The abundance profile of CO in Neptune's atmosphere

Details The abundance profile of CO in Neptune's atmosphere The abundance profile of CO in Neptune's atmosphere

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007icar..186..342h&link_type=abstract

Icarus, Volume 186, Issue 2, p. 342-353.

Computer Science

8

Scientific paper

The J = 3-2 rotational line of CO in Neptune has been measured using the heterodyne receiver B3 at the JCMT. The spectral resolution was 1.25 MHz and 25 tunings were used to cover a frequency range of almost 20 GHz. The measured line shape, encompassing both the broad absorption feature arising in the lower atmosphere and a narrow emission core from the upper stratosphere, indicates that the CO mole ratio is not uniform with altitude, with best-fit values of 2.2-0.4+0.6×10-6 in the upper stratosphere and 0.6±0.4×10-6 in the lower stratosphere and troposphere. The higher stratospheric abundance indicates that a dual, internal and external, origin of CO is most likely.

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