Abstract

Abstract. This paper details the SAGE (Stratospheric Aerosol and Gas Experiment) version 7.0 algorithm and how it is applied to SAGE II. Changes made between the previous (v6.2) and current (v7.0) versions are described and their impacts on the data products explained for both coincident event comparisons and time-series analysis. Users of the data will notice a general improvement in all of the SAGE II data products, which are now in better agreement with more modern data sets (e.g., SAGE III) and more robust for use with trend studies.

Highlights

  • The Stratospheric Aerosol and Gas Experiments (SAGE I, II, III/METEOR-3M, and III/ISS) are an ongoing series of satellite-based solar occultation instruments spanning over twenty-six years

  • This paper provides an overview of the instrument operation and algorithm, followed by a detailed description of each step of the processing algorithm and how it is applied to SAGE II, including differences between the previous (v6.2) and current (v7.0) versions

  • SAGE II operated on board the Earth Radiation Budget Satellite (ERBS) from its launch in October 1984 until its retirement in August 2005

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Summary

Introduction

The Stratospheric Aerosol and Gas Experiments (SAGE I, II, III/METEOR-3M, and III/ISS) are an ongoing series of satellite-based solar occultation instruments spanning over twenty-six years. This paper describes the first standard algorithm to process SAGE data, SAGE version 7 (v7.0). The basis of the version 7.0 algorithm derives primarily from the SAGE III/M3M version 4.0 algorithm and is intended to form the basis for the reprocessing of all members of the SAGE series, including the Stratospheric Aerosol Measurement (SAM II) instrument. This paper provides an overview of the instrument operation and algorithm, followed by a detailed description of each step of the processing algorithm and how it is applied to SAGE II, including differences between the previous (v6.2) and current (v7.0) versions

Instrument operation
Algorithm overview
Preprocessing
Ephemeris
Meteorology
Refraction
Spectroscopy
Transmission
Edges and pointing
I zero
Other corrections
Mirror calibration
Edge-time refinement
Vertical profiles of individual species
Basic procedures
Species separation
Inversion
Event comparisons
Time series analysis
Findings
Conclusions
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