DOI: 10.5194/tc-11-2755-2017
Scopus记录号: 2-s2.0-85037680936
论文题名: Blowing snow detection from ground-based ceilometers: Application to East Antarctica
作者: Gossart A ; , Souverijns N ; , Gorodetskaya I ; V ; , Lhermitte S ; , Lenaerts J ; T ; M ; , Schween J ; H ; , Mangold A ; , Laffineur Q ; , Van Lipzig N ; P ; M
刊名: Cryosphere
ISSN: 19940416
出版年: 2017
卷: 11, 期: 6 起始页码: 2755
结束页码: 2772
语种: 英语
英文关键词: blowing snow
; detection method
; equipment
; ground-based measurement
; ice sheet
; mass balance
; numerical method
; parameterization
; precipitation (climatology)
; remote sensing
; wind velocity
; Antarctica
; East Antarctica
英文摘要: Blowing snow impacts Antarctic ice sheet surface mass balance by snow redistribution and sublimation. However, numerical models poorly represent blowing snow processes, while direct observations are limited in space and time. Satellite retrieval of blowing snow is hindered by clouds and only the strongest events are considered. Here, we develop a blowing snow detection (BSD) algorithm for ground-based remote-sensing ceilometers in polar regions and apply it to ceilometers at Neumayer III and Princess Elisabeth (PE) stations, East Antarctica. The algorithm is able to detect (heavy) blowing snow layers reaching 30ĝ€m height. Results show that 78ĝ€% of the detected events are in agreement with visual observations at Neumayer III station. The BSD algorithm detects heavy blowing snow 36ĝ€% of the time at Neumayer (2011-2015) and 13ĝ€% at PE station (2010-2016). Blowing snow occurrence peaks during the austral winter and shows around 5ĝ€% interannual variability. The BSD algorithm is capable of detecting blowing snow both lifted from the ground and occurring during precipitation, which is an added value since results indicate that 92ĝ€% of the blowing snow is during synoptic events, often combined with precipitation. Analysis of atmospheric meteorological variables shows that blowing snow occurrence strongly depends on fresh snow availability in addition to wind speed. This finding challenges the commonly used parametrizations, where the threshold for snow particles to be lifted is a function of wind speed only. Blowing snow occurs predominantly during storms and overcast conditions, shortly after precipitation events, and can reach up to 1300ĝ€mĝ€†a. g. l. in the case of heavy mixed events (precipitation and blowing snow together). These results suggest that synoptic conditions play an important role in generating blowing snow events and that fresh snow availability should be considered in determining the blowing snow onset. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75470
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 Earth and Environmental Sciences, KU Leuven, Leuven, Belgium; Center for Environmental and Marine Sciences, Department of Physics, University of Aveiro, Aveiro, Portugal; Department of Geosciences and Remote Sensing, Delft University of Technology, Delft, Netherlands; Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, Netherlands; Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO, United States; Institute of Geophysics and Meteorology, Cologne University, Cologne, Germany; Royal Meteorological Institute of Belgium, Brussels, Belgium
Recommended Citation:
Gossart A,, Souverijns N,, Gorodetskaya I,et al. Blowing snow detection from ground-based ceilometers: Application to East Antarctica[J]. Cryosphere,2017-01-01,11(6)