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.
Keywords: 78-79-5 (Isoprene); 80-56-8 (a-Pinene); 5989-27-5 Role: BOC (Biological occurrence) ; BSU (Biological study ; unclassified) ; POL (Pollutant) ; RCT (Reactant) ; BIOL (Biological study) ; OCCU (Occurrence) ; RACT (Reactant or reagent) (estg. total volatile org. ; air pollution volatile org planetary boundary layer; reactivity volatile org hydroxyl radical planetary boundary layer
Copyright 2003 ACS
Air Pollution and Industrial Hygiene
Air Pollution Laboratory,Swiss Federal Institute of Technology,Lausanne,Switz. FIELD URL:
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)
Atkinson, R; J Phys Chem Ref Data 1997, 26, 215|Atkinson, R; J Phys Chem Ref Data 1997, 26, 521|Brock, J; Chem Phys Lett 1980, 71, 371|Brune, W; Geophys Res Lett 1998, 25, 1701|Calpini, B; Analusis 1999, 27, 291|Calpini, B; Analusis 1999, 27, 328|Chameides, W; J Geophys Res 1992, 97, 6037|Derwent, R; Atmos Environ, Part A 1991, 25, 1661|Ehhalt, D; J Geophys Res 1998, 103, 18981|Fehsenfeld, F; Global Biogeochem Cycles 1992, 6, 389|Finlayson-Pitts, B; Atmospheric Chemistry: Fundamentals and Experimental Techniques 1986|Fuhrer, J; Analusis 1999, 27, 355|Gong, W; Atmos Environ 1993, 27, 2147|Kirchner, F; J Geophys Res, this issue|Kuhn, M; Atmos Environ 1998, 32, 693|Mauldin, R; J Geophys Res 1999, 104, 5817|Molina, L; J Geophys Res 1986, 91, 14501|Neftel, A; Analusis 1999, 27, 325|Paulsen, S; J Geophys Res 1998, 103, 25533|Seinfeld, J; Atmospheric Chemistry and Physics: From Air Pollution to Climate Change 1998|Staffelbach, T; J Geophys Res 1997, 102, 23345|Stockwell, W; J Geophys Res 1990, 95, 16343|Stockwell, W; J Geophys Res 1997, 102, 25847
Record created on 2011-02-01, modified on 2016-08-09