Publication


L. Rezac, et al.
Validation of the global distribution of CO2 volume mixing ratio in the mesosphere and lower thermosphere from SABER
Journal of Geophysical Research: Atmospheres, 120(23), 12,067-12,081, 2015; doi: 10.1002/2015JD023955
CO2 O13CO O13C18O OC18O OC17O Evolution of the atmosphere Thermosphere General circulation Remote sensing Middle atmosphere dynamics CO2 validation SABER retrieval
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Abstract


The Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) instrument on board the Thermosphere Ionosphere Mesosphere Energetics and Dynamics satellite has been measuring the limb radiance in 10 broadband infrared channels over the altitude range from ~ 400 km to the Earth's surface since 2002. The kinetic temperatures and CO2 volume mixing ratios (VMRs) in the mesosphere and lower thermosphere have been simultaneously retrieved using SABER limb radiances at 15 and 4.3 µm under nonlocal thermodynamic equilibrium (non-LTE) conditions. This paper presents results of a validation study of the SABER CO2 VMRs obtained with a two-channel, self-consistent temperature/CO2 retrieval algorithm. Results are based on comparisons with coincident CO2 measurements made by the Atmospheric Chemistry Experiment Fourier transform spectrometer (ACE-FTS) and simulations using the Specified Dynamics version of the Whole Atmosphere Community Climate Model (SD-WACCM). The SABER CO2 VMRs are in agreement with ACE-FTS observations within reported systematic uncertainties from 65 to 110 km. The annual average SABER CO2 VMR falls off from a well-mixed value above ~80 km. Latitudinal and seasonal variations of CO2 VMRs are substantial. SABER observations and the SD-WACCM simulations are in overall agreement for CO2 seasonal variations, as well as global distributions in the mesosphere and lower thermosphere. Not surprisingly, the CO2 seasonal variation is shown to be driven by the general circulation, converging in the summer polar mesopause region and diverging in the winter polar mesopause region.

Reference


@article{JGRD:JGRD52621,
  author = "L. Rezac and Y. Jian and J. Yue and J. M. Russell and A. Kutepov and R. Garcia and K. Walker and P. Bernath",
  title = "Validation of the global distribution of CO2 volume mixing ratio in the mesosphere and lower thermosphere from SABER",
  year = 2015,
  journal = "Journal of Geophysical Research: Atmospheres",
  volume = 120,
  number = 23,
  pages = "12,067-12,081",
  month = "Dec",
  keywords = "CO2, O13CO, O13C18O, OC18O, OC17O, Evolution of the atmosphere, Thermosphere, General circulation, Remote sensing, Middle atmosphere dynamics, CO2, validation, SABER, retrieval",
  doi = "10.1002/2015JD023955",
  url = "http://dx.doi.org/10.1002/2015JD023955"
}
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