Stable isotope enrichment in stratospheric nitrous oxide
Stable isotope enrichment in stratospheric nitrous oxide
复制标题
平流层一氧化二氮中的稳定同位素富集
作者：
T. Rahn;M. Wahlen
一氧化二氮是一种温室气体，也在平流层臭氧循环中发挥作用。来自平流层下部的空气样品显示出一氧化二氮的15 N/14 N和18 O/16 O富集，这可以用描述不可逆破坏过程的简单模型来解释。观测到的富集程度相当大，与平流层一氧化二氮主要的光解和与受激原子氧反应的损失过程所确定的富集程度不一致。因此，虽然不需要援引平流层来源，但数据表明，目前对平流层一氧化二氮化学的了解是不完整的。
Nitrous oxide is a greenhouse gas that also plays a role in the cycling of stratospheric ozone. Air samples from the lower stratosphere exhibit 15N/14N and 18O/16O enrichment in nitrous oxide, which can be accounted for with a simple model describing an irreversible destruction process. The observed enrichments are quite large and incompatible with those determined for the main stratospheric nitrous oxide loss processes of photolysis and reaction with excited atomic oxygen. Thus, although no stratospheric source needs to be invoked, the data indicate that present understanding of stratospheric nitrous oxide chemistry is incomplete.