HR: 0800h
AN: A31B-0833    [Abstracts]
TI: A Detailed Closure Study of CCN in the Northeastern United States
AU: * Medina, J
EM: jmedina@chbe.gatech.edu
AF: Georgia Institute of Technology, School of Chemical Engineering 311 Ferst Drive NW, Atlanta, GA 30332 United States
AU: Nenes, A
EM: nenes@eas.gatech.edu
AF: Georgia Institute of Technology, School of Chemical Engineering 311 Ferst Drive NW, Atlanta, GA 30332 United States
AU: Cottrell, L
EM: ldc@gust.sr.unh.edu
AF: University of New Hampshire, Institute for the Study of Earth, Oceans, and Space 39 College Road, Durham, NH 03824 United States
AU: Griffin, R
EM: rob.griffin@unh.edu
AF: University of New Hampshire, Institute for the Study of Earth, Oceans, and Space 39 College Road, Durham, NH 03824 United States
AB: Ground measurements of cloud condensation nuclei (CCN) were made during July and August of 2004 as part of the NEAQS ITCT-2K4 (New England Air Quality Study - Intercontinental Transport and Chemical Transformation 2004) mission at the Thompson Farm sampling site maintained by the University of New Hampshire. Two continuous-flow streamwise thermal gradient CCN instruments (built by Droplet Measurement Technologies, Inc.) were used for the measurements. The first instrument operated counted CCN concentrations of ambient sample air, while the second counted CCN concentrations of sample air, first classified by a differential mobility analyzer. The supersaturation spectra included 5 settings that ranged from 0.2% to 0.6% every 5 minutes each. To further constrain the measurements, chemical composition of the aerosol was obtained from an Aerodyne Aerosol Mass Spectrometer. By combining both measurements together, the CCN mixing state, as well as insight into the chemical composition and closure can be assessed.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0320 Cloud physics and chemistry
DE: 3311 Clouds and aerosols
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005