A New Combined Detection Algorithm for Blocking and Subtropical Ridges

Blocks are high-impact atmospheric systems of the mid-/high latitudes and have been widely addressed in meteorological and climatological studies. However, the diversity of blocking definitions makes comparison across studies not straightforward. Here, we propose a conceptual model for the life cycl...

Descripción completa

Detalles Bibliográficos
Autores: Sousa, Pedro M., Barriopedro Cepero, David, García Herrera, Ricardo Francisco, Woollings, Tim, Trigo, Ricardo M.
Tipo de recurso: artículo
Fecha de publicación:2021
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/4951
Acceso en línea:https://hdl.handle.net/20.500.14352/4951
Access Level:acceso abierto
Palabra clave:52
Southern annular mode
Rossby-wave breaking
Atmospheric blocking
Hemisphere
Climate
Variability
Trends
Impact
Amplification
Circulation
Astrofísica
id ES_8e44d2f06f8a0cf192a69d2a8c397a21
oai_identifier_str oai:docta.ucm.es:20.500.14352/4951
network_acronym_str ES
network_name_str España
repository_id_str
spelling A New Combined Detection Algorithm for Blocking and Subtropical RidgesSousa, Pedro M.Barriopedro Cepero, DavidGarcía Herrera, Ricardo FranciscoWoollings, TimTrigo, Ricardo M.52Southern annular modeRossby-wave breakingAtmospheric blockingHemisphereClimateVariabilityTrendsImpactAmplificationCirculationAstrofísicaBlocks are high-impact atmospheric systems of the mid-/high latitudes and have been widely addressed in meteorological and climatological studies. However, the diversity of blocking definitions makes comparison across studies not straightforward. Here, we propose a conceptual model for the life cycle of high pressure systems that recognizes the multifaceted and transient characteristics of these events. A detection scheme identifies and classifies daily structures, discriminating between subtropical ridges and different types of well-established blocking patterns (omega and dipole-like Rex). This is complemented by a spatiotemporal tracking algorithm, which accounts for transitions between patterns, providing a global catalog of events for 1950-2020. Criteria rely on simple metrics retrieved from one single-level field, and allow implementation in different datasets and climatic realms. Using reanalysis data, we provide illustrative examples, the first global and seasonal climatological assessment of the diversity of high pressure events, their associated impacts, and recent frequency changes. Results reveal that ridge and blocking events affect widespread regions from the subtropics to high latitudes. We find remarkably distinct regional impacts among the considered types, which had been hindered in previous studies by restricted focus on Rex-like structures. This plethora of high pressure systems is much less evident in the Southern Hemisphere, where activity is dominated by subtropical ridges and secluded blocking-like patterns. We report increasing frequencies of low-latitude systems, although with hemispheric and seasonal differences that can only be partially interpreted as a consequence of subtropical expansion. Blocking frequency trends exhibit more heterogeneous and complex spatial patterns, with no evidence of generalized significant changes.American Meteorological SocietyUniversidad Complutense de Madrid20212021-09-0120212021-09-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/4951reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/49512026-06-02T12:44:21Z
dc.title.none.fl_str_mv A New Combined Detection Algorithm for Blocking and Subtropical Ridges
title A New Combined Detection Algorithm for Blocking and Subtropical Ridges
spellingShingle A New Combined Detection Algorithm for Blocking and Subtropical Ridges
Sousa, Pedro M.
52
Southern annular mode
Rossby-wave breaking
Atmospheric blocking
Hemisphere
Climate
Variability
Trends
Impact
Amplification
Circulation
Astrofísica
title_short A New Combined Detection Algorithm for Blocking and Subtropical Ridges
title_full A New Combined Detection Algorithm for Blocking and Subtropical Ridges
title_fullStr A New Combined Detection Algorithm for Blocking and Subtropical Ridges
title_full_unstemmed A New Combined Detection Algorithm for Blocking and Subtropical Ridges
title_sort A New Combined Detection Algorithm for Blocking and Subtropical Ridges
dc.creator.none.fl_str_mv Sousa, Pedro M.
Barriopedro Cepero, David
García Herrera, Ricardo Francisco
Woollings, Tim
Trigo, Ricardo M.
author Sousa, Pedro M.
author_facet Sousa, Pedro M.
Barriopedro Cepero, David
García Herrera, Ricardo Francisco
Woollings, Tim
Trigo, Ricardo M.
author_role author
author2 Barriopedro Cepero, David
García Herrera, Ricardo Francisco
Woollings, Tim
Trigo, Ricardo M.
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 52
Southern annular mode
Rossby-wave breaking
Atmospheric blocking
Hemisphere
Climate
Variability
Trends
Impact
Amplification
Circulation
Astrofísica
topic 52
Southern annular mode
Rossby-wave breaking
Atmospheric blocking
Hemisphere
Climate
Variability
Trends
Impact
Amplification
Circulation
Astrofísica
description Blocks are high-impact atmospheric systems of the mid-/high latitudes and have been widely addressed in meteorological and climatological studies. However, the diversity of blocking definitions makes comparison across studies not straightforward. Here, we propose a conceptual model for the life cycle of high pressure systems that recognizes the multifaceted and transient characteristics of these events. A detection scheme identifies and classifies daily structures, discriminating between subtropical ridges and different types of well-established blocking patterns (omega and dipole-like Rex). This is complemented by a spatiotemporal tracking algorithm, which accounts for transitions between patterns, providing a global catalog of events for 1950-2020. Criteria rely on simple metrics retrieved from one single-level field, and allow implementation in different datasets and climatic realms. Using reanalysis data, we provide illustrative examples, the first global and seasonal climatological assessment of the diversity of high pressure events, their associated impacts, and recent frequency changes. Results reveal that ridge and blocking events affect widespread regions from the subtropics to high latitudes. We find remarkably distinct regional impacts among the considered types, which had been hindered in previous studies by restricted focus on Rex-like structures. This plethora of high pressure systems is much less evident in the Southern Hemisphere, where activity is dominated by subtropical ridges and secluded blocking-like patterns. We report increasing frequencies of low-latitude systems, although with hemispheric and seasonal differences that can only be partially interpreted as a consequence of subtropical expansion. Blocking frequency trends exhibit more heterogeneous and complex spatial patterns, with no evidence of generalized significant changes.
publishDate 2021
dc.date.none.fl_str_mv 2021
2021-09-01
2021
2021-09-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/4951
url https://hdl.handle.net/20.500.14352/4951
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Meteorological Society
publisher.none.fl_str_mv American Meteorological Society
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869413115176681472
score 15,300724

Similares en LA Referencia