DEVELOPMENT OF THE METHOD TO MEASURE TOTAL REACTIVE NITROGEN IN THE MIDDLE ATMOSPHERE

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A gold converter system to reduce total reactive nitrogen (NO_y) into NO has been developed. Purified carbon monoxide (CO), passed through charcoal and Teflon filters, is mixed with the sample air to maintain a high conversion efficiency. our balloon- borne converter consists of nineteen gold tubes with an inner diameter of 6 mm. Each tube is 0.2 mm thick and 30 cm long. They are tied together and mounted in a 50 cm long stainless steel tube with an inner diameter of 30 mm. The temperature of the converter is controlled to be 300 <plus-minus>1ﾟC.The efficiency of conversion of NO_2 into NO at stratospheric pressures was measured in the laboratory. NO_2 in purified air with concentrations between 10 and 100 ppbv was prepared by oxidizing NO with ozone produced by a mercury UV lamp. The average value of all the data has been found to be 0.99 with a two sigma standard deviation of 0.02. It is unaffected by ozone.