Last edited by Gurn
Friday, July 24, 2020 | History

3 edition of Holocene proxy-climate data from the Canadian Arctic found in the catalog.

Holocene proxy-climate data from the Canadian Arctic

Geological Survey of Canada.

Holocene proxy-climate data from the Canadian Arctic

by Geological Survey of Canada.

  • 24 Want to read
  • 38 Currently reading

Published by s.n in S.l .
Written in English


Edition Notes

1

StatementLynn Ovenden.
SeriesPaper (Geological Survey of Canada) -- 88-22
ContributionsOvenden, Lynn.
The Physical Object
Pagination11 p.
Number of Pages11
ID Numbers
Open LibraryOL21670068M
ISBN 100660130777

A recent project, Arctic Climate Variability at Several Timescales (ACVAST), has enabled the analysis of many lake sediment cores from across the Canadian Arctic Islands. Multi-proxy analyses (pollen, diatoms and chironomids, biogenic silica and sedimentary properties) are being performed on these cores. This paper presents the results of multi-proxy studies on a series of . Research article 29 Aug Research article | 29 Aug Arctic Holocene proxy climate database – new approaches to assessing geochronological accuracy and .

Over the last 8, years, the atmospheric CO 2 concentration has risen steadily, while the average global temperature has declined. This fact contradicts the claim that CO 2 is the main "global warming" control knob. More on the relation between CO 2 and temperature: Temperature versus CO 2 – the big picture. CO 2 is a greenhouse gas, but it's warming capability is almost . Wolfe, A.P. A year diatom record from southwestern Fosheim Peninsula, Ellesmere Island, Canadian High Arctic. In Garneau, M. and Alt, B.T., editors, Environmental response to climate change in the Canadian High Arctic. Geological Survey of Canada. Bulletin , Ottawa: Geological Survey of Canada, Supply and Services Canada,

TRACE amounts of wind-blown tree pollen from the highly productive boreal coniferous forests are a characteristic component of arctic tundra sediments1,2. These exotic pollen are generally.   The Arctic ice core data emphatically tells us that we have already entered an ice age 8, years ago, and entered a global warming phase between and (which has putatively come to an end in ). Click on this page and download a free copy of my book “Revolution: Ice Age Re-Entry,” and read more about this topic in Chapter 4.


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Holocene proxy-climate data from the Canadian Arctic by Geological Survey of Canada. Download PDF EPUB FB2

Holocene proxy-climate data from the Canadian Arctic. Ottawa, Canada: Energy, Mines, and Resources Canada, (OCoLC) Material Type: Government publication, National government publication: Document Type: Book: All Authors / Contributors: Lynn E Ovenden.

Here we develop a composite record of δ 18 O from ice wedges—a winter precipitation archive—to reconstruct changes in winter climate in the northwestern Canadian Arctic since ~ kyr b2k. Our record shows a long‐term δ 18 O enrichment (+( ± )‰ kyr −1), suggesting winter temperatures increased since the mid‐Holocene, a Author: Kira M.

Holland, Trevor J. Porter, Duane G. Froese, Steven V. Kokelj, Casey A. Buchanan. Heat map of temperature-sensitive records in the Arctic Canada/Greenland region of the Arctic Holocene database (Sundqvist et al., ).

Numbers refer to. Variation in late holocene marine environments in the Canadian Arctic Archipelago: Evidence from ringed seal bone collagen stable isotope compositions These data demonstrate the potential of using marine mammals from archaeological sites to reconstruct the changing importance of sea ice to food webs over time and offer insight into the.

A synthesis of numerous proxy climate data series from the Canadian Arctic Archipelago indicates that, in the region of KR02, the “Holocene Thermal Maximum” (HTM) initiated around –10, cal yr BP and terminated around cal yr BP (Kaufman et al., ).

There was considerable variability between the various records used in the Cited by:   Paul Szpak, James M. Savelle, James Conolly, Michael P. Richards, Variation in late holocene marine environments in the Canadian Arctic Archipelago: Evidence from ringed seal bone collagen stable isotope compositions, Quaternary Science Reviews, /rev,(), ().

This synthesis paper summarizes published proxy climate evidence showing the spatial and temporal pattern of climate change through the Holocene in Arctic Canada and Greenland.

Our synthesis includes 47 records from a recently published database of highly resolved Holocene paleoclimate time series from the Arctic (Sundqvist et al., ).

Holocene Epoch - Holocene Epoch - Holocene climatic trends and chronology: In the mid-latitudes and the tropics, the end of the last glacial period was marked by a tremendous increase in rainfall. The increased precipitation toward the end of the Pleistocene was marked by a vast proliferation of pluvial lakes in the Great Basin of western North America, notably Lake.

1. Introduction. Regional summaries of available postglacial paleoclimate data from the Arctic have indicated a warm early Holocene (Holocene Thermal Maximum; HTM), and in North America and Greenland, the timing of maximum temperatures varies from west to east (Gajewski and Atkinson,Kaufman et al.,Miller et al., ).However, these.

Email your librarian or administrator to recommend adding this book to your organisation's collection. The Diatoms. 2nd edition Siliceous microfossils in a Holocene, High Arctic peat deposit (Nordvestø, northern Greenland). Canadian Journal of Holocene proxy-climate data from the Canadian Arctic.

Geological Survey of Canada Paper,   The region is influenced by outflow from the Arctic to the North Atlantic through Canadian Arctic Archipelago, the Baffin Bay and the Labrador Sea and by the relative proximity of the Greenland Ice Sheet, meltwater discharge and sea ice dynamics in adjacent seas as well as weather patterns over the continent (Vavrus et al., ).

The melt-layer record is in broad agreement with geological records of glacier retreat during the Holocene 6–8, indicating that these data also contain information of regional significance. This study presents a diatom-based analysis of the post-glacial Holocene environmental history at Lake RS29 on Somerset Island in the Canadian High Arctic.

Earliest post-glacial diatom assemblages (10 –10 cal yr BP) consisted mainly of small, benthic fragilarioid taxa. Proxy data indicate that mid-Holocene Arctic sea ice cover was likely reduced relative to the present (7–9).

The Arctic temperature is closely related to the global mean temperature in equilibrium climate states (10), and Arctic warming has been directly linked to warming of the extratropical ocean (11, 12). We present a global compilation of quality-controlled, published, temperature-sensitive proxy records extending b years through the Holocene.

Data. Climatic variations during the past 10 and 1 years in the Canadian Arctic are recorded in a variety of proxy-climate records. Paleoclimates of the past years are interpreted from ice cores, lake sediments, and primarily tree rings. Arctic sea ice could be completely gone byaccording to a new study that compared present day conditions with those during the.

by binning the data into year intervals, normalizing each to a mean of zero and a Summary of the 6 new proxy climate records from Arctic lakes with sub-decadal to annual resolution.

A) Holocene paleoclimate of the Canadian Arctic Islands: The ACVAST project. o n r a d. a J e w s K i. 1, m. Holocene climate based on pollen transfer functions, eastern Canadian Arctic Arctic and Alpine Research 12 41 64 Bartlein, P.J.

Webb, T. III (). Holocene climatic changes estimated from pollen data from the northern Midwest Knox, J.C. Quaternary History of the Driftless Area. A vast assortment of unique Holocene proxy climate records is available from the Arctic. Developing a uniform database of proxy climate records requires a systematic approach to handle a data set based on such heterogeneous input.

The database represents an extensive search of proxy climate records published prior to November A list of other. Temperature reconstructions from a lake in the eastern Canadian Arctic indicate that peak warmth in the early Holocene was interrupted by two abrupt, short-lived temperature reversals at ~9.l and ~ ka.

Summer temperatures at Lake CF8, Baffin Island (~ km west of Greenland) are inferred from subfossil midge (Chironomidae) assemblages. Our results indicate that the .L arge-magnitude, rapid climate change events—some taking place within just a few decades, less than the span of a single human lifetime ([1][1])—characterized the last glacial period, between ab years ago ([2][2]).

Such events result in a big signal in the geologic record through the modification of the landscape by glaciers, changes in atmospheric .The relatively high sedimentation rate ( cm yr-1) coupled with the consistency of deposition makes this lake a significant indicator for recent climate changes of the Canadian Arctic Archipelago.

Sediments from a 3 ha lake (75 °′N, 89 °′W) from the coastal region of northern Devon Island, Nunavut, Canada, contain disc.