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Fourier Transform Infrared Spectrometer (FTIR)

Status

Operated By: 
PI

The absorption of infrared solar radiation along a slant path to the sun is recorded from 2 to 15 micrometers. Six spectral filters are used to cover the region from 2-15 microns. An interferogram is recorded in about 10 seconds. Interferograms are transformed to produce spectra. Column amounts are retrieved by fitting the observed spectra using the non-linear least squares fitting code SFIT2 that employs an Optimal Estimation retrieval algorithm.

The major chlorine reservoirs (HCl and ClONO2), the important nitrogen-containing gases in the stratosphere (N2O, NO, NO2, and HNO3), stratospheric and tropospheric tracers (HF, CH4, C2H6, H2O, CO2), a major source CFC (CF2Cl2) and ozone may be routinely retrieved.

Instrument Type: 
Spectrometer
Measurements: 
HCl, ClONO2, N2O, NO, NO2, HNO3, HF, CH4, C2H6, H2O, CO2, CF2Cl2, O3
Aircraft: 
DC-8 - AFRC
Point(s) of Contact: 
Michael Coffey (POC; PI)