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DOI | 10.1029/2017JD027840 |
Polar Liquid Cloud Base Detection Algorithms for High Spectral Resolution or Micropulse Lidar Data | |
Silber, Israel1; Verlinde, Johannes1; Eloranta, Edwin W.2; Flynn, Connor J.3; Flynn, Donna M.3 | |
2018-04-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2018 |
卷号 | 123期号:8页码:4310-4322 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
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 degrees 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 degrees. |
英文关键词 | polar clouds liquid cloud base height HSRL MPLNET MPL lidar |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000433071200029 |
WOS关键词 | PRECIPITABLE WATER-VAPOR ; MIXED-PHASE CLOUDS ; LOW-LEVEL LIQUID ; MICROPHYSICAL PROPERTIES ; MICROWAVE RADIOMETERS ; ARCTIC CLOUDS ; ICE CLOUDS ; PART II ; MELT ; BACKSCATTER |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/32013 |
专题 | 气候变化 |
作者单位 | 1.Penn State Univ, Dept Meteorol & Atmospher Sci, University Pk, PA 16802 USA; 2.Univ Wisconsin, Ctr Space Sci & Engn, 1225 W Dayton St, Madison, WI 53706 USA; 3.Pacific Northwest Natl Lab, Richland, WA 99352 USA |
推荐引用方式 GB/T 7714 | Silber, Israel,Verlinde, Johannes,Eloranta, Edwin W.,et al. Polar Liquid Cloud Base Detection Algorithms for High Spectral Resolution or Micropulse Lidar Data[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(8):4310-4322. |
APA | Silber, Israel,Verlinde, Johannes,Eloranta, Edwin W.,Flynn, Connor J.,&Flynn, Donna M..(2018).Polar Liquid Cloud Base Detection Algorithms for High Spectral Resolution or Micropulse Lidar Data.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(8),4310-4322. |
MLA | Silber, Israel,et al."Polar Liquid Cloud Base Detection Algorithms for High Spectral Resolution or Micropulse Lidar Data".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.8(2018):4310-4322. |
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