DOI: 10.5194/tc-15-3595-2021
论文题名: Sensitivity of the surface energy budget to drifting snow as simulated by MAR in coastal Adelie Land, Antarctica
作者: Le Toumelin L. ; Amory C. ; Favier V. ; Kittel C. ; Hofer S. ; Fettweis X. ; Gallee H. ; Kayetha V.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期: 8 起始页码: 3595
结束页码: 3614
语种: 英语
英文摘要: In order to understand the evolution of the climate of Antarctica, dominant processes that control surface and low-atmosphere meteorology need to be accurately captured in climate models. We used the regional climate model MAR (v3.11) at 10gkm horizontal resolution, forced by ERA5 reanalysis over a 9-year period (2010-2018) to study the impact of drifting snow (designating here the wind-driven transport of snow particles below and above 2gm) on the near-surface atmosphere and surface in Adelie Land, East Antarctica. Two model runs were performed, one with and one without drifting snow, and compared to half-hourly in situ observations at D17, a coastal and windy location of Adelie Land. We show that sublimation of drifting-snow particles in the atmosphere drives the difference between model runs and is responsible for significant impacts on the near-surface atmosphere. By cooling the low atmosphere and increasing its relative humidity, drifting snow also reduces sensible and latent heat exchanges at the surface (-5.7gWgm-2 on average). Moreover, large and dense drifting-snow layers act as near-surface cloud by interacting with incoming radiative fluxes, enhancing incoming longwave radiation and reducing incoming shortwave radiation in summer (net radiative forcing: 5.7gWgm-2). Even if drifting snow modifies these processes involved in surface-atmosphere interactions, the total surface energy budget is only slightly modified by introducing drifting snow because of compensating effects in surface energy fluxes. The drifting-snow driven effects are not prominent near the surface but peak higher in the boundary layer (fourth vertical level, 12gm) where drifting-snow sublimation is the most pronounced. Accounting for drifting snow in MAR generally improves the comparison at D17, especially for the representation of relative humidity (mean bias reduced from -14.0g% to -0.7g%) and incoming longwave radiation (mean bias reduced from -20.4gWgm-2 to -14.9gWgm-2). Consequently, our results suggest that a detailed representation of drifting-snow processes is required in climate models to better capture the near-surface meteorology and surface-atmosphere interactions in coastal Adelie Land. © 2021 Copernicus GmbH. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164736
Appears in Collections: 气候变化与战略
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作者单位: Universite Grenoble Alpes, CNRS, Institut des Geosciences de l'Environnement, Grenoble, 38000, France; Univ. Grenoble Alpes, Universite de Toulouse, Meteo-France, CNRS, CNRM, Centre d'Etudes de la Neige, Grenoble, France; F.R.S.-FNRS Laboratory of Climatology, Department of Geography, University of Liege, Liege, 4000, Belgium; Department of Geosciences, University of Oslo, Oslo, Norway; Science Systems and Applications, Greenbelt, MD, United States
Recommended Citation:
Le Toumelin L.,Amory C.,Favier V.,et al. Sensitivity of the surface energy budget to drifting snow as simulated by MAR in coastal Adelie Land, Antarctica[J]. Cryosphere,2021-01-01,15(8)