Simultaneous presence of orbital inclination and eccentricity in proxy climate records from Ocean Drilling Program Site 806
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Research Article| January 01, 1997 Simultaneous presence of orbital inclination and eccentricity in proxy climate records from Ocean Drilling Program Site 806 Richard A. Muller; Richard A. Muller 1Department of Physics, University of California, Berkeley California 94720 Search for other works by this author on: GSW Google Scholar Gordon J. MacDonald Gordon J. MacDonald 2International Institute for Applied Systems Analysis, A-2361 Laxenburg, Austria Search for other works by this author on: GSW Google Scholar Geology (1997) 25 (1): 3–6. https://doi.org/10.1130/0091-7613(1997)025<0003:SPOOIA>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Richard A. Muller, Gordon J. MacDonald; Simultaneous presence of orbital inclination and eccentricity in proxy climate records from Ocean Drilling Program Site 806. Geology 1997;; 25 (1): 3–6. doi: https://doi.org/10.1130/0091-7613(1997)025<0003:SPOOIA>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Ocean Drilling Program Site 806 in the western Pacific shows evidence of a remarkably constant average sedimentation rate. This feature allows us to analyze ancient climate proxies without the need for “orbital tuning,” a standard procedure in prior work, but one that can lead to biased results. Spectral analysis of stable oxygen isotope ratios at this site, a proxy for global ice volume, shows a single narrow peak with a period ≈ 100 k.y., a result that supports our model which links glacial cycles to variations in the inclination of the Earth's orbit. In contrast, spectral analysis of the coarse component fraction of the sediment (primarily foraminifera) shows a structure characteristic of standard Milankovitch theory, with a triplet of peaks with periods near those expected from the Earth's eccentricity: 95, 125, and 400 k.y. Bispectral analysis confirms these linkages but suggests that orbital inclination also plays some role in the coarse fraction. From the clear presence of both signals in different proxies at the same site, we conclude that although eccentricity affected the local climate, it is orbital inclination that drove the variations in the global ice volume for the past million years. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.Keywords:
Proxy (statistics)
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