کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1774264 | 1021160 | 2010 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: 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](/preview/png/1774264.png)
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.
Journal: Icarus - Volume 207, Issue 2, June 2010, Pages 558–563