Physical Characteristics of the Natural Atmospheric Aerosol.
Final technical rept. Mar 75-Sep 76,
DURHAM UNIV (ENGLAND) DEPT OF PHYSICS
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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.
- Atmospheric Physics