HR: 10:50h
AN: B12A-03 INVITED     [Abstracts]
TI: Passive Samplers for Monitoring Insidious N Air Pollutants and Estimating N Deposition to Terrestrial Ecosystems
AU: * Bytnerowicz, A
EM: abytnerowicz@fs.fed.us
AF: USDA Forest Service, Pacific Southwest Research Station, 4955 Canyon Crest Drive, Riverside, CA 92507 United States
AB: Ammonia (NH3), nitric acid vapor (HNO3), nitric oxide (NO) and nitrogen dioxide (NO2) are the main biologically important nitrogenous (N) air pollutants. At highly elevated concentrations, these pollutants have a potential of causing injury to sensitive plants. More importantly, gaseous N pollutants may provide significant amounts of atmospheric N to the terrestrial ecosystems. This is especially true for wildlands affected by photochemical smog and agricultural emissions (e.g. mountains near California Central Valley or Los Angeles Basin). Passive samplers developed in the 1990s and 2000s have allowed for reliable monitoring of ambient concentrations of the pollutants at large geographic scales. Information on spatial and temporal distribution of NH3, HNO3, NO and NO2 from passive samplers may allow for determining potential "hot spots" of N pollutants effects. Information on ambient concentrations of gaseous N can also be used for estimates of N deposition to various ecosystems. Monitoring of N air pollutants and estimates of N deposition have been conducted in deserts, coastal sage, serpentine grassland, chaparral, and mixed conifer forests in California. These efforts and potential future use of passive samplers will be discussed.
DE: 1694 Instruments and techniques
DE: 1630 Impact phenomena
DE: 0315 Biosphere/atmosphere interactions
DE: 0345 Pollution--urban and regional (0305)
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting