 |
| Titel |
Continuous measurements of nitrous oxide isotopomers during incubation experiments. |
| VerfasserIn |
Malte Nordmann Winther, David Balslev-Clausen, Thomas Blunier, Bo Elberling, Søren Christensen |
| Konferenz |
EGU General Assembly 2014
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250090823
|
| Publikation (Nr.) |
 EGU/EGU2014-5082.pdf |
|
|
|
|
|
| Zusammenfassung |
| Nitrous oxide (N2O) is an important and strong trace greenhouse gas in the atmosphere;
it is part of a feed-back loop with climate. N2O is produced by microbes during
nitrification and denitrification in the terrestrial and oceanic realm where today
1/3 of the production is estimated to stem from oceanic sources. The position of
the isotope 15N in the linear N=N=O molecule can be distinguished between the
central or terminal position (the isotopomers of N2O). It has been demonstrated that
nitrification and denitrification have a relative preference for the terminal and central
position, respectively. Therefore it is claimed that measuring the site preference in
N2O allows to determine the responsible production process i.e. nitrification and
denitrification.
Our recent instrument development in collaboration with Picarro Inc. allows for continuous
position dependent δ15N measurements. We present results from incubation experiments with
nitrification and denitrification bacteria. The results generally confirm previous experiments.
However with full denitrifier strains, where nitrous oxide is also consumed during
denitrification, we observe a clear difference in the site preference for the production and the
consumption steps. |
|
|
|
|
|
|