Global chlorophyll distribution induced by mesoscale eddies

Global chlorophyll distribution induced by mesoscale eddies
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中尺度涡旋引起的全球叶绿素分布

DOI:
10.1016/j.rse.2020.112245
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发表时间:
2021-03
影响因子:
13.5
通讯作者:
徐永生
徐永生
中科院分区:
工程技术1区
文献类型:
--
作者:
赵丹丹;徐永生

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虽然中尺度涡旋可以捕获和输送水柱中的叶绿素(CHL),卫星测量只能在海面观测到CHL。在这里,我们估计涡引起的CHL分布的卫星观测,Argo浮标测量,和全球经验模型的基础上。利用卫星高度计资料和Argo观测相结合的方法,通过跟踪最外层的位涡闭合等值线来探测涡旋边界,然后利用卫星观测的海表CHL和模式估算的CHL的垂直分布来反演涡旋边界内的CHL。结果表明,被涡旋捕获的CHL可达3.2 × 10 ~(12)g,约占海洋CHL总量的一半,全球时均CHL涡旋引起的纬向西输送可达5.7 × 10 ~(13)g/s。结果表明,海洋中尺度涡旋对海洋内部CHL的升高起着重要作用。
While mesoscale eddies can trap and transport chlorophyll (CHL) within the water columns, satellite measurements can only observe CHL at the sea surface. Here, we .estimate the eddy-induced CHL distribution based on satellite observations, Argo float measurements, and global empirical models. The combination of satellite .altimeter data and Argo measurements is used to detect eddy boundaries by tracking the outermost closed contours of potential vorticity (PV) at depth; then, sea .surface CHL from satellite observations, together with their vertical distributions estimated from models are used to derive the CHL within eddy boundaries. We find .that the CHL trapped by eddies can reach 3.2 × 1012g, which is about half of the total CHL in the ocean; the global time-mean CHL eddy-induced zonal transport adds .up to 5.7 × 103 g/s westward. The results show that oceanic mesoscale eddies play an important role in the elevated CHL in the interior of the ocean.
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