North Atlantic production of nitrous oxide in the context of changing atmospheric levels
North Atlantic production of nitrous oxide in the context of changing atmospheric levels
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DOI：
10.1029/2009gb003472
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发表时间：
2009-11-03
影响因子：
5.2
通讯作者：
Bange, H. W.
中科院分区：
文献类型：
--
作者：
Freing, A.;Wallace, D. W. R.;Bange, H. W.
我们使用的过境时间分布计算的示踪剂数据与原位测量的N2 O估计生物产生的N2 O（[N2 O]（XS））和N2 O生产率在北大西洋中部的浓度。我们的方法来估计N2 O的生产率集成的潜在变化的生产和分解机制的影响沿着运输路径的水团。我们发现，以前使用的方法高估了8-13%的海洋平衡N2 O浓度，从而低估了大部分水柱中N2 O源的强度。因此，[N2 O]（xs）/AOU的关系作为硝化作用的指标被扭曲的定量特征。我们开发了一个新的参数化的硝化过程中N2 O的生产取决于AOU线性和指数的温度和深度，它可以应用于计算N2 O生产由于硝化在整个海洋，包括氧气最小区。
We use transit time distributions calculated from tracer data together with in situ measurements of N2O to estimate the concentration of biologically produced N2O ([N2O](xs)) and N2O production rates in the central North Atlantic Ocean. Our approach to estimation of N2O production rates integrates the effects of potentially varying production and decomposition mechanisms along the transport path of a water mass. We find that previously used approaches overestimate the oceanic equilibrium N2O concentrations by 8-13% and thus underestimate the strength of N2O sources in large parts of the water column. Thus the quantitative characteristics of the [N2O](xs)/AOU relationship used as an indicator of nitrification are distorted. We developed a new parameterization of N2O production during nitrification depending linearly on AOU and exponentially on temperature and depth, which can be applied to calculate N2O production due to nitrification in the entire ocean including oxygen minimum zones.