Flux and provenance of ice-rafted debris in the earliest Pleistocene sub-polar North Atlantic Ocean comparable to the last glacial maximum

2012 ◽  
Vol 341-344 ◽  
pp. 222-233 ◽  
Author(s):  
Ian Bailey ◽  
Gavin L. Foster ◽  
Paul A. Wilson ◽  
Luigi Jovane ◽  
Craig D. Storey ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Last Glacial Maximum ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Glacial Maximum ◽  
Last Glacial ◽  
The Last Glacial Maximum ◽  
The Last Glacial

scholarly journals More efficient North Atlantic carbon pump during the Last Glacial Maximum

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
J. Yu ◽  
L. Menviel ◽  
Z. D. Jin ◽  
D. J. R. Thornalley ◽  
G. L. Foster ◽  
...  
Keyword(s):  
Last Glacial Maximum ◽  
North Atlantic ◽  
Glacial Maximum ◽  
Last Glacial ◽  
Carbon Pump ◽  
The Last Glacial Maximum ◽  
The Last Glacial

Reconstruction of sea-surface temperature, salinity, and sea-ice cover in the northern North Atlantic during the last glacial maximum based on dinocyst assemblages

2000 ◽  
Vol 37 (5) ◽  
pp. 725-750 ◽  
Author(s):  
Anne de Vernal ◽  
Claude Hillaire-Marcel ◽  
Jean-Louis Turon ◽  
Jens Matthiessen
Keyword(s):  
Sea Ice ◽  
Surface Temperature ◽  
Last Glacial Maximum ◽  
North Atlantic ◽  
Ice Cover ◽  
Glacial Maximum ◽  
Sea Surface ◽  
Last Glacial ◽  
The Last Glacial Maximum ◽  
The Last Glacial

Past sea-surface conditions over the northern North Atlantic during the last glacial maximum were examined from the study of 61 deep-sea cores. The last glacial maximum time slice studied here corresponds to an interval between Heinrich layers H2 and H1, and spanning about 20-16 ka on a 14C time scale. Transfer functions based on dinocyst assemblages were used to reconstruct sea-surface temperature, salinity, and sea-ice cover. The results illustrate extensive sea-ice cover along the eastern Canadian margins and sea-ice spreading, only during winter, over most of the northern North Atlantic. On the whole, much colder winter prevailed, despite relatively mild conditions in August (10-15°C at most offshore sites), thus suggesting a larger seasonal contrast of temperatures than today. Lower salinity than at present is reconstructed, especially along the eastern Canadian and Scandinavian margins, likely because of meltwater supply from the surrounding ice sheets. These reconstructions contrast with those established by CLIMAP on the basis of planktonic foraminifera. These differences are discussed with reference to the stratigraphical frame of the last glacial maximum, which was not the coldest phase of the last glacial stage. The respective significance of dinocyst and foraminifer records is also examined in terms of the thermohaline characteristics of surface waters and the vertical structure of upper water masses, which was apparently much more stratified than at present in the northern North Atlantic, thus preventing deep-water formation.

scholarly journals North Atlantic Deep Water Production during the Last Glacial Maximum

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Jacob N. W. Howe ◽  
Alexander M. Piotrowski ◽  
Taryn L. Noble ◽  
Stefan Mulitza ◽  
Cristiano M. Chiessi ◽  
...  
Keyword(s):  
Last Glacial Maximum ◽  
North Atlantic ◽  
Deep Water ◽  
North Atlantic Deep Water ◽  
Glacial Maximum ◽  
Water Production ◽  
Last Glacial ◽  
The Last Glacial Maximum ◽  
The Last Glacial

Last glacial maximum (LGM) primary productivity in the northern North Atlantic OceanThis article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network.

2008 ◽  
Vol 45 (11) ◽  
pp. 1299-1316 ◽  
Author(s):  
Taoufik Radi ◽  
Anne de Vernal
Keyword(s):  
Atlantic Ocean ◽  
Last Glacial Maximum ◽  
North Atlantic ◽  
Primary Productivity ◽  
North Atlantic Ocean ◽  
Glacial Maximum ◽  
Meridional Overturning Circulation ◽  
Last Glacial ◽  
Annual Productivity ◽  
Modern Analogue

To reconstruct oceanic primary productivity in the northern North Atlantic Ocean during the last glacial maximum (LGM), we have applied the modern analogue technique to dinocyst assemblages using a Northern Hemisphere database that includes 1171 reference sites. The reconstructions were made in LGM sediments (21 ± 2 ka) of a set of 62 cores collected from 36°N to 75°N. Here, we present the compilation of reconstructed seasonal and annual productivity during the LGM. Results show lower mean annual productivity during the LGM than at present in the northern North Atlantic. At most high-latitude locations, LGM productivity has been estimated at <200 gC m–2 a–1, with extremely low values (<100 gC m–2 a–1) in the Labrador Sea, Baffin Bay, and along the margins of Greenland. Such low values might be the result of reduced Atlantic Meridional Overturning Circulation and stratified water that characterized the glacial episode of the North Atlantic Ocean.

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