DOI: 10.5194/tc-10-2999-2016
Scopus记录号: 2-s2.0-85004109092
论文题名: Quantification of ice production in Laptev Sea polynyas and its sensitivity to thin-ice parameterizations in a regional climate model
作者: Gutjahr O ; , Heinemann G ; , Preußer A ; , Willmes S ; , Drüe C
刊名: Cryosphere
ISSN: 19940416
出版年: 2016
卷: 10, 期: 6 起始页码: 2999
结束页码: 3019
语种: 英语
英文关键词: boundary layer
; climate modeling
; energy flux
; heat transfer
; ice thickness
; open water
; parameterization
; quantitative analysis
; regional climate
; remote sensing
; sea ice
; simulation
; Arctic Ocean
; Laptev Sea
英文摘要: The quantification of sea-ice production in the Laptev Sea polynyas is important for the Arctic sea-ice budget and the heat loss to the atmosphere. We estimated the ice production for the winter season 2007/2008 (November–April) based on simulations with the regional climate model COSMO-CLM at a horizontal resolution of 5km and compared it to remote sensing estimates. A reference and five sensitivity simulations were performed with different assumptions on grid-scale and subgrid-scale ice thickness considered within polynyas, using a tile approach for fractional sea ice. In addition, the impact of heat loss on the atmospheric boundary layer was investigated. About 29.1km3 of total winter ice production was estimated for the reference simulation, which varies by up to +124% depending on the thin-ice assumptions. For the most realistic assumptions based on remote sensing of ice thickness the ice production increases by +39%. The use of the tile approach enlarges the area and enhances the magnitude of the heat loss from polynyas up to +110% if subgrid-scale open water is assumed and by +20% for realistic assumptions. This enhanced heat loss causes in turn higher ice production rates and stronger impact on the atmospheric boundary layer structure over the polynyas. The study shows that ice production is highly sensitive to the thin-ice parameterizations for fractional sea-ice cover. In summary, realistic ice production estimates could be retrieved from our simulations. Neglecting subgrid-scale energy fluxes might considerably underestimate the ice production in coastal polynyas, such as in the Laptev Sea, with possible consequences on the Arctic sea-ice budget. © Author(s) 2016. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75025
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Environmental Meteorology, University of Trier, Behringstraße 21, Trier, Germany
Recommended Citation:
Gutjahr O,, Heinemann G,, Preußer A,et al. Quantification of ice production in Laptev Sea polynyas and its sensitivity to thin-ice parameterizations in a regional climate model[J]. Cryosphere,2016-01-01,10(6)