Holocene climate history of the Nunatsiavut (northern Labrador, Canada) established from pollen and dinoflagellate cyst assemblages covering the past 7000 years
| Autor: | Thomas Richerol, Reinhard Pienitz, André Rochon, Bianca Fréchette |
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| Rok vydání: | 2015 |
| Předmět: |
Palynology
010506 paleontology Archeology Global and Planetary Change geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Ecology biology Dinoflagellate Paleontology Fjord biology.organism_classification 01 natural sciences Oceanography Arctic Paleoclimatology Deglaciation Holocene Geology 0105 earth and related environmental sciences Earth-Surface Processes Chronology |
| Zdroj: | The Holocene. 26:44-60 |
| ISSN: | 1477-0911 0959-6836 |
| DOI: | 10.1177/0959683615596823 |
| Popis: | This study documents the past ~7000 years of Holocene climatic history for Labrador and Nunatsiavut, using a sedimentary sequence of more than 8 m retrieved in Nachvak fjord, one of the northernmost fjords of Nunatsiavut. Using a multi-proxy approach combining a solid Accelerator Mass Spectrometry (AMS)-14C chronology and the fossil assemblages of pollen grains and dinoflagellate cysts (dinocysts), we were able to compare terrestrial and marine records in an effort to obtain a better understanding of the mid- to late-Holocene climate history of the Nunatsiavut. Records begin at the end of the deglaciation and showed a general delay in the sequence of climate events which followed, both in terrestrial and marine realms. The presence of Pentapharsodinium dalei in great abundance in Nachvak Fjord revealed a strong influence of the North Atlantic Ocean and the Labrador Sea until ~3000 yr BP. Afterward, its rather fast disappearance marked the increased influence of Arctic waters. The last 1000 years show climate stability in the region over the marine realm and a cooling trend over terrestrial landscapes. |
| Databáze: | OpenAIRE |
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