DOI: 10.5194/tc-8-125-2014
Scopus记录号: 2-s2.0-84893094548
论文题名: Updated cloud physics in a regional atmospheric climate model improves the modelled surface energy balance of Antarctica
作者: Van Wessem J ; M ; , Reijmer C ; H ; , Lenaerts J ; T ; M ; , Van De Berg W ; J ; , Van Den Broeke M ; R ; , Van Meijgaard E
刊名: Cryosphere
ISSN: 19940416
出版年: 2014
卷: 8, 期: 1 起始页码: 125
结束页码: 135
语种: 英语
英文关键词: atmospheric modeling
; climate modeling
; energy balance
; heat flux
; longwave radiation
; moisture
; numerical model
; optical property
; parameterization
; surface temperature
; topography
; turbulence
; weather station
; Antarctica
; East Antarctica
英文摘要: In this study the effects of changes in the physics package of the regional atmospheric climate model RACMO2 on the modelled surface energy balance, near-surface temperature and wind speed of Antarctica are presented. The physics package update primarily consists of an improved turbulent and radiative flux scheme and a revised cloud scheme that includes a parameterisation for ice cloud super-saturation. The ice cloud super-saturation has led to more moisture being transported onto the continent, resulting in more and optically thicker clouds and more downward long-wave radiation. Overall, the updated model better represents the surface energy balance, based on a comparison with >750 months of data from nine automatic weather stations located in East Antarctica. Especially the representation of the turbulent sensible heat flux and net long-wave radiative flux has improved with a decrease in biases of up to 40%. As a result, modelled surface temperatures have increased and the bias, when compared to 10 m snow temperatures from 64 ice-core observations, has decreased from-2.3 K to-1.3 K. The weaker surface temperature inversion consequently improves the representation of the sensible heat flux, whereas wind speed biases remain unchanged. However, significant model biases remain, partly because RACMO2 at a resolution of 27 km is unable to resolve steep topography. © Author(s) 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74899
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: Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, Netherlands; Royal Netherlands Meteorological Institute, De Bilt, Netherlands
Recommended Citation:
Van Wessem J,M,, Reijmer C,et al. Updated cloud physics in a regional atmospheric climate model improves the modelled surface energy balance of Antarctica[J]. Cryosphere,2014-01-01,8(1)