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  • 1
    Electronic Resource
    Electronic Resource
    On the Budget of OH Radicals and Ozone in an Urban Plume from the Decay of C5–C8 Hydrocarbons and NOx (1997)
    Springer
    Journal of atmospheric chemistry 28 (1997), S. 263-282 
    Details
    ISSN: 1573-0662
    Keywords: ozone ; hydrocarbons ; NOx ; photochemistry ; OH-radicals ; budget
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Simultaneous measurements of ozone and ozoneprecursors were made during a field campaign atSchauinsland in the Black Forest and in the valleynorth of Schauinsland that channels the flow ofpolluted air from the city of Freiburg to the site.From the decay of hydrocarbons and NOx between the twomeasuring sites and the known rate coefficients, theconcentration of OH radicals was calculated. From abudget analysis of OH and HOx it is concluded that therelatively high OH concentrations (5–8 ×106cm-3) in the presence of high NO2concentrations cannot be explained by the knownprimary sources. The budget can be closed if efficientrecycling of OH via HO2 is assumed to occur andthat, based on the measured hydrocarbons, 2 HO2molecules are formed for each OH radical that reactswith a hydrocarbon molecule. This assumption is inaccordance with the budget of Ox obtained from ourmeasurements and with results from earliermeasurements of alkylnitrates and peroxy radicals atSchauinsland. A possible conclusion is that the decayof precursors and production of photooxidants in urbanplumes proceeds at a faster rate than is currentlyassumed. The potential role of biogenichydrocarbons for the radical budget is alsodiscussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005821522256
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  • 2
    Electronic Resource
    Electronic Resource
    Climatology of Ozone, PAN, CO, and NMHC in the Free Troposphere Over the Southern North Atlantic (1997)
    Springer
    Journal of atmospheric chemistry 28 (1997), S. 245-262 
    Details
    ISSN: 1573-0662
    Keywords: free troposphere ; ozone ; non methane hydrocarbons ; peroxyacetylnitrate ; carbon monoxide ; photo chemistry ; North Atlantic ; seasonal cycle ; long range transport ; back-trajectories ; photochemical age
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Free tropospheric measurements of ozone, peroxyacetylnitrate andprecursors (CO, NMHC) that were made within the framework of the EUROTRACsub-project TOR (Tropospheric Ozone Research) between 1990 and 1995 at theGAW station Izana, Tenerife (28°18′N, 16°30′W) arediscussed. The average annual cycles reveal the importance of transport fromnorthern mid-latitudes and the role of photo-chemistry. According toair-mass trajectories, which were supplied to us from AEROCE(Atmosphere/Ocean Chemistry Experiment), transport from northernmid-latitudes is associated with high precursor concentrations in winter,whereas ozone concentrations in winter are not much influenced by transportpatterns, suggesting a rather uniform distribution over the northern part ofthe Northern Hemisphere around mean value of 43 ± 5 ppb. In summer,high ozone concentrations of up to 90 ppb are often encountered duringtransport from north, while the levels of precursors are much lower than inwinter, because of photochemical destruction. Trajectories from southerlylatitudes and the Sahara usually have the lowest ozone concentrationsassociated with them.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005801515531
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  • 3
    Electronic Resource
    Electronic Resource
    A photoelectric detector for the measurement of photolysis frequencies of ozone and other atmospheric molecules (1989)
    Springer
    Journal of atmospheric chemistry 8 (1989), S. 203-227 
    Details
    ISSN: 1573-0662
    Keywords: Atmosphere ; photolysis ; ozone ; nitrogen dioxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Photoelectric detectors for the measurement of photolysis frequencies of different trace gases in the atmosphere are described. They exhibit uniform response characteristics over one hemisphere (2π sr) and wavelength characteristics closely matched to those of the photolysis frequencies J O1D, J NO2, and J NO3, respectively. Absolute calibration of the J O1D detector was performed by chemical actinometry with an accuracy of ±16 percent. Simultaneous measurements of J NO2 and J O1D are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00051494
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