Evidence of Enhanced Atmospheric Ammoniacal Nitrogen in Hells Canyon National Recreation Area: Implications for Natural and Cultural Resources
作者： Linda H. Geiser , Anne R. Ingersoll , Andrzej Bytnerowicz , Scott A. Copeland
DOI: 10.3155/1047-3289.58.9.1223
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摘要: Abstract Agriculture releases copious fertilizing pollutants to air sheds and waterways of the northwestern United States. To evaluate threats natural resources historic rock paintings in remote Hells Canyon, Oregon Idaho, deposition ammonia (NH3), nitrogen oxides (NOx), sulfur dioxide (SO2), hydrogen sulfide (H2S) at five stations along 60 km Snake River valley floor were passively sampled from July 2002 through June 2003, ozone data particulate chemistry obtained Interagency Monitoring Protected Visual Environments (IMPROVE) station Canyon. NH3 concentrations high; biweekly averages peaked 5–19 ppb spring summer nutrient-laden is a likely source. Fine ammonium nitrate (NH4NO3) averaged 2.6 µg/m3 during 20% worst visibility days with winter drainage masses Basin possibly long distance transport southern California. Other within background ra...
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