11 dossier(s) trouvé(s) portant l’étiquette "paleoclimatology" (les projets pluriannuels sont regroupés):
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Testing the northern route for Younger Dryas meltwater
chercheur principal: Keigwin, Lloyd D
Année(s) de permis: 2013
Résumé: Here is the project summary from the (U.S.) National Science Foundation proposal that led to this expedition: The research team propose a three-year project to investigate the origin of the Younger Dryas cooling that began about 13,000 years ago. For decades this cold event has been associated with sea ice in the Arctic and North Atlantic Oceans, and the storage and release of fresh water from ...


Holocene paleoecology and paleoclimatology of the central Canadian Arctic Islands
chercheur principal: Gajewski, Konrad
Année(s) de permis: 2008 2004 2001 1994 1993 1992 1991 1990
Résumé: This research is a study of the changes in the climate and vegetation across the Canadian Arctic for the past 10 000 years. By studying lake sediments, the researchers will determine how climate changes in the past affected the vegetation of the region....


Dendrochronological Field Invesitigations at the Northern North American Treeline
chercheur principal: D'Arrigo, Rosanne
Année(s) de permis: 2004
Résumé: The overall goal of the project is to develop tree-ring records from old growth trees at northern treeline locations in Canada and Alaska. This information is used to reconstruct Arctic and Northern Hemisphere temperatures over the past several centuries...


Late Quaternary hydrological and climatic history of the lower MacKenzie River basin
chercheur principal: Beierle, Brandon
Année(s) de permis: 2002
Résumé: The research team will obtain sediment cores from a series of lakes near Reindeer Station and Inuvik for the purpose of reconstructing the hydrological, climatological and geomorphic history of the lower Mackenzie River basin. The research will require fieldwork between 15 April and 25 April. Research will involve the development of a high-resolution paleoenvironmental record based on lake sedime...


Role of Climate and Sea Change on Early Cambrian Evolution
chercheur principal: Pope, Michael
Année(s) de permis: 2003 2002 2001
Résumé: The research team will fly to Norman Wells by commercial airline, and then travel to the field by helicopter or Twin Otter. Travel in the field will be by canoe, or on foot. Field camps will be low impact, and will be occupied for less than 14 days. All human waste will be buried, and all non-burnable garbage will be packed out. The research team will measure, describe and sample the Early Camb...


Ecophysiological Reconstruction of High Latitude Fossils
chercheur principal: Jagels, Richard
Année(s) de permis: 2000
Résumé: The NWT component of this study is to examine how the anatomical features of wood from the genus Larix, vary with changes in latitude. This will be compared to work done on Axel Heiberg Island, Nunavut where a fossil forest of mummified wood approximately 45 million years old was found. Certain features of wood can provide clues to assess winter temperatures but these features vary with latitude....


A late Cretaceous and Paleogene arctic paleoclimate record: the sedimentary sequence at Strand Fiord, Axel Heiberg Island, NWT
chercheur principal: Tarduno, John A.
Année(s) de permis: 1993
Résumé: For much of the Earth's history, the arctic has had a mild climate, quite unlike the conditions that now exist. Evidence that supports this past climate are fossil plants and animals (including crocodiles and tortoises) found in the arctic. The Earth's magnetic field has changed over time and these changes are contained in the fossils. This research will try develop a technique to age these fos...


Freezing history and depositional setting of massive ground ice in the Canadian High Arctic
chercheur principal: Bell, Trevor
Année(s) de permis: 1993 1990 1988
Résumé: This study will provide a better understanding of permafrost conditions in the high arctic as well as the environmental conditions that lead to permafrost formation. Study sites include the Fosheim Peninsula on Ellesmere Island and May Point and Mokka Fiord on eastern Axel Heiberg Island....


Upper Silurian reef mounds at the Douro-Devon Island formational boundary, Devon and southwestern Ellesmere Islands
chercheur principal: Dixon, O.A.
Année(s) de permis: 1993 1992 1990 1988
Résumé: In the Arctic Islands, we are studying rocks and the fossils found within these rocks that were formed more than 400 million years ago in warm tropical seas. This study is expected to help in describing the temperatures, climate and water depths of these ancient seas. We are also studying the types of fossil corals and sponge-like animals that are not present in our seas today....


Use of Fossil Plants and Shells to Infer Past Climate
chercheur principal: Marino, Bruno D.
Année(s) de permis: 1992
Résumé: The researcher will sample plants and shells containing records of the stable isotopic composition of the constituents in the environment that are used for growth. The natural abundance of the stable isotopes of carbon in atmospheric CO2 and in dissolved groundwater as well as the hydrogen and oxygen isotopes in water can be related to climatic factors. Thus, these isotope ratios in shells and p...


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