Total VOC reactivity in the planetary boundary layer 2. A new indicator for determining the sensitivity of the ozone production to VOC and NOx
A new indicator is proposed to det. whether tropospheric O3 prodn. in a specific area is limited by volatile org. compds. (VOC) or NOx. This indicator, tVOCOH/tNOxOH, describes the ratio of OH- lifetime vs. losses by reaction with VOC and NOx. Whereas tNOxOH can be obtained by conventional measurements, the new pump and probe OH approach makes it possible to also obtain tVOCOH. Indicator values above a threshold value of 0.2 +- 50% are representative of NOx-satd. conditions, where an increase of NOx emissions causes lower O3 prodn. For values <0.01, O3 prodn. is very insensitive to changes of VOC emissions. The robustness of this indicator against several parameters (temp., humidity, photolysis, initial O3 concn.) was tested in a box model and compared to the robustness of other earlier proposed indicators. In contrast to earlier proposed indicators, this new one is not based on photochem. produced long-lived species, but describes the instantaneous regime of an air parcel. Three-dimensional modeling showed this indicator is quite successful for estg. the impact of increased or reduced emissions on O3 concns. for each location in the modeled area. This will make it a very helpful tool for developing O3 abatement strategies.
2001
106
3
3095
3110
Copyright 2003 ACS
CAPLUS
AN 2001:166389
CAN 134:270320
59-2
Air Pollution and Industrial Hygiene
53
Air Pollution Laboratory,Swiss Federal Institute of Technology,Lausanne,Switz. FIELD URL:
Journal
JGRDE3
written in English.
Air pollution; Simulation and Modeling (indicator and model to det. limitation of ozone prodn. to sensitivity to volatile org. compds. and nitrogen oxide reactivity in planetary boundary layer); Aldehydes; Alkanes; Alkenes; Ketones; Volatile organic compounds Role: POL (Pollutant), RCT (Reactant), OCCU (Occurrence), RACT (Reactant or reagent) (indicator and model to det. limitation of ozone prodn. to sensitivity to volatile org. compds. and nitrogen oxide reactivity in planetary boundary layer); Air pollution (photochem.; indicator and model to det. limitation of ozone prodn. to sensitivity to volatile org. compds. and nitrogen oxide reactivity in planetary boundary layer)
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