A 700 year record of Southern Hemisphere extratropical climate variability
Annually dated ice cores from West and East Antarctica provide proxies for past changes in atmospheric circulation over Antarctica and portions of the Southern Ocean, temperature in coastal West and East Antarctica, and the frequency of South Polar penetration of El Niño events. During the period AD...
Main Authors: | , , , , , , , , , , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
University of New Hampshire Scholars' Repository
2004
|
Subjects: | |
Online Access: | https://scholars.unh.edu/ersc/38 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1037&context=ersc |
id |
ftuninhampshire:oai:scholars.unh.edu:ersc-1037 |
---|---|
record_format |
openpolar |
spelling |
ftuninhampshire:oai:scholars.unh.edu:ersc-1037 2023-05-15T13:24:12+02:00 A 700 year record of Southern Hemisphere extratropical climate variability Mayewski, Paul A Maasch, Kirk A White, James W.C. Steig, Eric J Meyerson, E A Goodwin, Ian D Morgan, Vin van Ommen, Tas D Curran, Mark AJ Souney, Joseph M, Jr Kreutz, K 2004-06-01T07:00:00Z application/pdf https://scholars.unh.edu/ersc/38 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1037&context=ersc unknown University of New Hampshire Scholars' Repository https://scholars.unh.edu/ersc/38 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1037&context=ersc Earth Systems Research Center Atmospheric Sciences Climate Glaciology text 2004 ftuninhampshire 2023-01-30T21:38:40Z Annually dated ice cores from West and East Antarctica provide proxies for past changes in atmospheric circulation over Antarctica and portions of the Southern Ocean, temperature in coastal West and East Antarctica, and the frequency of South Polar penetration of El Niño events. During the period AD 1700–1850, atmospheric circulation over the Antarctic and at least portions of the Southern Hemisphere underwent a mode switch departing from the out-of-phase alternation of multi-decadal long phases of EOF1 and EOF2 modes of the 850 hPa field over the Southern Hemisphere (as defined in the recent record by Thompson and Wallace, 2000; Thompson and Solomon, 2002) that characterizes the remainder of the 700 year long record. From AD 1700 to 1850, lower-tropospheric circulation was replaced by in-phase behavior of the Amundsen Sea Low component of EOF2 and the East Antarctic High component of EOF1. During the first phase of the mode switch, both West and East Antarctic temperatures declined, potentially in response to the increased extent of sea ice surrounding both regions. At the end of the mode switch, West Antarctic coastal temperatures rose and East Antarctic coastal temperatures fell, respectively, to their second highest and lowest of the record. Polar penetration of El Niño events increased during the mode switch. The onset of the AD 1700–1850 mode switch coincides with the extreme state of the Maunder Minimum in solar variability. Late 20th-century West Antarctic coastal temperatures are the highest in the record period, and East Antarctic coastal temperatures close to the lowest. Since AD 1700, extratropical regions of the Southern Hemisphere have experienced significant climate variability coincident with changes in both solar variability and greenhouse gases Text Amundsen Sea Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean University of New Hampshire: Scholars Repository Antarctic Southern Ocean The Antarctic East Antarctica Amundsen Sea |
institution |
Open Polar |
collection |
University of New Hampshire: Scholars Repository |
op_collection_id |
ftuninhampshire |
language |
unknown |
topic |
Atmospheric Sciences Climate Glaciology |
spellingShingle |
Atmospheric Sciences Climate Glaciology Mayewski, Paul A Maasch, Kirk A White, James W.C. Steig, Eric J Meyerson, E A Goodwin, Ian D Morgan, Vin van Ommen, Tas D Curran, Mark AJ Souney, Joseph M, Jr Kreutz, K A 700 year record of Southern Hemisphere extratropical climate variability |
topic_facet |
Atmospheric Sciences Climate Glaciology |
description |
Annually dated ice cores from West and East Antarctica provide proxies for past changes in atmospheric circulation over Antarctica and portions of the Southern Ocean, temperature in coastal West and East Antarctica, and the frequency of South Polar penetration of El Niño events. During the period AD 1700–1850, atmospheric circulation over the Antarctic and at least portions of the Southern Hemisphere underwent a mode switch departing from the out-of-phase alternation of multi-decadal long phases of EOF1 and EOF2 modes of the 850 hPa field over the Southern Hemisphere (as defined in the recent record by Thompson and Wallace, 2000; Thompson and Solomon, 2002) that characterizes the remainder of the 700 year long record. From AD 1700 to 1850, lower-tropospheric circulation was replaced by in-phase behavior of the Amundsen Sea Low component of EOF2 and the East Antarctic High component of EOF1. During the first phase of the mode switch, both West and East Antarctic temperatures declined, potentially in response to the increased extent of sea ice surrounding both regions. At the end of the mode switch, West Antarctic coastal temperatures rose and East Antarctic coastal temperatures fell, respectively, to their second highest and lowest of the record. Polar penetration of El Niño events increased during the mode switch. The onset of the AD 1700–1850 mode switch coincides with the extreme state of the Maunder Minimum in solar variability. Late 20th-century West Antarctic coastal temperatures are the highest in the record period, and East Antarctic coastal temperatures close to the lowest. Since AD 1700, extratropical regions of the Southern Hemisphere have experienced significant climate variability coincident with changes in both solar variability and greenhouse gases |
format |
Text |
author |
Mayewski, Paul A Maasch, Kirk A White, James W.C. Steig, Eric J Meyerson, E A Goodwin, Ian D Morgan, Vin van Ommen, Tas D Curran, Mark AJ Souney, Joseph M, Jr Kreutz, K |
author_facet |
Mayewski, Paul A Maasch, Kirk A White, James W.C. Steig, Eric J Meyerson, E A Goodwin, Ian D Morgan, Vin van Ommen, Tas D Curran, Mark AJ Souney, Joseph M, Jr Kreutz, K |
author_sort |
Mayewski, Paul A |
title |
A 700 year record of Southern Hemisphere extratropical climate variability |
title_short |
A 700 year record of Southern Hemisphere extratropical climate variability |
title_full |
A 700 year record of Southern Hemisphere extratropical climate variability |
title_fullStr |
A 700 year record of Southern Hemisphere extratropical climate variability |
title_full_unstemmed |
A 700 year record of Southern Hemisphere extratropical climate variability |
title_sort |
700 year record of southern hemisphere extratropical climate variability |
publisher |
University of New Hampshire Scholars' Repository |
publishDate |
2004 |
url |
https://scholars.unh.edu/ersc/38 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1037&context=ersc |
geographic |
Antarctic Southern Ocean The Antarctic East Antarctica Amundsen Sea |
geographic_facet |
Antarctic Southern Ocean The Antarctic East Antarctica Amundsen Sea |
genre |
Amundsen Sea Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean |
op_source |
Earth Systems Research Center |
op_relation |
https://scholars.unh.edu/ersc/38 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1037&context=ersc |
_version_ |
1766378039131766784 |