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

journal contribution
posted on 2023-05-18, 10:17 authored by Ma, Y, Bian, L, Xiao, C, Ian AllisonIan Allison
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.

History

Publication title

Chinese Journal of Polar Research

Volume

20

Issue

4

Pagination

299-309

ISSN

1007-7065

Department/School

Institute for Marine and Antarctic Studies

Place of publication

China

Rights statement

Copyright Advances in Polar Science

Repository Status

  • Restricted

Socio-economic Objectives

Understanding climate change not elsewhere classified

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