Southern Hemisphere climate variability forced by Northern Hemisphere ice-sheet topography
The presence of large Northern Hemisphere ice sheets and reduced greenhouse gas concentrations during the Last Glacial Maximum fundamentally altered global ocean–atmosphere climate dynamics1. Model simulations and palaeoclimate records suggest that glacial boundary conditions affected the El Niño–So...
Published in: | Nature |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Nature Publishing
2018
|
Subjects: | |
Online Access: | https://nrl.northumbria.ac.uk/id/eprint/35257/ https://doi.org/10.1038/nature24669 |
id |
ftunivnorthumb:oai:nrl.northumbria.ac.uk:35257 |
---|---|
record_format |
openpolar |
spelling |
ftunivnorthumb:oai:nrl.northumbria.ac.uk:35257 2023-05-15T13:56:54+02:00 Southern Hemisphere climate variability forced by Northern Hemisphere ice-sheet topography Jones, T. R. Roberts, William Steig, E. J. Cuffey, K. M. Markle, B. R. White, J. W. 2018-02-15 https://nrl.northumbria.ac.uk/id/eprint/35257/ https://doi.org/10.1038/nature24669 unknown Nature Publishing Jones, T. R., Roberts, William, Steig, E. J., Cuffey, K. M., Markle, B. R. and White, J. W. (2018) Southern Hemisphere climate variability forced by Northern Hemisphere ice-sheet topography. Nature, 554 (7692). pp. 351-355. ISSN 0028-0836 F800 Physical and Terrestrial Geographical and Environmental Sciences Article PeerReviewed 2018 ftunivnorthumb https://doi.org/10.1038/nature24669 2022-09-25T06:07:47Z The presence of large Northern Hemisphere ice sheets and reduced greenhouse gas concentrations during the Last Glacial Maximum fundamentally altered global ocean–atmosphere climate dynamics1. Model simulations and palaeoclimate records suggest that glacial boundary conditions affected the El Niño–Southern Oscillation2,3, a dominant source of short-term global climate variability. Yet little is known about changes in short-term climate variability at mid- to high latitudes. Here we use a high-resolution water isotope record from West Antarctica to demonstrate that interannual to decadal climate variability at high southern latitudes was almost twice as large at the Last Glacial Maximum as during the ensuing Holocene epoch (the past 11,700 years). Climate model simulations indicate that this increased variability reflects an increase in the teleconnection strength between the tropical Pacific and West Antarctica, owing to a shift in the mean location of tropical convection. This shift, in turn, can be attributed to the influence of topography and albedo of the North American ice sheets on atmospheric circulation. As the planet deglaciated, the largest and most abrupt decline in teleconnection strength occurred between approximately 16,000 years and 15,000 years ago, followed by a slower decline into the early Holocene. Article in Journal/Newspaper Antarc* Antarctica Ice Sheet West Antarctica Northumbria University, Newcastle: Northumbria Research Link (NRL) Pacific West Antarctica Nature 554 7692 351 355 |
institution |
Open Polar |
collection |
Northumbria University, Newcastle: Northumbria Research Link (NRL) |
op_collection_id |
ftunivnorthumb |
language |
unknown |
topic |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
spellingShingle |
F800 Physical and Terrestrial Geographical and Environmental Sciences Jones, T. R. Roberts, William Steig, E. J. Cuffey, K. M. Markle, B. R. White, J. W. Southern Hemisphere climate variability forced by Northern Hemisphere ice-sheet topography |
topic_facet |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
description |
The presence of large Northern Hemisphere ice sheets and reduced greenhouse gas concentrations during the Last Glacial Maximum fundamentally altered global ocean–atmosphere climate dynamics1. Model simulations and palaeoclimate records suggest that glacial boundary conditions affected the El Niño–Southern Oscillation2,3, a dominant source of short-term global climate variability. Yet little is known about changes in short-term climate variability at mid- to high latitudes. Here we use a high-resolution water isotope record from West Antarctica to demonstrate that interannual to decadal climate variability at high southern latitudes was almost twice as large at the Last Glacial Maximum as during the ensuing Holocene epoch (the past 11,700 years). Climate model simulations indicate that this increased variability reflects an increase in the teleconnection strength between the tropical Pacific and West Antarctica, owing to a shift in the mean location of tropical convection. This shift, in turn, can be attributed to the influence of topography and albedo of the North American ice sheets on atmospheric circulation. As the planet deglaciated, the largest and most abrupt decline in teleconnection strength occurred between approximately 16,000 years and 15,000 years ago, followed by a slower decline into the early Holocene. |
format |
Article in Journal/Newspaper |
author |
Jones, T. R. Roberts, William Steig, E. J. Cuffey, K. M. Markle, B. R. White, J. W. |
author_facet |
Jones, T. R. Roberts, William Steig, E. J. Cuffey, K. M. Markle, B. R. White, J. W. |
author_sort |
Jones, T. R. |
title |
Southern Hemisphere climate variability forced by Northern Hemisphere ice-sheet topography |
title_short |
Southern Hemisphere climate variability forced by Northern Hemisphere ice-sheet topography |
title_full |
Southern Hemisphere climate variability forced by Northern Hemisphere ice-sheet topography |
title_fullStr |
Southern Hemisphere climate variability forced by Northern Hemisphere ice-sheet topography |
title_full_unstemmed |
Southern Hemisphere climate variability forced by Northern Hemisphere ice-sheet topography |
title_sort |
southern hemisphere climate variability forced by northern hemisphere ice-sheet topography |
publisher |
Nature Publishing |
publishDate |
2018 |
url |
https://nrl.northumbria.ac.uk/id/eprint/35257/ https://doi.org/10.1038/nature24669 |
geographic |
Pacific West Antarctica |
geographic_facet |
Pacific West Antarctica |
genre |
Antarc* Antarctica Ice Sheet West Antarctica |
genre_facet |
Antarc* Antarctica Ice Sheet West Antarctica |
op_relation |
Jones, T. R., Roberts, William, Steig, E. J., Cuffey, K. M., Markle, B. R. and White, J. W. (2018) Southern Hemisphere climate variability forced by Northern Hemisphere ice-sheet topography. Nature, 554 (7692). pp. 351-355. ISSN 0028-0836 |
op_doi |
https://doi.org/10.1038/nature24669 |
container_title |
Nature |
container_volume |
554 |
container_issue |
7692 |
container_start_page |
351 |
op_container_end_page |
355 |
_version_ |
1766264499110674432 |