HR: 0800h
AN: A31A-0805    [Abstracts]
TI: Determination of Chemical Composition of Marine Aerosol Particles and its Effects on Aerosol and Cloud Properties During the 2005 MASE Field Campaign
AU: * Lee, Y
EM: ynlee@bnl.gov
AF: Brookhaven National Lab, 75 Rutherford Dr./Bldg. 815E, Upton, NY 11973 United States
AU: Jayne, J
EM: jayne@aerodyne.com
AF: Aerodyne Research, 45 Manning Road, Billerica, MA 01821 United States
AU: Alexander, M
EM: mike.alexander@pnl.gov
AF: Pacific Northwest National Lab, P.O. Box 999/K9-34, Richland, WA 99352 United States
AU: Springston, S
EM: srs@bnl.gov
AF: Brookhaven National Lab, 75 Rutherford Dr./Bldg. 815E, Upton, NY 11973 United States
AU: Wang, J
EM: jian@bnl.gov
AF: Brookhaven National Lab, 75 Rutherford Dr./Bldg. 815E, Upton, NY 11973 United States
AU: Senum, G
EM: gsenum@bnl.gov
AF: Brookhaven National Lab, 75 Rutherford Dr./Bldg. 815E, Upton, NY 11973 United States
AU: Hubbe, J
EM: hubbe@pnl.gov
AF: Pacific Northwest National Lab, P.O. Box 999/K9-34, Richland, WA 99352 United States
AU: Daum, P
EM: phdaum@bnl.gov
AF: Brookhaven National Lab, 75 Rutherford Dr./Bldg. 815E, Upton, NY 11973 United States
AB: Marine stratus clouds play an important role in Earth's radiation budget. Cloud microphysical properties such as size distribution and liquid water concentration which govern the aerosol indirect radiative effects are influenced in part by chemical composition of the pre-cloud aerosol particles. To investigate the role aerosol particles play in the properties of marine stratus clouds, we measured aerosol and cloud properties on board the DOE G1 aircraft in the marine atmosphere between Point Reyes and Monterey Peninsula, California in the month of July as part of the 2005 Marine Stratus Experiment (MASE, http://www.asp.bnl.gov/MASE/, supported by the DOE Atmospheric Science and Atmospheric Radiation Measurement Programs). Aerosol chemical composition was measured using a PILS-IC and an Aerodyne AMS. The PILS-IC measured sodium, chloride, ammonium, nitrate, sulfate, potassium, calcium, magnesium, methanesulfonic acid, and format/acetate with a time resolution of 4 minutes and a limit of detection of ca. 0.2 microgram per cubic meter. The AMS measured size-resolved total organic compounds as well as ammonium, nitrate and sulfate at a one-minute time resolution. Other aerosol properties measured included size distribution, light scattering, light absorption and cloud condensation nuclei concentration. Measured cloud properties were cloud droplet size spectrum and liquid water concentration. We will report the chemical composition of aerosol particles and discuss the mechanisms governing their distributions and the relationships between aerosol chemical composition and aerosol and cloud properties.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0320 Cloud physics and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005