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Cross‐Shore Flow and Implications for Carbon Export in the California Current Ecosystem: A Lagrangian Analysis
Journal of Geophysical Research: Oceans ( IF 3.3 ) Pub Date : 2020-12-22 , DOI: 10.1029/2020jc016611
P. Chabert 1 , F. d'Ovidio 1 , V. Echevin 1 , M. R. Stukel 2 , M. D. Ohman 3
Affiliation  

Eastern Boundary Current Upwelling Systems are regions of elevated primary production and carbon export and thus play a central role in the global carbon cycle. In these regions, nutrient upwelling occurs in a narrow region close to the coast, but primary production and carbon export are typically observed across a broader region. The fact that productive waters reach the open ocean has important consequences for the biological carbon pump, because such transport connects nutrient sources close to the coast to the deep carbon sinks of the offshore ocean. However, many aspects of this offshore transport are still not known. Here we address seasonal and interannual variability of upwelling‐related cross‐shore flows in the California current ecosystem (CCE) by employing Lagrangian diagnostics of horizontal transport inferred from satellite data. We define an advective age as the time a water parcel flowed offshore of the 500 m isobath. We find that the offshore extension of high Chl‐a waters covaries with the age of a coastal water parcel, and is consistent with mesoscale circulation. Interannual variability in the offshore extent of older waters is primarily driven by mesoscale variability and covaries with large scale forcing by both ENSO and the NPGO. The measured ratio of in‐situ new production: carbon export also covaries with water age, and tends to be ≫ 1 in younger and more balanced in older waters. Our results may help to parameterize the role of the finescale on the export of carbon in upwelling regions for climate resolving models.

中文翻译:

跨岸水流及其对加州当前生态系统碳出口的影响:拉格朗日分析

东部边界流上升系统是初级生产和碳出口增加的地区,因此在全球碳循环中发挥着核心作用。在这些地区,养分上升发生在靠近海岸的狭窄地区,但通常在较宽的地区观察到初级生产和碳出口。生产性水到达公海的事实对生物碳泵产生了重要影响,因为这种运输将靠近海岸的营养源与近海的深碳汇联系起来。但是,这种海上运输的许多方面仍然未知。在这里,我们采用从卫星数据推断出的水平传输的拉格朗日诊断方法,来解决加利福尼亚当前生态系统(CCE)中与上升流有关的跨岸水流的季节性和年际变化。我们将对流年龄定义为水包裹从等深线500 m流出海上的时间。我们发现,高Chla水域的离岸延伸随沿海水域的年龄而变化,并且与中尺度环流一致。老水域离岸范围的年际变化主要是由中尺度尺度的变化和ENSO和NPGO对尺度强迫的协变量引起的。实地新生产的比率:碳的出口量也随水龄而变化,在较年轻的水中趋于≫1,在较老的水中趋于平衡。我们的结果可能有助于参数化精细尺度对上升流地区碳出口的气候解析模型的作用。我们发现,高Chla水域的离岸延伸随沿海水域的年龄而变化,并且与中尺度环流一致。老水域离岸范围的年际变化主要是由中尺度尺度的变化和ENSO和NPGO对尺度强迫的协变量引起的。实地新生产的比例:碳出口也随水龄而变化,在年轻的时候趋向于≫ 1,在老的水中趋于平衡。我们的结果可能有助于参数化精细尺度对上升流地区碳出口的气候解析模型的作用。我们发现,高Chla水域的离岸延伸随沿海水域的年龄而变化,并且与中尺度环流一致。老水域离岸范围的年际变化主要是由中尺度尺度的变化和ENSO和NPGO对尺度强迫的协变量引起的。实地新生产的比例:碳出口也随水龄而变化,在年轻的时候趋向于≫ 1,在老的水中趋于平衡。我们的结果可能有助于参数化精细尺度对上升流地区碳出口的气候解析模型的作用。老水域离岸范围的年际变化主要是由中尺度的变化和ENSO和NPGO在大规模强迫作用下的协变量引起的。实地新生产的比例:碳出口也随水龄而变化,在年轻的时候趋向于≫ 1,在老的水中趋于平衡。我们的结果可能有助于参数化精细尺度对上升流地区碳出口的气候解析模型的作用。老水域离岸范围的年际变化主要是由中尺度尺度的变化和ENSO和NPGO对尺度强迫的协变量引起的。实地新生产的比例:碳出口也随水龄而变化,在年轻的时候趋向于≫ 1,在老的水中趋于平衡。我们的结果可能有助于参数化精细尺度对上升流地区碳出口的气候解析模型的作用。
更新日期:2021-02-15
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