Climatic and oceanographic variations on the California continental margin during the last 160 kyr

Author(s): Mangelsdorf, Kai; Güntner, Ute; Rullkötter, Jürgen
Author Affiliation(s): Primary:
Carl von Ossietzky University of Oldenburg, Institute of Chemistry and Biology of the Marine Environment (ICBM), Oldenburg, Federal Republic of Germany
Volume Title: Organic Geochemistry
Source: Organic Geochemistry, 31(9), p.829-846. Publisher: Pergamon, Oxford-New York, International. ISSN: 0146-6380
Note: In English. 54 refs.; illus., incl. 3 tables, sketch maps
Summary: Organic matter in sediment samples from three ODP sites (Ocean Drilling Program Leg 167) that form a south-north transect was investigated to reconstruct the paleoclimatic and oceanographic conditions on the California continental margin during the last 160 kyr. Alkenone-derived paleosea surface temperatures (SST) are 3 to 6°C colder in glacial stages and reveal a clear relationship with global climate changes; the differences are greater in the north. Latitudinal SST comparison exhibits water mixing of the colder California Current with warmer waters from the south, particularly in the southern central California borderland area. Organic matter accumulation on the California continental margin indicates an interplay between climatic and atmospheric glacial-interglacial variations and spatially and temporally changing nutrient availability along the California coastline. Climatic and atmospheric dependent circulations apparently caused variations in the intensity of coastal upwelling along the southern central California margin and this suggests, due to the close connection of the California Current to the local wind patterns, that the California Current was weaker during glacial and stronger during interglacial periods. Abstract Copyright (2000) Elsevier, B.V.
Year of Publication: 2000
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 24 Surficial Geology, Quaternary Geology; Alcohols; Aliphatic hydrocarbons; Alkanes; Alkenones; Biochemical sedimentation; Biomarkers; C-13/C-12; California; California Current; Carbon; Cenozoic; Chronostratigraphy; Climate change; Coastal environment; Continental margin; Continental margin sedimentation; Currents; Dinosterol; East Pacific; Foraminifera; Geochemistry; Glacial environment; Glaciomarine environment; Global change; Hydrocarbons; Hydrochemistry; Interglacial environment; Invertebrata; Isotope ratios; Isotopes; Ketones; Leg 146; Leg 167; Marine environment; Marine sediments; N-alkanes; North Pacific; Northeast Pacific; Nutrients; ODP Site 1017; ODP Site 1018; ODP Site 1019; ODP Site 893; Ocean Drilling Program; Ocean circulation; Ocean currents; Organic carbon; Organic compounds; Pacific Ocean; Paleo-oceanography; Paleocirculation; Paleoclimatology; Planktonic taxa; Protista; Quaternary; Sea-surface temperature; Sedimentation; Sedimentation rates; Sediments; Stable isotopes; Steroids; Sterols; Total organic carbon; United States; Upper Quaternary; Upwelling
Coordinates: N341715 N341715 W1200211 W1200212
N414058 N414058 W1245559 W1245559
Record ID: 2000071736
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands