| DOI: | 10.1002/2015GL064009
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| 论文题名: | Stereo photogrammetry reveals substantial drag on cloud thermals |
| 作者: | Romps D.M.; Öktem R.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8645
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| EISSN: | 1944-8376
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| 出版年: | 2015
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| 卷: | 42, 期:12 | | 起始页码: | 5051
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| 结束页码: | 5057
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| 语种: | 英语
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| 英文关键词: | cloud thermals
; drag
; stereo photogrammetry
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| Scopus关键词: | Cameras
; Drag
; Drag coefficient
; Large eddy simulation
; Stereo image processing
; Dimensional position
; Empirical data
; In-situ measurement
; Momentum equation
; Stereo cameras
; Stereophotogrammetry
; Theoretical calculations
; Wave drags
; Photogrammetry
; buoyancy forcing
; cloud cover
; drag coefficient
; eddy covariance
; empirical analysis
; in situ measurement
; momentum transfer
; photogrammetry
; stereo image
; temperature gradient
; three-dimensional modeling
; videography
; Florida [United States]
; United States
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| 英文摘要: | Stereo photogrammetry, which uses two synchronized cameras to measure three-dimensional positions, is applied here to ascertain whether drag plays a role in the ascent of cloud thermals. In particular, stereo cameras are used to measure the sizes and speeds of cloud thermals in Florida. Using the vertical momentum equation, it is found that a substantial amount of drag (a drag coefficient on the order of 1) is needed to match both the stereo-photogrammetric data and the known buoyancy of clouds from previous in situ measurements and large-eddy simulations. Empirical data on form drag and theoretical calculations of wave drag reveal that, for the observed Froude numbers of cloud thermals, a drag coefficient of about one is to be expected. © 2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84948716916&doi=10.1002%2f2015GL064009&partnerID=40&md5=ae20c74ce4b5573af1963b8f2bdea89b
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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/8261
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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 Earth and Planetary Science, University of California, Berkeley, CA, United States
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| Recommended Citation: | |
Romps D.M.,Öktem R.. Stereo photogrammetry reveals substantial drag on cloud thermals[J]. Geophysical Research Letters,2015-01-01,42(12).
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