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

doi:10.1130/G36477.1

Title: Mismatch of glacier extent and summer insolation in Southern Hemisphere mid-latitudes

Journal Article · Fri May 01 00:00:00 EDT 2015 · Geology

DOI:https://doi.org/10.1130/G36477.1· OSTI ID:1418503

Doughty, Alice M. ^[1]; Schaefer, Joerg M. ^[2]; Putnam, Aaron E. ^[3]; Denton, George H. ^[4]; Kaplan, Michael R. ^[5]; Barrell, David J. A. ^[6]; Andersen, Bjørn G. ^[7]; Kelley, Samuel E. ^[8]; Finkel, Robert C. ^[9]; Schwartz, Roseanne ^[5]

Dartmouth College, Hanover, NH (United States). Dept. of Earth Sciences; Univ. of Maine, Orono, ME (United States). School of Earth and Climate Sciences and Climate Change Inst.
Columbia Univ., Palisades, NY (United States). Lamont-Doherty Earth Observatory; Columbia Univ., New York, NY (United States). Dept. of Earth and Environmental Sciences
Univ. of Maine, Orono, ME (United States). School of Earth and Climate Sciences and Climate Change Inst.; Columbia Univ., Palisades, NY (United States). Lamont-Doherty Earth Observatory
Univ. of Maine, Orono, ME (United States). School of Earth and Climate Sciences and Climate Change Inst.
Columbia Univ., Palisades, NY (United States). Lamont-Doherty Earth Observatory
GNS Science, Dunedin (New Zealand)
Univ. of Oslo (Norway). Dept. of Geosciences
Dept. of Earth and Environmental Sciences, Waterloo, ON (Canada)
Univ. of California, Berkeley, CA (United States). Dept. of Earth and Planetary Sciences; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

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 ¹⁰Be 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.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE

OSTI ID:: 1418503

Journal Information:: Geology, Vol. 43, Issue 5; ISSN 0091-7613

Publisher:: Geological Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 49 works

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Cited By (3)

Dynamics of former ice lobes of the southernmost Patagonian Ice Sheet based on a glacial landsystems approach: DYNAMICS OF THE SOUTHERNMOST PATAGONIAN ICE SHEET Darvill, Christopher M.; Stokes, Chris R.; Bentley, Michael J. Journal of Quaternary Science, Vol. 32, Issue 6 https://doi.org/10.1002/jqs.2890	journal	September 2016
Deglacial temperature history of West Antarctica Cuffey, Kurt M.; Clow, Gary D.; Steig, Eric J. Proceedings of the National Academy of Sciences, Vol. 113, Issue 50 https://doi.org/10.1073/pnas.1609132113	journal	November 2016
MIS 3 glaciation in the middle Rakaia valley, New Zealand, documented through stratigraphy and luminescence geochronology Thackray, Glenn D.; Shulmeister, James; Hyatt, Olivia M. New Zealand Journal of Geology and Geophysics, Vol. 60, Issue 4 https://doi.org/10.1080/00288306.2017.1342664	journal	July 2017

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