DOI: 10.5194/tc-8-167-2014
Scopus记录号: 2-s2.0-84893275151
论文题名: Response of ice cover on shallow lakes of the North Slope of Alaska to contemporary climate conditions (1950-2011): Radar remote-sensing and numerical modeling data analysis
作者: Surdu C ; M ; , Duguay C ; R ; , Brown L ; C ; , Fernández Prieto D
刊名: Cryosphere
ISSN: 19940416
出版年: 2014
卷: 8, 期: 1 起始页码: 167
结束页码: 180
语种: 英语
英文关键词: climate conditions
; data set
; environmental conditions
; freezing
; ice cover
; ice thickness
; numerical model
; remote sensing
; satellite imagery
; shallow water
; synthetic aperture radar
; Alaska
; United States
英文摘要: Air temperature and winter precipitation changes over the last five decades have impacted the timing, duration, and thickness of the ice cover on Arctic lakes as shown by recent studies. In the case of shallow tundra lakes, many of which are less than 3 m deep, warmer climate conditions could result in thinner ice covers and consequently, in a smaller fraction of lakes freezing to their bed in winter. However, these changes have not yet been comprehensively documented. The analysis of a 20 yr time series of European remote sensing satellite ERS-1/2 synthetic aperture radar (SAR) data and a numerical lake ice model were employed to determine the response of ice cover (thickness, freezing to the bed, and phenology) on shallow lakes of the North Slope of Alaska (NSA) to climate conditions over the last six decades. Given the large area covered by these lakes, changes in the regional climate and weather are related to regime shifts in the ice cover of the lakes. Analysis of available SAR data from 1991 to 2011, from a sub-region of the NSA near Barrow, shows a reduction in the fraction of lakes that freeze to the bed in late winter. This finding is in good agreement with the decrease in ice thickness simulated with the Canadian Lake Ice Model (CLIMo), a lower fraction of lakes frozen to the bed corresponding to a thinner ice cover. Observed changes of the ice cover show a trend toward increasing floating ice fractions from 1991 to 2011, with the greatest change occurring in April, when the grounded ice fraction declined by 22% (α Combining double low line 0.01). Model results indicate a trend toward thinner ice covers by 18-22 cm (no-snow and 53% snow depth scenarios, α Combining double low line 0.01) during the 1991-2011 period and by 21-38 cm (α Combining double low line 0.001) from 1950 to 2011. The longer trend analysis (1950-2011) also shows a decrease in the ice cover duration by ∼24 days consequent to later freeze-up dates by 5.9 days (α Combining double low line 0.1) and earlier break-up dates by 17.7-18.6 days (α Combining double low line 0.001). © 2014 Author(s). CC Attribution 3.0 License. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74894
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 Geography, Environmental Management and Interdisciplinary Centre on Climate Change (IC3), University of Waterloo, Waterloo, Canada; Climate Research Division, Environment Canada, Toronto, Canada; EO Science, Applications and Future Technologies Department, European Space Agency, Frascati, Italy
Recommended Citation:
Surdu C,M,, Duguay C,et al. Response of ice cover on shallow lakes of the North Slope of Alaska to contemporary climate conditions (1950-2011): Radar remote-sensing and numerical modeling data analysis[J]. Cryosphere,2014-01-01,8(1)