SABER Observations of Polar Summer/Winter Mesospheric and Lower Thermospheric Temperatures and Comparisons With Correlative Measurements Taken During the MaCWAVE Campaign

Details SABER Observations of Polar Summer/Winter Mesospheric and Lower Thermospheric Temperatures and Comparisons With Correlative Measurements Taken During the MaCWAVE Campaign SABER Observations of Polar Summer/Winter Mesospheric and Lower Thermospheric Temperatures and Comparisons With Correlative Measurements Taken During the MaCWAVE Campaign

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa41b0439r&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SA41B-0439

Computer Science

Sound

0340 Middle Atmosphere: Composition And Chemistry, 0350 Pressure, Density, And Temperature, 0360 Transmission And Scattering Of Radiation, 0394 Instruments And Techniques, 3360 Remote Sensing

Scientific paper

The Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) experiment was launched onboard the TIMED satellite in December 2001. SABER derives kinetic temperature (Tk) in the mesosphere and lower thermosphere (MLT) from broadband measurements of CO2 15 um limb emission, in combination with measurements of CO2 4.3 um limb emission used to derive CO2 volume mixing ratio. Infrared emissions from the CO2 ro-vibrational bands are in non-local thermodynamic equilibrium (non-LTE) in the MLT, requiring non-LTE processes to be accurately modeled in the retrieval algorithm. In this paper we focus on Tk and show results derived from the non-LTE retrieval algorithm. We demonstrate the ability to retrieve Tk in an extreme non-LTE environment by comparing SABER MLT Tk with rocket falling sphere (FS) and sodium lidar measurements taken during the 2002 summer MaCWAVE campaign. The summer Tk profiles show that the SABER non-LTE retrieval algorithm improves upper mesospheric Tk retrievals by 35 K to 45 K, as compared to SABER LTE Tk retrievals. Combined measurements from SABER and MaCWAVE show a mesopause region that is highly variable in space and time. SABER data also show a mesopause altitude that changes with latitude and season, consistent with the bimodal character of the mesopause height. We also show preliminary comparisons with the recently available FS and sodium lidar measurements taken during the 2003 winter MaCWAVE campaign.

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