Ground-based FTIR measurements of CO from the Jungfraujoch: characterisation and comparison with in situ surface andMOPITT data

Brice Barret (1) , M. de Mazière (1) , E. Mahieu (2)

1 BIRA-IASB - Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique
2 Institut d'Astrophysique et de Géophysique [Liège]

CO vertical profiles have been retrieved from solar absorption FTIR spectra recorded at the NDSC station of the Jungfraujoch (46.5° N, 8° 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.

Domaines: Océan, Atmosphère

Brice Barret, M. de Mazière, E. Mahieu. Ground-based FTIR measurements of CO from the Jungfraujoch: characterisation and comparison with in situ surface andMOPITT data. Atmospheric Chemistry and Physics Discussions, 2003, 3 (5), pp.4857-4878. ⟨hal-00301254⟩