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URN: urn:nbn:de:bsz:16-opus-9344
URL: http://www.ub.uni-heidelberg.de/archiv/934
Hinweis zum Urheberrecht.
Study of atmospheric carbon monoxide and methane
Untersuchung von atmosphärischem Kohlenmonoxid und Methan
pdf-Format:
Dokument 1.pdf (3 KB)
Dokument 2.pdf (2.733 KB)
SWD-Schlagwörter:
Isotopomer , Methan , Kohlenmonoxid , Firn
Freie Schlagwörter (Deutsch):
Izana
Freie Schlagwörter (Englisch):
isotopomer , methane , carbon monoxide , firn
Institut:
Institut für Umweltphysik
Fakultät:
Fakultät für Physik und Astronomie
DDC-Sachgruppe:
Physik
Sonstige beteiligte Institution:
Max-Planck Institut für Chemie, Abt. Luftchemie
Dokumentart:
Dissertation
Hauptberichter:
Platt, Ullrich (Prof.)
Sprache:
Englisch
Tag der mündlichen Prüfung:
18.07.2000
Erstellungsjahr:
2000
Publikationsdatum:
10.08.2000
Kurzfassung in Deutsch:
The analysis of isotope ratios is widely used for the
investigation of atmospheric trace gases. We measured the stable
isotopes d13C and dD of atmospheric CH4 as well as d13C, d18O and
the 14CO concentrations of atmospheric CO at Izana, Tenerife, from
1996 to 1999. We report the first directly measured dD
seasonality for atmospheric background CH4. The large seasonal
cycles in mixing and isotopic ratios of CH4 and CO enable
inferences about the underlying source and sink processes. The
large synoptic scale variations occurring for these trace gases at
Izana made it possible to study source regions such as North
America, Europe, as well as background conditions over the North
Atlantic and Africa. We also measured d13C and dD on firn air
samples from two Antarctic sites. From these measurements the
atmospheric trends of d13C and dD of CH4 over the past fifty years
have been reconstructed with the help of a firn air diffusion
model. We find that parallel to increasing CH4 mixing ratios d13C
increases, which is evidence for a growing contribution of the
heavier anthropogenic CH4 sources. For dD we find a period of
decline previous to 1975, followed by a gradual increase. This dD
minimum is due to the non-equilibrium state between CH4 and its
sources and sinks and has for the first time been detected for
dD.
Kurzfassung in Englisch:
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