Preliminary results for the 5-20 cm wavelength opacity of ammonia pressure broadened by water vapor under jovian conditions

Details Preliminary results for the 5-20 cm wavelength opacity of ammonia pressure broadened by water vapor under jovian conditions Preliminary results for the 5-20 cm wavelength opacity of ammonia pressure broadened by water vapor under jovian conditions

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..717d&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.717

Physics

Scientific paper

At least one laboratory measurement study indicates that water vapor can efficiently broaden the 572 GHz rotational transition of ammonia [1], and this could be true for the inversion transitions of ammonia as well. Water vapor is the fourth most abundant constituent deep in the atmospheres of the jovian planets after hydrogen, helium, and methane [2]. While the broadening effects of the first three constituents on the ammonia absorption spectrum are now well characterized, it is critical to investigate any possible pressure broadening effects of water vapor on the ammonia absorption spectrum. Experimental investigation of the pressure broadening of the inversion lines of ammonia by water vapor in the microwave region is currently being performed. Over 500 measurements of the microwave properties of ammonia broadened by water vapor in a hydrogen/helium atmosphere have been conducted at pressures up to 100 bars and temperatures in the 375- 500 K range. On the basis of the data obtained in this work, an empirical estimation of the broadening of ammonia by water vapor has been obtained. These measurements will directly aid in the accurate interpretation of the observed microwave emission spectra of the jovian planets, and also improve retrievals of the atmospheric abundance of water vapor at Jupiter from the Juno microwave radiometer (MWR) measurements.

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