FerryBox-assisted monitoring of mixed layer pH in the Norwegian Coastal Current

Abstract The Norwegian coast is populated by two cod populations: Northeast Arctic cod and Norwegian Coastal cod. In this paper, we use a further division based on life history: oceanic cod, coastal cod, and fjord cod. A numerical ocean model was implemented for the northern Norwegian coast where all these populations have spawning areas. The model results were used to simulate connectivity and retention of cod eggs from the different subpopulations. The model reproduced the observed variability and mesoscale activity in the Norwegian Coastal Current. Eggs released at an oceanic spawning area were transported northwards along the coastline. Coastal cod eggs had intermediate connectivity with each other and fjord cod eggs had high local retention. Although the high retention of eggs in fjord areas is mainly caused by a subsurface distribution of eggs, the intermediate retention of eggs from coastal spawning areas is caused by small-scale eddies in-between many small islands. The high-resolution ocean model made it possible to reveal these specific dispersal patterns. The high retention of early life stages in fjords combined with strong homing to spawning areas indicates that fjord subpopulations may be described as a metapopulation.

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Whirls in the Norwegian Coastal Current

Coastal Oceanography ◽

10.1007/978-1-4615-6648-9_17 ◽

1983 ◽

pp. 311-320 ◽

Cited By ~ 4

Author(s):

T. A. McClimans ◽

J. H. Nilsen

Keyword(s):

Coastal Current ◽

Norwegian Coastal Current

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Characteristics of the Norwegian Coastal Current during Years with High Recruitment of Norwegian Spring Spawning Herring (Clupea harengus L.)

PLoS ONE ◽

10.1371/journal.pone.0144117 ◽

2015 ◽

Vol 10 (12) ◽

pp. e0144117 ◽

Cited By ~ 23

Author(s):

Øystein Skagseth ◽

Aril Slotte ◽

Erling Kåre Stenevik ◽

Richard D. M. Nash

Keyword(s):

Clupea Harengus ◽

Coastal Current ◽

Norwegian Coastal Current ◽

High Recruitment

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The use of Cs and Sr isotopes as tracers in the Arctic Mediterranean Seas

Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences ◽

10.1098/rsta.1988.0049 ◽

1988 ◽

Vol 325 (1583) ◽

pp. 161-176 ◽

Cited By ~ 36

Keyword(s):

Deep Water ◽

Thermohaline Circulation ◽

Atlantic Water ◽

The Arctic ◽

Coastal Current ◽

Intermediate Water ◽

Sr Isotopes ◽

Arctic Ice ◽

Norwegian Coastal Current

The Arctic Mediterranean Seas constitute an oceanic region in which the thermohaline circulation has a strong advective component and deep ventilation processes are very active relative to other oceanic areas. Details of the nature of these circulation and ventilation processes have been revealed through use of Cs and Sr isotopes from bomb-fallout and nuclear-waste sources as ocean tracers. In both cases, their regional input is dominated by advective supply in the Norwegian Atlantic Current and Norwegian Coastal Current, respectively. The different temporal, spatial, and compositional input patterns of these tracers have been used to study different facets of the regional circulation. These input differences and some representative applications of the use of these tracers are reviewed. The data discussed derive from samples collected both from research vessels and from Arctic ice camps. The topics addressed include: ( a ) the role of Arctic Intermediate Water as source, supplying recent surface water to North Atlantic Deep Water via the Denmark Strait overflow; ( b ) deep convective mixing in the Greenland Sea; ( c ) circulation or recirculation of Atlantic water in the Arctic basins; and ( d ) the role of Arctic shelfwaters in the ventilation of intermediate and deep water in the Eurasian and Canadian basins.

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Production, Grazing and Sedimentation in the Norwegian Coastal Current

The Role of Freshwater Outflow in Coastal Marine Ecosystems ◽

10.1007/978-3-642-70886-2_26 ◽

1986 ◽

pp. 361-374 ◽

Cited By ~ 12

Author(s):

Rolf Peinert

Keyword(s):

Coastal Current ◽

Norwegian Coastal Current

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On Abnormally Strong Currents Observed on the Northern Coast of Peru during the 2015-2016 El Niño

Korea Society of Coastal Disaster Prevention ◽

10.20481/kscdp.2021.8.4.205 ◽

2021 ◽

Vol 8 (4) ◽

pp. 205-210

Author(s):

Chang-Woong Shin ◽

Dimitri Gutiérrez

Keyword(s):

Mixed Layer ◽

El Niño ◽

El Nino ◽

Current Data ◽

Kelvin Waves ◽

Coastal Current ◽

Northern Coast ◽

El Niño Event ◽

Strong Current ◽

The Impact

The northern coast of Peru is a region that can rapidly detect the impact of an El Niño. To investigate the effects of the 2015-2016 El Niño on the oceanographic environment of the northern coast of Peru, the temperature and current data obtained from moored equipment at an oil platform were analyzed. Strong coastal along-shore currents of more than 0.60 m·s-1 were observed three times, although the mean current speed was 0.10 m·s-1 flowing toward the south-southwest. After the first strong current, the bottom temperature increased and the mixed layer deepened and remained there during the El Niño event. The temperature reached a maximum after the strong coastal current, then decreased gradually. An analysis of wind and sea surface height anomalies revealed that the coastal strong current was caused by Kelvin waves and the deepening of the mixed layer was not related to local winds, but to coastal Kelvin waves from the equator during the El Niño event.

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Inhibition of mixed-layer deepening during winter in the northeastern Arabian Sea by the West India Coastal Current

Climate Dynamics ◽

10.1007/s00382-015-2888-3 ◽

2015 ◽

Vol 47 (3-4) ◽

pp. 1049-1072 ◽

Cited By ~ 25

Author(s):

D. Shankar ◽

R. Remya ◽

P. N. Vinayachandran ◽

Abhisek Chatterjee ◽

Ambica Behera

Keyword(s):

Mixed Layer ◽

Arabian Sea ◽

Coastal Current ◽

The West

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Origins of Coupled Model Biases in the Arabian Sea Climatological State

Journal of Climate ◽

10.1175/jcli-d-17-0417.1 ◽

2018 ◽

Vol 31 (5) ◽

pp. 2005-2029 ◽

Cited By ~ 4

Author(s):

Motoki Nagura ◽

J. P. McCreary ◽

H. Annamalai

Keyword(s):

Mixed Layer ◽

Persian Gulf ◽

Arabian Sea ◽

Coupled Model ◽

Sea Surface Salinity ◽

Western Boundary ◽

Coastal Current ◽

Surface Cooling ◽

Surface Salinity ◽

High Salinity Water

This study investigates biases of the climatological mean state of the northern Arabian Sea (NAS) in 31 coupled ocean–atmosphere models. The focus is to understand the cause of the large biases in the depth of the 20°C isotherm [Formula: see text] that occur in many of them. Other prominent biases are the depth [Formula: see text] and temperature [Formula: see text] of Persian Gulf water (PGW) and the wintertime mixed-layer thickness (MLT) along the northern boundary. For models that lack a Persian Gulf (group 1), [Formula: see text] is determined by the wintertime MLT bias [Formula: see text] through the formation of an Arabian Sea high-salinity water mass (ASHSW) that is too deep. For models with a Persian Gulf (group 2), if [Formula: see text] > MLT (group 2B), PGW remains mostly trapped to the western boundary and, again, [Formula: see text] directly controls [Formula: see text]. If [Formula: see text] MLT (group 2A), PGW spreads into the NAS and impacts [Formula: see text] because [Formula: see text] > 20°C; nevertheless [Formula: see text] still influences [Formula: see text] indirectly through its impact on [Formula: see text]. The thick wintertime mixed layer is driven primarily by surface cooling [Formula: see text] during the fall. Nevertheless, variations in ΔMLT among the models are more strongly linked to biases in the density stratification (jump) across the bottom of the mixed layer than to [Formula: see text] biases. The jump is in turn determined primarily by sea surface salinity biases (ΔSSS) advected into the NAS by the West India Coastal Current, and the source of ΔSSS is the rainfall deficit associated with the models’ weak summer monsoon. Ultimately, then, ΔD20 is linked to this deficit.

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