Scientific Theme: Advanced Modeling and Observing Systems

k 1(T) (10 -11 cm 3 molecule -1 s -1 )
400 333 286 250 222 200 K
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1000/T (K -1 )
Scientific Theme: Regional Processes
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Right. Comparison of k1(T) from various previous
studies. The solid line is the unweighted fit of the
data of Sivakumaran and Crowley and of the
present measurements to an Arrhenius expression.
The dashed lines represent the upper and lower
bounds of k1(T) at the 95% confidence level.
GMD06: Baseline Air Quality
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k 10(T) (10 -11 cm 3 molecule -1 s -1 )
k 1 , 10 -11 cm 3 molecule -1 s -1
Left. Arrhenius plots for k1(T) (circles) and k10(T)
(squares) from the present study. The individual k1(T)
and k10(T) were obtained from linear least squares
analysis of all and D-D0, respectively, vs. [CH3CHO] at
each temperature. Error bars include precision and
estimated systematic errors at the 95% confidence level.
95
1000 500 400 333 285 250 222 200 K
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This work
Taylor et al. (2006)
Sivakumaran and Crowley (2003)
Dobe et al. (1989)
Michael et al. (1985)
Semmes et al. (1985)
Atkinson and Pitts (1978)
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1000/T (K -1 )
GOAL:
Study intercontinental transport events to improve our understanding of their importance in affecting overall air
quality and its impacts on public health.
MILESTONE GMD06.1:
Carry out daily ozone profile measurements at Trinidad Head, CA and Boulder, CO during the
intensive Measurements of Ozone over North America (MONA) study in August 2006.
ACCOMPLISHMENTS FOR GMD06.1:
During August 2006, near daily ozonesondes were launched from fourteen sites in North America stretching from
Barbados and Mexico City in the south to southern Canada in the north and from the Pacific to the Atlantic coasts.
The purpose was to determine the role of various sources to the tropospheric ozone budget over North America.
Over 400 ozone and meteorological vertical profiles were obtained during the month, including the daily soundings
from Trinidad Head, CA and Boulder, CO. A key finding of this intensive campaign was the important contribution
to the upper tropospheric (6-11 km) ozone budget from lightning-produced nitrogen oxides [Cooper et al., 2007].
This enhancement is collocated with the summertime upper tropospheric anticyclone centered over the southeastern
U.S. Convection associated with the North American summer monsoon located at the westernmost edge of the
anticyclone is the primary source of the lightning-produced nitrogen oxides. Ozone in the upper troposphere over the
Southeast U.S. was nearly twice the amount seen in air entering the west coast of the U.S.
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