 |
| Titel |
Isotopic Constraints on the Global Budget and Trend of Atmospheric Nitrous Oxide |
| VerfasserIn |
M. C. Liang, Y. L. Yung |
| Konferenz |
EGU General Assembly 2009
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250029714
|
|
|
|
|
|
| Zusammenfassung |
| The importance of N2O arises from the fundamental role it plays in stratospheric chemistry
and its extraordinary potency as a greenhouse molecule. There may be a future unintended
source of N2O. Ocean iron fertilization is being considered as a strategy for sequestering CO2
from the atmosphere. Perhaps the most valuable insight we can gain from a deeper
understanding of N2O is a window into the nitrogen cycle. The use of isotopic fractionation
data could reduce uncertainties in the sources and sinks of a biogenic species, as is
well known in the study of CO2 and CH4. We develop a simple model for various
isotopologues of nitrous oxide (14N14N16O, 14N15N16O, 15N14N16O, 14N14N17O
and 14N14N18O). The model is based on laboratory kinetics measurements and
constrained to reproduce the age of air in the stratosphere. We study two types of models.
The standard model assumes that the primary sources of N2O are the land, the
ocean and agriculture, and the primary sink is destruction in the stratosphere. The
non-standard model explores two additional hypotheses: the consequences of a
climate-related slowdown of the Brewer-Dobson circulation that transports N2O from the
troposphere to the stratosphere and the effect of a biological sink for N2O in the soil. |
|
|
|
|
|
|