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Simulate the vertical profile of methanesulfonic acid (MSA) over tropical Pacific

Simulate the vertical profile of methanesulfonic acid (MSA) over tropical Pacific. Yuzhong Zhang. CLAW hypothesis. Figure from en.wikipedia.org/wiki/ CLAW_hypothesis Charlson et al. , 1987. CLAW hypothesis. Figure from en.wikipedia.org/wiki/ CLAW_hypothesis Charlson et al. , 1987.

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Simulate the vertical profile of methanesulfonic acid (MSA) over tropical Pacific

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  1. Simulate the vertical profile of methanesulfonic acid (MSA) over tropical Pacific Yuzhong Zhang

  2. CLAW hypothesis Figure from en.wikipedia.org/wiki/CLAW_hypothesis Charlsonet al., 1987

  3. CLAW hypothesis Figure from en.wikipedia.org/wiki/CLAW_hypothesis Charlsonet al., 1987

  4. CLAW hypothesis Figure from en.wikipedia.org/wiki/CLAW_hypothesis Charlsonet al., 1987

  5. Marine sulfur chemistry Dimethyl sulfide (DMS) CH3SCH3 Methanesulfonic acid Nowak, et al., 2001 Gray, et al., 2010

  6. Model description • 1 dimensional model • Meteorology data from WRF • Chemistry • Aerosol scavenging • Dry deposition • Convection & turbulence • 5 minute time step. • Run 30 days for steady state solution

  7. PASE campaign Aug-Sep. 2007 Gray, et al, 2010

  8. Unknown source from the surface Aerosol scavenging 0.5x Unit: 10^6 molecule/cm2/s

  9. BrOinfluence & sensitivity to aerosol Unit: 10^6 molecule/cm2/s Surface emission No aerosol 13 w/ aerosol 2 1pptv BrO at 1st layer ? BrO oxidation scheme DMS + BrO DMSO + … DMSO + OH  MSIA + DMSO2 MSIA + OH  SO2 +MSA

  10. RH dependence and MSA degassing in FT • Abrupt change of liquid water under efflorescence point (EP), e.g. NaCl ~40% • Hypothesis: • Aerosol cannot take up MSA any more • MSA degases from aerosol phase, when RH < EP

  11. MSA budget in tropical pacific marine atmosphere

  12. Thank you!

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