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Proceedings Paper

Validation studies using NAST-I measurements from recent field campaigns
Author(s): Allen M. Larar; William L. Smith; Daniel K. Zhou; Stephen Mango
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Paper Abstract

The Integrated Program Office (IPO) developed and supports high-altitude aircraft flights of the National Polar-orbiting Operational Environmental Satellite System (NPOESS) Airborne Sounding Testbed (NAST) as part of risk mitigation activities for future NPOESS sensors. The NAST-Interferometer (NAST-I) is a high spectral and spatial resolution (0.25 cm-1 and 0.13 km nadir footprint per km of aircraft altitude, respectively) cross-track scanning (2 km swath width per km of altitude) Fourier Transform Spectrometer (FTS) observing within the 3.7 - 15.5 micron spectral range. NAST-I infrared spectral radiances are used to characterize atmospheric thermal and moisture structure and provide information on radiatively active trace gases (e.g. O3 & CO) observed during flights. These direct and derived NAST-I data products greatly contribute toward instrument and forward model pre-launch specification optimization and will enhance post-launch calibration/validation activities for the Cross-track Infrared Sounder, CrIS, to fly on NPP and NPOESS (as well as for other advanced atmospheric spaceborne sensors). In this paper we address some of the challenges associated with validating infrared spectral radiances obtained from such high spectral resolution remote sensing systems. This will include comparison of NAST-I infrared spectral radiances measured during recent field experiment campaigns with other radiance measurements as well as radiance calculations performed using Line-by-Line (LBL) forward radiative transfer model based on independent, nearly-coincident observations of atmospheric state.

Paper Details

Date Published: 3 November 2003
PDF: 11 pages
Proc. SPIE 5157, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research V, (3 November 2003); doi: 10.1117/12.509259
Show Author Affiliations
Allen M. Larar, NASA Langley Research Ctr. (United States)
William L. Smith, NASA Langley Research Ctr. (United States)
Daniel K. Zhou, NASA Langley Research Ctr. (United States)
Stephen Mango, NPOESS Integrated Program Office (United States)

Published in SPIE Proceedings Vol. 5157:
Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research V
Allen M. Larar; Joseph A. Shaw; Zhaobo Sun, Editor(s)

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