Pleistocene history of the subarctic pacific: periodic and step-wise changes in temperature and precipitation
Conference
·
· Geol. Soc. Am., Abstr. Programs; (United States)
OSTI ID:6320769
Piston core V20-110 records the last 1.8 Ma of North Pacific conditions. Samples at 11 Ka intervals were analyzed for calcite, foraminifera, diatoms, and IRD. Data implies that precipitation varied on a 41-Ka cycle from latest Pliocene to 700 Ka. During the late Pleistocene precipitation, like temperature, has been dominated by a 100 Ka period. There are six distinct intervals, bounded by rapid, unidirectional changes: a) 1.8-1.6 Ma-mostly ice-free, warm (approx.15/sup 0/C), high precipitation, moderately well-mixed waters; b) 1.6-1.3 Ma-slightly cooler (approx.12/sup 0/C), precipitation increasing to maximum, waters well mixed; c) 1.3-1.1 Ma-change to winter precipitation, slightly colder, increased seasonal contrast. d) 1.1 Ma-700 Ka-beginning of glacial mode; periods of high annual precipitation and strong stratification alternate with lower precipitation and more mixing, temperatures cool (approx.10/sup 0/C); e) 700-300 Ka-strong 100-ka cycles, high winter precipitation and low temperatures (5-10/sup 0/C) during glacials; interglacials drier and warmer, more mixing; summer precipitation low throughout; f) 300-0 Ka-glacial maxima cold (<5/sup 0/C), dry, well-mixed; interglacial maxima cool (approx.10/sup 0/C), summer precipitation, well-mixed; transitions high winter precipitation and strong vertical stratification. CCD fluctuating close to 2700 m, being above during glacials and transitions, below only during peak interglacials.
- Research Organization:
- LDGO, Palisades, NY (USA)
- OSTI ID:
- 6320769
- 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
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Mon Jan 30 19:00:00 EST 2017
· Geochimica et Cosmochimica Acta
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OSTI ID:1377069
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Tue Dec 31 23:00:00 EST 1991
· Geological Society of America, Abstracts with Programs; (United States)
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OSTI ID:5690512
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Related Subjects
58 GEOSCIENCES
580100* -- Geology & Hydrology-- (-1989)
580500 -- Oceanography-- (1980-1989)
ALGAE
ALKALINE EARTH METAL COMPOUNDS
ANIMALS
ATMOSPHERIC PRECIPITATIONS
CALCITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
CENOZOIC ERA
CHROMOPHYCOTA
CLIMATE MODELS
CLIMATES
DIATOMS
DRILL CORES
FORAMINIFERA
GEOLOGIC AGES
GEOLOGIC HISTORY
INVERTEBRATES
MATHEMATICAL MODELS
MICROORGANISMS
MINERALS
OCEANOGRAPHY
OXYGEN COMPOUNDS
PACIFIC OCEAN
PALEOCLIMATOLOGY
PALEONTOLOGY
PLANTS
PLEISTOCENE EPOCH
PROTOZOA
QUATERNARY PERIOD
SARCODINA
SEAS
SEDIMENTS
SURFACE WATERS
TEMPERATURE MEASUREMENT
VARIATIONS
580100* -- Geology & Hydrology-- (-1989)
580500 -- Oceanography-- (1980-1989)
ALGAE
ALKALINE EARTH METAL COMPOUNDS
ANIMALS
ATMOSPHERIC PRECIPITATIONS
CALCITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
CENOZOIC ERA
CHROMOPHYCOTA
CLIMATE MODELS
CLIMATES
DIATOMS
DRILL CORES
FORAMINIFERA
GEOLOGIC AGES
GEOLOGIC HISTORY
INVERTEBRATES
MATHEMATICAL MODELS
MICROORGANISMS
MINERALS
OCEANOGRAPHY
OXYGEN COMPOUNDS
PACIFIC OCEAN
PALEOCLIMATOLOGY
PALEONTOLOGY
PLANTS
PLEISTOCENE EPOCH
PROTOZOA
QUATERNARY PERIOD
SARCODINA
SEAS
SEDIMENTS
SURFACE WATERS
TEMPERATURE MEASUREMENT
VARIATIONS