DOI: 10.1175/JCLI-D-12-00020.1
Scopus记录号: 2-s2.0-84872918638
论文题名: Evaluation of near-surface parameters in the two versions of the atmospheric model in CESM1 using flux station observations
作者: Lindvall J. ; Svensson G. ; Hannay C.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 1 起始页码: 26
结束页码: 44
语种: 英语
Scopus关键词: Atmospheric components
; Atmospheric model
; Cold winter
; Community atmosphere model
; Data sets
; Diurnal cycle
; Earth system model
; Flux towers
; High frequency measurements
; High Latitudes
; Low-level winds
; Near-surface
; Near-surface winds
; Net radiation
; Nonlocal
; Reanalysis
; Seasonal temperature
; Subgrid scale
; Summer temperature
; Surface stress
; Turbulent heat fluxes
; Turbulent kinetic energy
; Wind speed
; Boundary layers
; Cams
; Kinetics
; Parameterization
; Wind effects
; Atmospheric thermodynamics
; air temperature
; amplitude
; atmospheric modeling
; boundary layer
; computer simulation
; diurnal activity
; heat flux
; parameterization
; wind
; wind velocity
英文摘要: This paper describes the performance of the Community Atmosphere Model (CAM) versions 4 and 5 in simulating near-surface parameters. CAM is the atmospheric component of the Community Earth System Model (CESM). Most of the parameterizations in the two versions are substantially different, and that is also true for the boundary layer scheme: CAM4 employs a nonlocal K-profile scheme, whereas CAM5 uses a turbulent kinetic energy (TKE) scheme. The evaluation focuses on the diurnal cycle and global observational and reanalysis datasets are used together with multiyear observations from 35 flux tower sites, providing highfrequency measurements in a range of different climate zones. It is found that both model versions capture the timing of the diurnal cycle but considerably overestimate the diurnal amplitude of net radiation, temperature, wind, and turbulent heat fluxes. The seasonal temperature range at mid- and high latitudes is also overestimated with too warm summer temperatures and too cold winter temperatures. The diagnosed boundary layer is deeper in CAM5 over ocean in regions with low-level marine clouds as a result of the turbulence generated by cloud-top cooling. Elsewhere, the boundary layer is in general shallower in CAM5. The two model versions differ substantially in their representation of near-surface wind speeds over land. The lowlevel wind speed in CAM5 is about half as strong as in CAM4, and the difference is even larger in areas where the subgrid-scale terrain is significant. The reason is the turbulent mountain stress parameterization, only applied in CAM5, which acts to increase the surface stress and thereby reduce the wind speed. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52075
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Meteorology, Bert Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; National Center for Atmospheric Research, Boulder, CO, United States
Recommended Citation:
Lindvall J.,Svensson G.,Hannay C.. Evaluation of near-surface parameters in the two versions of the atmospheric model in CESM1 using flux station observations[J]. Journal of Climate,2013-01-01,26(1)