Late quaternary changes in the oceanography of the eastern tropical Pacific
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 Nort...
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ftoregonstate:ir.library.oregonstate.edu:9z903245f 2024-04-21T08:10:35+00:00 Late quaternary changes in the oceanography of the eastern tropical Pacific Wenkam, Chiye R. Thiede, Jorn Williamson, Kenneth Faulkenberry, David Quinn, William School of Oceanography Oregon State University. Graduate School https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9z903245f English [eng] eng unknown Oregon State University https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9z903245f Copyright Not Evaluated Oceanography -- Pacific Ocean Masters Thesis ftoregonstate 2024-03-28T01:43:44Z 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. Master Thesis Planktonic foraminifera ScholarsArchive@OSU (Oregon State University) |
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Open Polar |
collection |
ScholarsArchive@OSU (Oregon State University) |
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ftoregonstate |
language |
English unknown |
topic |
Oceanography -- Pacific Ocean |
spellingShingle |
Oceanography -- Pacific Ocean Wenkam, Chiye R. Late quaternary changes in the oceanography of the eastern tropical Pacific |
topic_facet |
Oceanography -- Pacific Ocean |
description |
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. |
author2 |
Thiede, Jorn Williamson, Kenneth Faulkenberry, David Quinn, William School of Oceanography Oregon State University. Graduate School |
format |
Master Thesis |
author |
Wenkam, Chiye R. |
author_facet |
Wenkam, Chiye R. |
author_sort |
Wenkam, Chiye R. |
title |
Late quaternary changes in the oceanography of the eastern tropical Pacific |
title_short |
Late quaternary changes in the oceanography of the eastern tropical Pacific |
title_full |
Late quaternary changes in the oceanography of the eastern tropical Pacific |
title_fullStr |
Late quaternary changes in the oceanography of the eastern tropical Pacific |
title_full_unstemmed |
Late quaternary changes in the oceanography of the eastern tropical Pacific |
title_sort |
late quaternary changes in the oceanography of the eastern tropical pacific |
publisher |
Oregon State University |
url |
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9z903245f |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9z903245f |
op_rights |
Copyright Not Evaluated |
_version_ |
1796952080841179136 |