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Colorado Airborne Multi-phase Cloud Study (CAMPS)

Colorado Airborne Multi-phase Cloud Study (CAMPS). Colorado Airborne Multi-phase Cloud Study (CAMPS). December 15, 2010 to February 28, 2011 29 research flights totaling 98 flight hours Over 10,500 km (30 hrs) in clouds Flights sampled a variety of conditions: Thick precipitating clouds

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Colorado Airborne Multi-phase Cloud Study (CAMPS)

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  1. Colorado Airborne Multi-phase Cloud Study (CAMPS)

  2. Colorado Airborne Multi-phase Cloud Study (CAMPS) • December 15, 2010 to February 28, 2011 • 29 research flights totaling 98 flight hours • Over 10,500 km (30 hrs) in clouds • Flights sampled a variety of conditions: • Thick precipitating clouds • Mixed-phase clouds with range of ice/liquid fractions • Pure ice and pure liquid clouds • Wave clouds • Cumulus/convective clouds

  3. University of Wyoming King Air

  4. King Air Instrumentation • Remote: Wyoming Cloud Radar (up/down); Wyoming Cloud Lidar (mostly down) • Particles: FSSP, 2D-P, 2D-C, CIP, CDP • Water Content: PVM-100, CLH, LWC-100 (hotwire), Rosemount Icing • Other: Chilled mirror hygrometer, LiCor H2O and CO2, state parameters

  5. Data Availability • All data are available through the Wyoming archive (password protected) • In situ data and aircraft parameters in single netCDF file for each flight • Information from 2D probes and CIP in separate files • Radar, lidar images are online; raw data available from investigators • CAMPS site: http://flights.uwyo.edu/projects/camps11/

  6. Data Quality and Issues Some additional information on CAMPS website

  7. Icing of Probes

  8. Flight patterns • Typically a set of three to five 30 nm legs along a fixed heading • Altitudes variable to maximize cloud encounters • Tried to pass over SPL when possible

  9. Flights of Interest Note: Flights 4, 7, 8, 24, 25 took place over Wyoming due to ATC restrictions (8, 15 and 17 Jan; 19 and 20 Feb)

  10. Research Topics • Zhien Wang (UWyo) • Comparison of measurements from particle probes on aircraft • Comparison of lidar and radar data with in situ water content and particle size distributions

  11. Research Topics • Sam Dorsi (Avallone student) • Can we determine phase of cloud water from in situ aircraft observations? • Can cloud phase be predicted by environmental conditions? • How abundant are mixed phase clouds?

  12. Cloud types and vertical wind speed

  13. Cloud scales • Frequency of cloud phase by length • - Glaciated: 86.7% (3764 segments) • - Mixed-phase: 13.2% (1476 segments) • Liquid-only: 0.1% (88 segments) • Power law relationship • - Glaciated: a1 = -1.3 ± 0.2 • - Mixed-phase: a1 = -1.3 ± 0.4

  14. Wave clouds

  15. Case Study Examples • January 17 (RF 8) – CloudSat overpass • Mixed-phase clouds from 21,000 to 16,000 ft • February 1 (RF 15) Cold and Ice formation • Flight through very thin clouds at 18,000 ft and -38 C. Possibly homogeneous nucleation • February 7 (RF 19) High LWC • Above Storm Peak Laboratory two distinct cloud decks, upper layer cloud ~20,000 composed entirely of ice and lower cloud deck that appeared more wavelike in structure. Over the course of flight, upper deck dissipated and lower deck thickened; Lower deck, mostly liquid with a few large ice particles; we encountered high CLWC's up to 1.0 g/m3

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