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Representative Values of Icing-Related Variables Aloft in Freezing Rain and Freezing Drizzle.

ADA307822

Publication Date	1996
Personal Author	Jeck, R. K.
Page Count	60
Abstract	Radiosonde and surface observations in freezing rain (ZR) and freezing drizzle (ZL), and a limited number of aircraft measurements in ZR, have been examined for information on the magnitude and altitude dependence of meteorological variables associated with aircraft icing in these conditions. The variables include temperature aloft, humidity (clouds), and windshear from the radiosondes; surface temperatures, ceiling heights, precipitation type and amount from the surface observations; and temperature, dropsize, rainwater concentration, and icing rate from the instrumented aircraft. To overcome the inadequacy of median volume diameter (MVD) as a measure of dropsize for these large droplet conditions, a convention for reporting the ZR or ZL water concentration over a few coarse dropsize intervals is proposed.
Keywords	Ice formation Rain Aviation accidents Air flow Atmospheric temperature Meteorological data Temperature gradients Freezing Raindrops Fuselages Wind shear Takeoff Civil aviation Aviation safety Surface temperature Cloud cover Aircraft landings Humidity Ice forecasting Ice prevention Aircraft icing Atmospheric boundary layer
Source Agency	Non Paid ADAS
NTIS Subject Category	55C - Meteorological Data Collection, Analysis, & Weather Forecasting 85A - Air Transportation
Corporate Authors	Federal Aviation Administration Technical Center, Atlantic City, NJ.
Document Type	Technical Report
Title Note	Technical note.
NTIS Issue Number	199619

Representative Values of Icing-Related Variables Aloft in Freezing Rain and Freezing Drizzle.

Representative Values of Icing-Related Variables Aloft in Freezing Rain and Freezing Drizzle.
ADA307822

Publication Date	1996
Personal Author	Jeck, R. K.
Page Count	60
Abstract	Radiosonde and surface observations in freezing rain (ZR) and freezing drizzle (ZL), and a limited number of aircraft measurements in ZR, have been examined for information on the magnitude and altitude dependence of meteorological variables associated with aircraft icing in these conditions. The variables include temperature aloft, humidity (clouds), and windshear from the radiosondes; surface temperatures, ceiling heights, precipitation type and amount from the surface observations; and temperature, dropsize, rainwater concentration, and icing rate from the instrumented aircraft. To overcome the inadequacy of median volume diameter (MVD) as a measure of dropsize for these large droplet conditions, a convention for reporting the ZR or ZL water concentration over a few coarse dropsize intervals is proposed.
Keywords	Ice formation Rain Aviation accidents Air flow Atmospheric temperature Meteorological data Temperature gradients Freezing Raindrops Fuselages Wind shear Takeoff Civil aviation Aviation safety Surface temperature Cloud cover Aircraft landings Humidity Ice forecasting Ice prevention Aircraft icing Atmospheric boundary layer
Source Agency	Non Paid ADAS
NTIS Subject Category	55C - Meteorological Data Collection, Analysis, & Weather Forecasting 85A - Air Transportation
Corporate Authors	Federal Aviation Administration Technical Center, Atlantic City, NJ.
Document Type	Technical Report
Title Note	Technical note.
NTIS Issue Number	199619