DOI: 10.5194/tc-9-1129-2015
Scopus记录号: 2-s2.0-84930667752
论文题名: Air temperature variability over three glaciers in the Ortles-Cevedale (Italian Alps): Effects of glacier fragmentation, comparison of calculation methods, and impacts on mass balance modeling
作者: Carturan L ; , Cazorzi F ; , De Blasi F ; , Dalla Fontana G
刊名: Cryosphere
ISSN: 19940416
出版年: 2015
卷: 9, 期: 3 起始页码: 1129
结束页码: 1146
语种: 英语
英文关键词: accuracy assessment
; air temperature
; boundary layer
; cooling
; mass balance
; spatiotemporal analysis
; Alps
; Italy
英文摘要: Glacier mass balance models rely on accurate spatial calculation of input data, in particular air temperature. Lower temperatures (the so-called glacier cooling effect) and lower temperature variability (the so-called glacier damping effect) generally occur over glaciers compared to ambient conditions. These effects, which depend on the geometric characteristics of glaciers and display a high spatial and temporal variability, have been mostly investigated on medium to large glaciers so far, while observations on smaller ice bodies (< 0.5 km2) are scarce. Using a data set from eight on-glacier and four off-glacier weather stations, collected in the summers of 2010 and 2011, we analyzed the air temperature variability and wind regime over three different glaciers in the Ortles-Cevedale. The magnitude of the cooling effect and the occurrence of katabatic boundary layer (KBL) processes showed remarkable differences among the three ice bodies, suggesting the likely existence of important reinforcing mechanisms during glacier decay and fragmentation. The methods proposed by Greuell and Böhm (1998) and Shea and Moore (2010) for calculating on-glacier temperature from off-glacier data did not fully reproduce our observations. Among them, the more physically based procedure of Greuell and Böhm (1998) provided the best overall results where the KBL prevails, but it was not effective elsewhere (i.e., on smaller ice bodies and close to the glacier margins). The accuracy of air temperature estimations strongly impacted the results from a mass balance model which was applied to the three investigated glaciers. Most importantly, even small temperature deviations caused distortions in parameter calibration, thus compromising the model generalizability. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75291
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 Land, Environment, Agriculture and Forestry, University of Padova, Viale dell'Università 16, Legnaro, Padova, Italy; Department of Agriculture and Environmental Sciences, University of Udine, via delle Scienze 208, Udine, Italy
Recommended Citation:
Carturan L,, Cazorzi F,, De Blasi F,et al. Air temperature variability over three glaciers in the Ortles-Cevedale (Italian Alps): Effects of glacier fragmentation, comparison of calculation methods, and impacts on mass balance modeling[J]. Cryosphere,2015-01-01,9(3)