HR: 08:00h
AN: A11B-01    [PDF]
TI: Tropical Anvil Cirrus Microphysics
AU: * Heymsfield, A
EM: heyms1@ucar.edu
AF: NCAR, 1850 Table Mesa Dr., Boulder, CO 80305 United States
AU: Bansemer, A
EM: bansemer@ucar.edu
AF: NCAR, 1850 Table Mesa Dr., Boulder, CO 80305 United States
AU: Schmitt, C
EM: schmittc@ucar.edu
AF: NCAR, 1850 Table Mesa Dr., Boulder, CO 80305 United States
AU: Baumgardner, D
EM: darrel@servidor.unam.mx
AF: Universidad Nacional Autonoma de Mexico, Centro de Ciencias de la Atmosfera - UNAM, Circuito Exterior s/n, Ciudad Universitaria, Mexico City, 04510 Mexico
AU: Poellot, M
EM: poellot@aero.und.edu
AF: University of North Dakota, Dept. of Atmospheric Sciences, Clifford Hall, Room 400 4149 Campus Road, Grand Forks, ND 58202 United States
AU: Twohy, C
EM: twohy@coas.oregonstate.edu
AF: Oregon State University, College of Oceanic and Atmospheric Sciences, Oceanography Admin 104, Corvallis, OR 97331 United States
AU: Weinstock, E M
EM: elliot@huarp.harvard.edu
AF: Harvard University, Dept. of Chemistry and Chemical Biology, 12 Oxford St., Cambridge, MA 02138 United States
AU: Smith, J T
EM: jxsmith@huarp.harvard.edu
AF: Harvard University, Dept. of Chemistry and Chemical Biology, 12 Oxford St., Cambridge, MA 02138 United States
AU: Sayres, D
EM: sayres@huarp.harvard.edu
AF: Harvard University, Dept. of Chemistry and Chemical Biology, 12 Oxford St., Cambridge, MA 02138 United States
AU: Avallone, L
EM: avallone@lasp.colorado.edu
AF: University of Colorado, Laboratory for Atmospheric and Space Physics, 590 UCB, Boulder, CO 80309 United States
AU: Hallar, G
EM: hallar@lasp.colorado.edu
AF: University of Colorado, Laboratory for Atmospheric and Space Physics, 590 UCB, Boulder, CO 80309 United States
AB: This study synthesizes data collected during a number of field campaigns by in-situ aircraft to characterize the microphysical properties of tropical, convectively-generated cirrus. The field campaigns include the Tropical Rain Measuring Mission KWAJEX campaign near Kwajalein, M. I., KAMP (the Keys Area Microphysics Project) and the Cirrus Regional Study of Tropical Anvils and Cirrus Layers (CRYSTAL) Florida Area Cirrus Experiment (FACE), both over southern Florida, and CAMEX-4 (the fourth convection and moisture experiment), studying hurricanes off the east coast of Florida. The measurements include particle size distribution and particle shape information, direct measurements of the condensed water content (CRYSTAL-FACE), and radar imagery. We examine the temperature dependence and vertical variability of the ice water content (IWC), extinction, and effective radii, and deduce the ensemble-mean ice particle densities. Data obtained in quiescent regions outside of convection are compared to observations within convective cells. The relationship between the properties of the particle size distributions and proximity to convection are examined. The IWCs show a strong temperature dependence and dependence on distance below cloud top. The IWCs are larger in the convective regions than in the quiescent regions, and the particle size distributions are markedly broader. Ensemble-mean ice particle densities are a strong function of the breadth of the particle size distributions.
DE: 3314 Convective processes
DE: 3354 Precipitation (1854)
DE: 3374 Tropical meteorology
DE: 3394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting