Vertical profiles of H2, CH4, CO, N20, CFCI3, and CF2CI 2 resulting from gas chromatographic analysis of air samples collected from altitudes between 1.5 and 35.3 km at a latitude of about 44øN are presented. Ten balloon ttights were performed with a neon-cooled cryogenic air sampler designed to collect large air samples at eight different stratospheric heights. Supplementary tropospheric air samples were taken aboard a chartered aircraft. Vertical profiles from 1978 and 1979 are compared with those derived from fights in 1977.Instead of copper wool, a silver wool filter was used during two flights in June 1979. The oxide layer was thermally retube was replaced by a 6-m copper tube. Tests had shown that moved by heating the filter to 300øC while flushing with ultrathis tube was capable of quantitatively destroying more than pure helium gas. However, although the sampling tests with 1540 /•g of ozone at air flow rates less than 8 1 STP/min this filter system were satisfactory prior to the flights, further tests afterward showed that a slight reduction of the CO con-km J M L J M L J M L J M L J M L J M L
A description of a new chemiluminescent balloon sonde for measuring stratospheric nitric oxide is given. First results from three flights at mid‐latitudes are presented, including measurements showing a slow reduction in NO mixing ratio beginning 2½ hours before sunset. A hysteresis in the NO mixing ratio between ascent in the morning and descent in the afternoon was observed. The afternoon values were found to be up to a factor of 2 larger than the morning values.
During aircraft flights in May 1981 from Munich (40°N) to north of the Spitsbergen Islands (82°N) and to Monrovia, Liberia (6°N), air samples were obtained in the altitude range of 8 to 11 km and during the ascents and descents near the airports. These samples have been analyzed for the trace gas mixing ratios of CHa, CO and N20. The results of these analyses are presented and discussed.The results provide new evidence of tropospheric-stratospheric exchange events in the vicinity of the subpolar and subtropical tropopause foldings and possibly show a case of transport of CO-enriched air in the upper troposphere above the North Atlantic Ocean.
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