Hcn

(1.0 ± 0.3) x 10~9 (0.003-30 mbar), confined to stratosphere

(3.2 ± 1.5) x 10~10 at 2mbar, approx. constant with height, condenses at 3 mbar 1.5 x 10~9 at p < 0.3 mbar, decreasing at lower altitudes

Ground-based 1-1.3 mm

Ground-based 1 mm Ground-based 1.1 mm Ground-based 1 mm

Rosenqvist et al. (1992) Marten et al. (1993)

Lellouch et al. (1994)

Marten et al. (2005)

n2

<0.6% <0.7%

Voyager far-IR ISO SWS/LWS

Conrath et al. (1993) Burgdorf et al. (2003)

C2H6

1.5 x 10~6 (stratosphere) (0.2-1.2) x 10~6 (stratosphere)

Voyager mid-IR Ground-based mid-IR

Bezard and Romani (1991)

Orton et al. (1992)

C2H2

6 x 10 ~8 (stratosphere) (0.6-7.1) x 10~8 (stratosphere)

Voyager mid-IR Ground-based mid-IR

Bezard and Romani (1991)

Orton et al. (1992)

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