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Stratospheric Aerosol and Gas Experiment II (SAGE II): species profiles, version 6.20

Update Frequency: Not Planned
Status: Completed
Online Status: ONLINE
Publication State: Published
Publication Date: 2007-01-08
Download Stats: last 12 months


Species profiles (SPEC files) and revision information (INDEX) from the Stratospheric Aerosol and Gas Experiment II (SAGE II), an instrument on board the Earth Radiation Budget Satellite (ERBS) which used the solar occultation technique to measure global profiles of aerosol extinction, temperature, ozone, nitrogen dioxide and water vapour in the stratosphere and upper troposphere. Version 1 of the data consist of monthly mean global image maps and associated gridded data for the period 1985-1993. Version 6.2, available for the period October 1984 to August 2005, superseded version 6.1 , containing INDEX and SPEC files for the period October 1984 to July 2000. Access to this dataset is partially restricted.

Species information includes aerosol extinction profiles at 1020, 525, 453, and 385 nanometers, number density profiles of ozone and nitrogen dioxide, plus molecular density and mixing ratio profiles of water vapour. It also includes aerosol surface area density and effective radius profiles, and retrieved molecular density for the middle atmosphere (40-75 km). All profiles are at 0.5-km vertical resolution. These products are nearly global in coverage, with data spanning from 80 North to 80 South.

Citable as:  National Aeronautics and Space Administration; McCormick, M.P.; Thomasson, L. (2007): Stratospheric Aerosol and Gas Experiment II (SAGE II): species profiles, version 6.20. NCAS British Atmospheric Data Centre, date of citation.
Abbreviation: Not defined
Keywords: SAGE II, occultation, profiles, chemistry, temperature, ozone


Previous Info:
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Access rules:
Restricted data: please submit an application using the REQUEST ACCESS link for access.
Use of these data is covered by the following licence: When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

Data obtained by the SAGE II (Stratospheric Aerosol and Gas Experiment II) sensor on-board the Earth Radiation Budget Satellite (ERBS), an supplied to the BADC where they are stored.

File Format:
The files are unformatted (native format) binary files written on a DEC Alpha by a program compiled using the DIGITAL Fortran 90 V5.2-705 compiler. The data consists of two and four byte little endian integers and single and double precision little endian IEEE floating point data. Refer to the linked documentation and software provided to read these data.

Process overview

This dataset was generated by a combination of instruments deployed on platforms and computations as detailed below.

Mobile platform operations

Mobile Platform Operation 1 Mobile Platform Operation for: Earth Radiation Budget Satellite (ERBS)

Computation Element: 1

Title Stratospheric Aerosol and Gas Experiment II (SAGE II): species profiles, version 6.20
Abstract This computation involved: deployed on Earth Radiation Budget Satellite (ERBS). Version 1 contained SAGE II monthly mean global colour image maps and the relevant gridded data for aerosol extinction at 1020 nm, 525 nm, 453 nm and 385 nm wavelength, ozone mixing ratio, water vapour mixing ratio and relative humidity, nitrogen dioxide mixing ratio at up 14 pressure levels, for the period January 1985 to December 1993. As the original SAGE II measurements were made at geometrical heights, meteorological data from the National Meteorological Center (NMC) were used to determine the actual pressure heights for the SAGE II profile data and also have been used to calculate the relative humidity. For easy reference, the NMC atmospheric temperature, geometrical altitude and tropopause data used in the determination of SAGE II data are also included. Users of the image/data version 1.0 products need to be aware that these meteorological data are not measured by the SAGE II instrument itself.
Input Description None
Output Description None
Software Reference None
Output Description None

No variables found.

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