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| Leal,Alejandra; Perez,Tibisay; Bilbao,Bibiana. |
| A palynological analysis of an organic paleosol found at 150-125 cm depth in a Mauritia swamp from the Eastern Orinoco Llanos is presented. The 25 cm pollen record summarizes the vegetation history during the Early Holocene, from 10,225 to 7,800 calendar yr BP. The vegetation was characterized by a Poaceae marsh, where Asteraceae, Melastomataceae, Schefflera-type and Phyllanthus were the most abundant shrubs and trees. Pollen-types richness was lower than that recorded today in similar environments, and Mauritia pollen was absent. Results suggest that climate was as humid as present during the beginning of the Holocene, with a decreasing trend in humidity from around 8,000-7,000 yr BP, in coincidence with the beginning of the "Early-Mid-Holocene Dryness"... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Orinoco Llanos; Mauritia swamp; Early Holocene; Paleoclimate; Early-Mid Holocene Dryness. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672011000400009 |
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| Lodico, Jenna M.; Flower, Benjamin P.; Quinn, Terrence M.. |
| An early Holocene record from the Gulf of Mexico (GOM) reveals climatic and hydrologic changes during the interval from 10.5 to 7 thousand calendar years before present from paired analyses of Mg/Ca and delta O-18 on foraminiferal calcite. The sea surface temperature record based on foraminiferal Mg/Ca contains six oscillations and an overall similar to 1.5 degrees C warming that appears to be similar to the September-March insolation difference. The delta O-18 of seawater in the GOM (delta O-18(GOM)) record contains six oscillations, including a -0.8% excursion that may be associated with the "8.2 ka climate event" or a broader climate anomaly. Faunal census records from three GOM cores exhibit similar changes, suggesting subcentennial-scale variability... |
| Tipo: Text |
Palavras-chave: Early Holocene; Climate variability; Hydrologic variability. |
| Ano: 2006 |
URL: https://archimer.ifremer.fr/doc/00234/34519/33409.pdf |
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