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DOI | 10.1029/2019JD031188 |
The Vertical Structure of Liquid Water Content in Shallow Clouds as Retrieved From Dual-Wavelength Radar Observations | |
Zhu, Zeen1; Lamer, Katia2; Kollias, Pavlos1; Clothiaux, Eugene E.3 | |
2019-12-26 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2019 |
卷号 | 124期号:24页码:14184-14197 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Observations collected over 3 months by the beam-matched second-generation Ka/W band Scanning Cloud Radar located at the Atmospheric Radiation Measurement Program Eastern North Atlantic observatory are used to advance existing liquid water content (LWC) retrieval techniques, quantify retrieval uncertainty, and subsequently characterize the impact of cloud dynamics and rain rates on the vertical distribution of LWC in boundary layer clouds both precipitating and broken. A threefold technique is proposed that involves (1) temporally averaging measured radar reflectivities collected at two wavelengths to 30-s resolution, (2) smoothing via fitting a second-degree polynomial to their dual-wavelength ratios within 187.5-m vertical overlapping sliding windows, and (3) averaging the multiple LWC estimates produced at each height. It is estimated that this technique reduced LWC retrieval uncertainty to 0.10-0.65 g/m(3), depending on cloud thickness. Although individual retrievals remained noisy, statistics on subgroups of height-normalized LWC profiles show that, on average, the vertical distributions of LWC in most of the observed clouds followed a linear relationship with a degree of adiabaticity ranging from 0.6 to 0.2 for 200- to 600-m thick clouds. However, nonlinear LWC profiles were present in subgroups of cloud segments presenting intense (0.1-0.5 mm/hr) drizzle rates where LWC was observed to pool near cloud base and in subgroups of cloud segments within strong (0.6 m/s) downdrafts near cloud top where LWC was coincidently reduced. This nonlinearity is inconsistent with the use of adiabatic cloud assumptions for process studies and supports further development of retrievals like the one proposed. |
英文关键词 | boundary layer cloud observation dual-wavelength ratio technique liquid water content retrieval liquid water content vertical distribution cloud adiabaticity dynamic and microphysical process |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000504434700001 |
WOS关键词 | PROFILES ; RADIOMETER ; TURBULENCE ; LEVEL ; VAPOR |
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/225977 |
专题 | 环境与发展全球科技态势 |
作者单位 | 1.SUNY Stony Brook, Sch Marine & Atmospher Sci, Stony Brook, NY 11794 USA; 2.CUNY City Coll, Dept Earth & Atmospher Sci, New York, NY 10031 USA; 3.Penn State Univ, Dept Meteorol & Atmospher Sci, University Pk, PA 16802 USA |
推荐引用方式 GB/T 7714 | Zhu, Zeen,Lamer, Katia,Kollias, Pavlos,et al. The Vertical Structure of Liquid Water Content in Shallow Clouds as Retrieved From Dual-Wavelength Radar Observations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019,124(24):14184-14197. |
APA | Zhu, Zeen,Lamer, Katia,Kollias, Pavlos,&Clothiaux, Eugene E..(2019).The Vertical Structure of Liquid Water Content in Shallow Clouds as Retrieved From Dual-Wavelength Radar Observations.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(24),14184-14197. |
MLA | Zhu, Zeen,et al."The Vertical Structure of Liquid Water Content in Shallow Clouds as Retrieved From Dual-Wavelength Radar Observations".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.24(2019):14184-14197. |
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