Journal article

High resolution vertical distributions of NO3 and N2O5 through the nocturnal boundary layer

Brown S, Dubé W, Osthoff H, Wolfe D, Angevine W, Ravishankara A ...see all

Atmos. Chem. Phys., vol. 7, issue 3 (2007) pp. 139-149

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Abstract

The shallow mixing depth and vertical stratification of the lowest
levels of the atmosphere at night has implications for the chemistry
of nitrogen oxides emitted from the surface. Here we report vertical
profiles of NO3, N2O5 and O3 measured from in-situ instruments on
a movable carriage on a 300 m tower. The study offers high-resolution
(the nocturnal mixing ratios of these compounds vary widely over short
vertical distance scales (10 m or less). Furthermore, there are systematic
differences in the steady state lifetimes of NO3 and N2O5 and in
the partitioning among nitrogen oxides between different near-surface
layers. These differences imply that NO3 and N2O5 occupy distinct
chemical regimes as a function of altitude, potentially serving as
sinks for nitrogen oxides and O3 near the surface but as reservoirs
of NOx and O3 aloft.

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Authors

  • Steven S. Brown

  • William P. Dubé

  • Hans D. Osthoff

  • Dan Wolfe

  • W. M. Angevine

  • A. R. Ravishankara

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