DOI: 10.1002/2013MS000277
Scopus记录号: 2-s2.0-84904874615
论文题名: Evaluation of boundary layer cloud parameterizations in the ECHAM5 general circulation model using CALIPSO and CloudSat satellite data
作者: Nam C ; C ; W ; , Quaas J ; , Neggers R ; , Siegenthaler-Le Drian C ; , Isotta F
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2014
卷: 6, 期: 2 起始页码: 300
结束页码: 314
语种: 英语
英文关键词: Clouds
; Graphic methods
; Optical radar
; Parameterization
; Rain
; Reflection
; CALIPSO
; CloudSat
; COSP
; General circulation model
; Large-scale precipitation
; Low-level cloud covers
; Oceanic boundary layers
; Shallow cumulus clouds
; Boundary layers
英文摘要: Three different boundary layer cloud models are incorporated into the ECHAM5 general circulation model (GCM) and compared to CloudSat and CALIPSO satellite observations. The first boundary layer model builds upon the standard Tiedtke (1989) parameterization for shallow convection with an adapted convective trigger; the second is a bulk parameterization of the effects of transient shallow cumulus clouds; and lastly the Dual Mass Flux (DMF) scheme adjusted to better represent shallow convection. The three schemes improved (Sub)Tropical oceanic low-level cloud cover, however, the fraction of low-level cloud cover remains underestimated compared to CALIPSO observations. The representation of precipitation was improved by all schemes as they reduced the frequency of light intensity events <0.01 mm d-1, which were found to dominate the radar reflectivity histograms as well as be the greatest source of differences between ECHAM5 and CloudSat radar reflectivity histograms. For both lidar and radar diagnostics, the differences amongst the schemes are smaller than the differences compared to observations. While the DMF approach remains experimental, as its top-of-atmosphere radiative balance has not been retuned, it shows the most promise in producing nonprecipitating boundary layer clouds. With its internally consistent boundary layer scheme that uses the same bimodal joint distribution with a diffusive and an updraft component for clouds and turbulent transport, the ECHAM5-DMF produces the most realistic boundary layer depth as indicated by the cloud field. In addition, it reduced the frequency of large-scale precipitation intensities of <0.01 mm d-1 the greatest. Key Points All three schemes improved the (sub)tropical oceanic boundary layer clouds Differences amongst schemes less than differences to satellite observations Advective component of Dual Mass Flux improves representation of shallow cumulus © 2014. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/76111
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: Max Planck Institute for Meteorology, Hamburg, Germany; Leipzig Institute for Meteorology, Universität Leipzig, Leipzig, Germany; Faculty of Mathematics and Natural Sciences, University of Cologne, Cologne, Germany; Swiss Federal Institute of Technology (ETHZ), Zurich, Switzerland; MeteoSwiss, Zurich, Switzerland
Recommended Citation:
Nam C,C,W,et al. Evaluation of boundary layer cloud parameterizations in the ECHAM5 general circulation model using CALIPSO and CloudSat satellite data[J]. Journal of Advances in Modeling Earth Systems,2014-01-01,6(2)