DOI: 10.1007/s00382-015-2599-9
Scopus记录号: 2-s2.0-84955657930
论文题名: Causes of WRF surface energy fluxes biases in a stratocumulus region
作者: Jousse A. ; Hall A. ; Sun F. ; Teixeira J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 46, 期: 2017-01-02 起始页码: 571
结束页码: 584
语种: 英语
英文关键词: Physics parameterization schemes
; Stratocumulus
; Surface energy fluxes
; VOCALS-REx
; Weather Research and Forecasting (WRF) model
英文摘要: In this study, we evaluate the ability of the Weather Research and Forecasting model to simulate surface energy fluxes in the southeast Pacific stratocumulus region. A total of 18 simulations is performed for the period of October to November 2008, with various combinations of boundary layer, microphysics, and cumulus schemes. Simulated surface energy fluxes are compared to those measured during VOCALS-REx. Using a process-based model evaluation, errors in surface fluxes are attributed to errors in cloud properties. Net surface flux errors are mostly traceable to errors in cloud liquid water path (LWPcld), which produce biases in downward shortwave radiation. Two mechanisms controlling LWPcld are diagnosed. One involves microphysics schemes, which control LWPcld through the production of raindrops. The second mechanism involves boundary layer and cumulus schemes, which control moisture available for cloud by regulating boundary layer height. In this study, we demonstrate that when parameterizations are appropriately chosen, the stratocumulus deck and the related surface energy fluxes are reasonably well represented. In the most realistic experiments, the net surface flux is underestimated by about 10 W m−2. This remaining low bias is due to a systematic overestimation of the total surface cooling due to sensible and latent heat fluxes in our simulations. There does not appear to be a single physical reason for this bias. Finally, our results also suggest that inaccurate representation of boundary layer height is an important factor limiting further gains in model realism. © 2015, Springer-Verlag Berlin Heidelberg. 资助项目: DOE, National Aeronautics and Space Administration
; NASA, National Aeronautics and Space Administration
; NCAR, National Aeronautics and Space Administration
; NSF, National Aeronautics and Space Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53874
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, CA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
Recommended Citation:
Jousse A.,Hall A.,Sun F.,et al. Causes of WRF surface energy fluxes biases in a stratocumulus region[J]. Climate Dynamics,2016-01-01,46(2017-01-02)