DOI: 10.1029/2017JD028053
Scopus记录号: 2-s2.0-85052232716
论文题名: Multiple Factors Explaining the Deficiency of Cloud Profiling Radar on Detecting Oceanic Warm Clouds
作者: Liu D. ; Liu Q. ; Liu G. ; Wei J. ; Deng S. ; Fu Y.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 15 起始页码: 8135
结束页码: 8158
语种: 英语
英文关键词: cloud microphysics
; CPR-missed detection
; miss rate
; radar reflectivity
; single-layer warm clouds
英文摘要: The Cloud Profiling Radar (CPR) detecting efficiency on low-level clouds is affected by many situations, including surface clutter, spatial resolution, and radar sensitivity. These factors can uniquely or jointly result in missed detections of oceanic single-layer warm clouds. Fifty-seven percent of missed detections are attributed to a single factor, and the rest are attributed to two or more factors that are indistinguishable. For missed warm clouds above 1 km, 30% result from the nonovercast effect, while the CPR range resolution is the major cause for the overcast ones. In particular, 18.4% are attributed exclusively to specific cloud microphysics, which is characterized by droplet effective radius (DER) and cloud optical thickness (COT). Compared to COT, the CPR detection is more dependent on DER, with a critical value standing around 10 μm. It is only for larger DER that the effects from COT turn to arise. Given liquid water path, clouds with larger DER and smaller COT are more likely to generate sufficient reflectivity and be detected than their counterpart. For clouds with the same DER and COT, opposite detecting results are primarily determined by the different droplet size distributions that lead to a variable reflectivity across the CPR detecting limit. Over global oceans, total miss rate of cloud occurrences approaches 0.73, while the loss rate of cloud water mass is 0.42 due to the smaller liquid water path of CPR-missed clouds. The CPR-missed detections also lead to uncertainties in cloud radiative forcing estimations. A notable overestimation of shortwave cloud forcing at 160% is found at bottom and top of atmosphere. ©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/113274
Appears in Collections: 气候减缓与适应
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作者单位: School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China; Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, United States; Anhui Institute of Meteorological Science, Hefei, China
Recommended Citation:
Liu D.,Liu Q.,Liu G.,et al. Multiple Factors Explaining the Deficiency of Cloud Profiling Radar on Detecting Oceanic Warm Clouds[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(15)