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- W2023302913 abstract "Measurement of NO/sub 2/ and NO has been carried out in Piedmont, N.C. and in the southern Appalachian Mountains. Average values for the Piedmont were: continuous NO/sub 2/ measured 30 ft above surface, 0.76 pphm (14.3 ..mu..g/m/sup 3/), 120 ft, 0.61 pphm (11.5 ..mu..g/m/sup 3/); simultaneous values (also Piedmont) (2-hr discrete samples) taken at an earlier time at 4 ft, NO/sub 2/, 0.56 pphm (10.6 ..mu..g/m/sup 3/), NO, 0.19 pphm (2.34 ..mu..g/m/sup 3/). The mountain top values (5120 ft, 1573 m) were: NO/sub 2/, 0.46 pphm (6.4 ..mu..g/m/sup 3/), NO, 0.26 pphm (2.72 ..mu..g/m/sup 3/). The results of this study furnish further proof that tropospheric NO and NO/sub 2/ are produced at the surface of the earth. Data obtained are consistent with the belief that a major sink for NO/sub x/ is reaction with O/sub 3/ and ultimate conversion to nitrate. Ozone values frequently increased and NO/sub x/ values decreased ahead of cold fronts, probably as a result of deep vertical mixing. Also, in small scale turbulence the changes in NO/sub x/ values and in the O/sub 3/ values tended to be ''out of phase,'' i.e., as O/sub 3/ concentration increased, NO/sub x/ concentration decreased and vice versa. Values ofmore » NO/sub x/ from Green Knob, N.C. (mountain top) also tended to be higher at times when O/sub 3/ values were lowest. The NO/sub 2/ hourly average values in Piedmont, N.C., demonstrated a diurnal cycle reminiscent of diurnal urban changes. An early morning peak was followed by a minimum in mid-afternoon. Next, the values rose to a broad evening peak and then decreased slowly during the night. Reported urban concentrations are usually about ten times those found in Piedmont, N.C.« less" @default.
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- W2023302913 date "1970-09-01" @default.
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- W2023302913 title "Nitrogen Dioxide and Nitric Oxide in Non-Urban Air" @default.
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- W2023302913 doi "https://doi.org/10.1080/00022470.1970.10469446" @default.
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