Journal
ICARUS
Volume 186, Issue 2, Pages 342-353Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.icarus.2006.08.025
Keywords
abundances, atmospheres; Neptune, atmosphere; radiative transfer; spectroscopy
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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) x 10(-6) in the upper stratosphere and 0.6 +/- 0.4 x 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. (c) 2006 Elsevier Inc. All rights reserved.
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