Hemispherical distribution of CO above the Venus’ clouds by ground-based 2.3 μm spectroscopy

Details Hemispherical distribution of CO above the Venus’ clouds by ground-based 2.3 μm spectroscopy Hemispherical distribution of CO above the Venus’ clouds by ground-based 2.3 μm spectroscopy

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010icar..207..558i&link_type=abstract

Icarus, Volume 207, Issue 2, p. 558-563.

Physics

2

Scientific paper

The abundance of carbon monoxide in the Venus’ dayside atmosphere above the clouds was measured by ground-based 2.3 μm spectroscopy for 4 days. The hemispherical distributions found show no significant latitudinal or longitudinal structure. The disc-averaged mixing ratio of 58 ± 17 ppm found at a representative height of 62-67 km is consistent with previous measurements. Such a flat distribution of CO abundance above the clouds seems to be controlled by an efficient horizontal eddy diffusion with a time scale of 30 days or shorter although the CO distribution below the clouds seems to be controlled by the meridional circulation. The pole-ward wind speed of the meridional circulation above the clouds is estimated to be 0.2 m s-1 or less based on the difference between the CO mixing ratios above and below the clouds.

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