During May and June 2007 a field campaign was carried out at Summit, Greenland (altitude 3.2 km, latitude = 72.55°N) to investigate the importance of halogens in this remote environment. Instruments were deployed to obtain a large suite of observations that included: BrO, Hg°, reactive gaseous mercury (RGM) , OH, RO2, CO, NO, O3, HCl, HNO3, HO2NO2, SO2, soluble bromide, snow ionic composition, and J values. Significant levels of BrO (1-3 pptv) were often observed by both a differential optical absorption spectrometer (DOAS) and a chemical ionization mass spectrometer (CIMS). Both BrO and soluble bromide appear to be reasonably correlated with solar radiation. Depletion of elemental mercury and production of RGM was also frequently observed. These results indicate that halogen chemistry is active at Summit during summer. A summary of our preliminary observations as well as the impact of halogen chemistry on HOx radicals will be presented.
AGU Fall Meeting Abstracts
- Pub Date:
- December 2007
- 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 0365 Troposphere: composition and chemistry