CEDAR email: New SABER Night Atomic Oxygen Data

[Mlynczak, Martin G. (LARC-E302)]

Dear colleagues

            We would like to announce the release of a new version of night time atomic oxygen derived from measurements made by the SABER instrument on the NASA TIMED satellite. The atomic oxygen concentrations are derived from measurements of the volume emission rates of the v=9 and 8 states of the highly vibrationally excited OH radical. The new dataset is derived from an updated kinetic model of OH(v) originally described by Mlynczak et al. [2013a]. Rate coefficients in the model have been adjusted to account for the recently discovered large quenching rates of highly vibrationally excited OH by atomic oxygen [Sharma et al., 2015]. The new atomic oxygen profiles are approximately 25% smaller (global average) than reported in Mlynczak et al. [2013a], but retain all of the spatial and temporal variability described by Smith et al. [2010]. The new atomic oxygen profiles also yield a much more physically realistic global annual mean energy budget than the original version and the new profile values lie between the radiatively allowed global annual maximum and minimum atomic oxygen profiles described by Mlynczak et al. [2013b, c]. The new dataset and changes to the model from which it is generated will be described in a forthcoming publication, which will also describe the consequences of the new O-atom data for SABER day and night ozone and for SABER atomic hydrogen. The data (all 15.5 years to date) are accessible at the SABER data website at https://www.gats-inc.com<https://www.gats-inc.com/>.

Marty Mlynczak and Jim Russell

Mlynczak, M. G., et al., (2013c), Radiative constraints on the minimum atomic oxygen concentration in the mesopause region, Geophys Res. Lett., 40, 3777–3780, doi:10.1002/grl.50725.

Mlynczak, M. G., et al., (2013b), Radiative and energetic constraints on the global annual mean atomic oxygen concentration in the mesopause region, J. Geophys. Res., DOI: 10.1002/jgrd.50400.

Mlynczak, M. G. et al., (2013a), Atomic oxygen in the mesosphere and lower thermosphere derived from SABER: Algorithm theoretical basis and measurement uncertainty, J. Geophys. Res., DOI: 10.1002/jgrd.50401.

Sharma, R. D., P. P. Wintersteiner, and K. S. Kalogerakis (2015), A new mechanism for OH vibrational relaxation leading to enhanced CO2 emissions in the nocturnal mesosphere. Geophys. Res. Lett., 42, 4639–4647. doi: 10.1002/2015GL063724<http://dx.doi.org/10.1002/2015GL063724>.

Smith, A., K., D. R. Marsh, M. G. Mlynczak, and J. C. Mast, Temporal variations of atomic oxygen in the upper mesosphere from SABER, J. Geophys. Res., 115, D18309, doi:10.1029/2009JD013434, 2010


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