Offshore transport of particulate organic carbon in the California Current System by mesoscale eddies

Offshore transport of particulate organic carbon in the California Current System by mesoscale eddies
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加州洋流系统中中尺度涡流颗粒有机碳的近海输送

DOI:
10.1038/s41467-019-12783-5
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发表时间:
2019
影响因子:
16.6
通讯作者:
Medeiros, Patricia M.
Medeiros, Patricia M.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Amos, Caitlin M.;Castelao, Renato M.;Medeiros, Patricia M.

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加州洋流系统的特点是上升流和丰富的中尺度涡旋活动。气旋涡旋通常会从加州洋流中的蜿蜒水流中剥离,可能会将海岸上涌的水困住,并将其输送到近海。在这里,我们使用卫星测量的颗粒有机碳(POC)作为海岸水的示踪剂,以表明位于近海的气旋在海岸附近产生的气旋在其内部的碳浓度高于在近海产生的相同幅度的气旋。这表明,涡旋实际上是对近海海水的捕获和输送,导致近海POC的富集量为20.9 ± 11GG年−1。这种由海岸产生的涡旋导致的POC富集量从岸边延伸到1000 公里。这一分析提供了基于大规模观测的证据,表明涡旋在沿海水域的近海输送中发挥着数量上的重要作用,大大扩大了受加州洋流系统中高生产力上涌水影响的区域。
The California Current System is characterized by upwelling and rich mesoscale eddy activity. Cyclonic eddies generally pinch off from meanders in the California Current, potentially trapping upwelled water along the coast and transporting it offshore. Here, we use satellite-derived measurements of particulate organic carbon (POC) as a tracer of coastal water to show that cyclones located offshore that were generated near the coast contain higher carbon concentrations in their interior than cyclones of the same amplitude generated offshore. This indicates that eddies are in fact trapping and transporting coastal water offshore, resulting in an offshore POC enrichment of 20.9 ± 11 Gg year−1. This POC enrichment due to the coastally-generated eddies extends for 1000 km from shore. This analysis provides large-scale observational-based evidence that eddies play a quantitatively important role in the offshore transport of coastal water, substantially widening the area influenced by highly productive upwelled waters in the California Current System.
中尺度对有机碳从加那利上升流系统到开放的北大西洋的远距离海上输送的贡献
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