Accession Number:

ADA439211

Title:

Retrieval of Kinetic Temperature and Carbon Dioxide Abundance From Non-Local Thermodynamic Equilibrium Limb Emission Measurements Made by the SABER Experiment on the TIMED Satellite

Descriptive Note:

Corporate Author:

AIR FORCE RESEARCH LAB HANSCOM AFB MA SPACE VEHICLES DIRECTORATE

Report Date:

2003-01-01

Pagination or Media Count:

11.0

Abstract:

The Sounding of the Atmosphere using Broadband Emission Radiometry SABER experiment was launched onboard the TIMED satellite in December, 2001. SABER is designed to provide measurements of temperature, constituents, and the key radiative and chemical sources and sinks of energy in the mesosphere and lower thermosphere MLT. SABER measures Earth limb emission in 10 broadband radiometer channels ranging from 1.27 micrometers to 17 micrometers. Measurements are made both day and night over the latitude range from 52 deg 5 to 83 deg N with alternating hemisphere coverage every 60 days. In this paper we concentrate on retrieved profiles of kinetic temperature Tk and CO2 volume mixing ratio vmr, inferred from observed 15 micrometers and 4.3 micrometers limb emissions. SABER-measured limb radiances are in non-local thermodynarnic equilibriurn non-LTE in the MLT region. The complexity of non-LTE radiation transfer combined with the large volume of data measured by SABER requires mew retrieval approaches and radiative transfer techniques to accurately and efficiently retrieve the data products. In this paper we present the salient features of the coupled non-LTE Tk CO2 retrieval algorithm, along with preliminary results.

Subject Categories:

  • Atmospheric Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE