HR: 17:15h
AN: A54B-06    [Abstracts]
TI: Recent Field Studies and an Improved Understanding of Aerosol / Ice Cloud Interactions
AU: * Cziczo, D J
EM: djcziczo@al.noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway R/AL 6, Boulder, CO 80305 United States
AU: * Cziczo, D J
EM: djcziczo@al.noaa.gov
AF: University of Colorado, CIRES, 216 UCB, Boulder, CO 80309 United States
AU: DeMott, P J
EM: pdemott@lamar.colostate.edu
AF: Colorado State University, Department of Atmospheric Science, 200 West Lake Street, Fort Collins, CO 80523 United States
AU: Brooks, S D
EM: sbrooks@lamar.colostate.edu
AF: Colorado State University, Department of Atmospheric Science, 200 West Lake Street, Fort Collins, CO 80523 United States
AU: Prenni, A J
EM: prenni@lamar.colostate.edu
AF: Colorado State University, Department of Atmospheric Science, 200 West Lake Street, Fort Collins, CO 80523 United States
AU: Thomson, D S
EM: dthomson@al.noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway R/AL 6, Boulder, CO 80305 United States
AU: Thomson, D S
EM: dthomson@al.noaa.gov
AF: University of Colorado, CIRES, 216 UCB, Boulder, CO 80309 United States
AU: Kreidenweis, S M
EM: sonia@chem.atmos.colostate.edu
AF: Colorado State University, Department of Atmospheric Science, 200 West Lake Street, Fort Collins, CO 80523 United States
AU: Murphy, D M
EM: dmurphy@al.noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway R/AL 6, Boulder, CO 80305 United States
AB: It has been known for several decades that aerosol particles can nucleate the ice phase, and thus form clouds, via two distinct processes: homogeneous freezing of an aqueous medium and heterogeneous action by solid components known as ice nuclei. In the past several years laboratory studies of the freezing properties of aerosols representative of those found in the troposphere have been conducted and cloud residue analyses have described some of the attributes of ice nuclei. A recent emphasis has been placed on conducting field missions to better understand aerosol / ice cloud interactions. These studies, including CRYSTAL-FACE and INSPECT, have greatly increased our understanding of the composition of ice forming particles, and the mechanisms by which they freeze. For example, single particle instruments have shown that ice nuclei originate from a small subset of atmospheric particles and that aerosol composition, namely organic content, affects homogeneous freezing. Episodic events, such as dust storms, have been shown to have a significant effect on cloud properties and may change the mechanism by which freezing occurs. Ultimately, these data may improve our ability to model aerosol / cloud interactions and better predict the effect of anthropogenic perturbations.
UR: http://lamar.colostate.edu/~pdemott/spl/Splproj.htm
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0320 Cloud physics and chemistry
DE: 0365 Troposphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting