Tropospheric Emission Spectrometer nadir spectral radiance comparisons

AMS Citation:
Shephard, M. W., and Coauthors, 2008: Tropospheric Emission Spectrometer nadir spectral radiance comparisons. Journal of Geophysical Research-Atmospheres, 113, D15S05, doi:10.1029/2007JD008856.
Date:2008-04-22
Resource Type:article
Title:Tropospheric Emission Spectrometer nadir spectral radiance comparisons
Abstract: The fundamental measurement of the Tropospheric Emission Spectrometer (TES) on board the Aura spacecraft is upwelling infrared spectral radiances. Accurate TES retrievals of surface and atmospheric parameters such as trace gas amounts critically depend on well-calibrated radiance spectra. On-orbit TES nadir observations were evaluated using carefully selected, nearly coincident spectral radiance measurements from Atmospheric Infrared Sounder (AIRS) on Aqua and special scanning high-resolution interferometer sounder (SHIS) underflights. Modifications to the L1B calibration algorithms for TES version 2 data resulted in significant improvements for the TES-AIRS comparisons. The comparison of TES with SHIS (adjusted for geometric differences) show mean and standard deviation differences of less than 0.3 K at warmer brightness temperatures of 290-295 K. The TES/SHIS differences are less than 0.4 K at brightness temperatures of 265-270 K. There are larger TES/SHIS comparison differences for higher-frequency TES 1A1 filter, which has less upwelling radiance signal. The TES/AIRS comparisons show mean differences of less than 0.3 K at 290-295 K and less than 0.5 K at 265-270 K with standard deviation less than 0.6 K for the majority of the spectral regions and brightness temperature range. A procedure to warm up the optical bench for better alignment in December 2005 gave a fourfold increase in the signal-to-noise ratio at higher frequency ranges. Recent results from a long-term comparison of TES sea surface temperature (SST) observations with the Reynolds optimally interpolated (ROI) SST product demonstrates TES radiometric stability.
Subject(s):Instruments and techniques, Radiation, Transmission and scattering, Remote sensing
Peer Review:Refereed
Copyright Information:An edited version of this paper was published by AGU. Copyright 2008 American Geophysical Union.
OpenSky citable URL: ark:/85065/d7dr2vqz
Publisher's Version: 10.1029/2007JD008856
Author(s):
  • Mark Shephard
  • Helen Worden - NCAR/UCAR
  • Karen Cady-Pereira
  • Michael Lampel
  • Mingzhao Luo
  • Kevin Bowman - NCAR/UCAR
  • Edwin Sarkissian
  • Reinhard Beer
  • David Rider
  • David Tobin
  • Henry Revercomb
  • Brendan Fisher
  • Denis Tremblay
  • Shepard Clough
  • Gregory Osterman
  • Michael Gunson
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