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GACM

Global Atmospheric Composition Mission

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GACM will enable scientists to better understand the relationship between atmospheric ozone distribution and the factors that alter it.

The composition and chemistry of our atmosphere must be observed, modeled, and predicted in order to understand and mitigate potentially harmful impacts on society and ecosystems. Current satellite instruments provide critical data at low resolution. However, to obtain the more precise data needed to improve models and predictions, a new generation of instruments and observing strategies must be developed.

The suite of sensors aboard GACM will advance understanding of chemical weather processes on regional to global scales and help improve models and predictions of air pollution and ground level ultraviolet radiation. GACM includes a unique combination of passive sensors gathering data on the altitudes and concentrations of key trace gases and aerosols (airborne particles) that are related to ozone formation or that serve as tracers of pollution and airflow. These sensors include a spectrometer in the ultraviolet/visible range that will collect daytime measurements of ozone, nitrogen dioxide, sulfur dioxide, formaldehyde, and aerosols. An infrared spectrometer will sample carbon monoxide through the atmosphere by day and in the mid-troposphere at night, while an advanced microwave spectrometer will sample gases and aerosols in the upper troposphere and lower stratosphere.

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