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Influence of multi-scale dynamics on the vertical nitrate distribution around the Kuroshio Extension: An investigation based on BGC-Argo and satellite data
Progress in Oceanography ( IF 3.8 ) Pub Date : 2021-03-06 , DOI: 10.1016/j.pocean.2021.102543
Tao Wang , Fei Chai , Xiaogang Xing , Jue Ning , Wensheng Jiang , Stephen C. Riser

The vertical delivery of nutrients from deep water into the euphotic zone is one of the major limitations for the ocean primary productivity. In this study, the influence of multi-scale dynamics on the nitrate distribution observed by two BGC-Argo floats around the Kuroshio Extension is investigated. Vertical fluctuations of iso-nitrate surfaces and isopycnals were found to be correlated to the variation of absolute dynamic topography. In the subtropical Northwestern Pacific Ocean, subsurface nitrate concentration was found to be elevated inside a cyclonic mesoscale eddy during summer, while little nitrate was supplied into the surface layer, which was possibly due to the inhibition of seasonal thermocline. On the northern edge of the Kuroshio Extension, elevated euphotic-layer nitrate and surface chlorophyll concentrations were observed along the periphery of an anti-cyclonic eddy. In addition to horizontal advection, upwelling induced by the submesoscale dynamics is suggested to likely play an important role in the enhancements of nitrate and chlorophyll concentrations. The enhanced vertical delivery of nutrients from depth due to submesoscale dynamics has been hypothesized as a significant source for some satellite-observed events of high surface chlorophyll concentration, but direct evidence from in-situ observations is lacking. In this study, the synchronous occurrence of elevated nitrate and chlorophyll concentrations along the periphery of an anti-cyclonic eddy provides an evidence to support this hypothesis to some extent.



中文翻译:

多尺度动力学对黑潮延伸区垂直硝态氮分布的影响:基于BGC-Argo和卫星数据的调查

营养物质从深水垂直输送到富营养区是海洋初级生产力的主要限制之一。在这项研究中,研究了多尺度动力学对黑潮延伸带周围两个BGC-Argo浮标观测到的硝酸盐分布的影响。发现等硝酸盐表面和等高面的垂直波动与绝对动态形貌的变化有关。在亚热带西北太平洋,夏季期间,气旋中尺度涡内部的地下硝酸盐浓度升高,而向表层供应的硝酸盐却很少,这可能是由于季节性温跃层的抑制作用所致。在黑潮延伸区的北边缘,沿反气旋涡流的外围观察到高的共沸层硝酸盐和表面叶绿素浓度升高。除水平对流外,亚中尺度动力学诱发的上升流可能在硝酸盐和叶绿素浓度的增加中可能起重要作用。有人认为,由于亚中尺度的动力学,从深处营养物的垂直垂直输送增加了,这是一些卫星观测到的高表面叶绿素浓度事件的重要来源,但缺乏从原位观察获得的直接证据。在这项研究中,硝酸盐和叶绿素浓度升高同时发生在反气旋涡的外围,这在一定程度上为支持这一假设提供了证据。除水平对流外,亚中尺度动力学诱发的上升流可能在硝酸盐和叶绿素浓度的增加中可能起重要作用。有人认为,由于亚中尺度的动力学,从深处营养物的垂直垂直输送增加了,这是一些卫星观测到的高表面叶绿素浓度事件的重要来源,但缺乏从原位观察获得的直接证据。在这项研究中,硝酸盐和叶绿素浓度升高同时发生在反气旋涡的外围,这在一定程度上为支持这一假设提供了证据。除水平对流外,亚中尺度动力学诱发的上升流可能在硝酸盐和叶绿素浓度的增加中可能起重要作用。有人认为,由于亚中尺度的动力学,从深处营养物的垂直垂直输送增加了,这是一些卫星观测到的高表面叶绿素浓度事件的重要来源,但缺乏从原位观察获得的直接证据。在这项研究中,硝酸盐和叶绿素浓度升高同时发生在反气旋涡的外围,这在一定程度上为支持这一假设提供了证据。有人认为,由于亚中尺度的动力学,从深处营养物的垂直垂直输送增加了,这是一些卫星观测到的高表面叶绿素浓度事件的重要来源,但缺乏从原位观察获得的直接证据。在这项研究中,硝酸盐和叶绿素浓度升高同时发生在反气旋涡的外围,这在一定程度上为支持这一假设提供了证据。有人认为,由于亚中尺度的动力学,从深处营养物的垂直垂直输送增加了,这是一些卫星观测到的高表面叶绿素浓度事件的重要来源,但缺乏从原位观察获得的直接证据。在这项研究中,硝酸盐和叶绿素浓度升高同时发生在反气旋涡的外围,这在一定程度上为支持这一假设提供了证据。

更新日期:2021-03-30
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