Optical particle counter measurement of marine aerosol hygroscopic growth

by J. R. Snider, M. D. Petters
Atmospheric Chemistry and Physics Discussions ()
Get full text at journal

Abstract

A technique is developed for the determination of the hygroscopic growth factor of dry particles with diameter between 0.3 and 0.6 mu m 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. D<0.9 mu m. 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.

Cite this document (BETA)

Authors on Mendeley

Readership Statistics

18 Readers on Mendeley
by Discipline
 
44% Earth Sciences
 
39% Environmental Sciences
 
11% Chemistry
by Academic Status
 
22% Ph.D. Student
 
22% Post Doc
 
17% Assistant Professor
by Country
 
11% United States
 
6% Italy
 
6% South Africa

Sign up today - FREE

Mendeley saves you time finding and organizing research. Learn more

  • All your research in one place
  • Add and import papers easily
  • Access it anywhere, anytime

Start using Mendeley in seconds!

Sign up & Download

Already have an account? Sign in