Onset of deglacial warming in West Antarctica driven by local orbital forcing
The cause of warming in the Southern Hemisphere during the most recent deglaciation remains a matter of debate. Hypotheses for a Northern Hemisphere trigger, through oceanic redistributions of heat, are based in part on the abrupt onset of warming seen in East Antarctic ice cores and dated to 18,000...
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ftcdlib:oai:escholarship.org:ark:/13030/qt1hm5g8hj 2023-09-05T13:14:20+02:00 Onset of deglacial warming in West Antarctica driven by local orbital forcing Fudge, TJ Steig, Eric J Markle, Bradley R Schoenemann, Spruce W Ding, Qinghua Taylor, Kendrick C McConnell, Joseph R Brook, Edward J Sowers, Todd White, James WC Alley, Richard B Cheng, Hai Clow, Gary D Cole-Dai, Jihong Conway, Howard Cuffey, Kurt M Edwards, Jon S Edwards, R Lawrence Edwards, Ross Fegyveresi, John M Ferris, David Fitzpatrick, Joan J Johnson, Jay Hargreaves, Geoffrey Lee, James E Maselli, Olivia J Mason, William McGwire, Kenneth C Mitchell, Logan E Mortensen, Nicolai Neff, Peter Orsi, Anais J Popp, Trevor J Schauer, Andrew J Severinghaus, Jeffrey P Sigl, Michael Spencer, Matthew K Vaughn, Bruce H Voigt, Donald E Waddington, Edwin D Wang, Xianfeng Wong, Gifford J 440 - 444 2013-08-01 application/pdf https://escholarship.org/uc/item/1hm5g8hj unknown eScholarship, University of California qt1hm5g8hj https://escholarship.org/uc/item/1hm5g8hj public Nature, vol 500, iss 7463 Antarctic Regions Atmosphere Carbon Dioxide Global Warming History Ancient Ice Cover Methane Models Theoretical Oceans and Seas Oxygen Isotopes Seawater Snow Sodium Chloride Temperature Time Factors Water Movements WAIS Divide Project Members General Science & Technology article 2013 ftcdlib 2023-08-21T18:06:32Z The cause of warming in the Southern Hemisphere during the most recent deglaciation remains a matter of debate. Hypotheses for a Northern Hemisphere trigger, through oceanic redistributions of heat, are based in part on the abrupt onset of warming seen in East Antarctic ice cores and dated to 18,000 years ago, which is several thousand years after high-latitude Northern Hemisphere summer insolation intensity began increasing from its minimum, approximately 24,000 years ago. An alternative explanation is that local solar insolation changes cause the Southern Hemisphere to warm independently. Here we present results from a new, annually resolved ice-core record from West Antarctica that reconciles these two views. The records show that 18,000 years ago snow accumulation in West Antarctica began increasing, coincident with increasing carbon dioxide concentrations, warming in East Antarctica and cooling in the Northern Hemisphere associated with an abrupt decrease in Atlantic meridional overturning circulation. However, significant warming in West Antarctica began at least 2,000 years earlier. Circum-Antarctic sea-ice decline, driven by increasing local insolation, is the likely cause of this warming. The marine-influenced West Antarctic records suggest a more active role for the Southern Ocean in the onset of deglaciation than is inferred from ice cores in the East Antarctic interior, which are largely isolated from sea-ice changes. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica ice core Sea ice Southern Ocean West Antarctica University of California: eScholarship Antarctic Southern Ocean East Antarctica West Antarctica |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Antarctic Regions Atmosphere Carbon Dioxide Global Warming History Ancient Ice Cover Methane Models Theoretical Oceans and Seas Oxygen Isotopes Seawater Snow Sodium Chloride Temperature Time Factors Water Movements WAIS Divide Project Members General Science & Technology |
spellingShingle |
Antarctic Regions Atmosphere Carbon Dioxide Global Warming History Ancient Ice Cover Methane Models Theoretical Oceans and Seas Oxygen Isotopes Seawater Snow Sodium Chloride Temperature Time Factors Water Movements WAIS Divide Project Members General Science & Technology Fudge, TJ Steig, Eric J Markle, Bradley R Schoenemann, Spruce W Ding, Qinghua Taylor, Kendrick C McConnell, Joseph R Brook, Edward J Sowers, Todd White, James WC Alley, Richard B Cheng, Hai Clow, Gary D Cole-Dai, Jihong Conway, Howard Cuffey, Kurt M Edwards, Jon S Edwards, R Lawrence Edwards, Ross Fegyveresi, John M Ferris, David Fitzpatrick, Joan J Johnson, Jay Hargreaves, Geoffrey Lee, James E Maselli, Olivia J Mason, William McGwire, Kenneth C Mitchell, Logan E Mortensen, Nicolai Neff, Peter Orsi, Anais J Popp, Trevor J Schauer, Andrew J Severinghaus, Jeffrey P Sigl, Michael Spencer, Matthew K Vaughn, Bruce H Voigt, Donald E Waddington, Edwin D Wang, Xianfeng Wong, Gifford J Onset of deglacial warming in West Antarctica driven by local orbital forcing |
topic_facet |
Antarctic Regions Atmosphere Carbon Dioxide Global Warming History Ancient Ice Cover Methane Models Theoretical Oceans and Seas Oxygen Isotopes Seawater Snow Sodium Chloride Temperature Time Factors Water Movements WAIS Divide Project Members General Science & Technology |
description |
The cause of warming in the Southern Hemisphere during the most recent deglaciation remains a matter of debate. Hypotheses for a Northern Hemisphere trigger, through oceanic redistributions of heat, are based in part on the abrupt onset of warming seen in East Antarctic ice cores and dated to 18,000 years ago, which is several thousand years after high-latitude Northern Hemisphere summer insolation intensity began increasing from its minimum, approximately 24,000 years ago. An alternative explanation is that local solar insolation changes cause the Southern Hemisphere to warm independently. Here we present results from a new, annually resolved ice-core record from West Antarctica that reconciles these two views. The records show that 18,000 years ago snow accumulation in West Antarctica began increasing, coincident with increasing carbon dioxide concentrations, warming in East Antarctica and cooling in the Northern Hemisphere associated with an abrupt decrease in Atlantic meridional overturning circulation. However, significant warming in West Antarctica began at least 2,000 years earlier. Circum-Antarctic sea-ice decline, driven by increasing local insolation, is the likely cause of this warming. The marine-influenced West Antarctic records suggest a more active role for the Southern Ocean in the onset of deglaciation than is inferred from ice cores in the East Antarctic interior, which are largely isolated from sea-ice changes. |
format |
Article in Journal/Newspaper |
author |
Fudge, TJ Steig, Eric J Markle, Bradley R Schoenemann, Spruce W Ding, Qinghua Taylor, Kendrick C McConnell, Joseph R Brook, Edward J Sowers, Todd White, James WC Alley, Richard B Cheng, Hai Clow, Gary D Cole-Dai, Jihong Conway, Howard Cuffey, Kurt M Edwards, Jon S Edwards, R Lawrence Edwards, Ross Fegyveresi, John M Ferris, David Fitzpatrick, Joan J Johnson, Jay Hargreaves, Geoffrey Lee, James E Maselli, Olivia J Mason, William McGwire, Kenneth C Mitchell, Logan E Mortensen, Nicolai Neff, Peter Orsi, Anais J Popp, Trevor J Schauer, Andrew J Severinghaus, Jeffrey P Sigl, Michael Spencer, Matthew K Vaughn, Bruce H Voigt, Donald E Waddington, Edwin D Wang, Xianfeng Wong, Gifford J |
author_facet |
Fudge, TJ Steig, Eric J Markle, Bradley R Schoenemann, Spruce W Ding, Qinghua Taylor, Kendrick C McConnell, Joseph R Brook, Edward J Sowers, Todd White, James WC Alley, Richard B Cheng, Hai Clow, Gary D Cole-Dai, Jihong Conway, Howard Cuffey, Kurt M Edwards, Jon S Edwards, R Lawrence Edwards, Ross Fegyveresi, John M Ferris, David Fitzpatrick, Joan J Johnson, Jay Hargreaves, Geoffrey Lee, James E Maselli, Olivia J Mason, William McGwire, Kenneth C Mitchell, Logan E Mortensen, Nicolai Neff, Peter Orsi, Anais J Popp, Trevor J Schauer, Andrew J Severinghaus, Jeffrey P Sigl, Michael Spencer, Matthew K Vaughn, Bruce H Voigt, Donald E Waddington, Edwin D Wang, Xianfeng Wong, Gifford J |
author_sort |
Fudge, TJ |
title |
Onset of deglacial warming in West Antarctica driven by local orbital forcing |
title_short |
Onset of deglacial warming in West Antarctica driven by local orbital forcing |
title_full |
Onset of deglacial warming in West Antarctica driven by local orbital forcing |
title_fullStr |
Onset of deglacial warming in West Antarctica driven by local orbital forcing |
title_full_unstemmed |
Onset of deglacial warming in West Antarctica driven by local orbital forcing |
title_sort |
onset of deglacial warming in west antarctica driven by local orbital forcing |
publisher |
eScholarship, University of California |
publishDate |
2013 |
url |
https://escholarship.org/uc/item/1hm5g8hj |
op_coverage |
440 - 444 |
geographic |
Antarctic Southern Ocean East Antarctica West Antarctica |
geographic_facet |
Antarctic Southern Ocean East Antarctica West Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica ice core Sea ice Southern Ocean West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica ice core Sea ice Southern Ocean West Antarctica |
op_source |
Nature, vol 500, iss 7463 |
op_relation |
qt1hm5g8hj https://escholarship.org/uc/item/1hm5g8hj |
op_rights |
public |
_version_ |
1776205325471318016 |