DOI: 10.1002/2017JD027724
Scopus记录号: 2-s2.0-85043359525
论文题名: Midlatitude Cirrus Clouds at the SACOL Site: Macrophysical Properties and Large-Scale Atmospheric States
作者: Ge J. ; Zheng C. ; Xie H. ; Xin Y. ; Huang J. ; Fu Q.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 4 起始页码: 2256
结束页码: 2271
语种: 英语
英文关键词: cirrus cloud
; cloud radar
; cluster analysis
; SACOL
Scopus关键词: cirrus
; climate modeling
; cloud microphysics
; cluster analysis
; global climate
; radar
; seasonal variation
; synoptic meteorology
; velocity profile
; vertical profile
英文摘要: Two-year observations of a Ka-band Zenith Radar at the Semi-Arid Climate and Environment Observatory of Lanzhou University (SACOL) are used to document the midlatitude cirrus cloud macroproperties. Generally, cirrus occurs 41.6% of the observation time and most frequently appear at about 7.2 km above ground level. The cirrus macroproperties are strongly coupled with large-scale atmospheric states; thus, its occurrence and location over the SACOL have significant seasonal variations. A k-mean clustering method is used to classify cirrus into four distinct regimes without a prior knowledge about the meteorological process. Contrasting to the different cirrus physical properties in each regime, the cirrus event of each regime has a distinct seasonal distribution and the synoptic conditions from the ERA-Interim reanalysis responsible for each cirrus regime are also quite different. Since global climate models typically overestimate cirrus cloud thickness due to inadequate parameterization or coarse grid resolution, we examined the probability density functions of large-scale vertical velocity associated with each cirrus regime and the relationship between cirrus thickness and vertical velocity. It is found that the differences of the vertical velocity probability density functions among the cirrus regimes are as distinct as their macroproperties and a significant correlation exists between cirrus thickness and the vertical velocity, although the large-scale vertical motion is nearly as likely to be descending as ascending when cirrus clouds are observed. This may imply that large-scale vertical velocity can be used to constrain the variations of cirrus thickness simulated by global climate models. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114434
Appears in Collections: 气候减缓与适应
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作者单位: Key Laboratory for Semi-Arid Climate Change of the Ministry of Education and College of Atmospheric Sciences, Lanzhou University, Lanzhou, China; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States
Recommended Citation:
Ge J.,Zheng C.,Xie H.,et al. Midlatitude Cirrus Clouds at the SACOL Site: Macrophysical Properties and Large-Scale Atmospheric States[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(4)