Dimethyl sulfide, methane sulfonic acid and physicochemical aerosol properties in Atlantic air from the United Kingdom to Halley Bay

摘要: The concentrations of dimethyl sulfide in air were obtained during a cruise between the United Kingdom and Antarctic period October 1992 to January 1993 using method sampling analysis optimized avoid interferences from oxidants. In equatorial regions (30°N 30°S) atmospheric DMS concentration ranged 3 46 ng (S) m−3, with an average 18 m−3. polar waters south Falkland Islands, 714 m−3 observed, mean 73 range oxidation products also obtained. No clear relationships reactant product seen. Information on particle number concentration, Fuchs surface area thermal volatility characteristics ambient aerosol was obtained, but again no sulfur observed. Accumulation mode averaged 25 cm−3 clean marine masses 58°S while background condensation nuclei (CN) order 400–600 cm−3. Simplistic calculations suggest that source strength about 20–60 particles d−1 is required sustain this CN concentration. It not whether boundary layer nucleation new or entrainment free troposphere provided CN. Periods elevated (>4000 cm−3) regularly observed over Weddell Sea attributed “bursts” formation. However, shortly after these events rapidly decayed level through coagulation losses, suggesting little impact cloud (CCN)