Analysis of trace metals in bottom sediments in support of deep water biological processes studies on the U.S. North Atlantic continental slope and rise

1987 ◽  
Author(s):  
Michael H. Bothner ◽  
E.Y. Campbell ◽  
C.M. Parmenter ◽  
W. Dangelo ◽  
G.P. DiLisio ◽  
...  
Keyword(s):  
Trace Metals ◽  
Continental Slope ◽  
Bottom Sediments ◽  
North Atlantic ◽  
Deep Water ◽  
Biological Processes ◽  
The U.S

scholarly journals Analysis of trace metals in bottom sediments in support of deepwater biological processes studies on the U.S. Mid-Atlantic continental slope and rise

1987 ◽  
Author(s):  
Michael H. Bothner ◽  
E.Y. Campbell ◽  
G.P. DiLisio ◽  
C.M. Parmenter ◽  
R. R. Rendigs ◽  
...  
Keyword(s):  
Trace Metals ◽  
Continental Slope ◽  
Bottom Sediments ◽  
Biological Processes ◽  
The U.S

Diatoms and aquatic palynomorphs in the Barents sea sediments: main distribution patterns and use in palaeoceanological studies

2021 ◽  
pp. 64-95
Author(s):  
Ye.I. Polyakova ◽  
◽  
E.A. Novichkova ◽  
E.A. Agafonova ◽  
◽  
...  
Keyword(s):  
Sea Ice ◽  
Continental Slope ◽  
Bottom Sediments ◽  
North Atlantic ◽  
Distinctive Feature ◽  
Barents Sea ◽  
Distribution Patterns ◽  
Diatom Algae ◽  
The Barents Sea ◽  
Sedimentation Conditions

The Chapter deals with the uniqueness of the Barents Sea and adjacent sea areas from the viewpoint of the main groups of phytoplankton (diatom algae and dinoflagellate) development and their reflection in tanatocenoses of bottom sediments. Special attention is paid to the distribution of microfossils in surface waters as an indicator of the modern sea ice and hydrological signal. A distinctive feature of the Barents Sea tanatocenoses is the frequency of re-deposited Paleogene and Cretaceous forms of diatoms and dinocysts. Despite all the difficulties in finding microfossils in bottom sediments, data were obtained on characteristic associations mainly related to the redistribution of relatively warm North Atlantic waters. The issues of microfossils in cores and boreholes located on the Barents Sea shelf and continental slope are considered and the most extensive material on changes in sedimentation conditions in the Pleistocene and Holocene is generalized.

Transport of heat, CO 2 and O 2 by the Atlantic’s thermohaline circulation

1995 ◽  
Vol 348 (1324) ◽  
pp. 133-142 ◽  
Keyword(s):  
North Atlantic ◽  
Deep Water ◽  
Thermohaline Circulation ◽  
North Atlantic Deep Water ◽  
Return Flow ◽  
Intermediate Water ◽  
Biological Processes ◽  
Antarctic Intermediate Water ◽  
The North ◽  
The North Atlantic

We estimate transport of heat, CO 2 and O 2 by the Atlantic’s thermohaline circulation using an approach based on differences in the chemical and physical characteristics of North Atlantic Deep Water (NADW), Antarctic Intermediate Water (AAIW), and the northward return flow across the equator. The characteristics of the return-flow waters are constrained by imposing conservation of phosphate in the North Atlantic as a whole. Based on a total equatorial return flow of 13 x 10 6 m 3 s -1 , we find that the Atlantic north of the equator is a source of 7.7 ± 1.4 x 10 14 W to the atmosphere, a sink of 0.51 ± 0.21 x 10 14 mol of O 2 , and preindustrially was a sink of 0.33 ± 0.15 x 10 14 mol of CO 2 . Uptake of O 2 and CO 2 by the North Atlantic is driven mainly by thermal, as opposed to biological processes.

Late Quaternary palaeo-oceanography of the Denmark Strait overflow pathway, South-East Greenland margin

1998 ◽  
Vol 180 ◽  
pp. 163-167
Author(s):  
Antoon Kuijpers ◽  
Jørn Bo Jensen ◽  
Simon R . Troelstra ◽  
And shipboard scientific party of RV Professor Logachev and RV Dana
Keyword(s):  
North Atlantic ◽  
Deep Water ◽  
Deep Convection ◽  
Conveyor Belt ◽  
Water Masses ◽  
Labrador Sea ◽  
Greenland Sea ◽  
The North ◽  
Denmark Strait ◽  
The North Atlantic

Direct interaction between the atmosphere and the deep ocean basins takes place today only in the Southern Ocean near the Antarctic continent and in the northern extremity of the North Atlantic Ocean, notably in the Norwegian–Greenland Sea and Labrador Sea. Cooling and evaporation cause surface waters in the latter region to become dense and sink. At depth, further mixing occurs with Arctic water masses from adjacent polar shelves. Export of these water masses from the Norwegian–Greenland Sea (Norwegian Sea Overflow Water) to the North Atlantic basin occurs via two major gateways, the Denmark Strait system and the Faeroe– Shetland Channel and Faeroe Bank Channel system (e.g. Dickson et al. 1990; Fig.1). Deep convection in the Labrador Sea produces intermediate waters (Labrador Sea Water), which spreads across the North Atlantic. Deep waters thus formed in the North Atlantic (North Atlantic Deep Water) constitute an essential component of a global ‘conveyor’ belt extending from the North Atlantic via the Southern and Indian Oceans to the Pacific. Water masses return as a (warm) surface water flow. In the North Atlantic this is the Gulf Stream and the relatively warm and saline North Atlantic Current. Numerous palaeo-oceanographic studies have indicated that climatic changes in the North Atlantic region are closely related to changes in surface circulation and in the production of North Atlantic Deep Water. Abrupt shut-down of the ocean-overturning and subsequently of the conveyor belt is believed to represent a potential explanation for rapid climate deterioration at high latitudes, such as those that caused the Quaternary ice ages. Here it should be noted, that significant changes in deep convection in Greenland waters have also recently occurred. While in the Greenland Sea deep water formation over the last decade has drastically decreased, a strong increase of deep convection has simultaneously been observed in the Labrador Sea (Sy et al. 1997).

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