Measurements of reactive nitrogen in Grand Teton National Park

摘要: Measurements collected during the GrandTReNDS field campaign suggest that ammonia was the most abundant atmospheric reactive nitrogen species at the core site, and concentrations showed a clear daily pattern, with maximum concentrations around noon and minimum concentrations during nighttime hours. Dry deposition of ammonia and wet deposition of ammonium provided the dominant pathways for reactive nitrogen deposition during the study period. Low atmospheric concentrations of nitric acid resulted in a low dry deposition flux. Low concentrations of nitrogen-containing fine particles resulted in small dry deposition fluxes. In addition to the nitrogen sources noted above, we found elevated concentrations of all measured nitrogen species when impacted by biomass burning, suggestive of a potentially large, intermittent natural source of atmospheric reactive nitrogen in this region.