Seasonal maxima at 45/sup 0/N in the last 150,000 years: implications for recognizing deglacial and precessional events
Conference
·
· Geol. Soc. Am., Abstr. Programs; (United States)
OSTI ID:6463330
Earlier work by other investigators has shown that planktonic foraminifera secrete their tests in either warm or cold parts of the year, depending on the species. The O/sup 18///sup 16/ ratios in their tests reflect the temperature of the water and provide a means to measure paleo-seasonality values. The authors present the first extended (150,000 year) O/sup 18///sup 16/ ratio record obtained using parallel isotope values from both warm and cold water planktonic foraminifera in the same subsamples down core. The isotope values reflect seasonality values independent of faunal tolerances. The core location at 45/sup 0/N is in a critical location to understand glacial-deglacial events. The seasonality record obtained with isotopes indicates much stronger seasonal fluctuations than previously reported using faunal assemblages. Seasonality minimums can be used to pinpoint glacial maximums while seasonality maximums can be used to precisely locate interglacial precessional signals. Using a combination of cold water values and seasonality deviation, it is possible to detect all the precessional signals, even those in intermediate glacial cycles.
- Research Organization:
- Dalhousie Univ., Halifax, Nova Scotia (Canada)
- OSTI ID:
- 6463330
- Report Number(s):
- CONF-8510489-
- Conference Information:
- Journal Name: Geol. Soc. Am., Abstr. Programs; (United States) Journal Volume: 17
- Country of Publication:
- United States
- Language:
- English
Similar Records
Late quaternary paleoceanography of the Atlantic Ocean: foraminiferal faunal and stable-isotopic evidence
Late quaternary history of hydrography, oxygen depletion and organic carbon accumulation on the Oman Margin
Are seawater Sr/Ca variations preserved in Quaternary foraminifera?
Thesis/Dissertation
·
Tue Dec 31 23:00:00 EST 1985
·
OSTI ID:6827258
Late quaternary history of hydrography, oxygen depletion and organic carbon accumulation on the Oman Margin
Conference
·
Mon Jan 08 23:00:00 EST 1990
· EOS, Transactions, American Geophysical Union; (United States)
·
OSTI ID:6662048
Are seawater Sr/Ca variations preserved in Quaternary foraminifera?
Journal Article
·
Sun Oct 31 23:00:00 EST 1999
· Geochimica et Cosmochimica Acta
·
OSTI ID:20006261
Related Subjects
58 GEOSCIENCES
580100* -- Geology & Hydrology-- (-1989)
580400 -- Geochemistry-- (-1989)
ANIMALS
AQUATIC ORGANISMS
BODY
CHEMICAL COMPOSITION
CHEMISTRY
CLIMATE MODELS
EARTH PLANET
EVEN-EVEN NUCLEI
EXOSKELETON
FORAMINIFERA
GEOCHEMISTRY
GLACIERS
GLOBAL ASPECTS
INVERTEBRATES
ISOTOPE RATIO
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MICROORGANISMS
NUCLEI
OCEANOGRAPHY
ORGANS
OXYGEN 16
OXYGEN 18
OXYGEN ISOTOPES
PALEOCLIMATOLOGY
PALEONTOLOGY
PLANETS
PLANKTON
PROTOZOA
SARCODINA
SEAS
SEASONAL VARIATIONS
SKELETON
STABLE ISOTOPES
SURFACE WATERS
TEMPERATURE MEASUREMENT
USES
VARIATIONS
WATER CHEMISTRY
580100* -- Geology & Hydrology-- (-1989)
580400 -- Geochemistry-- (-1989)
ANIMALS
AQUATIC ORGANISMS
BODY
CHEMICAL COMPOSITION
CHEMISTRY
CLIMATE MODELS
EARTH PLANET
EVEN-EVEN NUCLEI
EXOSKELETON
FORAMINIFERA
GEOCHEMISTRY
GLACIERS
GLOBAL ASPECTS
INVERTEBRATES
ISOTOPE RATIO
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MICROORGANISMS
NUCLEI
OCEANOGRAPHY
ORGANS
OXYGEN 16
OXYGEN 18
OXYGEN ISOTOPES
PALEOCLIMATOLOGY
PALEONTOLOGY
PLANETS
PLANKTON
PROTOZOA
SARCODINA
SEAS
SEASONAL VARIATIONS
SKELETON
STABLE ISOTOPES
SURFACE WATERS
TEMPERATURE MEASUREMENT
USES
VARIATIONS
WATER CHEMISTRY