Abstract. Reported here are the first Austral summer measurements of NO at South Pole (SP). They are unique in that the levels are one to two orders of magnitude higher (i.e., median, 225 pptv) than measured at other polar sites. The available evidence suggests that these elevated levels are the result of photodenitrification of the snowpack, in conjunction with a very thin atmospheric mixing depth. Important chemical consequences included finding the atmospheric oxidizing power at SP to be an order of magnitude higher than expected. Measurement Techniques and Model DescriptionNO was measured using a modified chemiluminescence instrument. The instrument was operated in a 50% duty cycle mode, switching between measurements and zero every 5 minutes. Two standard addition calibrations and zero air (artifact) tests were performed each day. The NO calibration gas was intercompared with other NIST traceable standards both before and after the field deployment and was found to be within the manufacturers tolerance (+2 %). The 2cs detection limit for the NO system used in this study was estimated at 6 pptv. After the field deployment, the instrument's calibration was further evaluated using an NO calibration system developed at Georgia
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