Journal
ATMOSPHERIC RESEARCH
Volume 182, Issue -, Pages 269-281Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.atmosres.2016.08.008
Keywords
Glaciogenic seeding; Orographic cloud and precipitation; Radar reflectivity; Airborne measurements
Categories
Funding
- National Science Foundation [AGS-1058426]
- Wyoming Water Development Commission [1001552C]
- United States Geological Survey, of the University of Wyoming Water Research Program [10000628S]
- WWMPP
- State of Wyoming
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The AgI Seeding Cloud Impact Investigation (ASCII) campaign was conducted in early 2012 and 2013 over two mountain ranges in southern Wyoming to examine the impact of ground-based glaciogenic seeding on snow growth in winter orographic clouds. The campaign was supported by a network of ground-based instruments, including microwave radiometers, two profiling Ka-band Micro-Rain Radars (MRRs), a Doppler on Wheels (DOW) X-band radar, and a Parsivel disdrometer. The University of Wyoming King Air operated the profiling Wyoming Cloud Radar, the Wyoming Cloud Lidar, and in situ cloud and precipitation particle probes. The characteristics of the orographic clouds, flow field, and upstream stability profiles in 27 intensive observation periods (IOPs) are described here. A composite analysis of the impact of seeding on snow growth is presented in Part II of this study (Pokharel et al., 2017). Clouds were stratiform in most IOPs, but in 10 IOPs convective clouds were present. Most clouds were shallow (similar to 2 km deep), all had some liquid water but generally with a liquid water path <03 mm, and all were naturally precipitating but generally at a rate <1 mm h(-1). (C) 2016 Elsevier B.V. All rights reserved.
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