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Atmospheric Trace Molecule Spectroscopy (ATMOS) Experiment Version 3 data retrievals.

Fredrick W Irion1, Michael R Gunson, Geoff C Toon

  • 1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA. bill.irion@jpl.nasa.gov

Applied Optics
|December 5, 2002
PubMed
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The Atmospheric Trace Molecule Spectroscopy (ATMOS) experiment released Version 3, enhancing trace gas profile retrievals from the upper troposphere to lower mesosphere. This update offers improved accuracy, especially for water vapor and carbon monoxide, down to 6.5 km.

Area of Science:

  • Atmospheric Science
  • Spectroscopy
  • Remote Sensing

Background:

  • The Atmospheric Trace Molecule Spectroscopy (ATMOS) experiment collected infrared solar-absorption spectra during four Space Shuttle missions.
  • Previous data versions had limitations in retrieving trace gas profiles in the upper troposphere.

Purpose of the Study:

  • To release Version 3 of the ATMOS dataset, providing improved trace and minor gas profiles.
  • To detail advancements in data processing and retrieval accuracy, particularly in the lower atmosphere.

Main Methods:

  • Utilized IR solar-absorption spectra from four Space Shuttle missions (1985-1994).
  • Implemented a new global-fitting algorithm for enhanced profile retrievals.
  • Developed a new sulfuric-acid aerosol product.

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Main Results:

  • Retrieved profiles for over 350 occultations from the upper troposphere to the lower mesosphere.
  • Achieved reliable retrievals down to 6.5 km, with notable improvements for H2O and CO.
  • Observed consistent stratospheric water results and no net H2 consumption in the upper stratosphere.
  • Introduced a new sulfuric-acid aerosol product.

Conclusions:

  • ATMOS Version 3 provides a significantly improved dataset for atmospheric trace gas research.
  • The new processing algorithm enhances retrieval reliability, extending accurate measurements to lower altitudes.
  • The dataset offers valuable insights into atmospheric composition and processes.