Ground‐based measurements of O 3 and NO 2 columns at Kiruna (68°N) and Arrival Heights (78°S) were used to validate stratospheric profile measurements of the same species by the satellite‐based Improved Limb Atmospheric Spectrometer (ILAS) flown between November 1996 and June 1997. In addition, measurements of HNO 3 , CH 4 , and N 2 O made at Arrival Heights are compared with measurements of these species by ILAS. Even though there were no temporal coincidences in the latter comparison, the ground‐based data provide a climatological context for the ILAS measurements. ILAS profiles measured within 10° of longitude and 2° of latitude of each site were used. For the species with large tropospheric components (CH 4 and N 2 O), ILAS profiles were integrated upward from 12 km and were compared with ground‐based retrievals of partial columns above 12 km. For O 3 , which is primarily stratospheric but has an appreciable tropospheric component, tropospheric columns (typically to 8–10 km altitude) calculated from ozonesonde climatologies were added to the integrated ILAS profiles to allow comparison with ground‐based total column ozone measurements. Tropospheric columns of HNO 3 and NO 2 were assumed to be sufficiently small so that ILAS profiles integrated above 8 km could be compared directly with ground‐based total column measurements.
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Wood et al. (2002) studied this question.
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