Similarities and discrepancies between andean ice cores over the last deglaciation : climate implications
Andean ice cores extracted from high altitude glaciers have provided a wealth of original information dealing with past climate variability both in tropical and subtropical South America. In this chapter, we focus on the transition between the Last Glacial Maximum (LGM) and the Holocene period as re...
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ftird:oai:ird.fr:fdi:010082932 2024-09-09T19:08:57+00:00 Similarities and discrepancies between andean ice cores over the last deglaciation : climate implications Past climate variability in South America and surrounding regions : from the last glacial maximum to the Holocene /Vimeux, Françoise /Vimeux, Françoise (ed.) /Sylvestre, Florence (ed.) /Khodri, Myriam (ed.) ANDES PACIFIQUE ATLANTIQUE AMERIQUE DU SUD 2009 https://www.documentation.ird.fr/hor/fdi:010082932 EN eng Springer https://www.documentation.ird.fr/hor/fdi:010082932 oai:ird.fr:fdi:010082932 Vimeux Françoise, . Similarities and discrepancies between andean ice cores over the last deglaciation : climate implications. In : Vimeux Françoise (ed.), Sylvestre Florence (ed.), Khodri Myriam (ed.), . Past climate variability in South America and surrounding regions : from the last glacial maximum to the Holocene [Dordrecht] : Springer, 14). 2009, 239-255 text 2009 ftird 2024-08-15T05:57:42Z Andean ice cores extracted from high altitude glaciers have provided a wealth of original information dealing with past climate variability both in tropical and subtropical South America. In this chapter, we focus on the transition between the Last Glacial Maximum (LGM) and the Holocene period as recorded by the isotopic composition of the ice (oxygen 18, ?18O or deuterium, ?D) of three Andean ice cores spanning at least the last ?20,000 years (Sajama, 18°S; Illimani, 16°S; Huascarán, 9°S). We discuss the uncertainties of Andean ice cores dating and compare the three Andean records together and with the isotopic composition of Greenland and Antarctic ice cores (NorthGRIP, 75°N; EPICA Dome C, 75°S). We attribute the common glacial-interglacial isotopic composition increase (?18O4-6/OO) recorded in Andean ice cores to the enhanced net precipitation lost by airmasses (avergae+5-7%) at LGM, from the moisture oceanic source to the Andean summits. We discuss the roles of precession and glacial boundary forcings that have been pointed out so far to explain wet conditions in the southern tropics of South America during glacial climate. We also spot that along the deglaciation, strong discrepancies exist between the Sajama ice core and the two other Andean ice cores. A Greenland-like deglacial progression can be observed at Sajama site with a rapid return to near-glacial conditions at around 14 ka, mimicking the Younger Dryas event, whereas an Antarctic-like deglaciation pattern can be identified both at Illimani and Huascarán sites bearing intriguing similarities to the Antarctic Cold Reversal. We discuss different hypotheses including local climate and Pacific influence to examine the possible causes of those discrepancies during the deglaciation. Text Antarc* Antarctic EPICA Greenland ice core IRD (Institute de recherche pour le développement): Horizon Antarctic The Antarctic Greenland Pacific |
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Open Polar |
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IRD (Institute de recherche pour le développement): Horizon |
op_collection_id |
ftird |
language |
English |
description |
Andean ice cores extracted from high altitude glaciers have provided a wealth of original information dealing with past climate variability both in tropical and subtropical South America. In this chapter, we focus on the transition between the Last Glacial Maximum (LGM) and the Holocene period as recorded by the isotopic composition of the ice (oxygen 18, ?18O or deuterium, ?D) of three Andean ice cores spanning at least the last ?20,000 years (Sajama, 18°S; Illimani, 16°S; Huascarán, 9°S). We discuss the uncertainties of Andean ice cores dating and compare the three Andean records together and with the isotopic composition of Greenland and Antarctic ice cores (NorthGRIP, 75°N; EPICA Dome C, 75°S). We attribute the common glacial-interglacial isotopic composition increase (?18O4-6/OO) recorded in Andean ice cores to the enhanced net precipitation lost by airmasses (avergae+5-7%) at LGM, from the moisture oceanic source to the Andean summits. We discuss the roles of precession and glacial boundary forcings that have been pointed out so far to explain wet conditions in the southern tropics of South America during glacial climate. We also spot that along the deglaciation, strong discrepancies exist between the Sajama ice core and the two other Andean ice cores. A Greenland-like deglacial progression can be observed at Sajama site with a rapid return to near-glacial conditions at around 14 ka, mimicking the Younger Dryas event, whereas an Antarctic-like deglaciation pattern can be identified both at Illimani and Huascarán sites bearing intriguing similarities to the Antarctic Cold Reversal. We discuss different hypotheses including local climate and Pacific influence to examine the possible causes of those discrepancies during the deglaciation. |
author2 |
/Vimeux, Françoise (ed.) /Sylvestre, Florence (ed.) /Khodri, Myriam (ed.) |
format |
Text |
author |
/Vimeux, Françoise |
spellingShingle |
/Vimeux, Françoise Similarities and discrepancies between andean ice cores over the last deglaciation : climate implications |
author_facet |
/Vimeux, Françoise |
author_sort |
/Vimeux, Françoise |
title |
Similarities and discrepancies between andean ice cores over the last deglaciation : climate implications |
title_short |
Similarities and discrepancies between andean ice cores over the last deglaciation : climate implications |
title_full |
Similarities and discrepancies between andean ice cores over the last deglaciation : climate implications |
title_fullStr |
Similarities and discrepancies between andean ice cores over the last deglaciation : climate implications |
title_full_unstemmed |
Similarities and discrepancies between andean ice cores over the last deglaciation : climate implications |
title_sort |
similarities and discrepancies between andean ice cores over the last deglaciation : climate implications |
publisher |
Springer |
publishDate |
2009 |
url |
https://www.documentation.ird.fr/hor/fdi:010082932 |
op_coverage |
ANDES PACIFIQUE ATLANTIQUE AMERIQUE DU SUD |
geographic |
Antarctic The Antarctic Greenland Pacific |
geographic_facet |
Antarctic The Antarctic Greenland Pacific |
genre |
Antarc* Antarctic EPICA Greenland ice core |
genre_facet |
Antarc* Antarctic EPICA Greenland ice core |
op_relation |
https://www.documentation.ird.fr/hor/fdi:010082932 oai:ird.fr:fdi:010082932 Vimeux Françoise, . Similarities and discrepancies between andean ice cores over the last deglaciation : climate implications. In : Vimeux Françoise (ed.), Sylvestre Florence (ed.), Khodri Myriam (ed.), . Past climate variability in South America and surrounding regions : from the last glacial maximum to the Holocene [Dordrecht] : Springer, 14). 2009, 239-255 |
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1809823243981291520 |