A semisimultaneous inversion algorithm for SAGE III

Research output: Contribution to journalArticle

Abstract

The Stratospheric Aerosol and Gas Experiment (SAGE) III instrument was successfully launched into orbit on 10 December 2001. The planned operational species separation inversion algorithm will utilize a stepwise retrieval strategy. This paper presents an alternative, semisimultaneous species separation inversion that simultaneously retrieves all species over user-specified vertical intervals or blocks. By overlapping these vertical blocks, retrieved species profiles over the entire vertical range of the measurements are obtained. The semisimultaneous retrieval approach provides a more straightforward method for evaluating the error coupling that occurs among the retrieved profiles due to various types of input uncertainty. Simulation results are presented to show how the semisimultaneous inversion can enhance understanding of the SAGE III retrieval process. In the future, the semisimultaneous inversion algorithm will be used to help evaluate the results and performance of the operational inversion. Compared to SAGE II, SAGE III will provide expanded and more precise spectral measurements. This alone is shown to significantly reduce the uncertainties in the retrieved ozone, nitrogen dioxide, and aerosol extinction profiles for SAGE III. Additionally, the well-documented concern that SAGE II retrievals are biased by the level of volcanic aerosol is greatly alleviated for SAGE III.

Original languageEnglish (US)
Article number4811
JournalJournal of Geophysical Research: Space Physics
Volume107
Issue number24
DOIs
StatePublished - 2002

Fingerprint

Upper atmosphere
Aerosols
aerosols
Gases
inversions
aerosol
gases
gas
retrieval
experiment
Experiments
profiles
volcanic aerosol
inversion
Nitrogen Dioxide
nitrogen dioxide
Ozone
ozone
volcanology
extinction

Keywords

  • Aerosol retrieval
  • Inverse modeling
  • Nitrogen dioxide retrieval
  • Ozone retrieval
  • Solar occultation

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Atmospheric Science
  • Astronomy and Astrophysics
  • Oceanography

Cite this

A semisimultaneous inversion algorithm for SAGE III. / Ward, Dale M.

In: Journal of Geophysical Research: Space Physics, Vol. 107, No. 24, 4811, 2002.

Research output: Contribution to journalArticle

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