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Lagrangian approach for stratospheric aerosol and gas experiment (SAGE) II profile intercomparisons

: Lu, C.-H.; Yue, G.K.; Manney, G.L.; Jäger, H.; Mohnen, V.A.


Journal of geophysical research. D, Atmospheres 105 (2000), Nr.4, S.4563-4572
ISSN: 0148-0227
Fraunhofer IFU; 2002 in Helmholtz-Gesellschaft integriert

Trajectory calculations are employed to identify Stratospheric Aerosol and Gas Experiment (SAGE) II flights sampling the same air mass as is observed by a groundbased aerosol lidar at Garmisch-Partenkirchen, Germany (47.5°N, 11.1°E, 735 m above sea level), during the periods of January-April 1993 and January-December 1998. Intercomparisons between lidar-observed and SAGE II-derived backscatters at 532 nm are conducted. Percentage differences between trajectory-tracked SAGE II profiles and ground-based lidar observations with respect to aerosol lidar are generally within 20 - 40 %, though localized discrepancies > 50 % are found for some cases. In addition, aerosol extinction, aerosol to molecular extinction ratio, and ozone mixing ratio profiles obtained from the SAGE II flights overpassing the vicinity of Garmisch-Partenkirchen during the January-April 1993 period are compared with profiles obtained from corresponding trajectory-tracked SAGE II flights. Percentage discrepancies between SAGE II ozone profiles are generally within 10 - 20 % above the Junge layer. Data comparisons for aerosol profiles show mixed results. While some cases agree within the error bars, there are several cases where percentage discrepancies exceed 50 %.