MOPS-1 . 0 : towards a model for the regulation of the global oceanic nitrogen budget by marine biogeochemical processes
MOPS-1 . 0 : towards a model for the regulation of the global oceanic nitrogen budget by marine biogeochemical processes
复制标题
MOPS-1。
DOI：
--
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
A. Oschlies
中科院分区：
文献类型：
--
作者：
I. Kriest;A. Oschlies
海洋氮循环的全球模型在相关生物地球化学过程的表示以及决定全球氮预算监管的空间和时间尺度的氮源和汇之间的反馈方面存在许多不确定性。我们使用海洋生物地球化学的全球模型研究这些方面，该模型明确考虑磷和氮，包括中上层反硝化和固氮分别作为固定氮的汇和源项。该模型探索了有机质沉降速度、有氧和缺氧再矿化的氧化剂亲和力的不同参数化，以及温度和不同化学计量比对固氮的调节。对从观察到的生物地球化学示踪剂分布初始化的不同模型设置的初始瞬态行为的检查揭示了模拟氮库存和通量的变化，特别是在第一个世纪期间。为了使所有生物地球化学和物理过程进入动态一致的稳定状态，必须解决千年时间尺度问题。对全球特性的分析表明，不仅颗粒下沉速度特别重要，而且反硝化的参数化也决定了氧气最小区的范围、全球氮通量，从而决定了海洋氮库存。然而，颗粒下沉、固氮和反硝化的不同参数化影响全局诊断的方式和方向是不同的，这表明这些参数原则上可能彼此独立地受到约束。对观察到的生物地球化学示踪剂分布和通量的模型失配分析表明，颗粒通量分布接近 Martin 等人提出的分布。 （1987）。模拟的中上层反硝化作用与其他作者最近估计的 59 至 84 Tg N yr 之间的较低值最为吻合。
Global models of the oceanic nitrogen cycle are subject to many uncertainties regarding the representation of the relevant biogeochemical processes and of the feedbacks between nitrogen sources and sinks that determine spaceand timescales on which the global nitrogen budget is regulated. We investigate these aspects using a global model of ocean biogeochemistry that explicitly considers phosphorus and nitrogen, including pelagic denitrification and nitrogen fixation as sink and source terms of fixed nitrogen, respectively. The model explores different parameterizations of organic matter sinking speed, oxidant affinity of oxic and suboxic remineralization, and regulation of nitrogen fixation by temperature and different stoichiometric ratios. Examination of the initial transient behavior of different model setups initialized from observed biogeochemical tracer distributions reveal changes in simulated nitrogen inventories and fluxes particularly during the first centuries. Millennial timescales have to be resolved in order to bring all biogeochemical and physical processes into a dynamically consistent steady state. Analysis of global properties suggests that not only particularly particle sinking speed but also the parameterization of denitrification determine the extent of oxygen minimum zones, global nitrogen fluxes, and hence the oceanic nitrogen inventory. However, the ways and directions in which different parameterizations of particle sinking, nitrogen fixation, and denitrification affect the global diagnostics are different suggesting that these may, in principle, be constrained independently from each other. Analysis of the model misfit with respect to observed biogeochemical tracer distributions and fluxes suggests a particle flux profile close to the one suggested by Martin et al. (1987). Simulated pelagic denitrification best agrees with the lower values between 59 and 84 Tg N yr recently estimated by other authors.
登录
查看更多内容
影响因子：
5.2
作者：
Duteil, O.;Oschlies, A.
通讯作者：
Oschlies, A.
赤道洋流系统在设定东热带大西洋含氧量方面的主要作用：高分辨率模型研究
影响因子：
5.2
作者：
Duteil;Schwarzkopf;Böning;Oschlies
通讯作者：
Oschlies
影响因子：
5.2
作者：
Getzlaff, Julia;Dietze, Heiner
通讯作者：
Dietze, Heiner
影响因子：
11.4
作者：
Luo, Y. -W.;Doney, S. C.;Zehr, J. P.
通讯作者：
Zehr, J. P.