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

[摘要] CO vertical profiles have been retrieved from solarabsorption 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 establishedby an information content analysis and an estimation of the error budgets. Apartial validation of the profiles has been performed through comparisons with correlative measurements. The average volume mixing ratios (vmr) in the3 km layer above the station have been compared with coincident surface measurements. The agreement between monthly means from both measurementtechniques is very good, with a correlation coefficient of 0.87, and no significant bias observed. The FTIR total columns have also been compared toCO partial columns above 3580 m a.s.l. derived from the MOPITT (Measurement OfPollution In The Troposphere) instrument for the period March 2000 to May 2001. Relative to the FTIR columns, the MOPITT partial columns exhibit apositive bias of 8±8% for daytime and of 4±7% for nighttime measurements.

[学科分类] 大气科学