Linking warm Arctic winters, Rossby waves and Cold Spells: an idealized numerical study
International audience Abstract The changes of midlatitude Rossby waves and cold extreme temperature events (cold spells) during warm Arctic winters are analysed using a dry three-level quasi-geostrophic model on the sphere. Two long-term simulations are compared: the first run has the observed wint...
Published in: | Journal of the Atmospheric Sciences |
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Online Access: | https://hal.archives-ouvertes.fr/hal-03339737 https://doi.org/10.1175/JAS-D-20-0088.1 |
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ftccsdartic:oai:HAL:hal-03339737v1 2023-05-15T14:50:26+02:00 Linking warm Arctic winters, Rossby waves and Cold Spells: an idealized numerical study Jolly, Emilien D’Andrea, Fabio Rivière, Gwendal Fromang, Sebastien Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Modélisation du climat (CLIM) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) 2021-06-14 https://hal.archives-ouvertes.fr/hal-03339737 https://doi.org/10.1175/JAS-D-20-0088.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/JAS-D-20-0088.1 hal-03339737 https://hal.archives-ouvertes.fr/hal-03339737 doi:10.1175/JAS-D-20-0088.1 ISSN: 0022-4928 EISSN: 1520-0469 Journal of the Atmospheric Sciences https://hal.archives-ouvertes.fr/hal-03339737 Journal of the Atmospheric Sciences, American Meteorological Society, 2021, ⟨10.1175/JAS-D-20-0088.1⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 2021 ftccsdartic https://doi.org/10.1175/JAS-D-20-0088.1 2021-11-20T23:49:12Z International audience Abstract The changes of midlatitude Rossby waves and cold extreme temperature events (cold spells) during warm Arctic winters are analysed using a dry three-level quasi-geostrophic model on the sphere. Two long-term simulations are compared: the first run has the observed wintertime climatology, while the second run includes the composite of the global anomalies associated with the six hottest Arctic winters. A spectral analysis shows a large increase in wave amplitude for near-zero and westward phase speeds and a more moderate decrease for high eastward phase speeds. The increase in low-frequency variability (periods greater than a week) associated with the power shift to slower waves is largely responsible for an increase in mid-latitude long-lasting cold spells. In mid-latitude regions, in presence of a mean warming, that increase in low-frequency variance compensates the increase of the mean temperature, resulting at places in a frequency of cold spells that remains by and large unaltered. In presence of mean cooling, both the increase in variance and the decrease in the mean temperature participate in an increased frequency of cold spells. Sensitivity experiments show that the power shift to slower waves is mainly due to the tropical anomalies that developed during those particular winters and less importantly to changes in the background flow at higher latitudes associated with the Arctic Amplification pattern. Article in Journal/Newspaper Arctic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Journal of the Atmospheric Sciences |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Jolly, Emilien D’Andrea, Fabio Rivière, Gwendal Fromang, Sebastien Linking warm Arctic winters, Rossby waves and Cold Spells: an idealized numerical study |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience Abstract The changes of midlatitude Rossby waves and cold extreme temperature events (cold spells) during warm Arctic winters are analysed using a dry three-level quasi-geostrophic model on the sphere. Two long-term simulations are compared: the first run has the observed wintertime climatology, while the second run includes the composite of the global anomalies associated with the six hottest Arctic winters. A spectral analysis shows a large increase in wave amplitude for near-zero and westward phase speeds and a more moderate decrease for high eastward phase speeds. The increase in low-frequency variability (periods greater than a week) associated with the power shift to slower waves is largely responsible for an increase in mid-latitude long-lasting cold spells. In mid-latitude regions, in presence of a mean warming, that increase in low-frequency variance compensates the increase of the mean temperature, resulting at places in a frequency of cold spells that remains by and large unaltered. In presence of mean cooling, both the increase in variance and the decrease in the mean temperature participate in an increased frequency of cold spells. Sensitivity experiments show that the power shift to slower waves is mainly due to the tropical anomalies that developed during those particular winters and less importantly to changes in the background flow at higher latitudes associated with the Arctic Amplification pattern. |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Modélisation du climat (CLIM) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) |
format |
Article in Journal/Newspaper |
author |
Jolly, Emilien D’Andrea, Fabio Rivière, Gwendal Fromang, Sebastien |
author_facet |
Jolly, Emilien D’Andrea, Fabio Rivière, Gwendal Fromang, Sebastien |
author_sort |
Jolly, Emilien |
title |
Linking warm Arctic winters, Rossby waves and Cold Spells: an idealized numerical study |
title_short |
Linking warm Arctic winters, Rossby waves and Cold Spells: an idealized numerical study |
title_full |
Linking warm Arctic winters, Rossby waves and Cold Spells: an idealized numerical study |
title_fullStr |
Linking warm Arctic winters, Rossby waves and Cold Spells: an idealized numerical study |
title_full_unstemmed |
Linking warm Arctic winters, Rossby waves and Cold Spells: an idealized numerical study |
title_sort |
linking warm arctic winters, rossby waves and cold spells: an idealized numerical study |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.archives-ouvertes.fr/hal-03339737 https://doi.org/10.1175/JAS-D-20-0088.1 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
ISSN: 0022-4928 EISSN: 1520-0469 Journal of the Atmospheric Sciences https://hal.archives-ouvertes.fr/hal-03339737 Journal of the Atmospheric Sciences, American Meteorological Society, 2021, ⟨10.1175/JAS-D-20-0088.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/JAS-D-20-0088.1 hal-03339737 https://hal.archives-ouvertes.fr/hal-03339737 doi:10.1175/JAS-D-20-0088.1 |
op_doi |
https://doi.org/10.1175/JAS-D-20-0088.1 |
container_title |
Journal of the Atmospheric Sciences |
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1766321458020089856 |