DOI: 10.1016/j.atmosres.2018.07.013
Scopus记录号: 2-s2.0-85050314765
论文题名: The impact of ground-based glaciogenic seeding on a shallow stratiform cloud over the Sierra Madre in Wyoming: A multi-sensor study of the 3 March 2012 case
作者: Pokharel B. ; Geerts B. ; Jing X.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 214 起始页码: 74
结束页码: 90
语种: 英语
英文关键词: airborne measurements
; Glaciogenic seeding
; orographic cloud and precipitation
; radar reflectivity profiles
Scopus关键词: Chemical analysis
; Drop formation
; Ice
; Particle size
; Radar measurement
; Radar systems
; Reflection
; Silver halides
; Snow
; Storms
; Airborne measurements
; Differential reflectivity
; Glaciogenic seeding
; Number concentration
; Orographic cloud
; Precipitation rates
; Radar reflectivities
; Wyoming cloud radars
; Cloud seeding
; airborne survey
; cloud seeding
; droplet
; ground-based measurement
; orographic effect
; particle size
; precipitation (climatology)
; snow
; stratiform cloud
; Rocky Mountains
; Sierra Madre [United States]
; United States
; Wyoming
英文摘要: A case study is presented of the impact of ground-based glaciogenic seeding on a shallow, lightly precipitating orographic storm with abundant supercooled cloud droplets, but few ice particles. The storm was observed on 3 March 2012 as part of the AgI (silver iodide) Seeding Cloud Impact Investigating (ASCII) experiment in Wyoming. The cloud base temperature was about −9 °C, and cloud tops were at about −16 °C. The high concentration of small droplets and low ice particle concentration lead to natural snow growth, mainly by vapor diffusion. The question addressed here is whether the injection of ice nucleating particles (AgI) enhanced snow growth and snowfall. The treated (seeded) period is compared with the preceding untreated (noseeded) period, and natural trends (observed in an adjacent control region) are removed. The main target site, located on a mountain pass at an elevation above cloud base, was impacted by AgI seeding, according to a trace chemistry analysis of freshly fallen snow. Data from three radar systems were used: the Wyoming Cloud Radar, two Ka-band profiling Micro-Rain Radars, and a X-band scanning Doppler-on-Wheels (DOW) radar. Composite data from these radar systems and from gauges in the target area indicate an increase in low-level reflectivity and precipitation rate during seeding. This finding generally agrees with other published ASCII case studies. The increase in reflectivity during seeding in the target area appears to be due mainly to an increase in particle size (aggregation), not number concentration, as suggested by DOW differential reflectivity and by disdrometer and Cloud Particle Imager measurements on the ground. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/108762
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Atmospheric Science, University of Wyoming, Laramie, WY 82071, United States; Utah Climate Center, Utah State University, Logan, Utah 84322, United States
Recommended Citation:
Pokharel B.,Geerts B.,Jing X.. The impact of ground-based glaciogenic seeding on a shallow stratiform cloud over the Sierra Madre in Wyoming: A multi-sensor study of the 3 March 2012 case[J]. Atmospheric Research,2018-01-01,214