Commercial Aircraft Inadvertent Cloud Seeding - Hole Punch and Canal Clouds
Channel: ClimateViewer
Date: 03/11/2012

91st American Meteorological Society Annual Meeting
Thursday, 27 January 2011: 8:30 AM
https://ams.confex.com/ams/91Annual/webprogram/18WXMOD.html

Joint Session 1: Modification of Marine and Supercooled Stratocumulus
https://ams.confex.com/ams/91Annual/webprogram/Session24654.html

Commerical aircraft Inadvertent cloud seeding
605/610 (Washington State Convention Center)
Andrew Heymsfield, NCAR, Boulder, CO; and A. Bansemer, G. Thompson, H. Morrison, R. Rasmussen, Z. Wang, D. Zhang, and P. Minnis

The production of "hole punch" clouds and snow precipitation development in supercooled liquid clouds from turboprop and jet aircraft is documented. Ice is produced by piston through turboprop aircraft via cooling behind the propellers (APIPS) and by private through commercial jet aircraft by cooling over the wings (aerodynamic contrails). Once ice is produced dynamical processes can kick in and cause local updrafts via latent heating in the ice regions and subsidence around them affected region. The updrafts suspend the ice particles which continue to grow and produce latent heating, expanding the updraft area laterally. Using observations and the WRF model, we show that the area of influence can last for two or more hours. Broader implications of this inadvertent seeding will be discussed.
https://ams.confex.com/ams/91Annual/webprogram/Paper179862.html

NASA has identified water vapor emission into the upper atmosphere from commercial transport aircraft, particularly as it relates to the formation of persistent contrails, as a potential environmental problem. Since 1999, MSE has been working with NASA-LaRC to investigate 
the concept of a transport-size emissionless aircraft fueled with liquid hydrogen combined with other possible breakthrough technologies.
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20050170447_2005172301.pdf

Aircraft-induced Hole Punch and Canal Clouds - AMS:
http://journals.ametsoc.org/doi/pdf/10.1175/2009BAMS2905.1

Observations of glaciating hole punch clouds: Cornell University
http://arxiv.org/ftp/arxiv/papers/0907/0907.4302.pdf

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