HR: 1330h
AN: A32B-0134 [PDF]
TI: Single Particle Measurements of the Chemical Composition of Cirrus Ice Residue
AU: * Cziczo, D J
EM: djcziczo@al.noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway R/AL6, Boulder, CO 80305 United States
AU: * Cziczo, D J
EM: djcziczo@al.noaa.gov
AF: CIRES, The University of Colorado, Boulder, CO 80309 United States
AU: Murphy, D M
EM: dmuphy@al.noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway R/AL6, Boulder, CO 80305 United States
AU: Hudson, P K
EM: phudson@al.noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway R/AL6, Boulder, CO 80305 United States
AU: Hudson, P K
EM: phudson@al.noaa.gov
AF: CIRES, The University of Colorado, Boulder, CO 80309 United States
AU: Thomson, D S
EM: dthomson@al.noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway R/AL6, Boulder, CO 80305 United States
AU: Thomson, D S
EM: dthomson@al.noaa.gov
AF: CIRES, The University of Colorado, Boulder, CO 80309 United States
AB:
The NOAA Aeronomy Laboratory's Particle Analysis by Laser Mass Spectrometry (PALMS) instrument is able to determine the
chemical composition of the particulate matter found in the atmosphere. Individual particles are brought into a vacuum system
where aerodynamic diameter is ascertained by the time required for passage between two visible laser beams. An excimer laser
is then pulsed to hit each aerosol and desorb and ionize molecules and atoms. A complete positive or negative spectrum is
provided by a time of flight mass spectrometer. The PALMS instrument was installed in the nose of a NASA WB-57F high altitude
research aircraft throughout the 2002 CRYSTAL-FACE mission. PALMS was used in conjunction with a Counterflow Virtual
Impactor (CVI) in order to separate ice crystals, which compose high altitude cirrus clouds, from the background aerosols
which did not freeze. The ice crystals were subsequently melted and evaporated and the residual particles upon which they had
formed were analyzed. The PALMS instrument was therefore able to determine what types of particles were responsible for the
formation of the cirrus clouds encountered during CRYSTAL-FACE. The results will help elucidate the mechanisms responsible
for ice formation in the atmosphere which are important to our understanding of the Earth's radiative budget.
UR: http://www.al.noaa.gov/PALMS/
DE: 0305 Aerosols and particles (0345, 4801)
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting