February 28, 2007
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FROM VOLUME 5, NUMBER 9, SEPTEMBER 1992
SULFUR CYCLE, CLOUD NUCLEI
Two items from J. Geophys. Res., 97(D9), June 20, 1992:
"Modeling a Case of Particle Nucleation in the Marine Boundary Layer,"
D.A. Hegg (Dept. Atmos. Sci., Univ. Washington, AK-40, Seattle WA 98195), D.S.
Covert, V.N. Kapustin, 9851-9857. A three-mode integral nucleation model
predicted particle concentrations in accord with observations when initialized
with the appropriate field measurements. Further analysis elucidated conditions
favorable for nucleation at the ocean surface.
"Variations in the Methanesulfonate to Sulfate Molar Ratio in
Submicrometer Marine Aerosol Particles over the South Pacific Ocean," T.S.
Bates (PMEL, NOAA, 7600 Sand Pt. Way NE, Seattle WA 98115), J.A. Calhoun, P.K.
Quinn, 9859-9865. An inverse correlation was found between atmospheric
temperature and the MSA to nss SO42-molar ratio in submicrometer aerosol
particles, consistent with laboratory results, but contrary to Southern
Hemisphere baseline station data. Implications are discussed.
"Low Yields of SO2 from Dimethyl Sulfide Oxidation in the Marine
Boundary Layer," A.R. Bandy (Chem. Dept., Drexel Univ., Philadelphia PA
19104), D.L. Scott et al., Geophys. Res. Lett., 19(11), 1125-1127, June 2, 1992.
Low efficiency of conversion of DMS to SO2 is the most likely
explanation for the low SO2 levels observed in the marine boundary layer off the
coast of Washington state.
Comment and reply on "Measurements of Aitken Nuclei
and Cloud Condensation Nuclei in the Marine Atmosphere and Their Relation to the
DMS-Cloud-Climate Hypothesis," J. Geophys. Res., 97(D7), 7657-7658, May 20,
"Dynamics of Dimethyl Sulfide and Dimethylsulfonioproprionate in
Oceanic Water Samples," R.P. Kiene (Univ. Georgia Marine Inst., Sapelo
Island GA 31327), Marine Chem., 37(1-2), 29-52, Mar. 1992.
Measurements in incubated samples of surface seawater suggest an alternative
pathway for DMSP metabolism which could limit the production of
DMS. They also suggest a dynamic biological cycling of DMS in open waters, with
significant rates of simultaneous production and consumption.
"Infrared Absorption Spectra and Integrated Band Intensities for
Gaseous Methanesulphonic Acid (MSA)," N. Mihalopoulos (Physik. Chemie,
Fachbereich 9, Bergische Univ. Gesamthochschule Wuppertal, 5600 Wuppertal 1,
Ger.), I. Barnes, K.H. Becker, Atmos. Environ., 26A(5), 807-812, 1992.
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