Cirrus effects in the Halogen Occultation Experiment (HALOE) are investigat
ed and methods are developed to use HALOE multiwavelength particulate extin
ction measurements for cloud identification. Techniques were explored to id
entify cloud layers from the extinction spectrum, vertical gradient, and ma
gnitude. Results from HALOE measurements are presented, including cirrus cl
imatologies and comparisons of cloud top height with independent measuremen
ts.