Open AccessBoundary layer vertical exchange processes and the mass budget of ozone: Observations and model results
Author(s) -
Berkowitz Carl M.,
Fast Jerome D.,
Easter Richard C.
Publication year - 2000
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2000jd900026
Subject(s) - ozone , atmospheric sciences , environmental science , mixing ratio , ozone layer , boundary layer , convective boundary layer , planetary boundary layer , convective mixing , troposphere , mixing (physics) , tropospheric ozone , ozone depletion , climatology , convection , meteorology , geology , geography , physics , quantum mechanics , thermodynamics
An Eulerian chemical model is used to assess the relative importance of a variety of processes associated with producing high surface ozone episodes during selected periods of the North American Research Strategy for Tropospheric Ozone (NARSTO) 1995 field campaign over the northeastern United States. A comparison of the observed and predicted hourly surface ozone mixing ratios showed that the model qualitatively reproduced the observed ozone trends over the northeastern United States. The model had a mean hourly bias of ∼15 ppb with a wide range of skill compared to individual observing stations clustered around one node. The simulated mass budget tendency terms are compared for days with low ozone values immediately followed by days with high values. The later days showed observed and simulated ozone mixing ratios aloft to be of order twice that found on preceding days, although the associated chemical mix appeared to have relatively little potential for the subsequent generation of “new” ozone. Under conditions of shallow mixing over urban regions, simulated surface ozone production rates were negative (a net loss) throughout much of the day with convective mixing bringing newly produced ozone from aloft to the surface. It is noted that surface ozone levels appeared to be relatively insensitive to mixing layer growth rates.