Air Pollution and Warm Fog Modification.
Abstract
Through a series of simple calculations on monodispersed fogs, it is shown that atmospheric air pollutants in the form of cloud condensation nuclei (CCN) contribute to a lowering of the visibility and, thereby, seriously inhibit the visibility-improving capability of some evaporation techniques of warm fog modification. In extreme pollution, where the CCN counts are in excess of 1000/cc and the initial visibility is, therefore, very low, those techniques that only depress relative humidity a few percent, for example, hygroscopic particle seeding, could be rendered almost powerless in improving visibility to practically useful levels. Those fog dispersal techniques that of practical necessity generally depress the relative humidity by more than five % such as thermal fog dispersal, are not so seriously hampered by atmospheric pollutants. (Modified author abstract)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 25, 1974
- Accession Number
- AD0786454
Entities
People
- Alan I. Weinstein
Organizations
- Air Force Cambridge Research Laboratories