DOI: 10.1029/2017JD027840
Scopus记录号: 2-s2.0-85046149130
论文题名: Polar Liquid Cloud Base Detection Algorithms for High Spectral Resolution or Micropulse Lidar Data
作者: Silber I. ; Verlinde J. ; Eloranta E.W. ; Flynn C.J. ; Flynn D.M.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 8 起始页码: 4310
结束页码: 4322
语种: 英语
英文关键词: HSRL
; lidar
; liquid cloud base height
; MPL
; MPLNET
; polar clouds
Scopus关键词: algorithm
; cloud
; cloud microphysics
; comparative study
; detection method
; energy budget
; ground-based measurement
; height
; lidar
; liquid
; measurement method
; radiometer
; spectral resolution
; zenith angle
; Alaska
; Antarctica
; Barrow
; East Antarctica
; Madison
; McMurdo Station
; United States
; Wisconsin
英文摘要: Liquid layers in clouds affect their microphysical processes, as well as the surface energy budget. Studies focusing on these and other areas of research are often in need of skillful estimation of liquid-bearing cloud layer boundaries. The bases of these layers are predominantly determined by ground-based lidar instruments. Most studies requiring liquid cloud base height (LCBH) information use either fixed lidar parameter (depolarization and/or backscatter cross section) thresholds or cloud base height data products that do not distinguish between ice and liquid, all of which might introduce inconsistencies and errors in the resolved LCBH. In this paper, two explicit LCBH detection algorithms are presented. The first algorithm uses the high spectral resolution lidar (HSRL) data. Examination of this algorithm in multiple cases and scenarios during numerous days and first-order comparison with microwave-radiometer data show satisfactory results. The second algorithm incorporates widely available micropulse lidar (MPL) data for the LCBH detection. A 1-year long comparison of data gathered at Barrow, Alaska, and McMurdo Station, Antarctica, which includes other cloud base detection methodologies (ceilometer, MPL value-added product cloud base height, and LCBHs detected using a fixed MPL depolarization threshold), emphasizes the merits of the presented MPL algorithm. Examination of several unusual LCBH configurations suggests that the current practice of operating lidar at a tilting angle of 4° off zenith may not be sufficient to avoid specular reflection from oriented ice crystals. Data collected at Madison Wisconsin are used to show that specular reflection may impact measurements even at 4°. ©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/114073
Appears in Collections: 气候减缓与适应
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作者单位: Department of Meteorology and Atmospheric Science, Pennsylvania State University, University Park, PA, United States; Space Science and Engineering Center, University of Wisconsin, Madison, WI, United States; Pacific Northwest National Laboratory, Richland, WA, United States
Recommended Citation:
Silber I.,Verlinde J.,Eloranta E.W.,et al. Polar Liquid Cloud Base Detection Algorithms for High Spectral Resolution or Micropulse Lidar Data[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(8)