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Vertical distribution of oxides of nitrogen in the semi-urban planetary boundary layer: mixing ratios, sources and transport
 

Summary: Vertical distribution of oxides of nitrogen in the semi-urban
planetary boundary layer: mixing ratios, sources and transport
Thomas C. Moore 1
, Lee J. Sullivan 2
, Paul A. Roelle, Viney P. Aneja *
Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27695-8208, USA
Received 19 January 1999; accepted 28 March 2000
Importance of this paper: Increasing nitric oxide (NO) emissions, in the presence of hydrocarbons and sunlight, are
thought to be the cause of increased regional levels of tropospheric ozone and other photochemical oxidants. Knowledge of
the vertical distribution of ozone and NO in the planetary boundary layer (PBL) is essential to develop eective ozone
control strategies. To date, there is still disagreement in the scienti«c community as to whether NOX is mixed upward or
downward through boundary layer processes. This paper considers one semi urban/rural location and examines which
process (upward or downward) dominates.
Abstract
Measurements of the mixing ratios of tropospheric NO and NOY (de«ned as nitric oxide (NO) + nitrogen dioxide
(NO2) + peroxyacetyl nitrate (PAN) + nitric acid (HNO3) + particulate nitrate (NO└
3 ) + ┴ ┴ ┴) were made over a semi-
urban area of central North Carolina at the surface (10 m) and on a tower at heights of 250 m (820 ft) and 433 m (1420
ft) above ground level (AGL) from December 1994 to February 1995. These measurements were compared with
synoptic weather data and regional and local upper air soundings in an eort to characterize NO and NOY in the

  

Source: Aneja, Viney P. - Department of Marine, Earth and Atmospheric Sciences, North Carolina State University

 

Collections: Environmental Sciences and Ecology; Geosciences