Abstract
A strong, broad spectral emission feature at 85° N latitude centered at 221 cm −1 remains unidentified after candidate ices of H 2O and pure crystalline CH 3CH 2CN are unambiguously ruled out. A much shallower weak emission feature starts at 160 cm −1 and blends into the strong feature at ∼190 cm −1. This feature is consistent with one formed by an HCN ice cloud composed of ⩽5 μm radius particles that resides in the lower stratosphere somewhere below an altitude of 160 km. Titan's stratospheric aerosol appears to have a spectral emission feature at about 148 cm −1. The aerosol abundance at 85° N is about a factor 2.2 greater than at 55° S.
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