Accession Number:

ADA058606

Title:

Measurement and Identification of Aerosols Collected Near Barrow, Alaska,

Descriptive Note:

Corporate Author:

COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H

Personal Author(s):

Report Date:

1978-07-01

Pagination or Media Count:

13.0

Abstract:

Measurements of the concentrations of Aitken nuclei in maritime air were made near Barrow, Alaska, in June 1975 with a modified Nolan-Pollack small-particle detector. The concentrations varied from 50 to 300 particles cc depending upon meteorological conditions. The mean Aitken nuclei count was 100 particles cc for diameters greater than .002 micrometers. Transmission electron micrographs of aerosols in maritime air near Barrow were taken. The size range was measured to be 0.01 to 2.5 micrometers in diameter with the most frequently observed diameter being 0.04 micrometers. The volume of the maritime air and the collection efficiency of aerosol particles on filmed grids for electron microscopy were measured. The aerosol concentrations were found to be 76 to 101 particles cc the mean concentration was calculated to be 87 particles cc. The aerosol particles in the maritime air were identified by electron microscopy and selected area electron diffraction analysis. About 20 of the aerosol particles were identified, and 80 of the particles were too small for electron diffraction analysis. Sea salt particles constituted 2 of the total, and clay minerals 3 these particles were considered to be of natural origin. Solid combustion by-products such as coagulated carbon particles and flyash particles constituted 16. Despite the comparative remoteness of the sampling site, the measurements indicate that many anthropogenic aerosols were found using an electron microscope. Author

Subject Categories:

  • Atmospheric Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE