Urban Influences on Fog.
Abstract
This report summarizes the first year of work on the in-house laboratory independent research project Factors Affecting Atmospheric Secular Trends in Wartime. The first step was to make a through literature survey of what is presently known about anthropogenic influences on atmospheric trends. This survey revealed that there is no general agreement concerning some basic questions, i. e., in which season the urban heat island is strongest. Water vapor in fog was investigated. Large year-to-year fluctuations in meteorological conditions at three German stations masked any trend in mean dew point in fog which otherwise might have occurred during a period in which the number of automobiles increased more than 20 times. This effect was partially eliminated by comparing hours when the atmosphere is very stable with less stable hours during which anthropogenically produced water vapor is likely to be diluted by mixture through a deep layer. Berlin and Frankfurt showed a trend in winter in which dew points during stable hours increased relative to those during less stable times. Dew points during fog in winter and spring at Frankfurt also increased with time relative to dew points during fog at two nearby small towns. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1982
- Accession Number
- ADA130016
Entities
People
- Dorathy A. Stewart
Organizations
- United States Army Aviation and Missile Command