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5. Auxiliary Measurements

In parallel with the Geophysica flights, ground-based and balloon measurement were made in parallel with the Geophysica flights from different sites in Tierra del Fuego and on the Antarctic Peninsula. Ground-based ozone, NO₂, SO₂ and UV radiation measurements were carried out from Ushuaia. On the Antarctic Peninsula, real-time measurements of total ozone and NO₂ were obtained from the base of the British Antarctic Survey in Rothera (67° 34’ S; Long. 68° 07’ W), along with radiosonde launches. ozone soundings, temperature, humidity and wind radiosondes. Total column ozone values were obtained from the Argentinean bases of Marambio (64°23' S, 56°72' W) and of Belgrano II (Lat. 77º 52' S; Long. 34º 37' W), the activity in the former base being performed in collaboration with the Finnish Meteorological Institute. From these two bases ozone and NO₂ measurements were also obtained by the INTA (Spain) and CNR-IFA (Italy).

A preliminary comparison of the ozone measurements made from Marambio and those made from the limb sounding instruments on-board the aircraft during the flight of 23^rd September 1999 is shown in Fig. 8. The plot shows the ozone mixing ratio vertical profile measured by the ozone sonde and the averaged profiles obtained from four sequences recorded by MIPAS-STR and SAFIRE-A over Marambio. The comparison is possible up to the aircraft altitude (approximately 18 km), above which MIPAS-STR and SAFIRE-A simply scale the initial profiles from a column measurement.

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