DOI: 10.1002/2015MS000478
Scopus记录号: 2-s2.0-84959563110
论文题名: Evaluation of high-level clouds in cloud resolving model simulations with ARM and KWAJEX observations
作者: Liu Z ; , Muhlbauer A ; , Ackerman T
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 7, 期: 4 起始页码: 1716
结束页码: 1740
语种: 英语
英文关键词: Boundary conditions
; Ice
; Radar
; Radiation effects
; Uncertainty analysis
; Cloud resolving model
; High level clouds
; Large-scale forcing
; Lateral boundary conditions
; Microphysics
; Nudging
; Climate models
; boundary condition
; climate modeling
; cloud microphysics
; cloud radiative forcing
; convection
; convective cloud
; global climate
; radar
; reflectivity
; thermodynamics
英文摘要: In this study, we evaluate high-level clouds in a cloud resolving model during two convective cases, ARM9707 and KWAJEX. The simulated joint histograms of cloud occurrence and radar reflectivity compare well with cloud radar and satellite observations when using a two-moment microphysics scheme. However, simulations performed with a single moment microphysical scheme exhibit low biases of approximately 20 dB. During convective events, two-moment microphysical overestimate the amount of high-level cloud and one-moment microphysics precipitate too readily and underestimate the amount and height of high-level cloud. For ARM9707, persistent large positive biases in high-level cloud are found, which are not sensitive to changes in ice particle fall velocity and ice nuclei number concentration in the two-moment microphysics. These biases are caused by biases in large-scale forcing and maintained by the periodic lateral boundary conditions. The combined effects include significant biases in high-level cloud amount, radiation, and high sensitivity of cloud amount to nudging time scale in both convective cases. The high sensitivity of high-level cloud amount to the thermodynamic nudging time scale suggests that thermodynamic nudging can be a powerful "tuning" parameter for the simulated cloud and radiation but should be applied with caution. The role of the periodic lateral boundary conditions in reinforcing the biases in cloud and radiation suggests that reducing the uncertainty in the large-scale forcing in high levels is important for similar convective cases and has far reaching implications for simulating high-level clouds in super-parameterized global climate models such as the multiscale modeling framework. © 2015 The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75969
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: Polar Science Center, Applied Physics Laboratory, University of Washington, Seattle, WA, United States; Joint Institute for the Study of the Atmosphere and Ocean, University of Washington, Seattle, WA, United States; Now at FM Global Research, Center for Property Risk Solutions, Norwood, MA, United States
Recommended Citation:
Liu Z,, Muhlbauer A,, Ackerman T. Evaluation of high-level clouds in cloud resolving model simulations with ARM and KWAJEX observations[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(4)