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Lake ice formation processes and thickness evolution at Lake Abashiri, Hokkaido, Japan

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Title: Lake ice formation processes and thickness evolution at Lake Abashiri, Hokkaido, Japan
Authors: Ohata, Yu Browse this author
Toyota, Takenobu Browse this author →KAKEN DB
Shiraiwa, Takayuki Browse this author →KAKEN DB
Keywords: ice thickness measurements
lake ice
snow/ice surface processes
thermodynamic modelling
Issue Date: 2-Nov-2016
Publisher: Cambridge University Press
Journal Title: Journal of glaciology
Volume: 62
Issue: 233
Start Page: 563
End Page: 578
Publisher DOI: 10.1017/jog.2016.57
Abstract: Lake-ice properties at Lake Abashiri, Hokkaido, Japan, were examined using field observations and a 1-D thermodynamic model to clarify formation processes at mid-latitudes subject to significant snowfall as well as moderate air temperature. At all lake sites examined, the ice comprised two distinct layers: a snow ice (SI) layer on top and a congelation ice (CI) layer below. The SI layer occupied as much as 29-73% of the total ice thickness, a much greater fraction than that reported for lakes at Arctic high latitudes. In the model, the CI growth rate was estimated using the traditional heat budget method, while the SI growth rate was calculated assuming the excessive snowfall from the isostatic balance is converted to SI by a snow compression rate (beta) with the surface melting rate added when the surface heat budget becomes positive. By tuning the value of beta to the observational results of SI thickness, the model outcome successfully reproduced the observational thicknesses of CI and SI, and the break-up date of the lake. Essentially, the model findings show how snow and its formation into SI reduce, by about half, the seasonal variability of total ice thickness.
Rights: © International Glaciological Society 2016
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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