Summer upper‑level jets modulate the response of South American climate to ENSO
The upper-level jet stream is a critical element of atmospheric circulation, driving synoptic systems and extreme weather events. This study analyzes the impact of upper-level jets on South American (SA) summer temperature and precipitation under different El Niño-Southern Oscillation (ENSO) phases....
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Online Access: | https://hdl.handle.net/20.500.14352/88113 https://doi.org/10.1007/s00382-023-06955-9 https://link.springer.com/article/10.1007/s00382-023-06955-9 |
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ftunivcmadrid:oai:docta.ucm.es:20.500.14352/88113 2023-11-05T03:45:03+01:00 Summer upper‑level jets modulate the response of South American climate to ENSO Collazo Inglesini, Soledad Maribel García Herrera, Ricardo Francisco Barriopedro Cepero, David 2023-09-26 application/pdf https://hdl.handle.net/20.500.14352/88113 https://doi.org/10.1007/s00382-023-06955-9 https://link.springer.com/article/10.1007/s00382-023-06955-9 eng eng Springer doi:10.1007/s00382-023-06955-9 1432-0894 0930-7575 https://link.springer.com/article/10.1007/s00382-023-06955-9 http://dx.doi.org/10.1007/s00382-023-06955-9 https://hdl.handle.net/20.500.14352/88113 open access 551.5 Subtropical and polar front jet Multiparametric characterization Weather regimes Extreme temperatures El Niño-Southern Oscillation South American summer climate Meteorología (Física) 2501 Ciencias de la Atmósfera journal article VoR 2023 ftunivcmadrid https://doi.org/20.500.14352/8811310.1007/s00382-023-06955-9 2023-10-10T23:10:24Z The upper-level jet stream is a critical element of atmospheric circulation, driving synoptic systems and extreme weather events. This study analyzes the impact of upper-level jets on South American (SA) summer temperature and precipitation under different El Niño-Southern Oscillation (ENSO) phases. Using the ERA5 reanalysis dataset from 1979 to 2022, we perform a daily multiparametric characterization of the jet stream, considering its spatial and temporal discontinuities. Besides latitude and intensity, we find that the departure and number of branches of the subtropical jet (STJ) and the longitudinal extent of the Pacific branch of the polar front jet (PFJ) are needed for their description. An additional parameter is required to characterize the STJ due to its absence on around 40% of summer days over SA. Moreover, we observe distinct long-term changes in PFJ parameters across different ocean basins. Three synoptic weather types (WTs) of the upper-level zonal wind are identified: normal conditions, a prominent STJ pattern, and a PFJ-only pattern. The latter pattern is associated with anticyclonic anomalies at 500hPa in the South Atlantic Ocean and an active SA Convergence Zone, which favors clear skies and warm (wet and cold) conditions in southern SA (Brazil). Consistently, the probability of experiencing warm spells in central Argentina is increased more than twofold. Finally, we detect that the temperature anomalies associated with the WTs are independent of the ENSO phase. However, ENSO modulates the frequency of the WTs: during La Niña (El Niño), the PFJ-only (prominent STJ) pattern is more common. Depto. de Física de la Tierra y Astrofísica Fac. de Ciencias Físicas TRUE Unión Europea. H2020 pub Article in Journal/Newspaper South Atlantic Ocean Universidad Complutense de Madrid (UCM): E-Prints Complutense Climate Dynamics |
institution |
Open Polar |
collection |
Universidad Complutense de Madrid (UCM): E-Prints Complutense |
op_collection_id |
ftunivcmadrid |
language |
English |
topic |
551.5 Subtropical and polar front jet Multiparametric characterization Weather regimes Extreme temperatures El Niño-Southern Oscillation South American summer climate Meteorología (Física) 2501 Ciencias de la Atmósfera |
spellingShingle |
551.5 Subtropical and polar front jet Multiparametric characterization Weather regimes Extreme temperatures El Niño-Southern Oscillation South American summer climate Meteorología (Física) 2501 Ciencias de la Atmósfera Collazo Inglesini, Soledad Maribel García Herrera, Ricardo Francisco Barriopedro Cepero, David Summer upper‑level jets modulate the response of South American climate to ENSO |
topic_facet |
551.5 Subtropical and polar front jet Multiparametric characterization Weather regimes Extreme temperatures El Niño-Southern Oscillation South American summer climate Meteorología (Física) 2501 Ciencias de la Atmósfera |
description |
The upper-level jet stream is a critical element of atmospheric circulation, driving synoptic systems and extreme weather events. This study analyzes the impact of upper-level jets on South American (SA) summer temperature and precipitation under different El Niño-Southern Oscillation (ENSO) phases. Using the ERA5 reanalysis dataset from 1979 to 2022, we perform a daily multiparametric characterization of the jet stream, considering its spatial and temporal discontinuities. Besides latitude and intensity, we find that the departure and number of branches of the subtropical jet (STJ) and the longitudinal extent of the Pacific branch of the polar front jet (PFJ) are needed for their description. An additional parameter is required to characterize the STJ due to its absence on around 40% of summer days over SA. Moreover, we observe distinct long-term changes in PFJ parameters across different ocean basins. Three synoptic weather types (WTs) of the upper-level zonal wind are identified: normal conditions, a prominent STJ pattern, and a PFJ-only pattern. The latter pattern is associated with anticyclonic anomalies at 500hPa in the South Atlantic Ocean and an active SA Convergence Zone, which favors clear skies and warm (wet and cold) conditions in southern SA (Brazil). Consistently, the probability of experiencing warm spells in central Argentina is increased more than twofold. Finally, we detect that the temperature anomalies associated with the WTs are independent of the ENSO phase. However, ENSO modulates the frequency of the WTs: during La Niña (El Niño), the PFJ-only (prominent STJ) pattern is more common. Depto. de Física de la Tierra y Astrofísica Fac. de Ciencias Físicas TRUE Unión Europea. H2020 pub |
format |
Article in Journal/Newspaper |
author |
Collazo Inglesini, Soledad Maribel García Herrera, Ricardo Francisco Barriopedro Cepero, David |
author_facet |
Collazo Inglesini, Soledad Maribel García Herrera, Ricardo Francisco Barriopedro Cepero, David |
author_sort |
Collazo Inglesini, Soledad Maribel |
title |
Summer upper‑level jets modulate the response of South American climate to ENSO |
title_short |
Summer upper‑level jets modulate the response of South American climate to ENSO |
title_full |
Summer upper‑level jets modulate the response of South American climate to ENSO |
title_fullStr |
Summer upper‑level jets modulate the response of South American climate to ENSO |
title_full_unstemmed |
Summer upper‑level jets modulate the response of South American climate to ENSO |
title_sort |
summer upper‑level jets modulate the response of south american climate to enso |
publisher |
Springer |
publishDate |
2023 |
url |
https://hdl.handle.net/20.500.14352/88113 https://doi.org/10.1007/s00382-023-06955-9 https://link.springer.com/article/10.1007/s00382-023-06955-9 |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_relation |
doi:10.1007/s00382-023-06955-9 1432-0894 0930-7575 https://link.springer.com/article/10.1007/s00382-023-06955-9 http://dx.doi.org/10.1007/s00382-023-06955-9 https://hdl.handle.net/20.500.14352/88113 |
op_rights |
open access |
op_doi |
https://doi.org/20.500.14352/8811310.1007/s00382-023-06955-9 |
container_title |
Climate Dynamics |
_version_ |
1781706369203699712 |