How well do we model marine aerosols, and why?

1. How well do we model marine aerosols, and why? Kostas Tsigaridis kostas.tsigaridis@columbia.edu kostas.tsigaridis@nasa.gov

2. Sea spray Kostas Tsigaridis, Columbia University/NASA GISS

3. Sea spray • Solubility (hygroscopicity) • Aerosol composition  cloud formation • Clouds  aerosol formation • Clouds  aerosol removal • Dissolved aerosols into clouds  cloud properties & lifetime Kostas Tsigaridis, Columbia University/NASA GISS

4. Sea spray source Gong (2003) Kostas Tsigaridis, Columbia University/NASA GISS

5. Sea spray source Tsigaridis et al., JGR, submitted Kostas Tsigaridis, Columbia University/NASA GISS

6. Prospero and Savoie dataset, University of Miami Sea salt comparison with measurements Kostas Tsigaridis, Columbia University/NASA GISS

7. Sea salt comparison with measurements Tsigaridis et al., JGR, submitted Kostas Tsigaridis, Columbia University/NASA GISS

8. Sea salt vs. wind speed Tsigaridis et al., JGR, submitted Kostas Tsigaridis, Columbia University/NASA GISS

9. Sea salt size distribution (dry radius) * Approximate values based on wet size at 80%RH: 0.022-0.5 and 0.5-12. They are the composite of 8 bins. Kostas Tsigaridis, Columbia University/NASA GISS

10. Sea-spray organic enrichment SeaWiFS, 2000 O’Dowd et al., 2008 Vignati et al., 2010 Kostas Tsigaridis, Columbia University/NASA GISS

11. Organic enrichment vs. size Gantt et al., 2011 Models’ sea salt (sea spray)fine/coarse threshold Kostas Tsigaridis, Columbia University/NASA GISS

12. Organic enrichment vs. wind speed Gantt and Meskhidze, 2011 Kostas Tsigaridis, Columbia University/NASA GISS

13. Organics comparison with measurements Tsigaridis et al., JGR, submitted Without oceanic organics Kostas Tsigaridis, Columbia University/NASA GISS

14. Organics comparison with measurements Tsigaridis et al., JGR, submitted With oceanic organics Kostas Tsigaridis, Columbia University/NASA GISS

15. Organics comparison with measurements Tsigaridis et al., JGR, submitted Kostas Tsigaridis, Columbia University/NASA GISS

16. Oceanic aerosol budget Kostas Tsigaridis, Columbia University/NASA GISS

17. Oceanic aerosol budget Tsigaridis et al., JGR, submitted Kostas Tsigaridis, Columbia University/NASA GISS

18. Southern Ocean aerosol optical depth Tsigaridis et al., JGR, submitted SS2 SS2 SS2 SS3 SS3 SS3 SS1 SS1 SS1 SS1 SS1 SS1 Kostas Tsigaridis, Columbia University/NASA GISS

19. Aerosol concentration changes Tsigaridis et al., JGR, submitted Sea salt Organic aerosol Wind speed Kostas Tsigaridis, Columbia University/NASA GISS

20. Sea-salt vs. wind speed Tsigaridis et al., JGR, submitted Kostas Tsigaridis, Columbia University/NASA GISS

21. CDNC changes Tsigaridis et al., JGR, submitted Kostas Tsigaridis, Columbia University/NASA GISS

22. AeroCom models Kostas Tsigaridis, Columbia University/NASA GISS

23. AeroCom models – sea salt source Kostas Tsigaridis, Columbia University/NASA GISS

24. AeroCom models – sea salt load Kostas Tsigaridis, Columbia University/NASA GISS

25. Concluding remarks • Sea salt sources differ by an order of magnitude in different global models • Sea spray sources and size distribution are critically important on oceanic OA fluxes • Oceanic OA sources are very uncertain and differ by an order of magnitude between models; sea spray sources are among the ones to blame • Sea salt number and size distribution? Removal? Kostas Tsigaridis, Columbia University/NASA GISS