Maritime Infrared Propagation: Particle Size Distribution Measurements Using a Helicopter-Borne Aerosol Counter.
Abstract
Particle size distribution measurements were made on nine successive days in late August 1980 using a PMS FSSP-100 aerosol counter flown on a Wessex Mk 5 helicopter. In all, 14 flights were made giving data at two heights, 30 and 100 ft above the sea surface, extending from our measurement site at Ardivachar Point on the island of South Uist in the Outer Hebrides out over the sea to a distance of 20 km. The results for the day, 25 August, on which the most truly 'maritime' conditions were experienced have been omitted since they are distorted by the helicopter flying through occasional very thin wisps of cloud well out to sea. Lumping together the data from the remaining days leads to the highly encouraging conclusion that the aerosol content of the atmosphere over the shallow water near the island does not differ significantly from that over deep water. The results also underline the crucial importance of air mass history and the power and value of the radon-counting technique. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1981
- Accession Number
- ADA111255
Entities
People
- R. R. Allan
- S. Craig
Organizations
- Royal Aircraft Establishment