Trends in Atmospheric Visibility Across the United States from 1955 to 1972.
Abstract
Regular daytime synoptic observations from 14 stations across the United States, excluding observations with relative humidity greater than or equal to 90%, and with precipitation or fog present, were used to determine if a trend in the visibility, existed from 1955 to 1972. Trend analysis by comparison of statistics at the beginning and the end of the period and by linear regression of the monthly mean visibilities were used to uncover any relationship between visibility and other meteorological variables such as wind speed, wind direction, and relative humidity. Time series analysis of the visibility and relative humidity by spectrum and cross- spectrum analysis was also performed. The results of this study seem to indicate: (1) a deterioration of the visibility at all 14 stations, (2) a bimodal (six to twelve month) oscillation in the annual cycle of the visibility, and (3) that relative humidity is inversely correlated with the annual cycle of the visibility. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1978
- Accession Number
- ADA065509
Entities
People
- Jerrold Stuart Foster
Organizations
- Air Force Institute of Technology