Hydrologic change in New Zealand during the last deglaciation linked to reorganization of the Southern Hemisphere westerly winds
Millennial‐scale climate anomalies punctuating the last deglaciation were expressed differently in the Northern and Southern Hemispheres. While changes in oceanic meridional overturning circulation have been invoked to explain these disparities, the nearly synchronous onset of such events requires a...
Published in: | Paleoceanography and Paleoclimatology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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American Geophysical Union
2019
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Online Access: | https://authors.library.caltech.edu/100163/ https://authors.library.caltech.edu/100163/3/Hinojosa_et_al-2019-Paleoceanography_and_Paleoclimatology.pdf https://authors.library.caltech.edu/100163/2/palo20810-sup-0001-2019pa003656-si.pdf https://resolver.caltech.edu/CaltechAUTHORS:20191203-102139413 |
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ftcaltechauth:oai:authors.library.caltech.edu:100163 2023-05-15T13:38:16+02:00 Hydrologic change in New Zealand during the last deglaciation linked to reorganization of the Southern Hemisphere westerly winds Hinojosa, Jessica L. Moy, Christopher M. Vandergoes, Marcus Feakins, Sarah J. Sessions, Alex L. 2019-12 application/pdf https://authors.library.caltech.edu/100163/ https://authors.library.caltech.edu/100163/3/Hinojosa_et_al-2019-Paleoceanography_and_Paleoclimatology.pdf https://authors.library.caltech.edu/100163/2/palo20810-sup-0001-2019pa003656-si.pdf https://resolver.caltech.edu/CaltechAUTHORS:20191203-102139413 en eng American Geophysical Union https://authors.library.caltech.edu/100163/3/Hinojosa_et_al-2019-Paleoceanography_and_Paleoclimatology.pdf https://authors.library.caltech.edu/100163/2/palo20810-sup-0001-2019pa003656-si.pdf Hinojosa, Jessica L. and Moy, Christopher M. and Vandergoes, Marcus and Feakins, Sarah J. and Sessions, Alex L. (2019) Hydrologic change in New Zealand during the last deglaciation linked to reorganization of the Southern Hemisphere westerly winds. Paleoceanography and Paleoclimatology, 34 (12). pp. 2158-2170. ISSN 2572-4517. doi:10.1029/2019pa003656. https://resolver.caltech.edu/CaltechAUTHORS:20191203-102139413 <https://resolver.caltech.edu/CaltechAUTHORS:20191203-102139413> other Article PeerReviewed 2019 ftcaltechauth https://doi.org/10.1029/2019pa003656 2021-11-18T18:53:05Z Millennial‐scale climate anomalies punctuating the last deglaciation were expressed differently in the Northern and Southern Hemispheres. While changes in oceanic meridional overturning circulation have been invoked to explain these disparities, the nearly synchronous onset of such events requires atmospheric mediation. Yet the extent and structure of atmospheric reorganization on millennial timescales remains unclear. In particular, the role of the Southern Hemisphere westerly winds (SHWW) and associated storm tracks is poorly constrained, largely due to the paucity of accessible archives of wind behavior. Here we present a new paleohydrologic record from a Lake Hayes, New Zealand (45° S) sediment core from ~17‐9 ka. Using two independent proxies for lake hydrology (Ca/Ti in sediments and δD values of aquatic plant biomarkers), we find evidence for a wetter Antarctic Cold Reversal (ACR, 14.7‐13.0 ka) and a drying trend during the Younger Dryas (YD, 12.9‐11.6 ka) and early Holocene (11.7 ka onward in this record). Comparisons of the Lake Hayes record with other Southern Hemisphere sites indicate coherent atmospheric shifts during the ACR and YD, whereby the former is wetter/cooler and the latter is drier/warmer. The wet/cool phase is associated with a northward shift and/or strengthening of the SHWW, whereas the drier/warmer phase indicates weaker mid‐latitude winds. These climatic trends are opposite to the Northern Hemisphere. There is a decoupling of climatic trends between Southern Hemisphere low‐ and mid‐latitude climates in the early Holocene, which could be explained by several mechanisms, such as the retreat of Antarctic sea ice. Article in Journal/Newspaper Antarc* Antarctic Sea ice Caltech Authors (California Institute of Technology) Antarctic Hayes ENVELOPE(-64.167,-64.167,-66.833,-66.833) New Zealand Paleoceanography and Paleoclimatology 34 12 2158 2170 |
institution |
Open Polar |
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Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
language |
English |
description |
Millennial‐scale climate anomalies punctuating the last deglaciation were expressed differently in the Northern and Southern Hemispheres. While changes in oceanic meridional overturning circulation have been invoked to explain these disparities, the nearly synchronous onset of such events requires atmospheric mediation. Yet the extent and structure of atmospheric reorganization on millennial timescales remains unclear. In particular, the role of the Southern Hemisphere westerly winds (SHWW) and associated storm tracks is poorly constrained, largely due to the paucity of accessible archives of wind behavior. Here we present a new paleohydrologic record from a Lake Hayes, New Zealand (45° S) sediment core from ~17‐9 ka. Using two independent proxies for lake hydrology (Ca/Ti in sediments and δD values of aquatic plant biomarkers), we find evidence for a wetter Antarctic Cold Reversal (ACR, 14.7‐13.0 ka) and a drying trend during the Younger Dryas (YD, 12.9‐11.6 ka) and early Holocene (11.7 ka onward in this record). Comparisons of the Lake Hayes record with other Southern Hemisphere sites indicate coherent atmospheric shifts during the ACR and YD, whereby the former is wetter/cooler and the latter is drier/warmer. The wet/cool phase is associated with a northward shift and/or strengthening of the SHWW, whereas the drier/warmer phase indicates weaker mid‐latitude winds. These climatic trends are opposite to the Northern Hemisphere. There is a decoupling of climatic trends between Southern Hemisphere low‐ and mid‐latitude climates in the early Holocene, which could be explained by several mechanisms, such as the retreat of Antarctic sea ice. |
format |
Article in Journal/Newspaper |
author |
Hinojosa, Jessica L. Moy, Christopher M. Vandergoes, Marcus Feakins, Sarah J. Sessions, Alex L. |
spellingShingle |
Hinojosa, Jessica L. Moy, Christopher M. Vandergoes, Marcus Feakins, Sarah J. Sessions, Alex L. Hydrologic change in New Zealand during the last deglaciation linked to reorganization of the Southern Hemisphere westerly winds |
author_facet |
Hinojosa, Jessica L. Moy, Christopher M. Vandergoes, Marcus Feakins, Sarah J. Sessions, Alex L. |
author_sort |
Hinojosa, Jessica L. |
title |
Hydrologic change in New Zealand during the last deglaciation linked to reorganization of the Southern Hemisphere westerly winds |
title_short |
Hydrologic change in New Zealand during the last deglaciation linked to reorganization of the Southern Hemisphere westerly winds |
title_full |
Hydrologic change in New Zealand during the last deglaciation linked to reorganization of the Southern Hemisphere westerly winds |
title_fullStr |
Hydrologic change in New Zealand during the last deglaciation linked to reorganization of the Southern Hemisphere westerly winds |
title_full_unstemmed |
Hydrologic change in New Zealand during the last deglaciation linked to reorganization of the Southern Hemisphere westerly winds |
title_sort |
hydrologic change in new zealand during the last deglaciation linked to reorganization of the southern hemisphere westerly winds |
publisher |
American Geophysical Union |
publishDate |
2019 |
url |
https://authors.library.caltech.edu/100163/ https://authors.library.caltech.edu/100163/3/Hinojosa_et_al-2019-Paleoceanography_and_Paleoclimatology.pdf https://authors.library.caltech.edu/100163/2/palo20810-sup-0001-2019pa003656-si.pdf https://resolver.caltech.edu/CaltechAUTHORS:20191203-102139413 |
long_lat |
ENVELOPE(-64.167,-64.167,-66.833,-66.833) |
geographic |
Antarctic Hayes New Zealand |
geographic_facet |
Antarctic Hayes New Zealand |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_relation |
https://authors.library.caltech.edu/100163/3/Hinojosa_et_al-2019-Paleoceanography_and_Paleoclimatology.pdf https://authors.library.caltech.edu/100163/2/palo20810-sup-0001-2019pa003656-si.pdf Hinojosa, Jessica L. and Moy, Christopher M. and Vandergoes, Marcus and Feakins, Sarah J. and Sessions, Alex L. (2019) Hydrologic change in New Zealand during the last deglaciation linked to reorganization of the Southern Hemisphere westerly winds. Paleoceanography and Paleoclimatology, 34 (12). pp. 2158-2170. ISSN 2572-4517. doi:10.1029/2019pa003656. https://resolver.caltech.edu/CaltechAUTHORS:20191203-102139413 <https://resolver.caltech.edu/CaltechAUTHORS:20191203-102139413> |
op_rights |
other |
op_doi |
https://doi.org/10.1029/2019pa003656 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
34 |
container_issue |
12 |
container_start_page |
2158 |
op_container_end_page |
2170 |
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1766103283827474432 |