Shelf Sea Biogeochemistry: Nutrient and carbon cycling in a temperate shelf sea water column

Shelf Sea Biogeochemistry: Nutrient and carbon cycling in a temperate shelf sea water column
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陆架海洋生物地球化学:温带陆架海水柱中的营养物和碳循环

DOI:
10.1016/j.pocean.2019.102182
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发表时间:
2019
影响因子:
4.1
通讯作者:
Sharples J
Sharples J
中科院分区:
地球科学1区
文献类型:
--
作者:
Sharples J

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这期特刊介绍了2014年3月至2015年8月期间在西北欧大陆架进行的英国大陆架海洋生物地球化学研究计划的一些主要发现。该项目旨在解决两个问题:(1)温带大陆架海如何维持每年的净下降和大气CO2的输出,而不会耗尽无机营养素,(2)目前的生态系统模型中的过程或参数化的不确定性可以通过协调,多学科的观测计划,涵盖整个季节周期减少?与欧洲各地的合作伙伴合作,确认了整个西北欧大陆架大气中二氧化碳的年净减少量。这表明了在凯尔特海进行为期17个月的过程研究的背景和动力,研究使用了长期系泊阵列和几次研究航行,涉及陆架海洋物理学、无机和有机营养物和碳循环以及细菌、浮游植物和浮游动物的作用和动态。从物理学上可以清楚地看出,一年内通过海面吸收的所有碳都没有被输出到公海。物理运输太弱,太慢,无法在一年内将所有载碳水从广阔的陆架海运输到陆架边缘。因此,陆架海必须能够以一种防止释放回大气的形式储存碳,其时间尺度足以允许更多的偶发性(时间尺度>1年)交换事件,以去除多余的碳并补充无机营养物的陆架池。在这个特殊的问题上提出的结果说明了可能的关键作用,溶解的有机碳在大陆架上储存碳,并强调需要长期的测量或监测,以了解性质和时间的潜在的大,但不频繁的交换事件之间的大陆架和公海。
This special issue presents some of the key findings from the pelagic component of the UK Shelf Sea Biogeochemistry Research Programme, carried out on the northwest European shelf between March 2014 and August 2015. The project aimed to address two issues: (1) how does a temperate shelf sea sustain an annual net drawdown and export of atmospheric CO2without running out of inorganic nutrients, and (2) what uncertainties in processes or parameterisations within current ecosystem models can be reduced by a coordinated, multi-disciplinary observational programme covering the full seasonal cycle? Working with partners across Europe, the net annual drawdown of atmospheric CO2over the entire northwest European shelf was confirmed. This demonstrated the context and impetus for a 17-month process study in the Celtic Sea, using a long-term mooring array and several research cruises, addressing shelf sea physics, inorganic and organic nutrient and carbon cycling, and bacterial, phytoplankton and zooplankton roles and dynamics. It was clear from the physics that all the carbon absorbed through the sea surface over one year was not exported to the open ocean. Physical transports were too weak and too slow to transport all the carbon-laden water over a wide shelf sea to the shelf edge within one year. The shelf sea must therefore be able to store carbon in a form that prevents release back to the atmosphere for a timescale that is sufficient to allow more episodic (timescales >1 year) exchange events to both remove the excess carbon and top-up the shelf pool of inorganic nutrients. The results presented in this special issue illustrate the likely key role of recalcitrant dissolved organic carbon in storing carbon on the shelf and highlight the need for longer-term measurements or monitoring to understand the nature and timing of potentially large but infrequent exchange events between the shelf and open ocean.
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