| DOI: | 10.1002/2014GL062170
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| 论文题名: | Fractal geometry of aggregate snowflakes revealed by triple-wavelength radar measurements |
| 作者: | Stein T.H.M.; Westbrook C.D.; Nicol J.C.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9067
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| EISSN: | 1944-8798
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| 出版年: | 2015
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| 卷: | 42, 期:1 | | 起始页码: | 176
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| 结束页码: | 183
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| 语种: | 英语
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| 英文关键词: | radar
; scattering
; snow
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| Scopus关键词: | Aggregates
; Fractal dimension
; Fractals
; Radar
; Scattering
; Snow
; Aggregation model
; FRactal aggregate
; Fractal geometry
; In-situ observations
; Large aggregates
; Physically based
; Radar reflectivities
; Triple wavelengths
; Radar measurement
; aggregate
; colloid
; radar imagery
; reflectivity
; snow cover
; stratiform cloud
; wavelength
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| 英文摘要: | Radar reflectivity measurements from three different wavelengths are used to retrieve information about the shape of aggregate snowflakes in deep stratiform ice clouds. Dual-wavelength ratios are calculated for different shape models and compared to observations at 3, 35, and 94 GHz. It is demonstrated that many scattering models, including spherical and spheroidal models, do not adequately describe the aggregate snowflakes that are observed. The observations are consistent with fractal aggregate geometries generated by a physically based aggregation model. It is demonstrated that the fractal dimension of large aggregates can be inferred directly from the radar data. Fractal dimensions close to 2 are retrieved, consistent with previous theoretical models and in situ observations. Key Points Triple-wavelength radar measurements can distinguish aggregate shape Aggregate snowflakes are found to be fractal The fractal dimension of aggregate snowflakes is approximately 2 ©2014. The Authors. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921890724&doi=10.1002%2f2014GL062170&partnerID=40&md5=af465b9481df09769a07202ab3e8dbde
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8683
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Department of Meteorology, University of Reading, Reading, United Kingdom
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| Recommended Citation: | |
Stein T.H.M.,Westbrook C.D.,Nicol J.C.. Fractal geometry of aggregate snowflakes revealed by triple-wavelength radar measurements[J]. Geophysical Research Letters,2015-01-01,42(1).
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