Filtering of Milankovitch Cycles by Earth's Geography
Abstract Earth's land-sea distribution modifies the temperature response to orbitally induced perturbations of the seasonal insolation. We examine this modification in the frequency domain by generating 800,000-yr time series of maximum summer temperature in selected regions with a linear, two-...
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Cambridge University Press (CUP)
1991
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crcambridgeupr:10.1016/0033-5894(91)90064-c 2024-10-13T14:02:08+00:00 Filtering of Milankovitch Cycles by Earth's Geography Short, David A. Mengel, John G. Crowley, Thomas J. Hyde, William T. North, Gerald R. 1991 http://dx.doi.org/10.1016/0033-5894(91)90064-c http://api.elsevier.com/content/article/PII:003358949190064C?httpAccept=text/xml http://api.elsevier.com/content/article/PII:003358949190064C?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400021281 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 35, issue 2, page 157-173 ISSN 0033-5894 1096-0287 journal-article 1991 crcambridgeupr https://doi.org/10.1016/0033-5894(91)90064-c 2024-09-18T04:02:44Z Abstract Earth's land-sea distribution modifies the temperature response to orbitally induced perturbations of the seasonal insolation. We examine this modification in the frequency domain by generating 800,000-yr time series of maximum summer temperature in selected regions with a linear, two-dimensional, seasonal energy balance climate model. Previous studies have demonstrated that this model has a sensitivity comparable to general circulation models for the seasonal temperature response to orbital forcing on land. Although the observed response in the geologic record is sometimes significantly different than modeled here (differences attributable to model limitations and feedbacks involving the ocean-atmosphere-cryosphere system), there are several results of significance: (1) in mid-latitude land areas the orbital signal is translated linearly into a large (>10°C) seasonal temperature response; (2) although the modeled seasonal response to orbital forcing on Antarctica is 6°C, the annual mean temperature effect (<2°C) is only about one-fifth that inferred from the Vostok ice core, and primarily restricted to periods near 41,000 yr; (3) equatorial regions have the richest spectrum of temperature response, with a 3000-yr phase shift in the precession response, plus some power near periods of 10,000–12,000 yr, 41,000 yr, 100,000 yr, and 400,000 yr. Peaks at 10,000–12,000 yr and 100,000 and 400,000 yr result from the twice-yearly passage of the sun across the equator. The complex model response in equatorial regions has some resemblance to geologic time series from this region. The amplification of model response over equatorial land masses at the 100,000-yr period may explain some of the observed large variance in this band in geologic records, especially in pre-Pleistocene records from times of little or no global ice volume. Article in Journal/Newspaper Antarc* Antarctica ice core Cambridge University Press Quaternary Research 35 2 157 173 |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Earth's land-sea distribution modifies the temperature response to orbitally induced perturbations of the seasonal insolation. We examine this modification in the frequency domain by generating 800,000-yr time series of maximum summer temperature in selected regions with a linear, two-dimensional, seasonal energy balance climate model. Previous studies have demonstrated that this model has a sensitivity comparable to general circulation models for the seasonal temperature response to orbital forcing on land. Although the observed response in the geologic record is sometimes significantly different than modeled here (differences attributable to model limitations and feedbacks involving the ocean-atmosphere-cryosphere system), there are several results of significance: (1) in mid-latitude land areas the orbital signal is translated linearly into a large (>10°C) seasonal temperature response; (2) although the modeled seasonal response to orbital forcing on Antarctica is 6°C, the annual mean temperature effect (<2°C) is only about one-fifth that inferred from the Vostok ice core, and primarily restricted to periods near 41,000 yr; (3) equatorial regions have the richest spectrum of temperature response, with a 3000-yr phase shift in the precession response, plus some power near periods of 10,000–12,000 yr, 41,000 yr, 100,000 yr, and 400,000 yr. Peaks at 10,000–12,000 yr and 100,000 and 400,000 yr result from the twice-yearly passage of the sun across the equator. The complex model response in equatorial regions has some resemblance to geologic time series from this region. The amplification of model response over equatorial land masses at the 100,000-yr period may explain some of the observed large variance in this band in geologic records, especially in pre-Pleistocene records from times of little or no global ice volume. |
format |
Article in Journal/Newspaper |
author |
Short, David A. Mengel, John G. Crowley, Thomas J. Hyde, William T. North, Gerald R. |
spellingShingle |
Short, David A. Mengel, John G. Crowley, Thomas J. Hyde, William T. North, Gerald R. Filtering of Milankovitch Cycles by Earth's Geography |
author_facet |
Short, David A. Mengel, John G. Crowley, Thomas J. Hyde, William T. North, Gerald R. |
author_sort |
Short, David A. |
title |
Filtering of Milankovitch Cycles by Earth's Geography |
title_short |
Filtering of Milankovitch Cycles by Earth's Geography |
title_full |
Filtering of Milankovitch Cycles by Earth's Geography |
title_fullStr |
Filtering of Milankovitch Cycles by Earth's Geography |
title_full_unstemmed |
Filtering of Milankovitch Cycles by Earth's Geography |
title_sort |
filtering of milankovitch cycles by earth's geography |
publisher |
Cambridge University Press (CUP) |
publishDate |
1991 |
url |
http://dx.doi.org/10.1016/0033-5894(91)90064-c http://api.elsevier.com/content/article/PII:003358949190064C?httpAccept=text/xml http://api.elsevier.com/content/article/PII:003358949190064C?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400021281 |
genre |
Antarc* Antarctica ice core |
genre_facet |
Antarc* Antarctica ice core |
op_source |
Quaternary Research volume 35, issue 2, page 157-173 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/0033-5894(91)90064-c |
container_title |
Quaternary Research |
container_volume |
35 |
container_issue |
2 |
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157 |
op_container_end_page |
173 |
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1812815093004500992 |