Stable isotope fractionation during ultraviolet photolysis of N2O

被引：55

作者：

Rahn, T ^{[1
]}

Zhang, H

Wahlen, M

Blake, GA

机构：

[1] Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA

[2] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 1998年 / 25卷 / 24期

关键词：

D O I：

10.1029/1998GL900186

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

biogeochemical cycling of nitrous oxide plays an important role in greenhouse forcing and ozone regulation. Laboratory studies of N2O:N-2 mixtures irradiated between 193-207 nm reveal a significant enrichment of the residual heavy nitrous oxide isotopomers. The isotopic signatures resulting from photolysis are well modeled by an irreversible Rayleigh distillation process, with large enrichment factors of epsilon(15,18)(193 nm)= -18.4, -14.5 per mil and epsilon(15,18)(207 nm)= -48.7, - 46.0 per mil. These results, when combined with diffusive mixing processes, have the potential to explain the stratospheric enrichments previously observed.

引用

页码：4489 / 4492

页数：4

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