globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2015JD023492
论文题名:
The dependence of cirrus gamma size distributions expressed as volumes in N0-λ-μ phase space and bulk cloud properties on environmental conditions: Results from the Small Ice Particles in Cirrus Experiment (SPARTICUS)
作者: Jackson R.C.; McFarquhar G.M.; Fridlind A.M.; Atlas R.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2015
卷: 120, 期:19
起始页码: 10351
结束页码: 10377
语种: 英语
英文关键词: cloud physics ; size distributions
Scopus关键词: algorithm ; cirrus ; cloud microphysics ; ellipse ; environmental conditions ; ice crystal ; ice mechanics ; precipitation (climatology) ; size distribution ; volume change
英文摘要: The variability of cirrus ice microphysical properties is investigated using observations obtained during the Small Particles in Cirrus (SPARTICUS) campaign. An existing approach that represents a size distribution (SD) as a single gamma function using an ellipsoid of equally realizable solutions in (N0, λ, μ) phase space is modified to automatically identify multiple modes in SDs and characterize each mode by such an ellipsoid. The modified approach is applied to ice crystals with maximum dimension D > 15 μm collected by the 2-D stereo and 2-D precipitation probes on the Stratton Park Engineering Company Learjet. The dependencies of N0, μ, and λ from each mode, total number concentration, bulk extinction, ice water content (IWC), and mass median maximum dimension Dmm as a function of temperature T and cirrus type are then analyzed. The changes in the observed codependencies between N0, μ, and λ, bulk extinction, IWC, and Dmm with environmental conditions indicate that particles were larger at higher T during SPARTICUS. At most two modes were observed in any SD during SPARTICUS, with the average boundary between them at 115 μm, similar to past studies not using probes with shatter mitigating tips and artifact removal algorithms. The bimodality of the SDs increased with T. This and the differences in N0, μ, and λ between the modes suggest that particles with smaller D nucleated more recently than particles with larger D, which grew via vapor deposition and aggregation. Because smaller crystals, whose concentrations are uncertain, make marginal contributions to higher order moments, the use of higher moments for evaluating model fields is suggested. ©2015. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63011
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: Department of Atmospheric Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, United States; Now at Department of Atmospheric Sciences, University of Wyoming, Laramie, WY, United States; NASA Goddard Institute for Space Studies, New York, NY, United States; Department of Geophysical Sciences, University of Chicago, Chicago, IL, United States; Now at Atmospheric Modeling and Analysis Division, National Exposure Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, NC, United States

Recommended Citation:
Jackson R.C.,McFarquhar G.M.,Fridlind A.M.,et al. The dependence of cirrus gamma size distributions expressed as volumes in N0-λ-μ phase space and bulk cloud properties on environmental conditions: Results from the Small Ice Particles in Cirrus Experiment (SPARTICUS)[J]. Journal of Geophysical Research: Atmospheres,2015-01-01,120(19)
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