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Journal article

Characterization of ozone profiles derived from Aura TES and OMI radiances

Fu D, Worden J, Liu X, Kulawik S, Bowman K, Natraj V ...see all

Atmospheric Chemistry and Physics, vol. 13, issue 6 (2013) pp. 3445-3462 Published by European Geosciences Union

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Abstract

We present satellite based ozone profile estimates derived by combining radiances measured at thermal infrared (TIR) wavelengths from the Aura Tropospheric Emission Spectrometer (TES) and ultraviolet (UV) wavelengths mea-sured by the Aura Ozone Monitoring Instrument (OMI). The advantage of using these combined wavelengths and instru-ments for sounding ozone over either instrument alone is im-proved sensitivity near the surface as well as the capability to consistently resolve the lower troposphere, upper tropo-sphere, and lower stratosphere for scenes with varying geo-physical states. For example, the vertical resolution of ozone estimates from either TES or OMI varies strongly by sur-face albedo and temperature. Typically, TES provides 1.6 de-grees of freedom for signal (DOFS) and OMI provides less than 1 DOFS in the troposphere. The combination provides 2 DOFS in the troposphere with approximately 0.4 DOFS for near surface ozone (surface to 700 hPa). We evaluated these new ozone profile estimates with ozonesonde measure-ments and found that calculated errors for the joint TES and OMI ozone profile estimates are in reasonable agree-ment with actual errors as derived by the root-mean-square (RMS) difference between the ozonesondes and the joint TES/OMI ozone estimates. We also used a common a pri-ori profile in the retrievals in order to evaluate the capability of different retrieval approaches on capturing near-surface ozone variability. We found that the vertical resolution of the joint TES/OMI ozone profile estimates shows signifi-cant improvements on quantifying variations in near-surface ozone with RMS differences of 49.9 % and correlation coeffi-cient of R = 0.58 for the TES/OMI near-surface estimates as compared to 67.2 % RMS difference and R = 0.33 for TES and 115.8 % RMS difference and R = 0.09 for OMI. This comparison removes the impacts of using the climatologi-cal a priori in the retrievals. However, it results in artificially large sonde/retrieval differences. The TES/OMI ozone pro-files from the production code of joint retrievals will use cli-matological a priori and therefore will have more realistic ozone estimates than those from using a common a priori volume mixing ratio profile.

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Authors

  • D. Fu

  • J. R. Worden

  • X. Liu

  • S. S. Kulawik

  • K. W. Bowman

  • V. Natraj

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