A Lagrangian biogeochemical study of an eddy in the Northeast Atlantic
A Lagrangian biogeochemical study of an eddy in the Northeast Atlantic
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DOI：
10.1016/j.pocean.2008.01.006
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发表时间：
2008-03
影响因子：
4.1
通讯作者：
T. Jickells;P. Liss;Wendy Broadgate;S. Turner;A. Kettle;J. Read;J. Baker;L. Cárdenas;F. Carse
中科院分区：
文献类型：
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作者：
T. Jickells;P. Liss;Wendy Broadgate;S. Turner;A. Kettle;J. Read;J. Baker;L. Cárdenas;F. Carse
我们报告的实验结果在东北大西洋中，六氟化硫（SF6）被释放在涡流和行为的示踪气体，营养物质和生产力随后在拉格朗日框架内超过24天。还在涡流上方的空气中进行了测量，以估计某些成分的海气交换率。涡的物理，生物和地球化学性质类似于在这一领域研究的其他涡，这表明我们报告的结果可能适用于超出特定的涡研究。在实验开始时的低风速期间，我们能够定量地描述和平衡涡流的养分和碳收支。我们还报告了该地区的各种痕量气体的浓度，这些浓度与其他研究中观察到的浓度相似，我们估计了几种痕量气体的交换率。我们表明，气体交换的重要性在其他损失方面随时间而变化，也不同的气体。我们表明，各种微量气体（CO2，二甲基硫醚（DMS），N2O，CH4，非甲烷烃，甲基溴，甲基碘和挥发性硒物种）都受到物理和生物过程的影响，但个别气体的整体分布和时间变化是彼此不同的。实验期间，一场风暴扰乱了涡流中的分层，导致地表水的营养供应增加、气体交换率增加以及浮游生物群落的变化（我们对此进行了量化），尽管总体生产力变化不大。沃茨。重点放在温带海洋风暴的规律性和这些随机过程在这样的系统的重要性。
We report the results of an experiment in the Northeast Atlantic in which sulphur hexafluoride (SF6) was released within an eddy and the behaviour of trace gases, nutrients and productivity followed within a Lagrangian framework over a period of 24 days. Measurements were also made in the air above the eddy in order to estimate air–sea exchange rates for some components. The physical, biological and biogeochemical properties of the eddy resemble those of other eddies studied in this area, suggesting that the results we report may be applicable beyond the specific eddy studied. During a period of low wind speed at the start of the experiment, we are able to quantitatively describe and balance the nutrient and carbon budgets for the eddy. We also report concentrations of various trace gases in the region which are similar to those observed in other studies and we estimate exchange rates for several trace gases. We show that the importance of gas exchange over other loss terms varies with time and also varies for the different gases. We show that the various trace gases considered (CO2, dimethyl sulphide (DMS), N2O, CH4, non-methane-hydrocarbons, methyl bromide, methyl iodide and volatile selenium species) are all influenced by physical and biological processes, but the overall distribution and temporal variability of individual gases are different to one another. A storm disrupted the stratification in the eddy during the experiment, resulting in enhanced nutrient supply to surface waters, enhanced gas exchange rates and a change in plankton community, which we quantify, although overall productivity was little changed. Emphasis is placed on the regularity of storms in the temperate ocean and the importance of these stochastic processes in such systems.