Oceanography and fluorescence at the shelf break off the north Norwegian coast (69°′N-70°30′N) during the main productive period in 1994

Sarsia ◽  
1999 ◽  
Vol 84 (3-4) ◽  
pp. 175-189 ◽  
Author(s):  
Eirik Nordby ◽  
Kurt S. Tande ◽  
Harald Svendsen ◽  
Dag Slagstad ◽  
Ulf Båmstedt
Keyword(s):  
Shelf Break ◽  
Norwegian Coast ◽  
The North

scholarly journals Notes on the Didemnidae (Ascidiacea): I. The presence of Didemnum (Leptoclinides) faeröense (Bjerkan) in the Plymouth area

1954 ◽  
Vol 33 (1) ◽  
pp. 21-25 ◽  
Author(s):  
D. B. Carlisle ◽  
A. I. Carlisle
Keyword(s):  
Atlantic Ocean ◽  
North American ◽  
Spring Tide ◽  
Boreal Species ◽  
Norwegian Coast ◽  
The North ◽  
Sublittoral Zone

Leptoclinides faeröensis Bjerkan (1905) is a little-known boreal species which has been found only in the Atlantic Ocean (Fig. I). The most northerly record is from a little south of Spitzbergen, the most southerly from 37° 08' N., off the North American coast. It occurs on the coast of Norway and in the Faeroe Islands, but it has not been reported nearer to Plymouth than these two localities. Most records are from deepish waters, though it occurs in the sublittoral zone along the Norwegian coast. It was in this zone, at Looe Island (50' 20' 24“ N., 4 °26' 53” W.) near Plymouth, that we found a specimen of this species growing on a rock about 80 cm. below O.D.—just sufficiently low for it to remain covered by a few centimetres of water at the lowest tide of the year, the equinoctial spring tide.

scholarly journals Why do jellyfish bloom in Norwegian waters and what can be done to recover the ecosystems in the North Sea and on the Norwegian coast?

2017 ◽  
Author(s):  
Johannes Hamre
Keyword(s):  
North Sea ◽  
West Coast ◽  
Trophic Levels ◽  
The West ◽  
Fish Stocks ◽  
Norwegian Coast ◽  
The North ◽  
Key Species ◽  
Wide Range ◽  
The North Sea

The ecosystems with their relationships between fish species and stocks, have been established by evolution for millions of years, but during the last 50 years, the ecosystems in the North Sea and along the Norwegian coast have been changed fundamentally by fisheries. The North Sea mackerel stock has been depleted and its feeding grounds have been invaded by the Western mackerel which spawns west of Ireland. This stock is now very rich in numbers and occupies the North Sea, the Norwegian Sea and the western Barents Sea. If the trend continues, mackerel may outcompete many of the other fish stocks in the area. Traditionally and until the beginning of the 1970s, there was a large stock of sandeel spawning in the North Sea and on the Norwegian coast. Sandeel juveniles was an important food source for a wide range of species, including sea mammals and birds. The fact that this stock has also been overfished, may explain many changes observed in the ecosystem on the west coast of Norway, for example a large reduction in the populations of sea birds. There are several instances where ecosystems shift to sustain jellyfish blooms in response to depletion of forage fish stocks. This was registered in Namibia in the 1990’s, where the pilchard stock was decimated and the biomass of jellyfish soon became overwhelming. On the west-coast of Norway, there are now frequent blooms of jellyfish, yet another indication that a controlling factor is missing in the system, in this case sandeel, which is a key species in the transfer of nutrients from zooplankton to higher trophic levels in the area. In this paper, I give a description of the situation and some suggested measures that should be taken in fisheries management.

Spreading dynamics of central Labrador and Irminger Sea Waters

2020 ◽  
Author(s):  
Patricia Handmann ◽  
Martin Visbeck ◽  
Arne Biastoch
Keyword(s):  
High Resolution ◽  
Ocean Model ◽  
Shelf Break ◽  
Labrador Sea ◽  
Mean Velocity ◽  
The North ◽  
Irminger Sea ◽  
First Results ◽  
Resolution Model ◽  
High Resolution Model

<p>Water mass formation in the Subpolar North Atlantic and successive southward export, connects high latitudes with lower latitudes, as a part of the lower Atlantic meridional overturning (AMOC) limb. The role of regional importance, in particular the respective roles of the Labrador and Irminger Sea, in this process are in debate. </p><p>This study analyses pathways connecting the Labrador and Irminger Sea in detail, using simulated Lagrangian particle trajectories. To give further insight on interconnectivity and flow patterns we used two setups with different velocity fields, a high-resolution ocean model (VIKING20X) and a gridded Argo float displacement climatology. Both setups indicate two distinct pathways with interconnectivity on the order of 20% of the total amount of seeded particles between the Labrador Sea and Irminger Sea. One pathway is following the recirculation in the Labrador Sea along the Greenland shelf break; the other is along the Newfoundland shelf break turning to the north/northwest at the Orphan-Knoll region towards the central Irminger Sea. For the Argo based advective-diffusive particle trajectory integration a 2.5–3.5 year travel time scale was derived between the Labrador and the Irminger Sea, while the experiments with the temporarily varying high-resolution model output revealed significantly shorter spreading times of about 1.5–2 years. While both pathways are represented in either setup, the pathway following the Newfoundland shelf break is populated stronger in the model-based experiments. In general we found that connectivity between the two regions is weaker in the experiments based on the climatological mean velocity output of the model than in those based on the Argo derived fields, first results indicate that this is due to stronger boundary currents and a weaker recirculation in the Labrador Sea.</p>

scholarly journals On the tides, bed and coasts of the North Sea or German Ocean

1854 ◽  
Vol 6 ◽  
pp. 201-202
Keyword(s):  
The Netherlands ◽  
North Sea ◽  
The Other ◽  
Great Similarity ◽  
Shetland Islands ◽  
Norwegian Coast ◽  
The North ◽  
The North Sea ◽  
The Baltic ◽  
Long Channel

The author commences his paper by remarking that great similarity of outline pervades the western shores of Ireland, Scotland and Norway, and then observes that the great Atlantic flood-tide wave, having traversed the shores of the former countries, strikes with great fury the Norwegian coast between the Lafoden Isles and Stadland, one portion proceeding to the north, while the other is deflected to the south, which last has scooped out along the coast, as far as the Sleeve at the mouth of the Baltic, a long channel from 100 to 200 fathoms in depth, almost close in shore, and varying from 50 to 100 miles in width. After describing his method of contouring and colouring the Admiralty chart of the North Sea, he traces the course of the tide-wave among the Orkney and Shetland Islands along the eastern shores of Scotland and England to the Straits of Dover, and along the western shores of Norway, Denmark and the Netherlands, to the same point.

Oil Rig Disaster in the North Sea

1985 ◽  
Vol 1 (S1) ◽  
pp. 357-359
Author(s):  
Helge Bryne ◽  
Eilif Dahl
Keyword(s):  
North Sea ◽  
Oil Production ◽  
Oil Field ◽  
Mobile Platform ◽  
Norwegian Coast ◽  
Drilling Rig ◽  
The North ◽  
Production Platform ◽  
The North Sea ◽  
Oil Rig

Since oil was found under the North Sea in the mid 1960's, oil production now plays an important part in Norwegian economy. A major oil field isEkofisk, between Norway and Britain (Figure 1). TheAlexander Kielland, one of the rigs atEkofisk, was a mobile platform of the pentagon type, floating on 5 columns, 150 nautical miles of f the Norwegian coast. It was developed and built as a drilling rig, but was used as an accommodation platform since delivery in July 1976. OnMarch27,1980, theAlexander Kiellandrig lay at anchor on theEkofisk field, close to the production platform EDDA.

scholarly journals Status of grey seals (Halichoerus grypus) in Norway

2007 ◽  
Vol 6 ◽  
pp. 23 ◽  
Author(s):  
Kjell Tormod Nilssen ◽  
Tore Haug
Keyword(s):  
Total Population ◽  
Halichoerus Grypus ◽  
Population Estimates ◽  
Grey Seal ◽  
Breeding Area ◽  
Breeding Sites ◽  
Norwegian Coast ◽  
The North ◽  
Minimum Estimate ◽  
Pup Mortality

During the period September-December in 2001-2003, ship based surveys of grey seal (Halichoerus grypus) pups, including tagging, counting and staging of pups, were conducted along the Norwegian coast. All known and other potential breeding areas were surveyed from Rogaland county in the south to Finnmark county in the north. Most of the breeding sites were surveyed only once, but some sites were surveyed 2-4 times. The investigations resulted in a total minimum estimate of 1,159 grey seal pups born in Norwegian waters. Nordland county was the most important breeding area where about 50% of the pups were born. Total population estimates were derived from the recorded number of pups born using a range of multipliers (4.0-4.7), based on observed annual growth rates of approximately 7-12% in other grey seal populations. This gave a total estimate of about 5,800-6,600 grey seals including pups in Norwegian waters. However, the total pup production was probably underestimated due to only one pup count in most of the breeding sites. Observed mean pup mortality was 1.1% during the breeding season along the Norwegian coast.

Impact of climate variations on the north-east Atlantic shelf-break systems: Lessons from a recent past

2009 ◽  
Vol 6 (9) ◽  
pp. 092019
Author(s):  
Ilaria Nardello ◽  
C Lynam ◽  
C Cusack ◽  
H Cannaby ◽  
G Nolan ◽  
...  
Keyword(s):  
Shelf Break ◽  
Climate Variations ◽  
Recent Past ◽  
East Atlantic ◽  
North East ◽  
The North
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