Abstracts - faqs.org

Abstracts

Zoology and wildlife conservation

Search abstracts:
Abstracts » Zoology and wildlife conservation

Evidence from U-Th dating against Northern Hemisphere forcing of the penultimate deglaciation

Article Abstract:

It has been possible to date the penultimate deglaciation in a record from the Bahamas using a new U-Th isochron technique. It was established that the midpoint of the penultimate glaciation is 135,200 years, plus or minus 2,500 years. This age is consistent with some coral data. Deglaciation centred at this date is hard to reconcile with an ice-age cycle triggered directly by Northern Hemisphere June isolation, and a more indirect role for changes in isolation must therefore be identified. Modelling indicates that increasing isolation prompts a larger than average number of El Nino/Southern Oscillation warm events, beginning at around 137,000 years ago.

Author: Henderson, Gideon M., Slowey, Niall C.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000

User Contributions:

Comment about this article or add new information about this topic:

CAPTCHA


Direct U-Th dating of marine sediments from the two most recent interglacial periods

Article Abstract:

The direct U-Th dating of aragonite-rich marine sediments gives an accurately dated marine oxygen-isotope record of 120-127 kyr BP for the last interglacial and 189-190 kyr BP for the late stage 7 interglacial. These dates are consistent with the general theory of orbitally forced climate fluctuations. This direct-dating approach establishes an accurate chronology for Pleistocene marine sediments beyond the range of radiocarbon dating. This technique determines the timing of the events, the rate of processes, and the relationship between marine and climatic records.

Author: Henderson, Gideon M., Slowey, Niall C., Curry, William B.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
Usage, Gases, Geology, Stratigraphic, Stratigraphy, Marine sediments, Radioactive dating, Radiometric dating

User Contributions:

Comment about this article or add new information about this topic:

CAPTCHA


Extending the Vostok ice-core record of palaeoclimate to the penultimate glacial period

Article Abstract:

A new glaciological time-scale that is consistent with ocean records has been established for the Vostok station in Antarctica. Ice-core records which reveal local temperature, dust accumulation and air composition extend the glaciological time-scale to the penultimate glacial period, approximately 140,000 to 200,000 years ago. Vostok's penultimate glacial period was colder t the most recent one, and concentrations of carbon dioxide and CH4 correlate well in relation to temperature throughout the record.

Author: Jouzel, J., Barkov, N.I., Barnola, J.M., Bender, M., Chappellaz, J., Genthon, C., Kotlyakov, V.M., Lipenkov, V., Lorius, C., Petit, J.R., Raynaud, D., Raisbeck, G., Ritz, C., Sowers, T., Stievenard, M., Yiou, F., Yiou, P.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
Antarctica, Glaciers, Glacial climates, Antarctic Regions

User Contributions:

Comment about this article or add new information about this topic:

CAPTCHA


Subjects list: Research, Glacial epoch, Ice age
Similar abstracts:
  • Abstracts: Effects of grazing on the demography and growth of the Texas tortoise. Effects of Roads on the Structure of Freshwater Turtle Populations
  • Abstracts: Molecular cloning and expression of the gene for a human D1 dopamine receptor. Cloning and expression of human and rat D1 dopamine receptors
  • Abstracts: Finding an appropriate order for a hierarchy: a comparison of the I&SI and the BBS methods. Measuring and testing the steepness of dominance hierarchies
  • Abstracts: Observation of moist convection in Jupiter's atmosphere. Moist convection as an energy source for the large-scale motions in Jupiter's atmosphere
  • Abstracts: Structure and bandgap closure in dense hydrogen. Spontaneous polarization in dense hydrogen. Emergent reduction of electronic state dimensionality in dense ordered Li-Be alloys
This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.
Some parts © 2025 Advameg, Inc.