Vertical distribution of ozone and nitric acid vapor on the Mammoth Mountain, eastern Sierra Nevada, California.
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).
Bytnerowicz
Andrzej
A
USDA Forest Service, Pacific Southwest Research Station, 4955 Canyon Crest Drive, Riverside, CA 92507, USA. abytnerowicz@fs.fed.uk
Parker
David R
DR
Padgett
Pamela E
PE
D000393:Air Pollutants / Q000032:analysis*; D002140:California; D004784:Environmental Monitoring; D005843:Geography; D017942:Nitric Acid / Q000032:analysis*; D010126:Ozone / Q000032:analysis*; D014835:Volatilization
D000393:Air Pollutants; D017942:Nitric Acid; D010126:Ozone