HR: 0800h
AN: A11C-0074    [Abstracts]
TI: Aerosol Transport to the Greenland Summit Site, June, 2003 to August 2004
AU: * Cahill, T A
EM: tacahill@ucdavis.edu
AF: DELTA Group, Dept. of Chem. Eng./Materials Science, University of California, Davis, One Shields Ave, Davis, CA 95616 United States
AU: Cliff, S S
EM: sscliff@ucdavis.edu
AF: DELTA Group, Dept. of Chem. Eng./Materials Science, University of California, Davis, One Shields Ave, Davis, CA 95616 United States
AU: Jimenez-Cruz, M P
EM: mpjimenezcruz@ucdavis.edu
AF: DELTA Group, Dept. of Chem. Eng./Materials Science, University of California, Davis, One Shields Ave, Davis, CA 95616 United States
AU: Portnoff, L
EM: lportnoff@ucdavis.edu
AF: DELTA Group, Dept. of Chem. Eng./Materials Science, University of California, Davis, One Shields Ave, Davis, CA 95616 United States
AU: Perry, K
EM: perry@met.utah.edu
AF: DELTA Group, Dept. of Meteorology, University of Utah, 135 South 1460 East, Sal Lake City, UT 84112 United States
AU: McConnell, J
EM: jmcconn@dri.edu
AF: Desert Research Institute Division of Hydrologic Sciences, 2215 Raggio Parkway, Reno, NV 98512 United States
AU: Burkhart, J
EM: jburkhart@ucmerced.edu
AF: University of California, Merced, P.P. Box 2039, Merced, CA 95344 United States
AU: Bales, R C
EM: rbales@ucmerced.edu
AF: University of California, Merced, P.P. Box 2039, Merced, CA 95344 United States
AB: With the resumption of year-round staffing of the Summit Greenland Environmental Observatory (GEOSummit) in 2003, we were able to sample aerosols year round by size (8 size modes), time (3 hr to 24 hr), and composition (mass, optical attenuation, and elements H, Na to Mo, plus lead) for association with particulate layers in snow, firn and ice. Sampling was accomplished using a 10 L/min slotted 8-stage rotating drum impactor (DELTA 8 DRUM, http://delta.ucdavis.edu)in the clean sector 0.5 km upwind from the main camp pollution sources. The air intake was approximately 2m above the snow surface. The rotation rate of the DRUM was slowed to 0.5 mm/day, allowing continuous sampling for 48 weeks with 12-hr time resolution on a single set of lightly greased 480 ?g/cm2 Mylar substrates. Early results show transport of relatively coarse (12 to 5 ?m aerodynamic diameter) soil aerosols to the site in spring, 2003, in well -defined plumes of 1- to 2-day duration. Trajectory analysis shows potential Asian sources. Sulfur-containing aerosols, also seen in plumes of short duration, occur in two size modes, a typical accumulation mode aerosol (0.75?0.34 ?m) and a very fine aerosol mode ( 0.34?0.09 ?m), the latter likely stratospheric in origin. We wish to acknowledge the excellent on-site support of the GEOSummit staff, including M. Lewis, R. Abbott, B. Torrison, and K. Hess, and T. Wood.
UR: http://delta.ucdavis.edu
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
DE: 0368 Troposphere--constituent transport and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting