Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p33a1434t&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P33A-1434
Physics
0343 Planetary Atmospheres (5210, 5405, 5704), 0365 Troposphere: Composition And Chemistry, 3346 Planetary Meteorology (5445, 5739), 3360 Remote Sensing, 6295 Venus
Scientific paper
The two and a half years of data accumulated by Venus Express since April 2006 have led to an improved understanding of the bulk global cloud layer and the deep atmosphere composition and dynamics on Venus. In particular, global maps of tropospheric CO retrieved at the 2.32 micron 2-0 band by the VIRTIS spectrometer reveal details of the latitudinal extent of the Hadley circulation, and previously unseen diurnal variability. An optimal estimation spectral fitting algorithm is used to retrieve a global map of CO at 35km, which shows an equator-to-pole increase from 23 to 32 ppm with an uncertainty of 2 ppm. A faster band-ratio technique yields a very similar estimate of the abundance of CO and can be applied to a much larger data set, allowing meridional and temporal variability to be examined. The subsequent analysis of 1450 VIRTIS image cubes reveals more complex features in the tropospheric CO distribution, bringing a new perspective on the meteorology of the lower atmosphere.
Irwin Patrick G.
Taylor Fred W.
Tsang Constantine C. C.
Wilson Colin Frank
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