globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2015JD024537
论文题名:
Insights into riming and aggregation processes as revealed by aircraft, radar, and disdrometer observations for a 27 April 2011 widespread precipitation event
作者: Giangrande S.E.; Toto T.; Bansemer A.; Kumjian M.R.; Mishra S.; Ryzhkov A.V.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2016
语种: 英语
英文关键词: Aggregation ; Aircraft ; Disdrometer ; Precipitation ; Radar ; Riming
英文摘要: This study presents aircraft spiral ascent and descent observations intercepting a transition to riming processes during widespread stratiform precipitation. The sequence is documented using collocated scanning and profiling radar, including longer-wavelength dual polarization measurements and shorter-wavelength Doppler spectra. Riming regions are supported using aircraft measurements recording elevated liquid water concentrations, spherical particle shapes, and saturation with respect to water. Profiling cloud radar observations indicate riming regions during the event as having increasing particle fall speeds, rapid time-height changes, and bimodalities in Doppler spectra. These particular riming signatures are coupled to scanning dual polarization radar observations of higher differential reflectivity (ZDR) aloft. Reduced melting layer enhancements and delayed radar bright-band signatures in the column are also observed during riming periods, most notably with the profiling radar observations. The bimodal cloud radar Doppler spectra captured near riming zones indicate two time-height spectral ice peaks, one rimed particle peak, and one peak associated with pristine ice needle generation and/or growth between -4°C and -7°C also sampled by aircraft probes. This pristine needle population gives a partial explanation for the enhanced ZDR we observe near this rimed particle region. The riming signatures aloft and radar measurements within the melting level are weakly lag correlated (r~0.6) with smaller median drop sizes at the surface, as compared with later times when aggregation of larger particle sizes was believed dominant. © 2016. 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/62949
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: Atmospheric Sciences Division Brookhaven National Laboratory Upton, New York USA; National Center for Atmospheric Research Boulder, Colorado USA; Department of Meteorology Pennsylvania State University University Park, Pennsylvania USA; Cooperative Institute for Mesoscale Meteorological Studies University of Oklahoma and NOAA/National Severe Storms Laboratory Norman, Oklahoma USA

Recommended Citation:
Giangrande S.E.,Toto T.,Bansemer A.,et al. Insights into riming and aggregation processes as revealed by aircraft, radar, and disdrometer observations for a 27 April 2011 widespread precipitation event[J]. Journal of Geophysical Research: Atmospheres,2016-01-01
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