Search for spatial variation in the jovian 15N/14N ratio from Cassini/CIRS observations

Details Search for spatial variation in the jovian 15N/14N ratio from Cassini/CIRS observations Search for spatial variation in the jovian 15N/14N ratio from Cassini/CIRS observations

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004icar..172...50f&link_type=abstract

Icarus, Volume 172, Issue 1, p. 50-58.

Astronomy and Astrophysics

Astrophysics

22

Atmospheres, Composition, Atmosphere

Scientific paper

We have used the spectra obtained by the Composite Infrared Spectrometer (CIRS) onboard the Cassini spacecraft to search for latitudinal variation in the 15N/14N ratio on Jupiter. We found no variations statistically significant given the observational and model uncertainties. The absence of latitudinal variations demonstrates that 15NH3 is not fractionated in Jupiter's atmosphere, and that the measured 15N/14N represents Jupiter's global value. Our mean value for the global jovian 15N/14N ratio of (2.22+/-0.52)×10-3 agrees with previous measurements made by Fouchet et al. (2000, Icarus 143, 223-243) and Owen et al. (2001, Astrophys. J. 553, L77-L79). We argue that the jovian isotopic 15N/14N ratio must represent the solar nitrogen isotopic composition. The solar 15N/14N ratio hence significantly differs from the terrestrial value: (15N/14N)⊕=3.68×10-3. This supports the proposition that terrestrial nitrogen originates from a nitrogen reservoir isolated from the main nitrogen reservoir in the proto-solar nebula. The origin and carrier of this isolated reservoir are still unknown.

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