Constraining the budget of DMS in the remote marine boundary layer - results from the Pacific Atmospheric Sulfur Experiment (PASE)
Abstract
The Pacific Atmosphere Sulfur Experiment (PASE) investigated the chemistry of sulfur in the remote, unpolluted marine boundary layer of the equatorial Pacific. The experiment was conducted in the vicinity of Christmas Island (2N, 157W) using the NCAR C-130 aircraft. High rate (25 Hz) measurements of DMS, SO2 and wind speeds were made along with low rate measurements of OH, HO2, aerosol size spectra, and other species. The flights were typically flown at altitudes corresponding to the surface layer, middle and top of the boundary layer, as well as the buffer layer above (where most of the trade wind cumulus resided). Horizontal and vertical fluxes were measured to constrain the scalar budgets of DMS and SO2. Preliminary results suggest a large and persistent sink of DMS in addition to reaction with OH. Reactions of DMS with BrO and Cl are considered as potential candidates with concentrations estimated from bromine and chlorine depletion in sampled sea salt particles.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2007
- Bibcode:
- 2007AGUFM.A51D0731C
- Keywords:
-
- 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 0305 Aerosols and particles (0345;
- 4801;
- 4906);
- 0312 Air/sea constituent fluxes (3339;
- 4504);
- 0317 Chemical kinetic and photochemical properties;
- 0322 Constituent sources and sinks