Ground-based FTIR measurements of CO from the Jungfraujoch: characterisation and comparison with in situ surface and MOPITT data B. Barret1, M. De Mazière1, and E. Mahieu2 1Belgian Institute for Space Aeronomy, Brussels, Belgium 2Institut de Géophysique et d’Astrophysique, Liège, Belgium
Abstract. CO vertical profiles have been retrieved from solar
absorption FTIR spectra recorded at the NDSC station of the Jungfraujoch
(46.5º N, 8º E and 3580 m a.s.l.) for the period from January 1997 to May 2001. The characterisation of these profiles has been established
by an information content analysis and an estimation of the error budgets. A
partial validation of the profiles has been performed through comparisons with correlative measurements. The average volume mixing ratios (vmr) in the
3 km layer above the station have been compared with coincident surface measurements. The agreement between monthly means from both measurement
techniques is very good, with a correlation coefficient of 0.87, and no significant bias observed. The FTIR total columns have also been compared to
CO partial columns above 3580 m a.s.l. derived from the MOPITT (Measurement Of
Pollution In The Troposphere) instrument for the period March 2000 to May 2001. Relative to the FTIR columns, the MOPITT partial columns exhibit a
positive bias of 8±8% for daytime and of 4±7% for nighttime measurements.
Citation: Barret, B., De Mazière, M., and Mahieu, E.: Ground-based FTIR measurements of CO from the Jungfraujoch: characterisation and comparison with in situ surface and MOPITT data, Atmos. Chem. Phys., 3, 2217-2223, doi:10.5194/acp-3-2217-2003, 2003.