Chlorinated hydrocarbons in seabirds from the Barents Sea area

Abstract. The origin of flowering plants is still a matter of dispute. Several lines of evidence suggest that their origin may go back to the Triassic. This paper reports on pollen grains with angiosperm-like morphologies from marine Middle Triassic sediments of the Boreal Realm (Norwegian Arctic, Barents Sea area). The morphology of these pollen grains is comparable to forms recorded from the Early Cretaceous, which are generally attributed to angiosperms. The new finds of angiosperm-like pollen are the earliest in the fossil record so far and show an astonishing high diversity. In contrast to other early records, they come from high palaeolatitudes with an inferred warm-temperate climate. The new finds suggest the presence of the first angiosperms during the Middle Triassic (242–227 Ma) or, alternatively, provide evidence for an as-yet unknown group of gymnosperms, possibly an extinct sister group of the flowering plants.

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Chapter 11 Southern Svalbard:Bjørnøya and submarine geology

Geological Society London Memoirs ◽

10.1144/gsl.mem.1997.017.01.11 ◽

1997 ◽

Vol 17 (1) ◽

pp. 209-226 ◽

Cited By ~ 2

Author(s):

W. Brian Harland ◽

Isobel Geddes ◽

Paul A. Doubleday

Keyword(s):

Sea Ice ◽

Barents Sea ◽

Small Island ◽

Norwegian Sea ◽

The North ◽

The Barents Sea ◽

Shallow Area ◽

Sea Area

The area south of Spitsbergen (about 76°31'N) to latitude 74°N, and between longitudes 10°E and 35°E, by which Svalbard was first defined, contains the small island of Bjørnøya (Bear Island, Bären Insel) and the rest is sea (Fig. 11.1).The 500 m isobath conveniently separates the edge of the Barents shelf from the Norwegian Sea Basin which runs south from Spitsbergen between 14° and 16°30'E. To the east, the large shallow area, Spitsbergenbanken, less than 100 m deep, supports Bjørnøya at its southwestern end, extends northeast to Hopen and joins Edge°ya. It is separated from Spitsbergen to the north by the Storfjordyrenna and to the east by Hopendjupet. These submarine valleys appear to drain westwards into the ocean deep with deltaic fronts convex westward.This chapter focuses first on Bjørnøya which though small is a key outcrop in the Barents Sea and distinct in many respects from Spitsbergen being about 250 km distant. The chapter then surveys a little of what is known of the surrounding sub-sea area.Bjørnøya (20 km N-S and 15 km E-W), as the southern outpost of Svalbard, has long been a key to Svalbard geology since it is generally free all year from tight sea ice. But though its location is convenient, its cliffs generally bar access. Indeed there are very few places where landing by other than inflatable dinghy are feasible. After the island had been claimed by a Norwegian syndicate in 1915 mining of Tournaisian coal began in 1916 and exported over 116000

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High Geostress Advantageous for Arctic Field Developments

Volume 8: Polar and Arctic Sciences and Technology; Petroleum Technology ◽

10.1115/omae2018-78629 ◽

2018 ◽

Author(s):

Bernt S. Aadnøy ◽

Mesfin A. Belayneh

Keyword(s):

Stress State ◽

North Sea ◽

Barents Sea ◽

Wellbore Stability ◽

The Arctic ◽

Positive Effects ◽

The North ◽

The Barents Sea ◽

The North Sea ◽

Sea Area

The Arctic areas of Norway has brought many new challenges. In addition to harsh weather, drilling conditions are different. The Barents Sea is different geologically compared to the North Sea area. A considerable amount of erosion bring older rocks higher up. It is observed that leak-off tests measured in Barents Sea wells shows abnormally high values. This is interpreted as a high stress state. The paper analyze the stresses around a number of wells and conclude that it is very likely that a reverse fault stress state exists in these areas of the Barents Sea. This can bring positive effects because such a stress state may constrain induced fractures to propagate in a horizontal plane rather than towards surface, reducing the risk for reservoir leaks to surface. Also, a high compressive state may lead to more sealed faults, indicating a higher possibility for oil in place. The paper will present the stress model and compare Barent Sea area to the North Sea. It will also show implications for wellbore stability, leaks from reservoirs and effects on sealing of major faults. Of particular interest is that leak potential from the reservoir is reduced in the Barent Sea as compared to other Norwegian oil fields. This may encourage more development in the Arctic areas.

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THE LAST GLACIAL MAXIMUM OF SVALBARD AND THE BARENTS SEA AREA: ICE SHEET EXTENT AND CONFIGURATION

Quaternary Science Reviews ◽

10.1016/s0277-3791(97)00066-8 ◽

1998 ◽

Vol 17 (1-3) ◽

pp. 43-75 ◽

Cited By ~ 280

Author(s):

JON Y. LANDVIK ◽

STEIN BONDEVIK ◽

ANDERS ELVERHØI ◽

WILLY FJELDSKAAR ◽

JAN MANGERUD ◽

...

Keyword(s):

Last Glacial Maximum ◽

Barents Sea ◽

Ice Sheet ◽

Glacial Maximum ◽

Last Glacial ◽

The Barents Sea ◽

Sea Area ◽

The Last Glacial Maximum ◽

The Last Glacial

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Some Factors Affecting the Extent of Ice in the Barents Sea Area

ARCTIC ◽

10.14430/arctic3799 ◽

1956 ◽

Vol 9 (4) ◽

Cited By ~ 1

Author(s):

Francis E. Elliott

Keyword(s):

Barents Sea ◽

Factors Affecting ◽

The Barents Sea ◽

Sea Area

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Heavy metals and black carbon in the atmosphere over the Barents sea: concentrations and fluxes onto the surface

10.29006/978-5-6045110-0-8/(12) ◽

2021 ◽

pp. 142-152

Author(s):

A.A. Vinogradova ◽

◽

E.I. Kotova ◽

Yu.A. Ivanova ◽

◽

...

Keyword(s):

Heavy Metals ◽

Black Carbon ◽

Barents Sea ◽

Spatial Variations ◽

Near Surface ◽

Lead And Cadmium ◽

The Barents Sea ◽

The Mean ◽

Sea Area ◽

Sea Coast

Estimates of the fluxes of anthropogenic heavy metals (HM) – Pb, Cd, As, Zn, Ni, Cr, Cu – from the atmosphere onto the surface of the Barents Sea are based on previously calculated concentrations of these elements in near-surface atmosphere at three points of the Sea coast (on Kola Peninsula, in Nenets Nature Reserve, on Frantz-Josef Land archipelago). For lead and cadmium, the contributions of their anthropogenic emissions in foreign Europe, as well as of windblowing dust and soil particles have been taking into account(from EMEP reports). About 50% of lead and about 40% of cadmium come from those sources to the whole Sea area. In general, the atmosphere supplies yearly only a fraction of percent of HMs containing in the Barents Sea waters. In spring, during the period of ice melting, the atmospheric contribution to HM concentrations in Sea waters may be 2-10 times higher than average annual values. Also, we studied the spatial variations of black carbon (BC) contentin the atmosphere over the Barents Sea based on satellite data (reanalysis MERRA-2).The mean BC fluxes onto the snowed surface, and respective amendments the surface albedo and its radiation forcing were estimatedfor three regions under investigation.

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