摘要: Instrument development activity during the third-year study was focused on the detection of NO2, HNO2 and NO3. A third-generation NO2/NO sensor, capable of measuring NO and NO2 simultaneously, was developed and fully tested both f... 展开 Instrument development activity during the third-year study was focused on the detection of NO2, HNO2 and NO3. A third-generation NO2/NO sensor, capable of measuring NO and NO2 simultaneously, was developed and fully tested both for ground-based and airborne field-sampling operations. An in-situ photofragmentation LIF HNO2 was also successfully developed and was used to collect the first HNO2 data for urban Atlanta. Significant progress was also achieved in the development of a long-path differential absorption (LPDA) NO3 system. Three major field studies and one major laboratory investigation were also completed: (1) additional nighttime NO measurements at a field station outside Atlanta; (2) field measurements of HNO2 in urban Atlanta; (3) airborne measurements of NO/NO2 over marine and continental terrain at both high altitudes and within the boundary layer; and (4) laboratory measurements to establish the potential importance of corona discharge in the generation of NOx within electrified clouds. 收起