Climatic Changes in Northwest Africa during the Last Deglaciation (16–7 ka BP)

1992 ◽  
pp. 295-325 ◽  
Author(s):  
F. Gasse ◽  
J. Ch. Fontes
Keyword(s):  
Climatic Changes ◽  
Last Deglaciation ◽  
Northwest Africa ◽  
The Last Deglaciation

The Impact on Europe of Large-Scale Climatic Changes: The Onset of Glaciation and the Last Deglaciation

1986 ◽  
pp. 28-44 ◽  
Author(s):  
J. C. Duplessy ◽  
L. Labeyrie ◽  
J. Moyes ◽  
J. L. Turon ◽  
J. Duprat ◽  
...  
Keyword(s):  
Large Scale ◽  
Climatic Changes ◽  
Last Deglaciation ◽  
The Last Deglaciation ◽  
The Impact

scholarly journals Deglacial and Holocene vegetation and climatic changes in the southern Central Mediterranean from a direct land–sea correlation

2013 ◽  
Vol 9 (2) ◽  
pp. 767-787 ◽  
Author(s):  
S. Desprat ◽  
N. Combourieu-Nebout ◽  
L. Essallami ◽  
M. A. Sicre ◽  
I. Dormoy ◽  
...  
Keyword(s):  
Winter Precipitation ◽  
Climatic Changes ◽  
Early Holocene ◽  
Last Deglaciation ◽  
Central Mediterranean ◽  
The Holocene ◽  
Southern Central ◽  
The Last Deglaciation ◽  
The Mediterranean ◽  
Trees And Shrubs

Abstract. Despite a large number of studies, the long-term and millennial to centennial-scale climatic variability in the Mediterranean region during the last deglaciation and the Holocene is still debated, including in the southern Central Mediterranean. In this paper, we present a new marine pollen sequence (core MD04-2797CQ) from the Siculo-Tunisian Strait documenting the regional vegetation and climatic changes in the southern Central Mediterranean during the last deglaciation and the Holocene. The MD04-2797CQ marine pollen sequence shows that semi-desert plants dominated the vegetal cover in the southern Central Mediterranean between 18.2 and 12.3 ka cal BP, indicating prevailing dry conditions during the deglaciation, even during the Greenland Interstadial (GI)-1. Across the transition Greenland Stadial (GS)-1 – Holocene, Asteraceae-Poaceae steppe became dominant till 10.1 ka cal BP. This record underlines with no chronological ambiguity that even though temperatures increased, deficiency in moisture availability persisted into the early Holocene. Temperate trees and shrubs with heath underbrush or maquis expanded between 10.1 and 6.6 ka, corresponding to Sapropel 1 (S1) interval, while Mediterranean plants only developed from 6.6 ka onwards. These changes in vegetal cover show that the regional climate in southern Central Mediterranean was wetter during S1 and became drier during the mid- to late Holocene. Wetter conditions during S1 were likely due to increased winter precipitation while summers remained dry. We suggest, in agreement with published modeling experiments, that the early Holocene increased melting of the Laurentide Ice Sheet in conjunction with weak winter insolation played a major role in the development of winter precipitation maxima in the Mediterranean region in controlling the strength and position of the North Atlantic storm track. Finally, our data provide evidence for centennial-scale vegetation and climatic changes in the southern Central Mediterranean. During the wet early Holocene, alkenone-derived cooling episodes are synchronous with herbaceous composition changes that indicate muted changes in precipitation. In contrast, enhanced aridity episodes, as detected by strong reduction in trees and shrubs, are recorded during the mid- to late Holocene. We show that the impact of the Holocene cooling events on the Mediterranean hydroclimate depend on baseline climate states, i.e. insolation and ice sheet extent, shaping the response of the mid-latitude atmospheric circulation.

scholarly journals Deglacial and Holocene vegetation and climatic changes at the southernmost tip of the Central Mediterranean from a direct land-sea correlation

2012 ◽  
Vol 8 (6) ◽  
pp. 5687-5741 ◽  
Author(s):  
S. Desprat ◽  
N. Combourieu-Nebout ◽  
L. Essallami ◽  
M. A. Sicre ◽  
I. Dormoy ◽  
...  
Keyword(s):  
Late Holocene ◽  
Winter Precipitation ◽  
Climatic Changes ◽  
Last Deglaciation ◽  
Central Mediterranean ◽  
The Holocene ◽  
Southern Central ◽  
The Last Deglaciation ◽  
Trees And Shrubs ◽  
Vegetal Cover

Abstract. Despite a large number of studies, the long-term and millennial to centennial-scale climatic variability in the Mediterranean region during the last deglaciation and the Holocene is still debated, in particular in the Southern Central Mediterranean. In this paper, we present a new marine pollen sequence (MD04-2797CQ) from the Siculo-Tunisian Strait documenting the regional vegetation and climatic changes in the Southern Central Mediterranean during the last deglaciation and the Holocene. The MD04-2797CQ marine pollen sequence shows that semi-desert plants dominated the vegetal cover in the Southern Central Mediterranean between 18 and 12.3 kyr BP indicating prevailing dry conditions during the deglaciation, even during the Greenland Interstadial (GI)-1. Such arid conditions likely restricted the expansion of the trees and shrubs despite the GI-1 climatic amelioration. Across the transition Greenland Stadial (GS)-1 – Holocene, Asteraceae-Poaceae steppe became dominant till 10.1 kyr. This record underlines with no chronological ambiguity that even though temperatures increased, deficiency in moisture availability persisted into the Early Holocene.Temperate trees and shrubs with heaths as oak forest understorey or heath maquis expanded between 10.1 and 6.6 kyr, while Mediterranean plants only developed from 6.6 kyr onwards. These changes in vegetal cover show that the regional climate in Southern Central Mediterranean was wetter during Sapropel 1 (S1) and became drier during the Mid- to Late Holocene. Wetter conditions during S1 were likely due to increased winter precipitation while summers remained dry. We suggest, in agreement with published modelling experiments, that the increased melting of the Laurentide Ice Sheet between 10 to 6.8 kyr in conjunction with weak winter insolation played a major role in the development of winter precipitation maxima in the Mediterranean region in controlling the strength and position of the North Atlantic storm track. Finally, our data provide evidences of centennial-scale vegetation and climatic changes in the Southern Central Mediterranean. During the wet Early Holocene, alkenones-derived cooling episodes are synchronous to herbaceous composition changes that indicate muted changes in precipitation. In contrast, enhanced aridity episodes, as detected by strong reduction in trees and shrubs, are recorded during the Mid- to Late Holocene. We show that the impact of the Holocene cooling events depend on the baseline climate states insolation and ice sheet volume, shaping the response of the mid-latitude atmospheric circulation.

Climatic changes since the last deglaciation inferred from a lacustrine sedimentary sequence in the eastern Nanling Mountains, south China

2010 ◽  
Vol 25 (6) ◽  
pp. 975-984 ◽  
Author(s):  
Wei Zhong ◽  
Jibin Xue ◽  
Yanming Zheng ◽  
Jun Ouyang ◽  
Qiaohong Ma ◽  
...  
Keyword(s):  
South China ◽  
Climatic Changes ◽  
Sedimentary Sequence ◽  
Last Deglaciation ◽  
The Last Deglaciation ◽  
Nanling Mountains

Relationships between primary productivity and bottom-water oxygenation off northwest Africa during the last deglaciation

2011 ◽  
Vol 26 (4) ◽  
pp. 448-456 ◽  
Author(s):  
Helena L. Filipsson ◽  
Oscar E. Romero ◽  
Jan-Berend W. Stuut ◽  
Barbara Donner
Keyword(s):  
Primary Productivity ◽  
Bottom Water ◽  
Last Deglaciation ◽  
Northwest Africa ◽  
The Last Deglaciation

Vegetation responses to rapid climatic changes during the last deglaciation 13,500–8,000 years ago on southwest Andøya, arctic Norway

2011 ◽  
Vol 21 (1) ◽  
pp. 17-35 ◽  
Author(s):  
Ingelinn Aarnes ◽  
Anne E. Bjune ◽  
Hilary H. Birks ◽  
Nicholas L. Balascio ◽  
Jostein Bakke ◽  
...  
Keyword(s):  
Climatic Changes ◽  
Last Deglaciation ◽  
Vegetation Responses ◽  
The Last Deglaciation
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