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Deep sea records from the southeast Labrador Sea: Ocean circulation changes and ice-rafting events during the last 160,000 years ArchiMer
Rasmussen, Tl; Oppo, Dw; Thomsen, E; Lehman, Sj.
[1] Results from two deep sea cores from northeast of Newfoundland at 1251 and 2527 m water depth, respectively, indicate that during the time period from 160,000 to 10,000 years BP, ice rafting events in the Labrador Sea were accompanied by rapid variations in deep and surface water circulation. Twelve ice-rafting events occurred, each coinciding with high concentrations of detrital carbonate and oxygen isotopic depletion of both surface and bottom waters. Eleven of these can be correlated with the North Atlantic Heinrich events H1-H11. The remaining very conspicuous ice-rafting event took place early in MIS substage 5e, at a time when the planktic faunal assemblage suggests marked warming of the sea surface. In the shallower core, benthic delta(13)C...
Tipo: Text Palavras-chave: Paleoceanography; Labrador Sea; Ice rafting; Foraminifera; Last climate cycle.
Ano: 2003 URL: https://archimer.ifremer.fr/doc/00496/60768/65083.pdf
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Oxygen Saturation Surrounding Deep Water Formation Events in the Labrador Sea From Argo-O-2 Data ArchiMer
Wolf, Mitchell K.; Hamme, Roberta C.; Gilbert, Denis; Yashayaev, Igor; Thierry, Virginie.
Deep water formation supplies oxygen-rich water to the deep sea, spreading throughout the ocean by means of the global thermohaline circulation. Models suggest that dissolved gases in newly formed deep water do not come to equilibrium with the atmosphere. However, direct measurements during wintertime convection are scarce, and the controls over the extent of these disequilibria are poorly quantified. Here we show that, when convection reached deeper than 800 m, oxygen in the Labrador Sea was consistently undersaturated at -6.1% to -7.6% at the end of convection. Deeper convection resulted in greater undersaturation, while convection ending later in the year resulted in values closer to equilibrium, from which we produce a predictive relationship. We use...
Tipo: Text Palavras-chave: Oxygen saturation; Convection; Argo; Labrador Sea; Deep water formation.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00442/55329/56829.pdf
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Sources, cycling and transfer of mercury in the Labrador Sea (Geotraces -Geovide cruise) ArchiMer
Cossa, Daniel; Heimburger, L. E.; Sonke, J. E.; Planquette, H.; Lherminier, Pascale; Garcia-ibanez, Maria Isabel; Perez, Ff; Sarthou, G..
The Labrador Sea links the Arctic and North Atlantic oceans and constitutes one of the main entrances of atmospheric inputs into the Ocean's interior. We report here the first high-resolution Hg distribution pattern along a transect from Greenland to Labrador coasts sampled after the 2014 winter convection. Total Hg concentrations in unfiltered (HgTUNF) samples ranged from 0.25 pmol L− 1 to 0.67 pmol L− 1 averaging 0.44 ± 0.10 pmol L− 1 (n = 113, 1σ). Concentrations in filtered samples (HgTF, < 0.45 μm) represented from 62 to 92% of the HgTUNF and exhibited a similar distribution. High HgTUNF concentrations were found (i) in the waters of the Labrador Current, which receive desalted waters from the Canadian Arctic Archipelago, and (ii) in the waters...
Tipo: Text Palavras-chave: Labrador Sea; Mercury; North Atlantic.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00411/52207/52929.pdf
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Towards an understanding of Labrador Sea salinity drift in eddy-permitting simulations ArchiMer
Rattan, Sanjay; Myers, Paul G.; Treguier, Anne-marie; Theetten, Sebastien; Biastoch, Arne; Boening, Claus.
Model drift in the Labrador Sea in eddy permitting model simulations is examined using a series of configurations based on the NEMO numerical framework. There are two phases of the drift that we can identify, beginning with an initial rapid 3-year period, associated with the adjustment of the model from its initial conditions followed by an extended model drift/adjustment that continued for at least another decade. The drift controlled the model salinity in the Labrador Sea, over-riding the variability. Thus, during this initial period, similar behavior was observed between the inter-annually forced experiments as with perpetual year forcing. The results also did not depend on whether the configuration was global, or regional North Atlantic Ocean. The...
Tipo: Text Palavras-chave: Numerical modelling; Labrador Sea; Model salinity drift; Boundary currents; Eddy-permitting models.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00013/12411/9226.pdf
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