Dynamical controls of the eastward transport of overwintering Calanus finmarchicus from the Lofoten Basin to the Continental Slope
Dynamical controls of the eastward transport of overwintering Calanus finmarchicus from the Lofoten Basin to the Continental Slope
Date
2022-09-06
Authors
Dong, Huizi
Zhou, Meng
Smith, Walker O.
Li, Baosheng
Hu, Ziyuan
Basedow, Sünnje L.
Gaardsted, Frank
Zhang, Zhaoru
Zhong, Yisen
Zhou, Meng
Smith, Walker O.
Li, Baosheng
Hu, Ziyuan
Basedow, Sünnje L.
Gaardsted, Frank
Zhang, Zhaoru
Zhong, Yisen
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10.1029/2022JC018909
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Abstract
iapausing populations of Calanus finmarchicus at depth in the Lofoten Basin (LB) return to the continental shelf and slope off the Lofoten-Vesterålen Islands during the phytoplankton spring bloom to feed and spawn, forming surface swarms with a great abundance. To study how overwintering populations of C. finmarchicus move with the deep currents and return to the shelf, Lagrangian transport characteristics of particles in deep water between 2008 and 2019 were analyzed using Global Ocean Reanalysis and Simulation re-analysis data and Lagrangian Coherent Structures (LCSs). Our analyses revealed that persistent eastward transport of diapausing C. finmarchicus between LB and continental slope occurred mainly between 600 and 1,100 m in the Arctic Intermediate Water. The consistency of the vertical distributions of C. finmarchicus abundance and salinity further suggests that physical factors control the horizontal distribution of the species. Hovmöller diagrams of kinetic energy indicate that there is an eastward advection of mean current at depth. The co-occurrence between the eastward transport of LCSs and the eastward advection of the mean current provides direct evidence that the life history of C. finmarchicus is subjected to physical control in the Norwegian Sea.
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© The Author(s), 2022 This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Dong, H., Zhou, M., Smith, W. O., Li, B., Hu, Z., Basedow, S. L., Gaardsted, F., Zhang, Z., & Zhong, Y. Dynamical controls of the eastward transport of overwintering Calanus finmarchicus from the Lofoten Basin to the Continental Slope. Journal of Geophysical Research: Oceans, 127(9), (2022): e2022JC018909, https://doi.org/10.1029/2022JC018909.
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Dong, H., Zhou, M., Smith, W. O., Li, B., Hu, Z., Basedow, S. L., Gaardsted, F., Zhang, Z., & Zhong, Y. (2022). Dynamical controls of the eastward transport of overwintering Calanus finmarchicus from the Lofoten Basin to the Continental Slope. Journal of Geophysical Research: Oceans, 127(9), e2022JC018909.