Late Pleistocene Paleo-oceanography of the Tropical Southeast Pacific PDF Download
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Author: Boaz Luz
Publisher:
ISBN:
Category :
Languages : en
Pages : 274
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Author: Boaz Luz
Publisher:
ISBN:
Category :
Languages : en
Pages : 274
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Author: Unni Havem Rowell
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 88
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Author: R. M. Cline
Publisher: Geological Society of America
ISBN: 0813711452
Category : Science
Languages : en
Pages : 636
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Author: Chiye R. Wenkam
Publisher:
ISBN:
Category : Oceanography
Languages : en
Pages : 143
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Factor analysis of radiolarian species from the tops of 34 gravity cores in the area extending from 5°N to 45°N, 95°W to 155°W, yields five factor assemblages which are related to the present surface circulation: 1) a Pacific Equatorial Water assemblage; 2) a California Current assemblage; 3) a North Equatorial Current assemblage; 4) a Tropical Surface Water assemblage; 5) an oxygen minimum layer assemblage. A sixth assemblage appears to be the result of dissolution. The variation of these factors through the late Pleistocene is based on the analysis of samples from two cores. Transfer functions which relate core top assemblages to temperature at the sea surface and at 130 m depth were used to determine paleotemperatures. Stratigraphic control was provided by oxygen isotope analysis of planktonic foraminifera from one core, Synchronous levels in the other core were determined from biostratigraphic correlation of the variations in the abundance of three species of radiolaria between cores. A reconstruction of the paleoceanography based on the results of the above analyses indicates that during the last glacial maximum (18,000 yrs BP): 1) sea surface temperatures were slightly lower than today; 2) the areal extent of warm Pacific Equatorial water and Tropical Surface water was diminished; 3) the California Current, North Equatorial Current, and the Equatorial Current were stronger than at present; 4) there was an increase in the thermal gradient in the thermocline and/or an increase in the depth of the mixed layer; 5) air and sea surface circulation patterns were constricted and experienced minimal north-south oscillation.
Author: Harvey Maurice Sachs
Publisher:
ISBN:
Category :
Languages : en
Pages : 416
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Author: Warren O. Addicott
Publisher:
ISBN:
Category : Mollusks, Fossil
Languages : en
Pages : 44
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Invertebrate assemblages analogous to the Aleutain molluscan province indicate a former cool-temperate marine climate.
Author: World Data Center A--Oceanography
Publisher:
ISBN:
Category : Oceanography
Languages : en
Pages : 516
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Author: Geological Society of London
Publisher: Geological Society of London
ISBN: 9781862391819
Category : Science
Languages : en
Pages : 342
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The Early-Middle Pleistocene transition (around 1.2 to 0.5 Ma) marks a profound shift in Earth's climate state. Low-amplitude 41 ka climate cycles, dominating the earlier part of the Pleistocene, gave way progressively to a 100 ka rhythm of increased amplitude that characterizes our present glacial-interglacial world. This volume assesses the biotic and physical response to this transition both on land and in the oceans: indeed it examines the very nature of Quaternary climate change. Milankovitch theory, palaeoceanography using isotopes and microfossils, marine organic geochemistry, tephrochronology, the record of loess and soil deposition, terrestrial vegetational change, and the migration and evolution of hominins as well as other large and small mammals, are all considered. These themes combine to explore the very origins of our present biota.
Author: United States. Environmental Data Service
Publisher:
ISBN:
Category : Marine resources
Languages : en
Pages : 444
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Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 498
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