Teleconnections link to summer heat extremes in the south-central U.S.: Insights from CMIP5 and CMIP6 simulations
This study examines the relationship between teleconnections, which represent quasiperiodic modes of large-scale atmospheric and oceanic variability, and extreme heatwaves in the south-central (SC) U.S. region, aiming to understand multiyear variability in the heat extremes. Observational data and m...
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ftdoajarticles:oai:doaj.org/article:6f8742fdb7734255a2c665d95a6e4f20 2024-01-21T10:06:42+01:00 Teleconnections link to summer heat extremes in the south-central U.S.: Insights from CMIP5 and CMIP6 simulations Jung-Hee Ryu Song-Lak Kang 2023-12-01T00:00:00Z https://doi.org/10.1016/j.wace.2023.100635 https://doaj.org/article/6f8742fdb7734255a2c665d95a6e4f20 EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S2212094723000889 https://doaj.org/toc/2212-0947 2212-0947 doi:10.1016/j.wace.2023.100635 https://doaj.org/article/6f8742fdb7734255a2c665d95a6e4f20 Weather and Climate Extremes, Vol 42, Iss , Pp 100635- (2023) Extreme heatwaves South-central U.S. region Teleconnection patterns CMIP6 models Pacific/North America Wave-activity flux Meteorology. Climatology QC851-999 article 2023 ftdoajarticles https://doi.org/10.1016/j.wace.2023.100635 2023-12-24T01:42:35Z This study examines the relationship between teleconnections, which represent quasiperiodic modes of large-scale atmospheric and oceanic variability, and extreme heatwaves in the south-central (SC) U.S. region, aiming to understand multiyear variability in the heat extremes. Observational data and model simulations reveal that soil water has a stronger influence on surface air temperature in the SC region than individual teleconnections, though not as strong as their combined influence. Particularly, the Pacific North America (PNA), North Atlantic Oscillation (NAO), and Pacific Decadal Oscillation (PDO) teleconnections have a substantial impact on surface air temperature in the region through anomalous anticyclonic circulation, during their negative phases. The wave-activity flux analysis shows that the wave train associated with the PNA teleconnection originates from the extratropical North Pacific Ocean, likely influenced by sea surface temperature (SST) forcing. Similarly, the wave packet linked to the PDO pattern originates from the central Pacific Ocean in the middle latitudes. In contrast, the wave train related to the NAO pattern exhibits little connection to SST forcing, originating from Greenland and propagating across Europe, Russia, the North Pacific, and North America. While climate models generally capture the PNA and PDO wave trains, they struggle to accurately simulate the NAO wave train across the North Pacific Ocean towards North America. This indicates the current generation of climate models face challenges in representing the complex dynamics underlying the NAO wave train. Article in Journal/Newspaper Greenland North Atlantic North Atlantic oscillation Directory of Open Access Journals: DOAJ Articles Greenland Pacific Weather and Climate Extremes 42 100635 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Extreme heatwaves South-central U.S. region Teleconnection patterns CMIP6 models Pacific/North America Wave-activity flux Meteorology. Climatology QC851-999 |
spellingShingle |
Extreme heatwaves South-central U.S. region Teleconnection patterns CMIP6 models Pacific/North America Wave-activity flux Meteorology. Climatology QC851-999 Jung-Hee Ryu Song-Lak Kang Teleconnections link to summer heat extremes in the south-central U.S.: Insights from CMIP5 and CMIP6 simulations |
topic_facet |
Extreme heatwaves South-central U.S. region Teleconnection patterns CMIP6 models Pacific/North America Wave-activity flux Meteorology. Climatology QC851-999 |
description |
This study examines the relationship between teleconnections, which represent quasiperiodic modes of large-scale atmospheric and oceanic variability, and extreme heatwaves in the south-central (SC) U.S. region, aiming to understand multiyear variability in the heat extremes. Observational data and model simulations reveal that soil water has a stronger influence on surface air temperature in the SC region than individual teleconnections, though not as strong as their combined influence. Particularly, the Pacific North America (PNA), North Atlantic Oscillation (NAO), and Pacific Decadal Oscillation (PDO) teleconnections have a substantial impact on surface air temperature in the region through anomalous anticyclonic circulation, during their negative phases. The wave-activity flux analysis shows that the wave train associated with the PNA teleconnection originates from the extratropical North Pacific Ocean, likely influenced by sea surface temperature (SST) forcing. Similarly, the wave packet linked to the PDO pattern originates from the central Pacific Ocean in the middle latitudes. In contrast, the wave train related to the NAO pattern exhibits little connection to SST forcing, originating from Greenland and propagating across Europe, Russia, the North Pacific, and North America. While climate models generally capture the PNA and PDO wave trains, they struggle to accurately simulate the NAO wave train across the North Pacific Ocean towards North America. This indicates the current generation of climate models face challenges in representing the complex dynamics underlying the NAO wave train. |
format |
Article in Journal/Newspaper |
author |
Jung-Hee Ryu Song-Lak Kang |
author_facet |
Jung-Hee Ryu Song-Lak Kang |
author_sort |
Jung-Hee Ryu |
title |
Teleconnections link to summer heat extremes in the south-central U.S.: Insights from CMIP5 and CMIP6 simulations |
title_short |
Teleconnections link to summer heat extremes in the south-central U.S.: Insights from CMIP5 and CMIP6 simulations |
title_full |
Teleconnections link to summer heat extremes in the south-central U.S.: Insights from CMIP5 and CMIP6 simulations |
title_fullStr |
Teleconnections link to summer heat extremes in the south-central U.S.: Insights from CMIP5 and CMIP6 simulations |
title_full_unstemmed |
Teleconnections link to summer heat extremes in the south-central U.S.: Insights from CMIP5 and CMIP6 simulations |
title_sort |
teleconnections link to summer heat extremes in the south-central u.s.: insights from cmip5 and cmip6 simulations |
publisher |
Elsevier |
publishDate |
2023 |
url |
https://doi.org/10.1016/j.wace.2023.100635 https://doaj.org/article/6f8742fdb7734255a2c665d95a6e4f20 |
geographic |
Greenland Pacific |
geographic_facet |
Greenland Pacific |
genre |
Greenland North Atlantic North Atlantic oscillation |
genre_facet |
Greenland North Atlantic North Atlantic oscillation |
op_source |
Weather and Climate Extremes, Vol 42, Iss , Pp 100635- (2023) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S2212094723000889 https://doaj.org/toc/2212-0947 2212-0947 doi:10.1016/j.wace.2023.100635 https://doaj.org/article/6f8742fdb7734255a2c665d95a6e4f20 |
op_doi |
https://doi.org/10.1016/j.wace.2023.100635 |
container_title |
Weather and Climate Extremes |
container_volume |
42 |
container_start_page |
100635 |
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1788697185958756352 |