Simulation of Northern Winter Stratospheric Polar Vortex Regimes in CESM2-WACCM
The possible impact of various Arctic polar vortex regimes for the stratosphere on the Northern Hemisphere extratropics has not been fully understood. Previous study has classified the stratospheric Arctic vortex to six regimes using the k-mean clustering algorithm based on the ERA5 reanalysis. The...
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ftdoajarticles:oai:doaj.org/article:2bbb538483c848439568bd0027c881e0 2023-05-15T14:55:49+02:00 Simulation of Northern Winter Stratospheric Polar Vortex Regimes in CESM2-WACCM Dong Guo Zhuoqi Liang Qiang Gui Qian Lu Qiong Zheng Shuyang Yu 2023-01-01T00:00:00Z https://doi.org/10.3390/atmos14020243 https://doaj.org/article/2bbb538483c848439568bd0027c881e0 EN eng MDPI AG https://www.mdpi.com/2073-4433/14/2/243 https://doaj.org/toc/2073-4433 doi:10.3390/atmos14020243 2073-4433 https://doaj.org/article/2bbb538483c848439568bd0027c881e0 Atmosphere, Vol 14, Iss 243, p 243 (2023) stratospheric polar vortex regimes CESM2-WACCM eddy heat flux Meteorology. Climatology QC851-999 article 2023 ftdoajarticles https://doi.org/10.3390/atmos14020243 2023-02-26T01:31:23Z The possible impact of various Arctic polar vortex regimes for the stratosphere on the Northern Hemisphere extratropics has not been fully understood. Previous study has classified the stratospheric Arctic vortex to six regimes using the k-mean clustering algorithm based on the ERA5 reanalysis. The stability and robustness of the classification is further verified with a much longer model dataset and historical integrations from CESM2-WACCM. Consistent with the reanalysis, we clustered the Arctic stratospheric polar vortex forms into six patterns, named as homogeneously-intensified and -weakened regimes (HI, HW), North America-intensified and -weakened regimes (NAI, HAW), and Eurasia-intensified and -weakened regimes (EUI, EUW). A zonally uniform positive (negative) Northern Annular Mode (NAM) pattern develops during the HI (HW) regime from the stratosphere to troposphere. The NAM-like pattern shifts toward the western hemisphere with the largest negative (positive) anomalous height center shifting to North America during the NAI (NAW) regime. In contrast, the maximum polar anomaly center moves towards polar Eurasia during the EUI (EUW) regime. The HI, NAI, and EUW regimes are accompanied with weakened wave activities, while the HW, NAW, and EUI regimes are preceded by enhanced planetary waves. Accordingly, persistent anomalies of warmth (coldness) exist over midlatitude Eurasia and North America during the HI (HW). Anomalous warmth (coldness) centers exist in northern Eurasia, while anomalous coldness (warmth) centers exist around the Mediterranean Sea during the NAI (NAW) regime. Anomalous warmth (coldness) centers develop in East Asia in the EUI (EUW) periods. The rainfall anomaly distributions also vary with the stratospheric polar vortex regime. The frequency for stratospheric regimes during SSWs and strong vortex events is also assessed and consistent with previous findings. Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Atmosphere 14 2 243 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
stratospheric polar vortex regimes CESM2-WACCM eddy heat flux Meteorology. Climatology QC851-999 |
spellingShingle |
stratospheric polar vortex regimes CESM2-WACCM eddy heat flux Meteorology. Climatology QC851-999 Dong Guo Zhuoqi Liang Qiang Gui Qian Lu Qiong Zheng Shuyang Yu Simulation of Northern Winter Stratospheric Polar Vortex Regimes in CESM2-WACCM |
topic_facet |
stratospheric polar vortex regimes CESM2-WACCM eddy heat flux Meteorology. Climatology QC851-999 |
description |
The possible impact of various Arctic polar vortex regimes for the stratosphere on the Northern Hemisphere extratropics has not been fully understood. Previous study has classified the stratospheric Arctic vortex to six regimes using the k-mean clustering algorithm based on the ERA5 reanalysis. The stability and robustness of the classification is further verified with a much longer model dataset and historical integrations from CESM2-WACCM. Consistent with the reanalysis, we clustered the Arctic stratospheric polar vortex forms into six patterns, named as homogeneously-intensified and -weakened regimes (HI, HW), North America-intensified and -weakened regimes (NAI, HAW), and Eurasia-intensified and -weakened regimes (EUI, EUW). A zonally uniform positive (negative) Northern Annular Mode (NAM) pattern develops during the HI (HW) regime from the stratosphere to troposphere. The NAM-like pattern shifts toward the western hemisphere with the largest negative (positive) anomalous height center shifting to North America during the NAI (NAW) regime. In contrast, the maximum polar anomaly center moves towards polar Eurasia during the EUI (EUW) regime. The HI, NAI, and EUW regimes are accompanied with weakened wave activities, while the HW, NAW, and EUI regimes are preceded by enhanced planetary waves. Accordingly, persistent anomalies of warmth (coldness) exist over midlatitude Eurasia and North America during the HI (HW). Anomalous warmth (coldness) centers exist in northern Eurasia, while anomalous coldness (warmth) centers exist around the Mediterranean Sea during the NAI (NAW) regime. Anomalous warmth (coldness) centers develop in East Asia in the EUI (EUW) periods. The rainfall anomaly distributions also vary with the stratospheric polar vortex regime. The frequency for stratospheric regimes during SSWs and strong vortex events is also assessed and consistent with previous findings. |
format |
Article in Journal/Newspaper |
author |
Dong Guo Zhuoqi Liang Qiang Gui Qian Lu Qiong Zheng Shuyang Yu |
author_facet |
Dong Guo Zhuoqi Liang Qiang Gui Qian Lu Qiong Zheng Shuyang Yu |
author_sort |
Dong Guo |
title |
Simulation of Northern Winter Stratospheric Polar Vortex Regimes in CESM2-WACCM |
title_short |
Simulation of Northern Winter Stratospheric Polar Vortex Regimes in CESM2-WACCM |
title_full |
Simulation of Northern Winter Stratospheric Polar Vortex Regimes in CESM2-WACCM |
title_fullStr |
Simulation of Northern Winter Stratospheric Polar Vortex Regimes in CESM2-WACCM |
title_full_unstemmed |
Simulation of Northern Winter Stratospheric Polar Vortex Regimes in CESM2-WACCM |
title_sort |
simulation of northern winter stratospheric polar vortex regimes in cesm2-waccm |
publisher |
MDPI AG |
publishDate |
2023 |
url |
https://doi.org/10.3390/atmos14020243 https://doaj.org/article/2bbb538483c848439568bd0027c881e0 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Atmosphere, Vol 14, Iss 243, p 243 (2023) |
op_relation |
https://www.mdpi.com/2073-4433/14/2/243 https://doaj.org/toc/2073-4433 doi:10.3390/atmos14020243 2073-4433 https://doaj.org/article/2bbb538483c848439568bd0027c881e0 |
op_doi |
https://doi.org/10.3390/atmos14020243 |
container_title |
Atmosphere |
container_volume |
14 |
container_issue |
2 |
container_start_page |
243 |
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1766327827985072128 |