Estimation of Absolute Humidity during Morning Fog in Central Europe.
ARMY MISSILE RESEARCH AND DEVELOPMENT COMMAND REDSTONE ARSENAL ALA PHYSICAL SCIENCES DIRECTORATE
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A tentative estimate of the distribution of the absolute humidity during fog in Central Europe is given via the frequency distribution of the temperature, assuming 100 relative humidity. Only the morning hours were examined for 10 stations. It was learned that 7.5 gcu meter is exceeded in only one-third of the cases, of which 80 occur in summer and fall. An absolute humidity higher than 9.4 gcu meter is encountered in 7 of the fog cases in spring and 18 in fall. Fall contributed 45 to the annual fog occurrence. While the threshold of 9.4 gcu meter is exceeded in two-thirds of the summer cases, the total contribution from summer fogs to the entire number of fogs during the year is only 15. The frequency distribution of the absolute humidity during fog is exhibited and can be converted to visual range for electro-optical systems when the functional relationship absolute humidity-electro-optical system is known. Author