Does the bipolar seesaw extend to the terrestrial southern mid-latitudes?
High precision comparison of Greenland and Antarctic ice cores, suggesting a pervasive antiphased temperature relationship between the polar hemispheres during the last glaciation, lends strong support to the bipolar seesaw model (EPICA, 2006). The extent to which reorganisation of ocean-heat transp...
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ftunivwaikato:oai:researchcommons.waikato.ac.nz:10289/5462 2024-01-21T10:00:46+01:00 Does the bipolar seesaw extend to the terrestrial southern mid-latitudes? Newnham, Rewi M. Vandergoes, Marcus J. Sikes, Elisabeth Carter, Lionel Wilmshurst, Janet M. Lowe, David J. McGlone, Matt S. Sandiford, Anna 2011 https://hdl.handle.net/10289/5462 https://doi.org/10.1016/j.quascirev.2011.04.013 en eng Elsevier http://www.sciencedirect.com/science/article/pii/S0277379111001156 Quaternary Science Reviews Newnham, R.M., Vandergoes, M.J., Sikes, E., Carter, L., Wilmshurst, J.M.,…, Sandiford, A. (2011). Does the bipolar seesaw extend to the terrestrial southern mid-latitudes? Quaternary Science Reviews, available online 31 May 2011. https://hdl.handle.net/10289/5462 doi:10.1016/j.quascirev.2011.04.013 bipolar seesaw extended LGM LGIT Lateglacial reversal Antarctic isotope maxima ACR YD NZ-INTIMATE palynology tephrochronology Journal Article 2011 ftunivwaikato https://doi.org/10.1016/j.quascirev.2011.04.013 2023-12-26T18:25:26Z High precision comparison of Greenland and Antarctic ice cores, suggesting a pervasive antiphased temperature relationship between the polar hemispheres during the last glaciation, lends strong support to the bipolar seesaw model (EPICA, 2006). The extent to which reorganisation of ocean-heat transport during abrupt climate change events affected the southern mid-latitudes remains unclear, however, owing to a paucity of well-dated records with robust climate proxies, variability between some records, and varying interpretations of their significance. Here we present temperature reconstructions for three key pollen records recognised by the NZ-INTIMATE (NZ-I) group which, along with the preliminary NZ-I climate event stratigraphy (Alloway et al., 2007) and published marine records, are compared with polar ice core records for the interval 30–10 cal. ka. We focus on key events within the context of Dansgard Oeschger cycles 4–1 and The Antarctic Cold Reversal/Younger Dryas intervals. The New Zealand records are broadly consistent with an extended bipolar seesaw whereby the oceanic southern mid-latitudes are warmed at times of MOC weakening or cessation in the North Atlantic, and vice versa. Variability between records indicate that other factors must be involved, however, and nor do these records refute alternative models that predict an antiphased inter-hemispheric pattern. Nevertheless an extended bipolar model may explain an early onset of LGM conditions in New Zealand and elsewhere in the Southern Hemisphere at a time when interstadials GI3 and GI4 kept Greenland warm. Similar inter-hemispheric dynamics have been invoked to explain an earlier termination of the LGM in Antarctica than in Greenland (Wolff et al., 2009) which is also evident in the New Zealand records. A prominent mid-LGM interstadial complex observed in several New Zealand records, connected by tephrochronology may represent another antiphased event although stronger chronological control is needed to support this assertion. By comparison, the ... Article in Journal/Newspaper Antarc* Antarctic Antarctica EPICA Greenland ice core North Atlantic The University of Waikato: Research Commons Antarctic The Antarctic Greenland New Zealand Quaternary Science Reviews 36 214 222 |
institution |
Open Polar |
collection |
The University of Waikato: Research Commons |
op_collection_id |
ftunivwaikato |
language |
English |
topic |
bipolar seesaw extended LGM LGIT Lateglacial reversal Antarctic isotope maxima ACR YD NZ-INTIMATE palynology tephrochronology |
spellingShingle |
bipolar seesaw extended LGM LGIT Lateglacial reversal Antarctic isotope maxima ACR YD NZ-INTIMATE palynology tephrochronology Newnham, Rewi M. Vandergoes, Marcus J. Sikes, Elisabeth Carter, Lionel Wilmshurst, Janet M. Lowe, David J. McGlone, Matt S. Sandiford, Anna Does the bipolar seesaw extend to the terrestrial southern mid-latitudes? |
topic_facet |
bipolar seesaw extended LGM LGIT Lateglacial reversal Antarctic isotope maxima ACR YD NZ-INTIMATE palynology tephrochronology |
description |
High precision comparison of Greenland and Antarctic ice cores, suggesting a pervasive antiphased temperature relationship between the polar hemispheres during the last glaciation, lends strong support to the bipolar seesaw model (EPICA, 2006). The extent to which reorganisation of ocean-heat transport during abrupt climate change events affected the southern mid-latitudes remains unclear, however, owing to a paucity of well-dated records with robust climate proxies, variability between some records, and varying interpretations of their significance. Here we present temperature reconstructions for three key pollen records recognised by the NZ-INTIMATE (NZ-I) group which, along with the preliminary NZ-I climate event stratigraphy (Alloway et al., 2007) and published marine records, are compared with polar ice core records for the interval 30–10 cal. ka. We focus on key events within the context of Dansgard Oeschger cycles 4–1 and The Antarctic Cold Reversal/Younger Dryas intervals. The New Zealand records are broadly consistent with an extended bipolar seesaw whereby the oceanic southern mid-latitudes are warmed at times of MOC weakening or cessation in the North Atlantic, and vice versa. Variability between records indicate that other factors must be involved, however, and nor do these records refute alternative models that predict an antiphased inter-hemispheric pattern. Nevertheless an extended bipolar model may explain an early onset of LGM conditions in New Zealand and elsewhere in the Southern Hemisphere at a time when interstadials GI3 and GI4 kept Greenland warm. Similar inter-hemispheric dynamics have been invoked to explain an earlier termination of the LGM in Antarctica than in Greenland (Wolff et al., 2009) which is also evident in the New Zealand records. A prominent mid-LGM interstadial complex observed in several New Zealand records, connected by tephrochronology may represent another antiphased event although stronger chronological control is needed to support this assertion. By comparison, the ... |
format |
Article in Journal/Newspaper |
author |
Newnham, Rewi M. Vandergoes, Marcus J. Sikes, Elisabeth Carter, Lionel Wilmshurst, Janet M. Lowe, David J. McGlone, Matt S. Sandiford, Anna |
author_facet |
Newnham, Rewi M. Vandergoes, Marcus J. Sikes, Elisabeth Carter, Lionel Wilmshurst, Janet M. Lowe, David J. McGlone, Matt S. Sandiford, Anna |
author_sort |
Newnham, Rewi M. |
title |
Does the bipolar seesaw extend to the terrestrial southern mid-latitudes? |
title_short |
Does the bipolar seesaw extend to the terrestrial southern mid-latitudes? |
title_full |
Does the bipolar seesaw extend to the terrestrial southern mid-latitudes? |
title_fullStr |
Does the bipolar seesaw extend to the terrestrial southern mid-latitudes? |
title_full_unstemmed |
Does the bipolar seesaw extend to the terrestrial southern mid-latitudes? |
title_sort |
does the bipolar seesaw extend to the terrestrial southern mid-latitudes? |
publisher |
Elsevier |
publishDate |
2011 |
url |
https://hdl.handle.net/10289/5462 https://doi.org/10.1016/j.quascirev.2011.04.013 |
geographic |
Antarctic The Antarctic Greenland New Zealand |
geographic_facet |
Antarctic The Antarctic Greenland New Zealand |
genre |
Antarc* Antarctic Antarctica EPICA Greenland ice core North Atlantic |
genre_facet |
Antarc* Antarctic Antarctica EPICA Greenland ice core North Atlantic |
op_relation |
http://www.sciencedirect.com/science/article/pii/S0277379111001156 Quaternary Science Reviews Newnham, R.M., Vandergoes, M.J., Sikes, E., Carter, L., Wilmshurst, J.M.,…, Sandiford, A. (2011). Does the bipolar seesaw extend to the terrestrial southern mid-latitudes? Quaternary Science Reviews, available online 31 May 2011. https://hdl.handle.net/10289/5462 doi:10.1016/j.quascirev.2011.04.013 |
op_doi |
https://doi.org/10.1016/j.quascirev.2011.04.013 |
container_title |
Quaternary Science Reviews |
container_volume |
36 |
container_start_page |
214 |
op_container_end_page |
222 |
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1788703549657448448 |