Accession Number:

ADA036088

Title:

Physical Characteristics of the Natural Atmospheric Aerosol.

Descriptive Note:

Final technical rept. Mar 75-Sep 76,

Corporate Author:

DURHAM UNIV (ENGLAND) DEPT OF PHYSICS

Personal Author(s):

Report Date:

1976-10-01

Pagination or Media Count:

108.0

Abstract:

In this report an analysis is made of continuous measurements of the number and size distribution of submicrometre and large aerosol particles up to 5 micrometres in radius. An automated optical particle counter was used to take measurements at a 10 minute sampling frequency over a 49 day period at Durham Observatory, near Durham City, North East of England. Additional measurements were made at a remote mountain station at Great Dun Fell, 842 m msl and at an isolated maritime site. The averaged diurnal variation shows a maximum in particle number concentration from about 0200-0800 local time and a distinctive minimum over the period 1400-2000 hours. The particle number concentration follows a long-normal distribution. An analysis of the sampling frequency shows that the measurements could be made less frequently by factors up to 20, without loss of significant information.

Subject Categories:

  • Atmospheric Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE