Diachronous evolution of sea surface conditions in the Labrador Sea and Baffin Bay since the last deglaciation

The Holocene ◽  
2015 ◽  
Vol 25 (12) ◽  
pp. 1882-1897 ◽  
Author(s):  
Olivia T Gibb ◽  
Sarah Steinhauer ◽  
Bianca Fréchette ◽  
Anne de Vernal ◽  
Claude Hillaire-Marcel
Keyword(s):  
Sea Surface ◽  
Labrador Sea ◽  
Last Deglaciation ◽  
Surface Conditions ◽  
Baffin Bay ◽  
The Last Deglaciation

scholarly journals Northern and southern hemisphere controls on seasonal sea surface temperatures in the Indian Ocean during the last deglaciation

2013 ◽  
Vol 28 (4) ◽  
pp. 619-632 ◽  
Author(s):  
Yiming V. Wang ◽  
Guillaume Leduc ◽  
Marcus Regenberg ◽  
Nils Andersen ◽  
Thomas Larsen ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Southern Hemisphere ◽  
Sea Surface ◽  
Sea Surface Temperatures ◽  
Last Deglaciation ◽  
Surface Temperatures ◽  
The Indian Ocean ◽  
The Last Deglaciation

scholarly journals Sea surface temperatures of the western Arabian Sea during the last deglaciation

2007 ◽  
Vol 22 (2) ◽  
Author(s):  
M. H. Saher ◽  
S. J. A. Jung ◽  
H. Elderfield ◽  
M. J. Greaves ◽  
D. Kroon
Keyword(s):  
Arabian Sea ◽  
Sea Surface ◽  
Sea Surface Temperatures ◽  
Last Deglaciation ◽  
Surface Temperatures ◽  
The Last Deglaciation

scholarly journals Seemingly divergent sea surface temperature proxy records in the central Mediterranean during the last deglaciation

2013 ◽  
Vol 9 (3) ◽  
pp. 1375-1383 ◽  
Author(s):  
M.-A. Sicre ◽  
G. Siani ◽  
D. Genty ◽  
N. Kallel ◽  
L. Essallami
Keyword(s):  
Adriatic Sea ◽  
Planktonic Foraminifera ◽  
Sea Surface ◽  
Last Deglaciation ◽  
Central Mediterranean ◽  
Proxy Record ◽  
Proxy Records ◽  
The Last Deglaciation ◽  
Temperature Proxy ◽  
Two Temperature

Abstract. Sea surface temperatures (SSTs) were reconstructed over the last 25 000 yr using alkenone paleothermometry and planktonic foraminifera assemblages from two cores of the central Mediterranean Sea: the MD04-2797 core (Siculo–Tunisian channel) and the MD90-917 core (South Adriatic Sea). Comparison of the centennial scale structure of the two temperature signals during the last deglaciation period reveals significant differences in timing and amplitude. We suggest that seasonal changes likely account for seemingly proxy record divergences during abrupt transitions from glacial to interglacial climates and for the apparent short duration of the Younger Dryas (YD) depicted by the alkenone time series, a feature that has already been stressed in earlier studies on the Mediterranean deglaciation.

Correlation between Vegetation in Southwestern Africa and Oceanic Upwelling in the Past 21,000 Years

2000 ◽  
Vol 54 (1) ◽  
pp. 72-80 ◽  
Author(s):  
Ning Shi ◽  
Lydie M. Dupont ◽  
Hans-Jürgen Beug ◽  
Ralph Schneider
Keyword(s):  
Thermohaline Circulation ◽  
Sea Surface ◽  
Pollen Record ◽  
Sea Surface Temperatures ◽  
Last Deglaciation ◽  
Surface Temperatures ◽  
Oceanic Upwelling ◽  
The Last Deglaciation ◽  
The Last Glacial Maximum ◽  
The Last Glacial

Dinoflagellate cyst and pollen records from marine sediments off the southwestern African coast reveal three major aridification periods since the last glaciation and an environmental correlation between land and sea. Abundant pollen of desert, semi-desert, and temperate plants 21,000–17,500 cal yr B.P. show arid and cold conditions in southwestern Africa that correspond to low sea surface temperatures and enhanced upwelling shown by dinoflagellate cysts. Occurrence of Restionaceae in the pollen record suggests northward movement of the winter-rain regime that influenced the study area during the last glacial maximum. Decline of Asteroideae, Restionaceae, and Ericaceae in the pollen record shows that temperate vegetation migrated out of the study area about 17,500 cal yr B.P., probably because of warming during the last deglaciation. The warming in southwestern Africa was associated with weakened upwelling and increased sea surface temperatures, 2000–2800 years earlier than in the Northern Hemisphere. Aridification 14,300–12,600 cal yr B.P. is characterized by a prominent increase of desert and semi-desert pollen without the return of temperate vegetation. This aridification corresponds to enhanced upwelling off Namibia and cooler temperatures in Antarctica, and it might have been influenced by oceanic thermohaline circulation. Aridification 11,000–8900 cal yr B.P. is out of phase with the northern African climate. Reduction of the water vapor supply in southwestern Africa at that time may be related to northward excursions of the Intertropical Convergence Zone.

Palynomorph distribution in Recent sediments from the Labrador Sea

1994 ◽  
Vol 31 (1) ◽  
pp. 115-127 ◽  
Author(s):  
André Rochon ◽  
Anne de Vernal
Keyword(s):  
Surface Water ◽  
Primary Productivity ◽  
Water Masses ◽  
Sea Surface ◽  
Labrador Sea ◽  
Dinoflagellate Cysts ◽  
Eastern Canada ◽  
Long Distance ◽  
Surface Conditions ◽  
Dinoflagellate Cyst

Surface sediments from the Labrador Sea and Baffin Bay have been examined for their palynomorph content. Pollen and spore assemblages reflect the vegetation zones of eastern Canada, although long-distance atmospheric transport results in over-representation of Pinus and spores. A linear decrease of pollen input is observed with distance from the source vegetation; the abyssal domain receives less than 2% of the initial input. The abundance of dinoflagellate cysts reflects a relatively high primary productivity in surface water masses which seems proportional to the benthic productivity, as shown by the concentrations of organic linings of foraminifers. The relative abundance of dinoflagellate cyst taxa and principal component analysis led to the definition of three assemblages that can be related to sea-surface conditions and current pattern. The modern distribution of dinoflagellate cysts was used to interpret assemblages recovered in five box cores from the deep Labrador Sea. Results reveal important changes in sea-surface conditions during the Holocene. At the end of the last glacial period, the productivity in surface waters was sparse, notably on the continental slope off southwest Greenland. Shortly after the deglaciation, the primary productivity increased, probably due to the improvement of sea-surface conditions. At about 5000 BP, the dinoflagellate cyst concentrations and fluxes reach maximum values, and the assemblages are marked by the augmentation of Nematosphaeropsis labyrinthus relative to Operculodinium centrocarpum. This trend is associated with a cooling and the increased influence of the inner component of the Greenland Current in surface water masses of the Labrador Sea. It marks the establishment of modern conditions in the basin.

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