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High-resolution windows into abrupt and millennial-scale changes in climate and ocean since the mid-Pleistocene transition, Santa Barbara Basin, California

Author: Sara Afshar
Publisher: [Long Beach, California] : California State University, Long Beach, 2011.
Dissertation: M.S. California State University, Long Beach 2011
Series: California State University, Long Beach.; Master's thesis collection, Dept. of Geological Sciences.
Edition/Format:   Thesis/dissertation : Thesis/dissertation   Computer File : English
Summary:
Abstract: Two high-resolution, multi-proxy records were produced for ~ 5-kyr windows at ~ 290 ka and ~ 735 ka, from piston cores acquired in Santa Barbara basin, California. These records show that abrupt, millennial- to sub-millennial-scale oscillations in weight % total organic carbon carbonate and, at lower resolution, biogenic silica, have occurred concurrent with climatic changes indicated by [delta]¹⁸O of  Read more...
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Details

Genre/Form: Academic theses
Material Type: Thesis/dissertation, Internet resource
Document Type: Book, Computer File, Internet Resource
All Authors / Contributors: Sara Afshar
ISBN: 9781267181381 1267181389
OCLC Number: 1076552936
Description: x, 135 leaves : illustrations, maps, charts (some color)
Series Title: California State University, Long Beach.; Master's thesis collection, Dept. of Geological Sciences.
Responsibility: by Sara Afshar.

Abstract:

Abstract: Two high-resolution, multi-proxy records were produced for ~ 5-kyr windows at ~ 290 ka and ~ 735 ka, from piston cores acquired in Santa Barbara basin, California. These records show that abrupt, millennial- to sub-millennial-scale oscillations in weight % total organic carbon carbonate and, at lower resolution, biogenic silica, have occurred concurrent with climatic changes indicated by [delta]¹⁸O of planktonic foraminifera Globigerina bulloides. These oscillations are similar in magnitude and periodicity to the Dansgaard-Oeschger events observed at Ocean Drilling Program (ODP) Site 893 during Marine Isotopic Stage 3. In both records, the relationships in the proxies suggest higher sea-surface temperatures and productivity, associated with decreased benthic oxygenation during interstadials that, at least at ~ 290 ka, resulted in anoxic conditions. Combined with ODP Site 893 data, these records provide three almost equally spaced datums for studying high-frequency climate behavior and the sensitivity of oceanic biogeochemical responses since the Mid-Pleistocene Transition.

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