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@ARTICLE{vonCzapiewski:34302,
author = {von Czapiewski, K. and Czuba, E. and Huang, L. and Ernst,
M. H. and Norman, A. L. and Koppmann, R. and Rudolph, J.},
title = {{I}sotopic composition of non-methane hydrocarbons in
emissions from biomass burning},
journal = {Journal of atmospheric chemistry},
volume = {43},
issn = {0167-7764},
address = {Dordrecht [u.a.]},
publisher = {Springer Science + Business Media B.V},
reportid = {PreJuSER-34302},
pages = {45 - 60},
year = {2002},
note = {Record converted from VDB: 12.11.2012},
abstract = {The stable carbon isotope ratios of nonmethane hydrocarbons
(NMHC) and methyl chloride emitted from biomass burning were
determined by analyzing seven whole air samples collected
during different phases of the burning process as part of a
laboratory study of wood burning. The average of the stable
carbon isotope ratios of emitted alkanes, alkenes and
aromatic compounds is identical to that of the burnt fuel;
more than $50\%$ of the values are within a range of
+/-1.5parts per thousand of the composition of the burnt
fuel wood. Thus for the majority of NMHC emitted from
biomass burning stable carbon isotope ratio of the burnt
fuel a good first order approximation for the isotopic
composition of the emissions.Of the more than twenty
compounds we studied, only methyl chloride and ethyne
differed in stable carbon isotope ratios by more than a few
per mil from the composition of the fuel. Ethyne is enriched
in C-13 by approximately 20-30parts per thousand, and most
of the variability can be explained by a dependence on flame
temperature. The delta(13)C values decrease by 0.019parts
per thousand/K (+/- 0 0053parts per thousand/K) with
increasing temperature.Methyl chloride is highly depleted in
C-13, on average by 25parts per thousand. However the
results cover a wide range of nearly 30parts per thousand.
Specifically, in two measurements with wood from Eucalyptus
(Eucalyptus delegatensis) as fuel we observed the emission
of extremely light methyl chloride (-68.5parts per thousand
and -65.5parts per thousand). This coincides with higher
than average emission ratios for methyl chloride (15.5 x
10(-5) and 18 x 10(-5) mol CH3Cl/ mol CO2). These high
emission ratios are consistent with the high chlorine
content of the burnt fuel, although, due to the limited
number of measurements, it would be premature to generalize
these findings. The limited number of observations also
prevents any conclusion on a systematic dependence between
chlorine content of the fuel, emission ratios and stable
carbon isotope ratio of methyl chloride emissions. However,
our results show that a detailed understanding of the
emissions of methyl chloride from chloride rich fuels is
important for understanding its global budget. It is also
evident that the usefulness of stable carbon isotope ratios
to constrain the global budget of methyl chloride will be
complicated by the very large variability of the stable
carbon isotope ratio of biomass burning emissions.
Nevertheless, ultimately the large fractionation may provide
additional constraints for the contribution of biomass
burning emissions to the atmospheric budget of methyl
chloride.},
keywords = {J (WoSType)},
cin = {ICG-II},
ddc = {540},
cid = {I:(DE-Juel1)VDB48},
pnm = {Chemie und Dynamik der Geo-Biosphäre},
pid = {G:(DE-Juel1)FUEK257},
shelfmark = {Environmental Sciences / Meteorology $\&$ Atmospheric
Sciences},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000176760900003},
doi = {10.1023/A:1016105030624},
url = {https://juser.fz-juelich.de/record/34302},
}