DOI: 10.1002/2017MS001184
Scopus记录号: 2-s2.0-85040689687
论文题名: Modeling the Dynamics of the Atmospheric Boundary Layer Over the Antarctic Plateau With a General Circulation Model
作者: Vignon E ; , Hourdin F ; , Genthon C ; , Van de Wiel B ; J ; H ; , Gallée H ; , Madeleine J ; -B ; , Beaumet J
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2018
卷: 10, 期: 1 起始页码: 98
结束页码: 125
语种: 英语
英文关键词: Boundary layers
; Climate models
; Domes
; Supersaturation
; Wind
; Antarctic plateau
; General circulation model
; In-situ observations
; LMDZ
; Long-wave radiation
; Stable boundary layer
; Surface temperatures
; Temperature inversions
; Atmospheric boundary layer
; atmospheric modeling
; boundary layer
; general circulation model
; longwave radiation
; simulation
; turbulent mixing
; wind velocity
; Antarctic Plateau
; Antarctica
; Dome Concordia
; East Antarctica
英文摘要: Observations evidence extremely stable boundary layers (SBL) over the Antarctic Plateau and sharp regime transitions between weakly and very stable conditions. Representing such features is a challenge for climate models. This study assesses the modeling of the dynamics of the boundary layer over the Antarctic Plateau in the LMDZ general circulation model. It uses 1 year simulations with a stretched-grid over Dome C. The model is nudged with reanalyses outside of the Dome C region such as simulations can be directly compared to in situ observations. We underline the critical role of the downward longwave radiation for modeling the surface temperature. LMDZ reasonably represents the near-surface seasonal profiles of wind and temperature but strong temperature inversions are degraded by enhanced turbulent mixing formulations. Unlike ERA-Interim reanalyses, LMDZ reproduces two SBL regimes and the regime transition, with a sudden increase in the near-surface inversion with decreasing wind speed. The sharpness of the transition depends on the stability function used for calculating the surface drag coefficient. Moreover, using a refined vertical grid leads to a better reversed “S-shaped” relationship between the inversion and the wind. Sudden warming events associated to synoptic advections of warm and moist air are also well reproduced. Near-surface supersaturation with respect to ice is not allowed in LMDZ but the impact on the SBL structure is moderate. Finally, climate simulations with the free model show that the recommended configuration leads to stronger inversions and winds over the ice-sheet. However, the near-surface wind remains underestimated over the slopes of East-Antarctica. © 2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75677
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: Univ. Grenoble Alpes, CNRS, IRD, IGE, Grenoble, France; CNRS, UMR 8539, Laboratoire de Météorologie Dynamique (IPSL), Paris, France; Faculty of Civil Engineering and Geosciences, Geoscience and Remote Sensing, Delft University of Technology, Delft, Netherlands; Sorbonne Universités, UPMC Univ Paris 06, UMR 8539, Laboratoire de Météorologie Dynamique (IPSL), Paris, France
Recommended Citation:
Vignon E,, Hourdin F,, Genthon C,et al. Modeling the Dynamics of the Atmospheric Boundary Layer Over the Antarctic Plateau With a General Circulation Model[J]. Journal of Advances in Modeling Earth Systems,2018-01-01,10(1)