DOI: 10.1002/2014GL061016
论文题名: Observed influence of riming, temperature, and turbulence on the fallspeed of solid precipitation
作者: Garrett T.J. ; Yuter S.E.
刊名: Geophysical Research Letters
ISSN: 0094-9781
EISSN: 1944-9512
出版年: 2014
卷: 41, 期: 18 起始页码: 6515
结束页码: 6522
语种: 英语
英文关键词: fallspeed
; precipitation
; riming
; temperature
; turbulence
Scopus关键词: Clouds
; Geographical distribution
; Particle size
; Precipitation (chemical)
; Temperature
; Automated measurement
; fallspeed
; Particle densities
; Particle size and shape
; riming
; Solid precipitation
; Terminal velocity
; Turbulence conditions
; Turbulence
; air temperature
; atmospheric modeling
; forecasting method
; hydrometeorology
; instrumentation
; low temperature
; measurement method
; particle size
; photography
; precipitation (climatology)
; temperature effect
; turbulence
; velocity
; United States
; Utah
英文摘要: Forecasts of the amount and geographic distribution of snow are highly sensitive to a model's parameterization of hydrometeor fallspeed. Riming is generally thought to lead to particles with a higher mass and terminal velocity. Yet models commonly assume that heavily rimed particles such as graupel have a fixed density and that their settling speed is unaffected by turbulence in storms. Here we show automated measurements of photographed hydrometeor shape and fallspeed using a new instrument placed in Utah's Wasatch Mountain Range. The data show that graupel in low-turbulence conditions has a size-dependent fallspeed distribution with a mode near 1 m s-1, a result that is generally consistent with prior observations. However, the distributions are broadened by turbulence and there is a correspondence between particle density and air temperature. In high turbulence and at low temperatures, any sensitivity of fallspeed to particle size disappears. Key PointsA new database for the characterization of frozen precipitation is presentedRiming is associated with more compact particles that fall fasterFallspeed is determined by temperature, turbulence, and particle size and shape ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911127014&doi=10.1002%2f2014GL061016&partnerID=40&md5=ab2aa4a66890f0bcfe61eee59906317d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7045
Appears in Collections: 气候减缓与适应
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作者单位: Department of Atmospheric Sciences, University of Utah, Salt Lake City, UT, United States
Recommended Citation:
Garrett T.J.,Yuter S.E.. Observed influence of riming, temperature, and turbulence on the fallspeed of solid precipitation[J]. Geophysical Research Letters,2014-01-01,41(18).