Network For the Detection of Atmospheric Composition Change (NDACC)
	University of Denver

The purpose of this program is to measure important trace gases using an Infrared (IR) absorption spectrum. Automated observations of solar IR spectra using a FTIR spectrometer are conducted daily from Monday to Friday. Ozone and other stratospheric chemicals (such as Nitric Acid - HNO3, Hydrogen Chloride - HCL, etc.) are measured in parts-per-million (ppm) as a function of altitude & total column amount.

A computer-automated system observes the solar infrared spectra using a Fourier Transform Infrared Spectrometer (FTIR). FTIR Spectroscopy looks at molecular absorptions in direct sunlight. These measurements occur 5 times per week at MLO.

Primarily in order to monitor the chemistry of the stratosphere. Looking at Ozone depleting compounds, greenhouse gas & pollutant transport.

Chlorofluorocarbons (CFC’s) are stabilizing. Pollutant transportation of biomass burning in China is being monitored.

This project is part of the international NDACC network, which monitors the upper atmosphere & provides baseline data on its health & information to modelers.