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Correction of snow accumulation impacted on air temperature from automatic weather station on the Antarctic ice sheet


Ma, Y and Bian, L and Xiao, C and Allison, I, Correction of snow accumulation impacted on air temperature from automatic weather station on the Antarctic ice sheet, Chinese Journal of Polar Research, 20, (4) pp. 299-309. ISSN 1007-7065 (2008) [Refereed Article]

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The heights of the Automatic Weather Station (AWS) sensors are nominal,which change with the snow accumulation or ablation,over the Antarctic ice sheet. Therefore, the measured data can not be used directly. In this study, air temperatures from three AWSs deployed on the traverse route from Zhongshan station to Dome A on East Antarctica ice sheet. are corrected to a certain real height relative to the snow surface with the impacts of snow accumulation, to improve the authenticity and representativeness of the observation data from AWS. The results showed that (1) the average accumulation at Dome A,Eagle and LGB69 is approximate1y 0.11 m, 0.30 m and 0.49 m snow per year, and the corresponding annual mean air temperature difference at 1 m height between corrected and measured is 0. 34℃ ,0.29℃ and 0.35℃, respectively. The values are less than 0.1℃ at 2 m and 4 m heights. (2) The impact on air temperature from accumulation is decreasing with the height from the surface. (3) The relationship between air temperature correction and accumulation is not a simple direct proportion. It also relates to the characteristics of air temperature seasonal variation an d the intensity of the local surface inversion. (4) The average air temperature correction is almost positive except in summer without inversion at times. The magnitude of it is mainly determined by accumulation and the intensity of surface inversion.

Item Details

Item Type:Refereed Article
Keywords:Antarctic ice sheet, surface temperature, temperature inversion, automatic weather station
Research Division:Earth Sciences
Research Group:Atmospheric sciences
Research Field:Meteorology
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Understanding climate change not elsewhere classified
UTAS Author:Allison, I (Dr Ian Allison)
ID Code:100648
Year Published:2008
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2015-05-22
Last Modified:2016-09-09

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