Observed Antarctic interannual climate variability and tropical linkages
This study reviews the mechanisms associated with Antarctic–tropical climate linkages and presents new analyses of the seasonality and spatial patterns of tropical climate signals in the Antarctic for the late 1950s to the present. Tropical climate signals are primarily communicated to the Antarctic...
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American Meteorological Society
2012
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ftncar:oai:drupal-site.org:articles_11581 2023-09-05T13:13:17+02:00 Observed Antarctic interannual climate variability and tropical linkages Schneider, David (author) Okumura, Yuko (author) Deser, Clara (author) 2012-06-01 application/pdf http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-003-798 https://doi.org/10.1175/JCLI-D-11-00273.1 en eng American Meteorological Society Journal of Climate http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-003-798 doi:10.1175/JCLI-D-11-00273.1 ark:/85065/d737799w Copyright 2012 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work. Antarctica Teleconnections Antarctic Oscillation ENSO Text article 2012 ftncar https://doi.org/10.1175/JCLI-D-11-00273.1 2023-08-14T18:40:16Z This study reviews the mechanisms associated with Antarctic–tropical climate linkages and presents new analyses of the seasonality and spatial patterns of tropical climate signals in the Antarctic for the late 1950s to the present. Tropical climate signals are primarily communicated to the Antarctic via the Pacific–South America (PSA) pattern and the southern annular mode (SAM). The impacts of these circulation patterns and their tropical linkages are evident in regressions of seasonally stratified Antarctic station temperature data and annually resolved ice core records on global fields of sea surface temperature, sea level pressure, and precipitation. Temperature and ice core anomalies in the Antarctic Peninsula region and adjoining areas of West Antarctica are significantly impacted by the PSA, interpreted as a Rossby wave train driven by anomalous tropical deep convection during ENSO events. This pattern is most evident in the austral spring, consistent with recent studies, suggesting that atmospheric conditions for Rossby wave propagation are most favorable during this season. During austral summer at the peak of the ENSO cycle, temperature anomalies at East Antarctic coastal stations exhibit significant correlations with tropical Pacific anomalies. This linkage reflects the influence of anomalous tropical heating on the position and strength of the subtropical jets and is consistent with changes in eddy momentum fluxes that alter the mean meridional circulation associated with the SAM. Of the ice cores that exhibit tropical linkages, most tend to be associated with the PSA teleconnection. The implications of the study’s findings for understanding Antarctic climate variability and climate change from seasonal to decadal time scales are also discussed. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica ice core West Antarctica OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Antarctic Antarctic Peninsula Austral Pacific The Antarctic West Antarctica Journal of Climate 25 12 4048 4066 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
topic |
Antarctica Teleconnections Antarctic Oscillation ENSO |
spellingShingle |
Antarctica Teleconnections Antarctic Oscillation ENSO Observed Antarctic interannual climate variability and tropical linkages |
topic_facet |
Antarctica Teleconnections Antarctic Oscillation ENSO |
description |
This study reviews the mechanisms associated with Antarctic–tropical climate linkages and presents new analyses of the seasonality and spatial patterns of tropical climate signals in the Antarctic for the late 1950s to the present. Tropical climate signals are primarily communicated to the Antarctic via the Pacific–South America (PSA) pattern and the southern annular mode (SAM). The impacts of these circulation patterns and their tropical linkages are evident in regressions of seasonally stratified Antarctic station temperature data and annually resolved ice core records on global fields of sea surface temperature, sea level pressure, and precipitation. Temperature and ice core anomalies in the Antarctic Peninsula region and adjoining areas of West Antarctica are significantly impacted by the PSA, interpreted as a Rossby wave train driven by anomalous tropical deep convection during ENSO events. This pattern is most evident in the austral spring, consistent with recent studies, suggesting that atmospheric conditions for Rossby wave propagation are most favorable during this season. During austral summer at the peak of the ENSO cycle, temperature anomalies at East Antarctic coastal stations exhibit significant correlations with tropical Pacific anomalies. This linkage reflects the influence of anomalous tropical heating on the position and strength of the subtropical jets and is consistent with changes in eddy momentum fluxes that alter the mean meridional circulation associated with the SAM. Of the ice cores that exhibit tropical linkages, most tend to be associated with the PSA teleconnection. The implications of the study’s findings for understanding Antarctic climate variability and climate change from seasonal to decadal time scales are also discussed. |
author2 |
Schneider, David (author) Okumura, Yuko (author) Deser, Clara (author) |
format |
Article in Journal/Newspaper |
title |
Observed Antarctic interannual climate variability and tropical linkages |
title_short |
Observed Antarctic interannual climate variability and tropical linkages |
title_full |
Observed Antarctic interannual climate variability and tropical linkages |
title_fullStr |
Observed Antarctic interannual climate variability and tropical linkages |
title_full_unstemmed |
Observed Antarctic interannual climate variability and tropical linkages |
title_sort |
observed antarctic interannual climate variability and tropical linkages |
publisher |
American Meteorological Society |
publishDate |
2012 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-003-798 https://doi.org/10.1175/JCLI-D-11-00273.1 |
geographic |
Antarctic Antarctic Peninsula Austral Pacific The Antarctic West Antarctica |
geographic_facet |
Antarctic Antarctic Peninsula Austral Pacific The Antarctic West Antarctica |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica ice core West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica ice core West Antarctica |
op_relation |
Journal of Climate http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-003-798 doi:10.1175/JCLI-D-11-00273.1 ark:/85065/d737799w |
op_rights |
Copyright 2012 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work. |
op_doi |
https://doi.org/10.1175/JCLI-D-11-00273.1 |
container_title |
Journal of Climate |
container_volume |
25 |
container_issue |
12 |
container_start_page |
4048 |
op_container_end_page |
4066 |
_version_ |
1776204442209615872 |