References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-8-1949-2008

Optical particle counter measurement of marine aerosol hygroscopic growth

Snider

J. R.

¹ Petters

M. D.

Department of Atmospheric Science Dept. 3038, University of Wyoming, 1000 East University Avenue, Laramie, WY 82071, USA

Department of Atmospheric Science 1371, Colorado State University, Campus Delivery Fort Collins, CO 80523-1371, USA

04 04 2008

8 7 1949 1962

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A technique is developed for the determination of the hygroscopic growth factor of dry particles with diameter between 0.3 and 0.6 μm and is applied to measurements made during the second Dynamics and Chemistry of Marine Stratocumulus experiment (DYCOMS-II). Two optical particle counters are utilized, one measures the aerosol size spectrum at ambient relative humidity and the other simultaneously dries the aerosol prior to light scattering detection. Growth factors are based on measurements made in the region of the Mie scattering curve where scattered light intensity increases monotonically with dry and wet particle diameter, i.e. <I>D</I><0.9 μm. Factors influencing the accuracy of the measurement are evaluated, including particle drying, refractive index and shape. Growth factors at 90±3% ambient relative humidity in marine airmasses 400 km west of San Diego, California range between 1.5 and 1.8. This suggests that a significant fraction of the particle mass, between 40 and 70%, is either non-hygroscopic or weakly hygroscopic.

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