中尺度涡旋搅拌和微尺度湍流在维持副热带环流生物生产中的作用

IF 5.5 2区 地球科学 Q1 ENVIRONMENTAL SCIENCES
K. Oglethorpe, B. Fernández Castro, C. P. Spingys, A. C. Naveira Garabato, R. G. Williams
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引用次数: 0

摘要

维持浮游植物初级生产和有机碳输出需要向阳光照射的海洋提供营养物质。在副热带环流的广泛下流区,这种营养供应的途径仍然不清楚。来自阳光照射层的有机质垂直下沉及其下方的再矿化导致副热带上层海洋的净向下养分转移。通过中尺度涡旋和亚中尺度锋的上升流,营养物质在密度表面的微尺度混合被用来从温跃层向阳光层重新供应营养物质。然而,需要一种物理机制来补充跨越温跃层基底输出的营养物质,并在年际时间尺度上维持准稳态的上层海洋营养收支。中尺度涡旋沿密度面搅动已成为关闭这一营养收支的可能供应机制。在这里,我们量化了中尺度搅拌和微尺度混合在向副热带海洋低营养区提供营养物质方面的相对重要性,使用了基于全球观测的营养物和等环流扩散率的数据集。在微尺度湍流上,副热带环流温跃层的养分补给以中尺度搅拌为主,占两者总补给的70% ~ 90%。在环流侧翼,搅拌供应是最重要的,在那里,边界流和上升流区促进了急剧的营养梯度和强烈的中尺度活动。中尺度通量提供了足够的营养,以抵消由于向上的微尺度混合进入阳光层而导致的温跃层的耗竭。分析表明,涡旋搅拌对维持亚热带环流内有机碳输出具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The Role of Mesoscale Eddy Stirring and Microscale Turbulence in Sustaining Biological Production in the Subtropical Gyres

The Role of Mesoscale Eddy Stirring and Microscale Turbulence in Sustaining Biological Production in the Subtropical Gyres

The Role of Mesoscale Eddy Stirring and Microscale Turbulence in Sustaining Biological Production in the Subtropical Gyres

The Role of Mesoscale Eddy Stirring and Microscale Turbulence in Sustaining Biological Production in the Subtropical Gyres

The Role of Mesoscale Eddy Stirring and Microscale Turbulence in Sustaining Biological Production in the Subtropical Gyres

Sustaining phytoplankton primary production and organic carbon export requires the physical supply of nutrients to the sunlit ocean. In the extensive downwelling regions of the subtropical gyres, the pathways of this nutrient supply remain unclear. Vertical sinking of organic matter from the sunlit layer and its remineralization below cause net downward nutrient transfer in the upper subtropical ocean. Microscale mixing of nutrients across density surfaces and upwelling by mesoscale eddies and submesoscale fronts have been invoked to re-supply nutrients from the thermocline to the sunlit layer. However, a physical mechanism is required to replenish nutrients exported across the thermocline base and sustain a quasi-steady state upper-ocean nutrient budget on inter-annual timescales. Stirring along density surfaces by mesoscale eddies has emerged as a possible supply mechanism to close this nutrient budget. Here, we quantify the relative importance of mesoscale stirring and microscale mixing in supplying nutrients to the oligotrophic regions of the upper subtropical oceans, using global observationally based data sets for nutrients and diapycnal and isopycnal diffusivities. Mesoscale stirring dominates nutrient replenishment in the thermocline of subtropical gyres over microscale turbulence, contributing to 70%–90% of combined supply by the two processes. The stirring supply is most important along gyre flanks, where boundary currents and upwelling zones promote sharp nutrient gradients and vigorous mesoscale activity. Mesoscale fluxes provide sufficient nutrients to offset depletion in the thermocline due to upward microscale mixing into the sunlit layer. This analysis suggests that eddy stirring is significant in maintaining organic carbon export within subtropical gyres.

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来源期刊
Global Biogeochemical Cycles
Global Biogeochemical Cycles 环境科学-地球科学综合
CiteScore
8.90
自引率
7.70%
发文量
141
审稿时长
8-16 weeks
期刊介绍: Global Biogeochemical Cycles (GBC) features research on regional to global biogeochemical interactions, as well as more local studies that demonstrate fundamental implications for biogeochemical processing at regional or global scales. Published papers draw on a wide array of methods and knowledge and extend in time from the deep geologic past to recent historical and potential future interactions. This broad scope includes studies that elucidate human activities as interactive components of biogeochemical cycles and physical Earth Systems including climate. Authors are required to make their work accessible to a broad interdisciplinary range of scientists.
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