Measurements of Ocean Derived Aerosol off the Coast of California T.S. Bates, P.K. Quinn, A. Frossard, L.M. Russell, D.J. Kieber, J. Hakala, and W.C. Keene.

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Presentation transcript:

Measurements of Ocean Derived Aerosol off the Coast of California T.S. Bates, P.K. Quinn, A. Frossard, L.M. Russell, D.J. Kieber, J. Hakala, and W.C. Keene

Particle-free air Inlet to sampling mast Air Curtain to seal off hood from ambient air Frit ( 1 m below the surface) Frits 1 m below surface Air Curtain

Sea Sweep Deployments May-June 2010

Comparison of unheated (ambient T) and heated SMPS size distributions 90% of the sub-100 nm mode remains after heating to 230°C indicating it is not sulfate or semi- volatile organics.

Hygroscopic Growth (dry to 90%RH) of Selected Particle Sizes Jani Hakala, Univ. Helsinki Aerosol is not internally mixed and is less hygroscopic than pure sodium chloride (GF=2.4)

Submicrometer Mass is in the nm Diameter size range

Submicrometer Sea Sweep 11 Aerosol Composition Sea salt was > 98% of the total submicrometer mass. Organic carbon was < 2%. Organic composition was 60% hydroxyl, 20% acid, 14% alkane, and 7% amine (A. Frossard, UCSD), similar to remote ocean measurements (Russell et al., 2010). But what is the composition of sub-100nm particles that dominate the number concentration?

Mass size distributions from the AMS Sea salt NO 3 upwelling Nutrient- rich waters SO 4 slightly enriched relative to seawater

Atomized Seawater Mass Spectrum Na 2 35 Cl + Na 2 37 Cl + 35 Need to develop sea water fragment waves

Conclusions The Sea Sweep generated aerosol has a tri-modal number size distribution with modes at 50-60nm, 30-40nm and nm. The submicrometer number size distribution and organic carbon content of the sea sweep generated aerosol is not a function of sea water chlorophyll or particulate organic carbon. The submicrometer number is non-volatile at 230°C and is externally mixed. The submicrometer organic material was composed primarily of hydroxyl groups. The method of generating particles at the ocean surface using the Sea Sweep shows promise for assessing the sources, composition, size, and cloud-nucleating properties of ocean-derived aerosol.

AMS inlet bounce Non-corrected slope 2.2

But…conversion of AMS mass to number……. ?