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Kinetic temperature and carbon dioxide from broadband infrared limb emission measurements taken from the TIMED/SABER instrument |
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| Authors: | Christopher J Mertens James M Russell III Martin G Mlynczak Chiao-Yao She Francis J Schmidlin Richard A Goldberg Manuel López-Puertas Peter P Wintersteiner Richard H Picard Jeremy R Winick Xiaojing Xu |
| Institution: | 1. NASA Langley Research Center, 21 Langley Blvd., MS 401B, Hampton, VA 23681-2199, USA;2. Hampton University, 23 Tyler Street, Hampton, VA 23668, USA;3. NASA Langley Research Center, 21 Langley Blvd., MS 420, Hampton, VA 23681-2199, USA;4. Colorado State University, 200 West Lake Street, Fort Collions, CO 80523-1875, USA;5. NASA Wallops Flight Facility, Code 972, Wallops Island, VA 23337, USA;6. NASA Goddard Space Flight Center, Code 690.4, Greenbelt, MD 20771, USA;g Instituto de Astrofisica de Andalucia, CSIC, Apdo. 3004, Granada 18080, Spain;h ARCON Corporation, 260 Bear Hill Road, Waltham, MA 02451, USA;i Air Force Research Laboratories, Hanscom Air Force Base, Hanscom, MA 01731-3010, USA;j SSAI, Inc., 1 Enterprise Parkway, Hampton, VA 23666, USA |
| Abstract: | The Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) experiment is one of four instruments on NASA’s Thermosphere–Ionosphere–Energetics and Dynamics (TIMED) satellite. SABER measures broadband infrared limb emission and derives vertical profiles of kinetic temperature (Tk) from the lower stratosphere to approximately 120 km, and vertical profiles of carbon dioxide (CO2) volume mixing ratio (vmr) from approximately 70 km to 120 km. In this paper we report on SABER Tk/CO2 data in the mesosphere and lower thermosphere (MLT) region from the version 1.06 dataset. The continuous SABER measurements provide an excellent dataset to understand the evolution and mechanisms responsible for the global two-level structure of the mesopause altitude. SABER MLT Tk comparisons with ground-based sodium lidar and rocket falling sphere Tk measurements are generally in good agreement. However, SABER CO2 data differs significantly from TIME-GCM model simulations. Indirect CO2 validation through SABER-lidar MLT Tk comparisons and SABER-radiation transfer comparisons of nighttime 4.3 μm limb emission suggest the SABER-derived CO2 data is a better representation of the true atmospheric MLT CO2 abundance compared to model simulations of CO2 vmr. |
| Keywords: | SABER Temperature Carbon dioxide (CO2) Infrared remote sensing Non-LTE |
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