| DOI: | 10.1002/2015GL065140
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| 论文题名: | Overlap statistics of shallow boundary layer clouds: Comparing ground-based observations with large-eddy simulations |
| 作者: | Corbetta G.; Orlandi E.; Heus T.; Neggers R.; Crewell S.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8557
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| EISSN: | 1944-8288
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| 出版年: | 2015
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| 卷: | 42, 期:19 | | 起始页码: | 8185
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| 结束页码: | 8191
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| 语种: | 英语
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| 英文关键词: | boundary layer clouds
; cloud overlap
; cloud parameterization
; Cloudnet
; confronting models with observations
; LES
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| Scopus关键词: | Boundary layers
; Clouds
; Computational fluid dynamics
; Boundary layer clouds
; Cloud overlap
; Cloudnet
; confronting models with observations
; LES
; Large eddy simulation
; boundary layer
; cloud cover
; comparative study
; cumulus
; data set
; eddy
; ground-based measurement
; numerical model
; parameterization
; pixel
; statistical analysis
; Germany
; Julich
; North Rhine-Westphalia
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| 英文摘要: | High-resolution ground-based measurements are used to assess the realism of fine-scale numerical simulations of shallow cumulus cloud fields. The overlap statistics of cumuli as produced by large-eddy simulations (LES) are confronted with Cloudnet data sets at the Jülich Observatory for Cloud Evolution. The Cloudnet pixel is small enough to detect cumuliform cloud overlap. Cloud fraction masks are derived for five different cases, using gridded time-height data sets at various temporal and vertical resolutions. The overlap ratio (R), i.e., the ratio between cloud fraction by volume and by area, is studied as a function of the vertical resolution. Good agreement is found between R derived from observations and simulations. An inverse linear function is found to best describe the observed overlap behavior, confirming previous LES results. Simulated and observed decorrelation lengths are smaller (∼300 m) than previously reported (>1 km). A similar diurnal variation in the overlap efficiency is found in observations and simulations. Key Points Inefficient cloud overlap at small scales is now supported by observations Inverse linear functions best describe cloud overlap LES and observations both indicate a diurnal cycle in the overlap parameter © 2015. The Authors. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946944567&doi=10.1002%2f2015GL065140&partnerID=40&md5=ae9520385e76741be0e56a7bf489411a
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8173
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Institute for Geophysics and Meteorology, University of Cologne, Cologne, Germany
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| Recommended Citation: | |
Corbetta G.,Orlandi E.,Heus T.,et al. Overlap statistics of shallow boundary layer clouds: Comparing ground-based observations with large-eddy simulations[J]. Geophysical Research Letters,2015-01-01,42(19).
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