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Cirrus characteristics derived from aircraft measurements at 18-28 μm during FIRE II

Cirrus clouds were the focus of an intensive field study in Kansas in November of 1991. During this period, measurements of the downwelling radiation from cirrus clouds in the water vapor rotational band (18 - 28 micrometers ) were made from the NCAR King Air Research Aircraft. The instrument, the SSH-2, is a 17 channel passive radiometer with seven channels spanning this spectral region. Measurements were made under a variety of atmospheric conditions ranging from clear to opaque multi-layered cloud systems. In this paper, two King Air flights were examined: one under clear conditions and one during a cirrus event. Calibration of the instrument was completed for each flight and the relative difference between measurements during the two cases are presented. The latter case included flight tracks below and through the cirrus clouds. It is clear from the measurements that a significant difference exists between the measurements during the cirrus event and under clear skies. Based upon model estimations these differences may be used to determine certain microphysical properties of the cirrus cloud.