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  About SAGE II

SAGE II (Stratospheric Aerosol and Gas Experiment II) was launched aboard the Earth Radiation Budget Satellite (ERBS) in October 1984. During each sunrise and sunset encountered by the orbiting spacecraft, the instrument used the solar occultation technique to measure stratospheric aerosols, ozone, nitrogen dioxide, and water vapor.

SAGE II continued the SAGE measurements of stratospheric ozone from 1984-2005. This long-term, stable data set has proven invaluable in determining trends in ozone.

Data from SAGE II, in conjunction with data from sister instruments SAM II and SAGE I, can be used to estimate long-term constituent trends and identify responses to episodic events such as volcanic eruptions.

The data SAGE II collected was integral to confirming human-driven changes to ozone, and thus contributed to the 1987 Montreal Protocol that banned certain harmful chemicals. SAGE II also saw that ozone stopped decreasing in response to this action.

Major results from SAGE II include illustrations of the stratospheric impact of the 1991 Mount Pinatubo eruption, identification of a negative global trend in lower stratospheric ozone during the 1980s, and quantitative verification of the positive water vapor feedback in current climate models.

The constituent record provided by SAGE II was continued and improved by its successor SAGE III-Meteor-3M, which was successfully launched onboard a Russian spacecraft on December 10, 2001, and will be further extended by SAGE III on ISS which is scheduled for launch in March 2015.

SAGE 2 instrument image SAGE II Instrument

Relevant Links

+ SAGE II Fact Sheet
+ NASA Vision Earth Feature Article

Access SAGE II Data

+ Policies Concerning the Use of SAGE II Data
+ Version 7.0 Data Access

SAGE II Mission Status

After nearly 21 years, the SAGE II Instrument on the ERBS platform was powered off on 22 August, 2005.

Data span: 24 October 1984 to 22 August 2005.

SAGE III is the succeeding mission in the progression of SAGE programs.

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