Mismatch of glacier extent and summer insolation in Southern Hemisphere mid-latitudes
Here in this paper, we address a long-standing puzzle of ice-age climate called the “fly in the ointment of the Milankovitch theory.” Using geomorphic mapping and 10 Be surface-exposure dating, we show that five moraine belts were formed during maxima of the last ice age by the Pukaki glacier in New...
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Online Access: | http://www.osti.gov/servlets/purl/1418503 https://www.osti.gov/biblio/1418503 https://doi.org/10.1130/G36477.1 |
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ftosti:oai:osti.gov:1418503 2023-07-30T04:07:02+02:00 Mismatch of glacier extent and summer insolation in Southern Hemisphere mid-latitudes Doughty, Alice M. Schaefer, Joerg M. Putnam, Aaron E. Denton, George H. Kaplan, Michael R. Barrell, David J. A. Andersen, Bjørn G. Kelley, Samuel E. Finkel, Robert C. Schwartz, Roseanne 2021-07-26 application/pdf http://www.osti.gov/servlets/purl/1418503 https://www.osti.gov/biblio/1418503 https://doi.org/10.1130/G36477.1 unknown http://www.osti.gov/servlets/purl/1418503 https://www.osti.gov/biblio/1418503 https://doi.org/10.1130/G36477.1 doi:10.1130/G36477.1 58 GEOSCIENCES 2021 ftosti https://doi.org/10.1130/G36477.1 2023-07-11T09:23:50Z Here in this paper, we address a long-standing puzzle of ice-age climate called the “fly in the ointment of the Milankovitch theory.” Using geomorphic mapping and 10 Be surface-exposure dating, we show that five moraine belts were formed during maxima of the last ice age by the Pukaki glacier in New Zealand’s Southern Alps. They afford ages of 41.76 ± 1.09 ka, 35.50 ± 1.26 ka, 27.17 ± 0.68 ka, 20.27 ± 0.60 ka, and 18.29 ± 0.49 ka. These five maxima spanned an entire precessional cycle in summer insolation intensity at the latitude of the Southern Alps. A similar mismatch between summer insolation and glacier extent also characterized the Chilean Lake District in the mid-latitudes of South America. Thus, in apparent contrast to northern ice sheets linked by Milankovitch to summer insolation at 65°N latitude, the behavior of southern mid-latitude glaciers was not tied to local summer insolation intensity. Instead, glacier extent between 41.76 ka and 18.29 ka, as well as during the last termination, was aligned with Southern Ocean surface temperature and with atmospheric carbon dioxide. Other/Unknown Material Southern Ocean SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Pukaki ENVELOPE(162.100,162.100,-82.817,-82.817) Southern Ocean Geology 43 5 407 410 |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
58 GEOSCIENCES |
spellingShingle |
58 GEOSCIENCES Doughty, Alice M. Schaefer, Joerg M. Putnam, Aaron E. Denton, George H. Kaplan, Michael R. Barrell, David J. A. Andersen, Bjørn G. Kelley, Samuel E. Finkel, Robert C. Schwartz, Roseanne Mismatch of glacier extent and summer insolation in Southern Hemisphere mid-latitudes |
topic_facet |
58 GEOSCIENCES |
description |
Here in this paper, we address a long-standing puzzle of ice-age climate called the “fly in the ointment of the Milankovitch theory.” Using geomorphic mapping and 10 Be surface-exposure dating, we show that five moraine belts were formed during maxima of the last ice age by the Pukaki glacier in New Zealand’s Southern Alps. They afford ages of 41.76 ± 1.09 ka, 35.50 ± 1.26 ka, 27.17 ± 0.68 ka, 20.27 ± 0.60 ka, and 18.29 ± 0.49 ka. These five maxima spanned an entire precessional cycle in summer insolation intensity at the latitude of the Southern Alps. A similar mismatch between summer insolation and glacier extent also characterized the Chilean Lake District in the mid-latitudes of South America. Thus, in apparent contrast to northern ice sheets linked by Milankovitch to summer insolation at 65°N latitude, the behavior of southern mid-latitude glaciers was not tied to local summer insolation intensity. Instead, glacier extent between 41.76 ka and 18.29 ka, as well as during the last termination, was aligned with Southern Ocean surface temperature and with atmospheric carbon dioxide. |
author |
Doughty, Alice M. Schaefer, Joerg M. Putnam, Aaron E. Denton, George H. Kaplan, Michael R. Barrell, David J. A. Andersen, Bjørn G. Kelley, Samuel E. Finkel, Robert C. Schwartz, Roseanne |
author_facet |
Doughty, Alice M. Schaefer, Joerg M. Putnam, Aaron E. Denton, George H. Kaplan, Michael R. Barrell, David J. A. Andersen, Bjørn G. Kelley, Samuel E. Finkel, Robert C. Schwartz, Roseanne |
author_sort |
Doughty, Alice M. |
title |
Mismatch of glacier extent and summer insolation in Southern Hemisphere mid-latitudes |
title_short |
Mismatch of glacier extent and summer insolation in Southern Hemisphere mid-latitudes |
title_full |
Mismatch of glacier extent and summer insolation in Southern Hemisphere mid-latitudes |
title_fullStr |
Mismatch of glacier extent and summer insolation in Southern Hemisphere mid-latitudes |
title_full_unstemmed |
Mismatch of glacier extent and summer insolation in Southern Hemisphere mid-latitudes |
title_sort |
mismatch of glacier extent and summer insolation in southern hemisphere mid-latitudes |
publishDate |
2021 |
url |
http://www.osti.gov/servlets/purl/1418503 https://www.osti.gov/biblio/1418503 https://doi.org/10.1130/G36477.1 |
long_lat |
ENVELOPE(162.100,162.100,-82.817,-82.817) |
geographic |
Pukaki Southern Ocean |
geographic_facet |
Pukaki Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
http://www.osti.gov/servlets/purl/1418503 https://www.osti.gov/biblio/1418503 https://doi.org/10.1130/G36477.1 doi:10.1130/G36477.1 |
op_doi |
https://doi.org/10.1130/G36477.1 |
container_title |
Geology |
container_volume |
43 |
container_issue |
5 |
container_start_page |
407 |
op_container_end_page |
410 |
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1772820119773249536 |