SABER observations of mesospheric temperatures and comparisons with falling sphere measurements taken during the 2002 summer MaCWAVE campaign

The SABER instrument was launched onboard the TIMED satellite in December 2001. Vertical profiles of kinetic temperature (Tk) are derived from broadband measurements of CO2 15 μm limb emission, in combination with measurements of CO2 4.3 μm limb emission used to derive CO2 volume mixing ratio (vmr). Infrared emission from the CO2 ro‐vibrational bands are in non‐local thermodynamic equilibrium (non‐LTE) in the mesosphere and lower thermosphere (MLT), requiring new radiation transfer and retrieval methods. In this paper we focus on Tk and show some of the first SABER observations of MLT Tk and compare SABER Tk profiles with rocket falling sphere (FS) measurements taken during the 2002 summer MaCWAVE campaign at Andøya, Norway (69°N, 16°E). The comparisons are very encouraging and demonstrate a significant advance in satellite remote sensing of MLT limb emission and the ability to retrieve Tk under extreme non‐LTE conditions.

[1]  Martin G. Mlynczak,et al.  Retrieval of kinetic temperature and carbon dioxide abundance from nonlocal thermodynamic equilibrium limb emission measurements made by the SABER experiment on the TIMED satellite , 2003, SPIE Remote Sensing.

[2]  James M. Russell,et al.  Retrieval of mesospheric and lower thermospheric kinetic temperature from measurements of CO2 15 µm Earth Limb Emission under non‐LTE conditions , 2001 .

[3]  Pedro Viterbo,et al.  Impact on ECMWF forecasts of changes to the albedo of the boreal forests in the presence of snow , 1999 .

[4]  Joseph J. Tansock,et al.  Overview of the SABER experiment and preliminary calibration results , 1999, Optics & Photonics.

[5]  U. Zahn,et al.  The two-level structure of the mesopause: A model study , 1999 .

[6]  Franz-Josef Lübken,et al.  Thermal structure of the Arctic summer mesosphere , 1999 .

[7]  C. Y. She,et al.  Concept of a two‐level mesopause: Support through new lidar observations , 1998 .

[8]  U. Zahn,et al.  The mesopause altitude: Only two distinctive levels worldwide? , 1996 .

[9]  L. Jeong.  Proceedings of Air Force Office of Scientific Research and Phillips Laboratory Workshop on Sprites and Blue Jets Held in Phillips Laboratory, Geophysics Directorate, Hanscom AFB, MA on 18-19 October 1995. , 1996 .

[10]  Martin G. Mlynczak,et al.  An updated model for O2(a1Δg) concentrations in the mesosphere and lower thermosphere and implications for remote sensing of ozone at 1.27 μm , 1993 .

[11]  Richard H. Picard,et al.  Line‐by‐line radiative excitation model for the non‐equilibrium atmosphere: Application to CO2 15‐μm emission , 1992 .

[12]  M. López‐Puertas,et al.  Vibrational Temperatures and Radiative Cooling of the Co2 15 Mum Bands In the Middle Atmosphere , 1992 .

[13]  H. S. Lee,et al.  The inflatable sphere: A technique for the accurate measurement of middle atmosphere temperatures , 1991 .

[14]  P. Wintersteiner,et al.  Role of carbon dioxide in cooling planetary thermospheres , 1990 .