Postglacial paleoceanology of the Barents sea

2021 ◽  
pp. 109-126
Author(s):  
E.V. Ivanova ◽  
◽  
I.O. Murdmaa ◽  
Keyword(s):  
Thermohaline Circulation ◽  
Barents Sea ◽  
Early Stage ◽  
Ice Sheet ◽  
Atlantic Water ◽  
Water Inflow ◽  
Published Data ◽  
The Holocene ◽  
The Barents Sea ◽  
The Last Glacial Maximum

The Chapter presents reconstructions of ice sheet boundaries, surface- and bottom-water environments in the Barents Sea for several postglacial intervals. The evolution of the basin during deglaciation is considered in relation to climate changes in the Northern Hemisphere and variations in the intensity of Atlantic water inflow from the last glacial maximum to the Holocene. Particular attention is paid to changes in the dominant sedimentation processes and to diachronous character of deglaciation. Reconstructions are based on our own (more than 30 deep-sea cores) and published data with the account for the available regional schemes of deglaciation. The early stage of degradation of the Scandinavian-Barents Sea ice sheet was completed by the beginning of the Bølling-Allerød interstadial. This warming was characterized by a significant increase in the Atlantic water penetration in the Barents Sea linked to a re-organization of global thermohaline circulation. The new increases in the Atlantic water inflow into shelf depressions occurred at the end of Younger Dryas and in Preboreal. In the Holocene, glaciomarine sedimentation was replaced by the marine hemipelagic one in the deep troughs and depressions.

Impact of Atlantic water inflow on winter cyclone activity in the Barents Sea: Insights from coupled regional climate model simulations

2020 ◽  
Author(s):  
Mirseid Akperov ◽  
Vladimir A. Semenov ◽  
Igor I. Mokhov ◽  
Wolfgang Dorn ◽  
Annette Rinke
Keyword(s):  
Climate Model ◽  
Barents Sea ◽  
Regional Climate ◽  
Lower Troposphere ◽  
Static Stability ◽  
Atlantic Water ◽  
Water Inflow ◽  
Cyclone Activity ◽  
The Barents Sea ◽  
The Impact

<p>The impact of the Atlantic water inflow (AW inflow) into the Barents Sea on the regional cyclone activity in winter is analyzed in 10 ensemble simulations with the coupled Arctic atmosphere-ocean-sea ice model HIRHAM-NAOSIM for the 1979–2016 period. The model shows a statistically robust connection between AW inflow and climate variability in the Barents Sea. The analysis reveals that anomalously high AW inflow leads to changed baroclinicity in the lower troposphere via changed static stability and wind shear, and thus favorable conditions for cyclogenesis in the Barents/Kara Seas. The frequency of occurrence of cyclones, but particularly of intense cyclones, is increased over the Barents Sea. Furthermore, the cyclones in the Barents Sea become larger (increased radius) and stronger (increased intensity) in response to an increased AW inflow into the Barents Sea, compared to years of anomalously low AW inflow.</p><p>The authors acknowledge the support by the Russian-German project funded by the Federal Ministry of Education and Research of Germany and Ministry of Science and Higher Education of the Russian Federation (grant 05.616.21.0109 (RFMEFI61619X0109)).</p>

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

1998 ◽  
Vol 17 (1-3) ◽  
pp. 43-75 ◽  
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

scholarly journals Atlantic water inflow to Labrador Sea and its interaction with ice sheet dynamics during the Holocene

2021 ◽  
Vol 256 ◽  
pp. 106833
Author(s):  
Jens Weiser ◽  
Jürgen Titschack ◽  
Markus Kienast ◽  
Ian Nicholas McCave ◽  
Annalena Antonia Lochte ◽  
...  
Keyword(s):  
Ice Sheet ◽  
Atlantic Water ◽  
Water Inflow ◽  
Labrador Sea ◽  
The Holocene ◽  
Ice Sheet Dynamics

scholarly journals Paleoceanography of the Barents Sea during the Holocene

2005 ◽  
Vol 20 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
J. C. Duplessy ◽  
E. Cortijo ◽  
E. Ivanova ◽  
T. Khusid ◽  
L. Labeyrie ◽  
...  
Keyword(s):  
Barents Sea ◽  
The Holocene ◽  
The Barents Sea

scholarly journals Transformation of Atlantic Water in the north-eastern Barents Sea in winter

2020 ◽  
Vol 66 (3) ◽  
pp. 246-266
Author(s):  
V. V. Ivanov ◽  
I. E. Frolov ◽  
K. V. Filchuk
Keyword(s):  
Barents Sea ◽  
Cold Season ◽  
Atlantic Water ◽  
High Concentration ◽  
The North ◽  
Driving Mechanisms ◽  
The Barents Sea ◽  
Open Sea ◽  
North Eastern ◽  
Transformation Mechanisms

Hydrographic observations, carried out in March-May, 2019 during “Transarktika-2019” expedition onboard R/V “Akademik Tryoshnikov” allowed studying mechanisms of Atlantic Water (AW) transformation in the Barents Sea. Although this research topic is rather traditional for oceanographic studies, there are still a number of questions, which require clarification. Among these is a deeper understanding of the AW transformation in specific regions in cold season, when the coverage by observations is scarce. In this study we performed temperature and salinity (TS) analysis of conductivity — temperature — depth (CTD) data, collected in the north-eastern “corner” of the Barents Sea — this is the area with difficult access in winter due to high concentration of pack ice. The results allowed identification of areas along the pathways of AW branches, where various types of open sea convection and cascading acted as dominant processes of AW properties change. We distinguish several driving mechanisms controlling modification of the waters of Atlantic origin. An advantage of winter measurements is that the active stage of AW transformation mechanisms is explicitly observed at the consecutive CTD sections.

Palynological evidence of sea-surface conditions in the Barents Sea off northeast Svalbard during the postglacial period

2020 ◽  
pp. 1-15
Author(s):  
Camille Brice ◽  
Anne de Vernal ◽  
Elena Ivanova ◽  
Simon van Bellen ◽  
Nicolas Van Nieuwenhove
Keyword(s):  
Sea Ice ◽  
Surface Waters ◽  
Barents Sea ◽  
Ice Cover ◽  
Atlantic Water ◽  
Transitional Period ◽  
Sea Surface ◽  
Sea Surface Salinity ◽  
Surface Conditions ◽  
The Barents Sea

Abstract Postglacial changes in sea-surface conditions, including sea-ice cover, summer temperature, salinity, and productivity were reconstructed from the analyses of dinocyst assemblages in core S2528 collected in the northwestern Barents Sea. The results show glaciomarine-type conditions until about 11,300 ± 300 cal yr BP and limited influence of Atlantic water at the surface into the Barents Sea possibly due to the proximity of the Svalbard-Barents Sea ice sheet. This was followed by a transitional period generally characterized by cold conditions with dense sea-ice cover and low-salinity pulses likely related to episodic freshwater or meltwater discharge, which lasted until 8700 ± 700 cal yr BP. The onset of “interglacial” conditions in surface waters was marked by a major change in dinocyst assemblages, from dominant heterotrophic to dominant phototrophic taxa. Until 4100 ± 150 cal yr BP, however, sea-surface conditions remained cold, while sea-surface salinity and sea-ice cover recorded large amplitude variations. By ~4000 cal yr BP optimum sea-surface temperature of up to 4°C in summer and maximum salinity of ~34 psu suggest enhanced influence of Atlantic water, and productivity reached up to 150 gC/m2/yr. After 2200 ± 1300 cal yr BP, a distinct cooling trend accompanied by sea-ice spreading characterized surface waters. Hence, during the Holocene, with exception of an interval spanning about 4000 to 2000 cal yr BP, the northern Barents Sea experienced harsh environments, relatively low productivity, and unstable conditions probably unsuitable for human settlements.

scholarly journals Episodic Atlantic Water Inflow Into the Independence Fjord System (Eastern North Greenland) During the Holocene and Last Glacial Period

2020 ◽  
Vol 8 ◽  
Author(s):  
Nicolas Van Nieuwenhove ◽  
Audrey Limoges ◽  
Niels Nørgaard-Pedersen ◽  
Marit-Solveig Seidenkrantz ◽  
Sofia Ribeiro
Keyword(s):  
Atlantic Water ◽  
Water Inflow ◽  
Glacial Period ◽  
Last Glacial Period ◽  
The Holocene ◽  
Last Glacial ◽  
Fjord System ◽  
North Greenland

scholarly journals Comparison of the biophysical and trophic characteristics of the Bering and Barents Seas

2005 ◽  
Vol 62 (7) ◽  
pp. 1245-1255 ◽  
Author(s):  
George L. Hunt ◽  
Bernard A. Megrey
Keyword(s):  
Bering Sea ◽  
Barents Sea ◽  
Single Species ◽  
Atlantic Water ◽  
Walleye Pollock ◽  
Fish Stocks ◽  
Eastern Bering Sea ◽  
The Barents Sea ◽  
Shelf Seas ◽  
Bottom Waters

Abstract The eastern Bering Sea and the Barents Sea share a number of common biophysical characteristics. For example, both are seasonally ice-covered, high-latitude, shelf seas, dependent on advection for heat and for replenishment of nutrients on their shelves, and with ecosystems dominated by a single species of gadoid fish. At the same time, they differ in important respects. In the Barents Sea, advection of Atlantic Water is important for zooplankton vital to the Barents Sea productivity. Advection of zooplankton is not as important for the ecosystems of the southeastern Bering Sea, where high levels of diatom production can support production of small, neritic zooplankton. In the Barents Sea, cod are the dominant gadoid, and juvenile and older fish depend on capelin and other forage fish to repackage the energy available in copepods. In contrast, the dominant fish in the eastern Bering Sea is the walleye pollock, juveniles and adults of which consume zooplankton directly. The southeastern Bering Sea supports considerably larger fish stocks than the Barents. In part, this may reflect the greater depth of much of the Barents Sea compared with the shallow shelf of the southeastern Bering. However, walleye pollock is estimated to occupy a trophic level of 3.3 as compared to 4.3 for Barents Sea cod. This difference alone could have a major impact on the abilities of these seas to support a large biomass of gadoids. In both seas, climate-forced variability in advection and sea-ice cover can potentially have major effects on the productivity of these Subarctic seas. In the Bering Sea, the size and location of pools of cold bottom waters on the shelf may influence the likelihood of predation of juvenile pollock.

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