HR: 1340h
AN: A33B-1178 [Abstracts]
TI: Atmospheric Measurements Aboard C-130 During the Pacific Atmospheric Sulfur Experiment
AU: * Yanchilina, A G
EM: nyanchil@gmail.com
AF: SOARS PROGRAM (Significant Opportunities in Atmospheric Research and Science) at
UCAR (University Corporation for Atmospheric Research), 3085 Center Green Dr., Boulder, CO 80301, United
States
AU: Mauldin, L
EM: mauldin@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-5000,
United States
AU: Anderson, R
EM: rca@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-5000,
United States
AB:
The Pacific Atmospheric Sulfur Experiment (PASE) is a study with a primary goal aimed at understanding the
sulfur cycle in a remote marine atmosphere. The study will be conducted in August and September months of
2007 at Christmas Island on board the NSF/NCAR C-130 aircraft. It will foremost focus on measurements of
DMS (dimethyl sulfide) and its contribution to formation of H2SO4 (sulfuric acid) and MSA (methane-sulfonic acid)
by reaction with OH (hydroxyl). PASE will also concentrate on subsequent production of aerosols and cloud
condensation nuclei from H2SO4, MSA, and NH3 concentrations in a cloud free convective boundary layer (CBL)
and in outflow of marine cumulus. This study explains the measurement technique for OH, H2SO4, MSA, HO2,
HO2+RO2 (peroxy radicals), and NH3 (ammonia) using the SICIMS (Selected ion chemical ionization mass
spectrometer). It also presents sample measurements from research flights of OH, H2SO4, MSA, HO2, and
HO2+RO2. In addition, this paper discusses the measurement technique utilized aboard the C-130 in testing
SO2, DMS, DMSO (dimethyl sulfoxide), DMSO2 (dimethyl sulfone), O3 (ozone), aerosols, and cloud condensation
nuclei. It includes several adaptations to technique and instrumentation from previous studies conducted: the
First Aerosol Characterization Experiment (ACE-1) in 1998, the Pacific Exploratory Missions A and B (PEM-
Tropics) in 1996, and the Intercontinental Transport Experiment (INTEX-B) in 2006.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0312 Air/sea constituent fluxes (3339, 4504)
DE: 0488 Sulfur cycling
DE: 0850 Geoscience education research
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting