Accession Number:

ADA071787

Title:

Microphysical and Optical Properties of California Coastal Fogs at Fort Ord.

Descriptive Note:

Research and development technical rept.,

Corporate Author:

ARMY ELECTRONICS RESEARCH AND DEVELOPMENT COMMAND WSMR NM ATMOSPHERIC SCIENCES LAB

Report Date:

1979-06-01

Pagination or Media Count:

38.0

Abstract:

During the period of 12 April through 12 May 1978, the Atmospheric Sciences Laboratory obtained meteorological, optical, and microphysical data in support of the Copperhead optical system performance test under inclement weather conditions. On 3 and 9 May, two well-developed heavy fogs occurred which would seriously degrade the performance of the Copperhead optical system. The first fog was of the advection type and the latter the radiation type but aided by gentle advection. While their synoptic geneses were only briefly touched upon, their microphysical features were examined in greater detail. The radiation fog on 9 May contained twice as much liquid water as the advection fog on 3 May although they both had a haze regime. Comparisons were made with other California coastal fogs to draw a general picture of their microstructures. On the basis of limited data, these fogs appeared to share certain common features such as mean and mode radii and liquid water content. For their optical properties in the visible region, the data points of these two fogs were plotted against Lows generalized or equivalent regression line. About 83 percent of them fall within 15 percent deviation, and all lie within 50 percent deviation. Moreover, the line holds better for the 3 May case than for the 9 May case. Pending further verification, the present study seems to indicate that Lows scaling law may be incorporated as an interim model. Author

Subject Categories:

  • Meteorology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE