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How well do we model marine aerosols, and why?

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Presentation on theme: "How well do we model marine aerosols, and why?"— Presentation transcript:

1 How well do we model marine aerosols, and why?
Kostas Tsigaridis

2 Kostas Tsigaridis, Columbia University/NASA GISS
Sea spray 1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

3 Kostas Tsigaridis, Columbia University/NASA GISS
Sea spray Solubility (hygroscopicity) Aerosol composition  cloud formation Clouds  aerosol formation Clouds  aerosol removal Dissolved aerosols into clouds  cloud properties & lifetime 1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

4 Kostas Tsigaridis, Columbia University/NASA GISS
Sea spray source Gong (2003) 1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

5 Kostas Tsigaridis, Columbia University/NASA GISS
Sea spray source Tsigaridis et al., JGR, submitted Fine mode Coarse mode SS1 0.1-1μm 1-4μm SS2 1-10μm SS3 μm 0.5-4μm 1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

6 Sea salt comparison with measurements
Prospero and Savoie dataset, University of Miami Sea salt comparison with measurements 1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

7 Sea salt comparison with measurements
Tsigaridis et al., JGR, submitted 1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

8 Kostas Tsigaridis, Columbia University/NASA GISS
Sea salt vs. wind speed Tsigaridis et al., JGR, submitted 1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

9 Sea salt size distribution (dry radius)
Fine (μg) Source (Tg a-1) Coarse (μg) Reference 0.1-1 1734 1-4 Koch et al., 2006 >0.5 Vignati et al., 2010 Myriokefalitakis et al., 2010 0.5-4 Jaeglé et al., 2010 * 1500 0.25-6* Long et al., 2011 0.7 14.8 0.5-5 Meskhidze et al., 2011 * Approximate values based on wet size at 80%RH: and They are the composite of 8 bins. 1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

10 Sea-spray organic enrichment
SeaWiFS, 2000 O’Dowd et al., 2008 Vignati et al., 2010 1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

11 Organic enrichment vs. size
Gantt et al., 2011 Models’ sea salt (sea spray) fine/coarse threshold 1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

12 Organic enrichment vs. wind speed
Gantt and Meskhidze, 2011 1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

13 Organics comparison with measurements
Tsigaridis et al., JGR, submitted Without oceanic organics 1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

14 Organics comparison with measurements
Tsigaridis et al., JGR, submitted With oceanic organics 1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

15 Organics comparison with measurements
Tsigaridis et al., JGR, submitted 1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

16 Oceanic aerosol budget
Tracer Source (Tg a-1) Lifetime (days) Reference Sea salt Vignati et al., 2010 Myriokefalitakis et al., 2010 1.03, 0.5 Jaeglé et al., 2010 1500 Long et al., 2011 Oceanic OA Duce et al., 1983 (TgC a-1) Spracklen et al., 2008 75 (TgC a-1) Roelofs, 2008 (TgC a-1) Gantt et al., 2009 8.2+9 2.2 7-8 4.5 29 (TgC a-1) 17.7 (TgC a-1) Westervelt et al., 2011 1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

17 Oceanic aerosol budget
Tsigaridis et al., JGR, submitted Source (Tg a-1) Lifetime (days) Fine Coarse Sea salt SS1 – Gong 360 (280) 2330 1.4 (1.5) 1.1 SS2 – Gong 5100 0.4 SS3 – Gong 36 (28) 2660 SS1 – Jaegle 310 (250) 2020 1.3 (1.4) Organics 75 - 1.5 7.5 65 1.4 Fine mode Coarse mode SS1 0.1-1μm 1-4μm SS2 1-10μm SS3 μm 0.5-4μm 1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

18 Southern Ocean aerosol optical depth
Tsigaridis et al., JGR, submitted SS1 SS2 SS3 SS1 SS2 SS3 SS1 SS2 SS3 Fine mode Coarse mode SS1 0.1-1μm 1-4μm SS2 1-10μm SS3 μm 0.5-4μm 1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

19 Aerosol concentration changes
Tsigaridis et al., JGR, submitted Sea salt Organic aerosol Wind speed 1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

20 Kostas Tsigaridis, Columbia University/NASA GISS
Sea-salt vs. wind speed Tsigaridis et al., JGR, submitted 1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

21 Kostas Tsigaridis, Columbia University/NASA GISS
CDNC changes Tsigaridis et al., JGR, submitted 1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

22 Kostas Tsigaridis, Columbia University/NASA GISS
AeroCom models 1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

23 AeroCom models – sea salt source
1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

24 AeroCom models – sea salt load
1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

25 Kostas Tsigaridis, Columbia University/NASA GISS
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? 1/3/2019 Kostas Tsigaridis, Columbia University/NASA GISS

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