Total VOC reactivity in the planetary boundary layer 1. Estimation by a pump and probe OH experiment

OH- radical reactivity with total volatile org. compds. (VOC), SkVOC[VOC], is directly obtained in the planetary boundary layer (PBL). A method is based on a perturbation technique where high initial OH- concns. are created by flash photolysis of O3 and subsequent reaction of O(1D) with H2O. Laser-induced fluorescence measures residual OH- concn. at different time delays after the perturbation (<100 ms) to obtain a direct est. of OH- lifetime (tOH) under different atm. conditions. For specific exptl. conditions, transport by wind may be neglected, and chem. processes governing OH- decay may be expressed using a detailed box model. With a simple chem. equation derived using tOH and complementary measurements of CO, O3, and NOx, an in-situ est. of SkVOC[VOC] in the PBL is retrieved with an uncertainty <20% vs. detailed box model calcns. This anal. was applied to lab. measurements with 3 synthetic NOx/VOC/O3 gas mixts.; retrieved OH- lifetimes and total VOC reactivity are discussed against model predictions.


Published in:
Journal of Geophysical Research, 106, D3, 3083-3093
Year:
2001
Keywords:
Note:
Copyright 2003 ACS
CAPLUS
AN 2001:166388
CAN 134:270319
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 (estg. total volatile org. compd. reactivity in planetary boundary layer by pump and probe hydroxyl radical expts. under different atm. conditions); Aldehydes; Alkanes; Alkenes; Aromatic compounds; Carbonyl compounds; Volatile organic compounds Role: POL (Pollutant), RCT (Reactant), OCCU (Occurrence), RACT (Reactant or reagent) (estg. total volatile org. compd. reactivity in planetary boundary layer by pump and probe hydroxyl radical expts. under different atm. conditions); Air pollution (photochem.; estg. total volatile org. compd. reactivity in planetary boundary layer by pump and probe hydroxyl radical expts. under different atm. conditions)
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