Lidar temperature series in the middle atmosphere as a reference data set – Part 2: Assessment of temperature observations from MLS/Aura and SABER/TIMED satellites

Robin Wing 1 Alain Hauchecorne 1 Philippe Keckhut 1 Sophie Godin-Beekmann 1 Sergey Khaykin 2 Emily Mccullough 3
1 STRATO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
2 TROPO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : We have compared 1338 nights of Rayleigh lidar temperatures measured at L'Observatoire de Haute Provence (OHP) with co-located temperature measurements from the Microwave Limb Sounder (MLS) and the Sounding of the Atmosphere by Broadband Emission Radiometry instru- ment (SABER). The comparisons were conducted using data from January 2002 to January 2011 in the geographic region around the observatory (43.93° N, 5.71° E). We have found systematic differences between the temperatures measured from the ground based lidar and those measured from the satellites which suggest non-linear distortions in the satellite altitude retrievals. We see a winter stratopause cold bias in the satellite measurements with respect to the lidar (−6 K for SABER and −15 K for MLS), a summer mesospheric warm bias (10 K near 60 km), and a vertically structured bias for MLS (0 to 4 K). We have corrected the stratopause height of the satellite measurements using the lidar temperatures and have seen an improvement in the comparison. The winter stratospheric relative cold bias between the lidar and SABER has been eliminated and the summer mesospheric warm bias is reduced by 6 K. Stratopause altitude corrections have reduced the relative cold bias between the lidar and MLS by 4 K in the early autumn and late spring.
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Robin Wing, Alain Hauchecorne, Philippe Keckhut, Sophie Godin-Beekmann, Sergey Khaykin, et al.. Lidar temperature series in the middle atmosphere as a reference data set – Part 2: Assessment of temperature observations from MLS/Aura and SABER/TIMED satellites. Atmospheric Measurement Techniques, European Geosciences Union, 2018, 11 (12), pp.6703-6717. ⟨10.5194/amt-11-6703-2018⟩. ⟨insu-01784812⟩

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