Teleconnection and the Antarctic response to the Indian Ocean Dipole in CMIP5 and CMIP6 models
Abstract Tropical–Antarctic teleconnections are known to have large impacts on Antarctic climate variability at multiple timescales. Anomalous tropical convection triggers upper‐level quasi‐stationary Rossby waves, which propagate to high southern latitudes and impact the local environment. Here the...
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crwiley:10.1002/qj.4854 2024-09-30T14:22:30+00:00 Teleconnection and the Antarctic response to the Indian Ocean Dipole in CMIP5 and CMIP6 models Sen, Arnab Deb, Pranab Matthews, Adrian J. Joshi, Manoj M. Indian Institute of Technology Kharagpur 2024 http://dx.doi.org/10.1002/qj.4854 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.4854 en eng Wiley http://creativecommons.org/licenses/by-nc-nd/4.0/ Quarterly Journal of the Royal Meteorological Society ISSN 0035-9009 1477-870X journal-article 2024 crwiley https://doi.org/10.1002/qj.4854 2024-09-17T04:51:27Z Abstract Tropical–Antarctic teleconnections are known to have large impacts on Antarctic climate variability at multiple timescales. Anomalous tropical convection triggers upper‐level quasi‐stationary Rossby waves, which propagate to high southern latitudes and impact the local environment. Here the teleconnection between the Indian Ocean Dipole (IOD) and Antarctica was examined using daily gridded reanalysis data and the linear response theory method (LRTM) during September–November of 1980–2015. The individual contribution of the IOD over the Antarctic climate is challenging to quantify, as positive IOD events often co‐occur with El Niño events. However, using the LRTM, the extratropical response due to a positive IOD was successfully extracted from the combined signal in the composite map of anomalous 250‐hPa geopotential height. Applying the method to a set of models from phases 5 and 6 of the Coupled Model Intercomparison Project (CMIP5 and CMIP6), significant differences were observed in the extratropical response to the IOD among the models, due to bias in the Rossby waveguide and IOD precipitation pattern. The LRTM was then applied to evaluate the extratropical response of the 850‐hPa temperature, wind anomalies, and sea‐ice concentration anomalies in observation data, as well as models that represented both the IOD precipitation and the extratropical waveguide adequately. The IOD induced cold southerly flow over the west of the Ross Sea, Weddell Sea, and Antarctic Peninsula, causing cold surface‐temperature anomalies and the increase of sea ice, and warm northerly flow over the east of the Ross Sea and Amundsen Sea, causing warm surface‐temperature anomalies and the decrease of sea ice. We recommend the LRTM as a complementary method to standard analysis of climate variability from observations and global climate models. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica Ross Sea Sea ice Weddell Sea Wiley Online Library Antarctic The Antarctic Antarctic Peninsula Weddell Sea Ross Sea Amundsen Sea Indian Weddell Quarterly Journal of the Royal Meteorological Society |
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Wiley Online Library |
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language |
English |
description |
Abstract Tropical–Antarctic teleconnections are known to have large impacts on Antarctic climate variability at multiple timescales. Anomalous tropical convection triggers upper‐level quasi‐stationary Rossby waves, which propagate to high southern latitudes and impact the local environment. Here the teleconnection between the Indian Ocean Dipole (IOD) and Antarctica was examined using daily gridded reanalysis data and the linear response theory method (LRTM) during September–November of 1980–2015. The individual contribution of the IOD over the Antarctic climate is challenging to quantify, as positive IOD events often co‐occur with El Niño events. However, using the LRTM, the extratropical response due to a positive IOD was successfully extracted from the combined signal in the composite map of anomalous 250‐hPa geopotential height. Applying the method to a set of models from phases 5 and 6 of the Coupled Model Intercomparison Project (CMIP5 and CMIP6), significant differences were observed in the extratropical response to the IOD among the models, due to bias in the Rossby waveguide and IOD precipitation pattern. The LRTM was then applied to evaluate the extratropical response of the 850‐hPa temperature, wind anomalies, and sea‐ice concentration anomalies in observation data, as well as models that represented both the IOD precipitation and the extratropical waveguide adequately. The IOD induced cold southerly flow over the west of the Ross Sea, Weddell Sea, and Antarctic Peninsula, causing cold surface‐temperature anomalies and the increase of sea ice, and warm northerly flow over the east of the Ross Sea and Amundsen Sea, causing warm surface‐temperature anomalies and the decrease of sea ice. We recommend the LRTM as a complementary method to standard analysis of climate variability from observations and global climate models. |
author2 |
Indian Institute of Technology Kharagpur |
format |
Article in Journal/Newspaper |
author |
Sen, Arnab Deb, Pranab Matthews, Adrian J. Joshi, Manoj M. |
spellingShingle |
Sen, Arnab Deb, Pranab Matthews, Adrian J. Joshi, Manoj M. Teleconnection and the Antarctic response to the Indian Ocean Dipole in CMIP5 and CMIP6 models |
author_facet |
Sen, Arnab Deb, Pranab Matthews, Adrian J. Joshi, Manoj M. |
author_sort |
Sen, Arnab |
title |
Teleconnection and the Antarctic response to the Indian Ocean Dipole in CMIP5 and CMIP6 models |
title_short |
Teleconnection and the Antarctic response to the Indian Ocean Dipole in CMIP5 and CMIP6 models |
title_full |
Teleconnection and the Antarctic response to the Indian Ocean Dipole in CMIP5 and CMIP6 models |
title_fullStr |
Teleconnection and the Antarctic response to the Indian Ocean Dipole in CMIP5 and CMIP6 models |
title_full_unstemmed |
Teleconnection and the Antarctic response to the Indian Ocean Dipole in CMIP5 and CMIP6 models |
title_sort |
teleconnection and the antarctic response to the indian ocean dipole in cmip5 and cmip6 models |
publisher |
Wiley |
publishDate |
2024 |
url |
http://dx.doi.org/10.1002/qj.4854 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.4854 |
geographic |
Antarctic The Antarctic Antarctic Peninsula Weddell Sea Ross Sea Amundsen Sea Indian Weddell |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Weddell Sea Ross Sea Amundsen Sea Indian Weddell |
genre |
Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica Ross Sea Sea ice Weddell Sea |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica Ross Sea Sea ice Weddell Sea |
op_source |
Quarterly Journal of the Royal Meteorological Society ISSN 0035-9009 1477-870X |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1002/qj.4854 |
container_title |
Quarterly Journal of the Royal Meteorological Society |
_version_ |
1811634374211272704 |