Collaborative Research: Controls on the Production and Isotopic Compositions of N2O

PIS将对表层海洋中一氧化二氮(N2O)的循环进行研究。这项研究的结果将产生除海洋氮循环以外的广泛影响，因为N2O在平流层臭氧减少方面发挥着重要作用，本身就是一种重要的温室气体。这项研究的主要目标是利用实验室和田间实验相结合的方法，确定产生N2O的生物地球化学条件。更具体地说，PIS建议1)在自然丰度水平下测量N2O的N和O2同位素组成，2)进行15N示踪实验，以监测通过硝化和反硝化途径产生N2O的情况，以及3)测量N2O潜在N和O来源的同位素组成。建议在夏威夷海洋时间序列站点(HOT)和北太平洋的一艘邮轮上进行实地实验。

ABSTRACTOCE-9810640 & OCE-9817064The PIs will conduct a study on the cycling of nitrous oxide (N2O) in the surface ocean. The results of this study would have broad impact beyond oceanic nitrogen cycling, as N2O plays a significant role in the reduction of ozone in the stratosphere and is itself an important greenhouse gas. The major goal of this study is to identify, using a combination of laboratory and field experiments, the biogeochemical conditions under which N2O is produced. More specifically, the PIs propose to 1) measure N and O2 isotopic compositions of N2O at natural abundance levels, 2) perform 15N tracer experiments to monitor N2O production via nitrification and denitrification pathways, and 3) measure the isotopic composition of the potential N and O sources of N2O. Field experiments at the Hawaii Ocean Time-series site (HOT) and on a cruise in the North Pacific are proposed.