...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of oceanography >Insight into nitrous oxide production processes in the western North Pacific based on a marine ecosystem isotopomer model
【24h】

Insight into nitrous oxide production processes in the western North Pacific based on a marine ecosystem isotopomer model

机译：基于海洋生态系统同位素模型对北太平洋西部一氧化二氮生产过程的洞察

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A marine ecosystem model that incorporates nitrous oxide (N2O) production processes (i.e., ammonium oxidation during nitrification and nitrite reduction during nitrifier denitrification) and N isotopomers was developed to estimate the sea–air N2O flux and to quantify N2O production processes. This model was applied to water above the depth of 220?m at two contrasting time series sites, a subarctic station (K2) and a subtropical station (S1) in the western North Pacific. The model was validated with observed N concentration and N isotopomer data sets, and successfully simulated the higher N2O concentrations, higher δ15N values, and higher site preference values for N2O at K2 compared with S1. The annual mean N2O emissions were estimated to be 32.3?mg?N?m?2?year?1 at K2 and 2.7?mg?N?m?2?year?1 at S1. The results of case studies based on this model estimated the ratios of in situ biological N2O production to nitrate production during nitrification to be ~0.22?% at K2 and ~0.06?% at S1. It is also suggested that N2O was mainly produced via ammonium oxidation at K2, but was produced via both ammonium oxidation and nitrite reduction at S1. A large fraction (~80?%) of the ammonium oxidation at K2 was carried out by archaea in the subsurface water. Isotope tracer incubation experiments using an archaeal activity inhibitor supported this hypothesis.
机译：建立了包含一氧化二氮（N2O）生产过程（即，硝化过程中的铵氧化和硝化器反硝化过程中的亚硝酸盐还原）和N同位素异构体的海洋生态系统模型，以估算海洋中的N2O通量并量化N2O的生产过程。该模型被应用于北太平洋西部两个相反的时间序列地点，一个北极地区的亚北极站（K2）和一个亚热带站（S1），深度超过220？m的水中。与观察到的N浓度和N个异构体数据集一起验证了该模型，并成功模拟了与S1相比，较高的N2O浓度，较高的δ15N值和K2处的N2O较高的位点偏好值。在K2的年平均N2O排放量估计为32.3 mg·N·m·m2·2·year-1，在S1的年平均N2O排放为2.7mg·N·m·m2·2·year-1。基于该模型的案例研究结果估计，硝化过程中原位生物N2O产量与硝酸盐产量的比率在K2为〜0.22％，在S1为〜0.06％。还表明，N2O主要是通过在K2处的铵氧化而产生的，但是是通过在S1处的铵氧化和亚硝酸盐的还原而产生的。 K2处很大一部分（〜80 %%）铵氧化是由古细菌在地下水中进行的。使用古细菌活性抑制剂进行同位素示踪剂孵育实验支持了这一假设。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号