue Date: Dec-2020
Publisher: Cambridge University Press
Journal Title: Annals of glaciology
Volume: 61
Issue: 83
Start Page: 299
End Page: 308
Publisher DOI: 10.1017/aog.2020.49
Abstract: Although the effects of snow during sea-ice growth have been investigated for sea ice which is thick enough to accommodate dry snow, those for thin sea ice have not been paid much attention due to the difficulty in observing them. Observations are complicated by the presence of slush and its subsequent freeze-up, and the surface heat budget might be sensitive to the additional ice thickness. An onsite short-term land fast sea-ice freeze-up experiment in the Saroma-ko Lagoon, Hokkaido, Japan was carried out to examine the effects of snowfall on the structure and surface heat budget of thin sea ice, based on observational results and a 1-D thermodynamic model. We found that snowfall contributes to the solidification of the surface slush layer, contributing ice thickness that is comparable to the snowfall amount and affecting the crystal texture significantly. On the other hand, the basal ice growth rate and turbulent heat flux were not significantly affected, being <3.1 x 10(-8) m s(-1) and 3 W m(-2), respectively. This finding may validate the omission in past studies of snow effect in estimating ice production rates in polynyas and has implications about the reconstruction of growth history from sample analysis.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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