A study of sub-orbital and millennial-scale climate variability over the past 1.4 million years in the Northern Atlantic
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, February 2000. "August 1999." Includes bibliographical references (p. 72-73). Spectral methods are used to determine if there are any instances of narrow band oscillations in the clim...
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ftmit:oai:dspace.mit.edu:1721.1/17480 2023-06-11T04:14:58+02:00 A study of sub-orbital and millennial-scale climate variability over the past 1.4 million years in the Northern Atlantic Coles, Darrell Ardon, 1971- Maureen Raymo. Massachusetts Institute of Technology. Dept. of Earth, Atmospheric, and Planetary Sciences. 2000 73 p. 3567298 bytes 3567106 bytes application/pdf http://hdl.handle.net/1721.1/17480 eng eng Massachusetts Institute of Technology http://hdl.handle.net/1721.1/17480 44622904 M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 Earth Atmospheric and Planetary Sciences Thesis 2000 ftmit 2023-05-29T07:32:17Z Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, February 2000. "August 1999." Includes bibliographical references (p. 72-73). Spectral methods are used to determine if there are any instances of narrow band oscillations in the climate signal over the past 1.4 million years. The study focuses on the suborbital and millennial-scale regime (~ 1 .5 - 20.0 kyr periodicities) at Site 980 and 983, two deep sea drill sites in the North Atlantic gathered by the Ocean Drilling Program in 1995. The study suggests one such narrow band oscillation in the sediment profile at Site 983, which is discussed from a variety of perspectives. Other questions addressed include a discussion of potential age-model inadequacies deriving from a potentially 'under-resolved' marine isotope map, as regards high-frequency climate variability. Site 983 has a 4-component sediment profile while Site 980 has a 2- component profile. This paper attempts to resolve the various independent inputs at Site 983 by the method described above. Four proxies have been used in this study; they are magnetic susceptibility, natural gamma, spectral reflectance, and GRAPE (Gamma Ray Attenuation Porosity Evaluator). These proxies are used to inform the millennial-scale issue by coherence methods and are also assessed to see which proxies may prove most useful in future high frequency research. Finally, a variety of mathematical and statistical methods have been employed including multi-taper analysis with different numbers of Slepian tapers, Singular Spectrum Analysis (SSA), noise background estimation methods (Mann and Lees, 1996), Akaike' s Information Criterion for AR(n) model fitting to a data set, and chi-square distribution confidence intervals. These various methods are discussed and evaluated according to their usefulness in sub-orbital research. by Darrell Ardon Coles. S.M. Thesis North Atlantic DSpace@MIT (Massachusetts Institute of Technology) |
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language |
English |
topic |
Earth Atmospheric and Planetary Sciences |
spellingShingle |
Earth Atmospheric and Planetary Sciences Coles, Darrell Ardon, 1971- A study of sub-orbital and millennial-scale climate variability over the past 1.4 million years in the Northern Atlantic |
topic_facet |
Earth Atmospheric and Planetary Sciences |
description |
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, February 2000. "August 1999." Includes bibliographical references (p. 72-73). Spectral methods are used to determine if there are any instances of narrow band oscillations in the climate signal over the past 1.4 million years. The study focuses on the suborbital and millennial-scale regime (~ 1 .5 - 20.0 kyr periodicities) at Site 980 and 983, two deep sea drill sites in the North Atlantic gathered by the Ocean Drilling Program in 1995. The study suggests one such narrow band oscillation in the sediment profile at Site 983, which is discussed from a variety of perspectives. Other questions addressed include a discussion of potential age-model inadequacies deriving from a potentially 'under-resolved' marine isotope map, as regards high-frequency climate variability. Site 983 has a 4-component sediment profile while Site 980 has a 2- component profile. This paper attempts to resolve the various independent inputs at Site 983 by the method described above. Four proxies have been used in this study; they are magnetic susceptibility, natural gamma, spectral reflectance, and GRAPE (Gamma Ray Attenuation Porosity Evaluator). These proxies are used to inform the millennial-scale issue by coherence methods and are also assessed to see which proxies may prove most useful in future high frequency research. Finally, a variety of mathematical and statistical methods have been employed including multi-taper analysis with different numbers of Slepian tapers, Singular Spectrum Analysis (SSA), noise background estimation methods (Mann and Lees, 1996), Akaike' s Information Criterion for AR(n) model fitting to a data set, and chi-square distribution confidence intervals. These various methods are discussed and evaluated according to their usefulness in sub-orbital research. by Darrell Ardon Coles. S.M. |
author2 |
Maureen Raymo. Massachusetts Institute of Technology. Dept. of Earth, Atmospheric, and Planetary Sciences. |
format |
Thesis |
author |
Coles, Darrell Ardon, 1971- |
author_facet |
Coles, Darrell Ardon, 1971- |
author_sort |
Coles, Darrell Ardon, 1971- |
title |
A study of sub-orbital and millennial-scale climate variability over the past 1.4 million years in the Northern Atlantic |
title_short |
A study of sub-orbital and millennial-scale climate variability over the past 1.4 million years in the Northern Atlantic |
title_full |
A study of sub-orbital and millennial-scale climate variability over the past 1.4 million years in the Northern Atlantic |
title_fullStr |
A study of sub-orbital and millennial-scale climate variability over the past 1.4 million years in the Northern Atlantic |
title_full_unstemmed |
A study of sub-orbital and millennial-scale climate variability over the past 1.4 million years in the Northern Atlantic |
title_sort |
study of sub-orbital and millennial-scale climate variability over the past 1.4 million years in the northern atlantic |
publisher |
Massachusetts Institute of Technology |
publishDate |
2000 |
url |
http://hdl.handle.net/1721.1/17480 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://hdl.handle.net/1721.1/17480 44622904 |
op_rights |
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 |
_version_ |
1768371395435167744 |