Sea Level Pressure Variability Over the Southern Indian Ocean Inferred from a Glaciochemical Record in Princess Elizabeth Land, East Antarctica
A 250-year, high-resolution, multivariate ice core record from LGB65 (70degrees50'07"S, 77degrees04'29"E; 1850 m asl), Princess Elizabeth Land (PEL), is used to investigate sea level pressure (SLP) variability over the southern Indian Ocean (SIO). Empirical orthogonal function (E...
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ftmaineuniv:oai:digitalcommons.library.umaine.edu:ers_facpub-1077 2024-09-15T17:42:24+00:00 Sea Level Pressure Variability Over the Southern Indian Ocean Inferred from a Glaciochemical Record in Princess Elizabeth Land, East Antarctica Xiao, Cunde Mayewski, Paul Andrew Qin, Dahe Li, Zhongqin Zhang, Mingjun Yan, Yuping 2004-08-20T07:00:00Z application/pdf https://digitalcommons.library.umaine.edu/ers_facpub/78 https://doi.org/10.1029/2003JD004065 https://digitalcommons.library.umaine.edu/context/ers_facpub/article/1077/viewcontent/mayewski_109_D16101.pdf unknown DigitalCommons@UMaine https://digitalcommons.library.umaine.edu/ers_facpub/78 doi:10.1029/2003JD004065 https://digitalcommons.library.umaine.edu/context/ers_facpub/article/1077/viewcontent/mayewski_109_D16101.pdf This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. In addition, no permission is required from the rights-holder(s) for educational uses. For other uses, you need to obtain permission from the rights-holder(s). Earth Science Faculty Scholarship ice core east Antarctica southern Indian Ocean SLP polar vortex Earth Sciences text 2004 ftmaineuniv https://doi.org/10.1029/2003JD004065 2024-07-24T05:38:40Z A 250-year, high-resolution, multivariate ice core record from LGB65 (70degrees50'07"S, 77degrees04'29"E; 1850 m asl), Princess Elizabeth Land (PEL), is used to investigate sea level pressure (SLP) variability over the southern Indian Ocean (SIO). Empirical orthogonal function (EOF) analysis reveals that the first EOF (EOF1) of the glaciochemical record from LGB65 represents most of the variability in sea salt throughout the 250-year record. EOF1 is negatively correlated (95% confidence level and higher) to instrumental mean sea level pressure (MSLP) at Kerguelen and New Amsterdam islands, SIO. On the basis of comparison with NCEP/NCAR reanalysis, strong correlations were found between sea-salt variations and a quasi-stationary low that lies to the north of Prydz Bay, SIO. Comparison with a 250-year-long summer transpolar index (STPI) inferred from sub-Antarctic tree ring records reveals strong coherency. Decadal-scale SLP variability over SIO suggests shifting of the polar vortex. Prominent decadal-scale deepening of the southern Indian Ocean low (SIOL) exists circa 1790, 1810, 1835, 1860, 1880, 1900, and 1940 A. D., continuously after the 1970s, and prominent weakening circa 1750, 1795, 1825, 1850, 1870, 1890, 1910, and 1955 A. D. The LGB65 sea-salt record is characterized by significant decadal-scale variability with a strong similar to21-year periodic structure (99.9% confidence level). The relationship between LGB65 sea salt and solar irradiance changes shows that this periodicity is possibly the solar Hale cycle ( 22 years). Text Antarc* Antarctic Antarctica East Antarctica ice core Princess Elizabeth Land Prydz Bay The University of Maine: DigitalCommons@UMaine Journal of Geophysical Research: Atmospheres 109 D16 |
institution |
Open Polar |
collection |
The University of Maine: DigitalCommons@UMaine |
op_collection_id |
ftmaineuniv |
language |
unknown |
topic |
ice core east Antarctica southern Indian Ocean SLP polar vortex Earth Sciences |
spellingShingle |
ice core east Antarctica southern Indian Ocean SLP polar vortex Earth Sciences Xiao, Cunde Mayewski, Paul Andrew Qin, Dahe Li, Zhongqin Zhang, Mingjun Yan, Yuping Sea Level Pressure Variability Over the Southern Indian Ocean Inferred from a Glaciochemical Record in Princess Elizabeth Land, East Antarctica |
topic_facet |
ice core east Antarctica southern Indian Ocean SLP polar vortex Earth Sciences |
description |
A 250-year, high-resolution, multivariate ice core record from LGB65 (70degrees50'07"S, 77degrees04'29"E; 1850 m asl), Princess Elizabeth Land (PEL), is used to investigate sea level pressure (SLP) variability over the southern Indian Ocean (SIO). Empirical orthogonal function (EOF) analysis reveals that the first EOF (EOF1) of the glaciochemical record from LGB65 represents most of the variability in sea salt throughout the 250-year record. EOF1 is negatively correlated (95% confidence level and higher) to instrumental mean sea level pressure (MSLP) at Kerguelen and New Amsterdam islands, SIO. On the basis of comparison with NCEP/NCAR reanalysis, strong correlations were found between sea-salt variations and a quasi-stationary low that lies to the north of Prydz Bay, SIO. Comparison with a 250-year-long summer transpolar index (STPI) inferred from sub-Antarctic tree ring records reveals strong coherency. Decadal-scale SLP variability over SIO suggests shifting of the polar vortex. Prominent decadal-scale deepening of the southern Indian Ocean low (SIOL) exists circa 1790, 1810, 1835, 1860, 1880, 1900, and 1940 A. D., continuously after the 1970s, and prominent weakening circa 1750, 1795, 1825, 1850, 1870, 1890, 1910, and 1955 A. D. The LGB65 sea-salt record is characterized by significant decadal-scale variability with a strong similar to21-year periodic structure (99.9% confidence level). The relationship between LGB65 sea salt and solar irradiance changes shows that this periodicity is possibly the solar Hale cycle ( 22 years). |
format |
Text |
author |
Xiao, Cunde Mayewski, Paul Andrew Qin, Dahe Li, Zhongqin Zhang, Mingjun Yan, Yuping |
author_facet |
Xiao, Cunde Mayewski, Paul Andrew Qin, Dahe Li, Zhongqin Zhang, Mingjun Yan, Yuping |
author_sort |
Xiao, Cunde |
title |
Sea Level Pressure Variability Over the Southern Indian Ocean Inferred from a Glaciochemical Record in Princess Elizabeth Land, East Antarctica |
title_short |
Sea Level Pressure Variability Over the Southern Indian Ocean Inferred from a Glaciochemical Record in Princess Elizabeth Land, East Antarctica |
title_full |
Sea Level Pressure Variability Over the Southern Indian Ocean Inferred from a Glaciochemical Record in Princess Elizabeth Land, East Antarctica |
title_fullStr |
Sea Level Pressure Variability Over the Southern Indian Ocean Inferred from a Glaciochemical Record in Princess Elizabeth Land, East Antarctica |
title_full_unstemmed |
Sea Level Pressure Variability Over the Southern Indian Ocean Inferred from a Glaciochemical Record in Princess Elizabeth Land, East Antarctica |
title_sort |
sea level pressure variability over the southern indian ocean inferred from a glaciochemical record in princess elizabeth land, east antarctica |
publisher |
DigitalCommons@UMaine |
publishDate |
2004 |
url |
https://digitalcommons.library.umaine.edu/ers_facpub/78 https://doi.org/10.1029/2003JD004065 https://digitalcommons.library.umaine.edu/context/ers_facpub/article/1077/viewcontent/mayewski_109_D16101.pdf |
genre |
Antarc* Antarctic Antarctica East Antarctica ice core Princess Elizabeth Land Prydz Bay |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica ice core Princess Elizabeth Land Prydz Bay |
op_source |
Earth Science Faculty Scholarship |
op_relation |
https://digitalcommons.library.umaine.edu/ers_facpub/78 doi:10.1029/2003JD004065 https://digitalcommons.library.umaine.edu/context/ers_facpub/article/1077/viewcontent/mayewski_109_D16101.pdf |
op_rights |
This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. In addition, no permission is required from the rights-holder(s) for educational uses. For other uses, you need to obtain permission from the rights-holder(s). |
op_doi |
https://doi.org/10.1029/2003JD004065 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
109 |
container_issue |
D16 |
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1810488972721258496 |