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| Titel: |
The isotopic fingerprint of the pre-industrial and the anthropogenic N<sub>2</sub>O source |
| Auteur: |
T. Röckmann J. Kaiser C. A. M. Brenninkmeijer |
| Verschenen in: |
Atmospheric chemistry and physics |
| Paginering: | Jaargang 3 (2003) nr. 2 pagina's 315-323 |
| Jaar: |
2003 |
| Inhoud: |
We have performed high-precision measurements of the <sup>18</sup>O and position dependent <sup>15</sup>N isotopic composition of N<sub>2</sub>O from Antarctic firn air samples. By comparing these data to simulations carried out with a firn air diffusion model, we have reconstructed the temporal evolution of the N<sub>2</sub>O isotope signatures since pre-industrial times. The heavy isotope content of atmospheric N<sub>2</sub>O is presently decreasing for all signatures at rates of about -0.038 %o yr <sup>-1</sup> for <sup>1</sup><font face='Symbol'>d</font><sup>15</sup>N, -0.046 %o yr <sup>-1</sup> for <sup>2</sup><font face='Symbol'>d</font> <sup>15</sup>N and -0.025 %o yr <sup>-1</sup> for <font face='Symbol'>d</font><sup>18</sup>O. The total decrease since pre-industrial times is estimated to be about -1.8%o for <sup>1</sup><font face='Symbol'>d</font><sup>15</sup>N at both positions and -2.2%o for <sup>2</sup><font face='Symbol'>d</font><sup>15</sup>N. Isotope budget calculations using these trends and recent stratospheric measurements allow to isotopically characterize the present and the pre-industrial global average N<sub>2</sub>O source, as well as the additional N<sub>2</sub>O emissions that have caused the global N<sub>2</sub>O increase since pre-industrial times. The increased fluxes from the depleted surface sources alone are insufficient to explain the inferred temporal isotope changes. In addition, the global average N<sub>2</sub>O source signature is calculated to be significantly depleted today relative to the pre-industrial value, in agreement with recent indications from soil emission measurements. |
| Uitgever: |
Copernicus GmbH (provided by DOAJ) |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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