HR: 1330h
AN: A22A-1051    [PDF]
TI: Ice Nucleation in Low-Temperature Aircraft Contrails During CRYSTAL-FACE
AU: * Herman, R L
EM: robert.l.herman@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, M/S 183-401, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Heymsfield, A J
EM: heyms1@ncar.ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307 United States
AU: Roskovensky, J K
EM: jrosko@atmos.ucla.edu
AF: Department of Atmospheric Sciences, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, CA 90095 United States
AU: Liou, K N
EM: knliou@atmos.ucla.edu
AF: Department of Atmospheric Sciences, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, CA 90095 United States
AU: Miake-Lye, R C
EM: rick@aerodyne.com
AF: Aerodyne Research Inc., 45 Manning Road, Billerica, MA 01821 United States
AU: King, M D
EM: king@climate.gsfc.nasa.gov
AF: NASA Goddard Space Flight Center, Code 900, Greenbelt, MD 20771 United States
AU: McGill, M J
EM: matthew.j.mcgill.1@gsfc.nasa.gov
AF: NASA Goddard Space Flight Center, Code 900, Greenbelt, MD 20771 United States
AU: Bui, T P
EM: pbui@mail.arc.nasa.gov
AF: NASA Ames Research Center, M/S 245-4, Moffett Field, CA 94035 United States
AB: Upper tropospheric ice clouds and aircraft condensation trails (contrails) were studied by both remote sensing instruments on the NASA ER-2 high-altitude aircraft and {\it in situ} atmospheric sampling instruments on the NASA WB-57F aircraft as part of the NASA CRYSTAL-FACE mission. During the Southern survey flights of July 9 and July 26, 2002, over the Caribbean Sea, non-persistent and persistent visible contrails were produced by the WB-57F aircraft and imaged by the MODIS Airborne Simulator (MAS), flying at higher altitude on the ER-2. These contrails were located in the vicinity of the local tropopause, where ambient temperatures were very low (minus 74 to minus 78$\deg$C). A consistent relation was found between contrail lifetime and ambient humidity, as measured by the JPL Laser Hygrometer (JLH) using temperatures from the WB-57F Meteorological Measurement System (MMS). We will discuss contrail physical properties in relation to nearby cirrus clouds, sensitivities of different MAS channels to contrail properties, {\it in situ} measurements of humidity and particles, and model simulations of ice nucleation and growth, and contrail dispersal.
DE: 0320 Cloud physics and chemistry
DE: 3360 Remote sensing
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting