Calibration of a ground-based technique to measure water on Jupiter using Galileo/NIMS data

Details Calibration of a ground-based technique to measure water on Jupiter using Galileo/NIMS data Calibration of a ground-based technique to measure water on Jupiter using Galileo/NIMS data

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dps....32.1213b&link_type=abstract

American Astronomical Society, DPS Meeting #32, #12.13; Bulletin of the American Astronomical Society, Vol. 32, p.1014

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The CSHELL spectrometer at NASA's Infrared Telescope Facility was used in December 1996 to observe Jupiter at nearly the same time as Galileo/NIMS observations of a hot spot in the North Equatorial Belt (NEB). CSHELL spectra of CH4 at 5.18 microns and NIMS spectra of H2O between 4.6 and 5.2 microns sound the 3-8 bar region in Jupiter's deep troposphere. CSHELL's 1-arcsec -wide slit was aligned east-west on Jupiter and stepped from north to south across the NEB. Radiative transfer models indicate that the strength of the CH4 feature at 5.18 microns is anti-correlated with gaseous H2O between 3 and 6 bars. The CH4 feature is predicted to be very strong for H2O abundances less than 10ppm and it should vanish when H2O > 300ppm. Roos-Serote et al (JGR 103, 23023, 1998) retrieved a relative humidity of 0.2 of the targeted hot spot (E4FEA). When convolved to the 3800km CSHELL resolution this becomes 0.5 bars. We used the NIMS-derived H2O abundance in the hot spot to calibrate the ground-based technique. Once calibrated, the CH4 absorption feature may in turn be used to map the abundance of water in regions that Galileo/NIMS did not observe.

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