Bytnerowicz Andrzej, Parker David R, Padgett Pamela E
USDA Forest Service, Pacific Southwest Research Station, 4955 Canyon Crest Drive, Riverside, CA 92507, USA.
ScientificWorldJournal. 2002 Jan 5;2:1-9. doi: 10.1100/tsw.2002.72.
In August and September 1999 and 2000, concentrations of ozone (O3) and nitric acid vapor (HNO3) were monitored at an elevation gradient (2184-3325 m) on the Mammoth Mountain, eastern Sierra Nevada, California. Passive samplers were used for monitoring exposure to tropospheric O3 and HNO3 vapor. The 2-week average O3 concentrations ranged between 45 and 72 ppb, while HNO3 concentrations ranged between 0.06 and 0.52 microg/m3. Similar ranges of O3 and HNO3 were determined for 2 years of the study. No clear effects of elevation on concentrations of the two pollutants were detected. Concentrations of HNO3 were low and at the background levels expected for the eastern Sierra Nevada, while the measured concentrations of O3 were elevated. High concentrations of ozone in the study area were confirmed with an active UV absorption O3 monitor placed at the Mammoth Mountain Peak (September 5-14, 2000, average 24-h concentration of 56 ppb).
1999年8月、9月以及2000年同期，在加利福尼亚州内华达山脉东部猛犸山海拔2184 - 3325米的梯度区域对臭氧（O₃）和硝酸蒸汽（HNO₃）的浓度进行了监测。使用被动采样器监测对流层O₃和HNO₃蒸汽的暴露情况。两周平均O₃浓度在45至72 ppb之间，而HNO₃浓度在0.06至0.52微克/立方米之间。在该研究的两年中确定了类似的O₃和HNO₃浓度范围。未检测到海拔对这两种污染物浓度有明显影响。HNO₃浓度较低，处于内华达山脉东部预期的背景水平，而测得的O₃浓度有所升高。放置在猛犸山峰的一台有源紫外线吸收O₃监测仪证实了研究区域内臭氧的高浓度情况（2000年9月5日至14日，24小时平均浓度为56 ppb）。
