The Southern Hemisphere Blocking Index in the ERA5 and the NCEP/NCAR Datasets: A Comparative Climatology for the Period 1940–2022

Blocking anticyclones are important atmospheric phenomena generally associated with extreme weather (e.g., droughts and cold air surges). Blockings also constitute largescale indicators of climate change. The study of blockings in the Southern Hemisphere (SH) has been traditionally carried out uti...

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Autores principales: Yuchechen, Adrian E., Lakkis, Susan Gabriela, Canziani, Pablo O.
Formato: Libro
Lenguaje:Inglés
Publicado: MDPI 2025
Materias:
500 hPa
CLIMATOLOGIA
HEMISFERIO SUR
ERA5
NCEP/NCAR
Acceso en línea:https://repositorio.uca.edu.ar/handle/123456789/19956
https://doi.org/10.3390/atmos16060719
Aporte de:
Repositorio Institucional de la Universidad Católica Argentina (UCA) de Universidad Católica Argentina
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spelling I33-R139-123456789-199562025-06-24T11:25:33Z The Southern Hemisphere Blocking Index in the ERA5 and the NCEP/NCAR Datasets: A Comparative Climatology for the Period 1940–2022 Yuchechen, Adrian E. Lakkis, Susan Gabriela Canziani, Pablo O. 500 hPa CLIMATOLOGIA HEMISFERIO SUR ERA5 NCEP/NCAR Blocking anticyclones are important atmospheric phenomena generally associated with extreme weather (e.g., droughts and cold air surges). Blockings also constitute largescale indicators of climate change. The study of blockings in the Southern Hemisphere (SH) has been traditionally carried out utilizing reanalysis products. This paper is aimed at presenting an updated, comprehensive climatology of blockings in the SH as extracted from the ERA5 and the NCEP/NCAR reanalysis datasets in the 1940–2022 and 1948–2022 periods, respectively. Blockings were located by means of a unidimensional index at 500 hPa. The results were stratified by season, longitude, region, persistence, and intensity, and the climatology from both datasets was compared. The primary location of blockings was close to the Date Line in every season. Additionally, depending on the season, up to fourth-rank maxima could be located. Generally, the secondary maxima were found in the south Atlantic; lower-order maxima were located in the south-eastern Pacific, west of South America, and in the south-western Indian Ocean east of South Africa. The most intense blockings were concentrated in the Pacific and in the south Atlantic in both datasets, and they were also located in the Indian Ocean, but in the ERA5 reanalysis only. The longest-lived blockings occurred in the south Pacific and in the south Atlantic during southern winter. 2025-06-23T16:56:23Z 2025-06-23T16:56:23Z 2025 Libro 2073-4433 https://repositorio.uca.edu.ar/handle/123456789/19956 https://doi.org/10.3390/atmos16060719 eng Recuperación de datos climáticos históricos en Argentina Atribución 4.0 Internacional http://creativecommons.org/licenses/by/4.0/ application/pdf MDPI Atmosphere 2025, 16(6): 719
institution Universidad Católica Argentina
institution_str I-33
repository_str R-139
collection Repositorio Institucional de la Universidad Católica Argentina (UCA)
language Inglés
topic 500 hPa
CLIMATOLOGIA
HEMISFERIO SUR
ERA5
NCEP/NCAR
spellingShingle 500 hPa
CLIMATOLOGIA
HEMISFERIO SUR
ERA5
NCEP/NCAR
Yuchechen, Adrian E.
Lakkis, Susan Gabriela
Canziani, Pablo O.
The Southern Hemisphere Blocking Index in the ERA5 and the NCEP/NCAR Datasets: A Comparative Climatology for the Period 1940–2022
topic_facet 500 hPa
CLIMATOLOGIA
HEMISFERIO SUR
ERA5
NCEP/NCAR
description Blocking anticyclones are important atmospheric phenomena generally associated with extreme weather (e.g., droughts and cold air surges). Blockings also constitute largescale indicators of climate change. The study of blockings in the Southern Hemisphere (SH) has been traditionally carried out utilizing reanalysis products. This paper is aimed at presenting an updated, comprehensive climatology of blockings in the SH as extracted from the ERA5 and the NCEP/NCAR reanalysis datasets in the 1940–2022 and 1948–2022 periods, respectively. Blockings were located by means of a unidimensional index at 500 hPa. The results were stratified by season, longitude, region, persistence, and intensity, and the climatology from both datasets was compared. The primary location of blockings was close to the Date Line in every season. Additionally, depending on the season, up to fourth-rank maxima could be located. Generally, the secondary maxima were found in the south Atlantic; lower-order maxima were located in the south-eastern Pacific, west of South America, and in the south-western Indian Ocean east of South Africa. The most intense blockings were concentrated in the Pacific and in the south Atlantic in both datasets, and they were also located in the Indian Ocean, but in the ERA5 reanalysis only. The longest-lived blockings occurred in the south Pacific and in the south Atlantic during southern winter.
format Libro
author Yuchechen, Adrian E.
Lakkis, Susan Gabriela
Canziani, Pablo O.
author_facet Yuchechen, Adrian E.
Lakkis, Susan Gabriela
Canziani, Pablo O.
author_sort Yuchechen, Adrian E.
title The Southern Hemisphere Blocking Index in the ERA5 and the NCEP/NCAR Datasets: A Comparative Climatology for the Period 1940–2022
title_short The Southern Hemisphere Blocking Index in the ERA5 and the NCEP/NCAR Datasets: A Comparative Climatology for the Period 1940–2022
title_full The Southern Hemisphere Blocking Index in the ERA5 and the NCEP/NCAR Datasets: A Comparative Climatology for the Period 1940–2022
title_fullStr The Southern Hemisphere Blocking Index in the ERA5 and the NCEP/NCAR Datasets: A Comparative Climatology for the Period 1940–2022
title_full_unstemmed The Southern Hemisphere Blocking Index in the ERA5 and the NCEP/NCAR Datasets: A Comparative Climatology for the Period 1940–2022
title_sort southern hemisphere blocking index in the era5 and the ncep/ncar datasets: a comparative climatology for the period 1940–2022
publisher MDPI
publishDate 2025
url https://repositorio.uca.edu.ar/handle/123456789/19956
https://doi.org/10.3390/atmos16060719
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