Abundances of elements in the atmosphere of Jupiter as a ratio to that of the protosolar nebula. Jupiter data are from Mahaffy et al. (2000)  and Wong et al. (2004) . Protosolar nebula data are from Lodders et al. (2009) . Noble gases are shown in green. The mixing ratios of these elements in the protosolar nebula are derived primarily from observations of the solar photosphere and from meteorites. Determinations of the abundances of C, N, and O in the Sun have fallen in recent years, so the Jovian ratios have increased.