Evidence of nonlinear Walker circulation feedbacks on extreme El Nino Pacific diversity: Observations and CMIP5 models

Descripción del Articulo

The work was performed using computational resources, that is, the HPC-Linux-Cluster, at the Laboratorio de Dinamica de Fluidos Geofisicos Computacionales (http://scah.igp.gob.pe/laboratorios/dfgc) at Instituto Geofisico del Peru (grants 101-2014-FONDECYT).
Detalles Bibliográficos
Autor: Sulca, Juan
Formato: artículo
Fecha de Publicación:2021
Institución:Consejo Nacional de Ciencia Tecnología e Innovación
Repositorio:CONCYTEC-Institucional
Lenguaje:inglés
OAI Identifier:oai:repositorio.concytec.gob.pe:20.500.12390/2931
Enlace del recurso:https://hdl.handle.net/20.500.12390/2931
https://doi.org/10.1002/joc.6998
Nivel de acceso:acceso abierto
Materia:Walker circulation
central and eastern El Nino
CMIP5 models
nonlinear Bjerknes feedback
positive stratification anomaly
shallow CISK mechanism
https://purl.org/pe-repo/ocde/ford#5.08.04
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oai_identifier_str oai:repositorio.concytec.gob.pe:20.500.12390/2931
network_acronym_str CONC
network_name_str CONCYTEC-Institucional
repository_id_str 4689
dc.title.none.fl_str_mv Evidence of nonlinear Walker circulation feedbacks on extreme El Nino Pacific diversity: Observations and CMIP5 models
title Evidence of nonlinear Walker circulation feedbacks on extreme El Nino Pacific diversity: Observations and CMIP5 models
spellingShingle Evidence of nonlinear Walker circulation feedbacks on extreme El Nino Pacific diversity: Observations and CMIP5 models
Sulca, Juan
Walker circulation
central and eastern El Nino
CMIP5 models
nonlinear Bjerknes feedback
nonlinear Bjerknes feedback
positive stratification anomaly
positive stratification anomaly
shallow CISK mechanism
https://purl.org/pe-repo/ocde/ford#5.08.04
title_short Evidence of nonlinear Walker circulation feedbacks on extreme El Nino Pacific diversity: Observations and CMIP5 models
title_full Evidence of nonlinear Walker circulation feedbacks on extreme El Nino Pacific diversity: Observations and CMIP5 models
title_fullStr Evidence of nonlinear Walker circulation feedbacks on extreme El Nino Pacific diversity: Observations and CMIP5 models
title_full_unstemmed Evidence of nonlinear Walker circulation feedbacks on extreme El Nino Pacific diversity: Observations and CMIP5 models
title_sort Evidence of nonlinear Walker circulation feedbacks on extreme El Nino Pacific diversity: Observations and CMIP5 models
author Sulca, Juan
author_facet Sulca, Juan
author_role author
dc.contributor.author.fl_str_mv Sulca, Juan
dc.subject.none.fl_str_mv Walker circulation
topic Walker circulation
central and eastern El Nino
CMIP5 models
nonlinear Bjerknes feedback
nonlinear Bjerknes feedback
positive stratification anomaly
positive stratification anomaly
shallow CISK mechanism
https://purl.org/pe-repo/ocde/ford#5.08.04
dc.subject.es_PE.fl_str_mv central and eastern El Nino
CMIP5 models
nonlinear Bjerknes feedback
nonlinear Bjerknes feedback
positive stratification anomaly
positive stratification anomaly
shallow CISK mechanism
dc.subject.ocde.none.fl_str_mv https://purl.org/pe-repo/ocde/ford#5.08.04
description The work was performed using computational resources, that is, the HPC-Linux-Cluster, at the Laboratorio de Dinamica de Fluidos Geofisicos Computacionales (http://scah.igp.gob.pe/laboratorios/dfgc) at Instituto Geofisico del Peru (grants 101-2014-FONDECYT).
publishDate 2021
dc.date.accessioned.none.fl_str_mv 2024-05-30T23:13:38Z
dc.date.available.none.fl_str_mv 2024-05-30T23:13:38Z
dc.date.issued.fl_str_mv 2021
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.uri.none.fl_str_mv https://hdl.handle.net/20.500.12390/2931
dc.identifier.doi.none.fl_str_mv https://doi.org/10.1002/joc.6998
url https://hdl.handle.net/20.500.12390/2931
https://doi.org/10.1002/joc.6998
dc.language.iso.none.fl_str_mv eng
language eng
dc.relation.ispartof.none.fl_str_mv INTERNATIONAL JOURNAL OF CLIMATOLOGY
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv WILEY
publisher.none.fl_str_mv WILEY
dc.source.none.fl_str_mv reponame:CONCYTEC-Institucional
instname:Consejo Nacional de Ciencia Tecnología e Innovación
instacron:CONCYTEC
instname_str Consejo Nacional de Ciencia Tecnología e Innovación
instacron_str CONCYTEC
institution CONCYTEC
reponame_str CONCYTEC-Institucional
collection CONCYTEC-Institucional
repository.name.fl_str_mv Repositorio Institucional CONCYTEC
repository.mail.fl_str_mv repositorio@concytec.gob.pe
_version_ 1844883006110564352
spelling Publicationrp03980600Sulca, Juan2024-05-30T23:13:38Z2024-05-30T23:13:38Z2021https://hdl.handle.net/20.500.12390/2931https://doi.org/10.1002/joc.6998The work was performed using computational resources, that is, the HPC-Linux-Cluster, at the Laboratorio de Dinamica de Fluidos Geofisicos Computacionales (http://scah.igp.gob.pe/laboratorios/dfgc) at Instituto Geofisico del Peru (grants 101-2014-FONDECYT).The Walker circulation (WC) is essential for the formation and diversity of El Nino events. However, the nonlinear WC feedback during extreme Central and Eastern El Nino episodes (C and E episodes, respectively) has received little attention. This study used observational datasets and the Atmospheric Model Intercomparison Project (AMIP) and historical simulations from the Coupled Model Intercomparison Project Phase 5 (CMIP5). Eight out of 21 historical models that simulate the El Nino-Southern Oscillation (ENSO) nonlinearity also simulate the nonlinear Bjerknes feedback in C and E episodes. The opposite does not necessarily occur. However, the underestimation of E might limit the empirical determination. Moreover, few historical models simulate the shallow conditional instability of the second kind (CISK) mechanism. Positive C episodes feature an eastward shift in the ascending branch of the Pacific Walker cell (PWC), while shallow convection prevails over the far-eastern Pacific (FEP). Positive E events feature two anomalous ascending branches located over the central-western Pacific (170 degrees W) and FEP (80 degrees W). Positive anomalies in sea surface temperature over the FEP induce the second ascending branch. The positive stratification anomaly in the central Pacific Ocean, which is associated with overestimated Ekman feedback, limits the eastward displacement of the first ascending branch of the PWC. The net surface heat flux determines the duration of growth of the two ascending branches of the PWC during C and E events. Because of their coarse resolution, the historical models underestimate the positive stratification anomaly in the FEP, causing the quick demise of the second ascending branch.Consejo Nacional de Ciencia, Tecnología e Innovación Tecnológica - ConcytecengWILEYINTERNATIONAL JOURNAL OF CLIMATOLOGYinfo:eu-repo/semantics/openAccessWalker circulationcentral and eastern El Nino-1CMIP5 models-1nonlinear Bjerknes feedback-1nonlinear Bjerknes feedback-1positive stratification anomaly-1positive stratification anomaly-1shallow CISK mechanism-1https://purl.org/pe-repo/ocde/ford#5.08.04-1Evidence of nonlinear Walker circulation feedbacks on extreme El Nino Pacific diversity: Observations and CMIP5 modelsinfo:eu-repo/semantics/articlereponame:CONCYTEC-Institucionalinstname:Consejo Nacional de Ciencia Tecnología e Innovacióninstacron:CONCYTEC#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#20.500.12390/2931oai:repositorio.concytec.gob.pe:20.500.12390/29312024-05-30 15:51:42.583http://purl.org/coar/access_right/c_14cbinfo:eu-repo/semantics/closedAccessmetadata only accesshttps://repositorio.concytec.gob.peRepositorio Institucional CONCYTECrepositorio@concytec.gob.pe#PLACEHOLDER_PARENT_METADATA_VALUE#<Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="9aa3167e-c3fb-473d-a3fb-b4ce0b3781af"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>Evidence of nonlinear Walker circulation feedbacks on extreme El Nino Pacific diversity: Observations and CMIP5 models</Title> <PublishedIn> <Publication> <Title>INTERNATIONAL JOURNAL OF CLIMATOLOGY</Title> </Publication> </PublishedIn> <PublicationDate>2021</PublicationDate> <DOI>https://doi.org/10.1002/joc.6998</DOI> <Authors> <Author> <DisplayName>Sulca, Juan</DisplayName> <Person id="rp03980" /> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>WILEY</DisplayName> <OrgUnit /> </Publisher> </Publishers> <Keyword>Walker circulation</Keyword> <Keyword>central and eastern El Nino</Keyword> <Keyword>CMIP5 models</Keyword> <Keyword>nonlinear Bjerknes feedback</Keyword> <Keyword>nonlinear Bjerknes feedback</Keyword> <Keyword>positive stratification anomaly</Keyword> <Keyword>positive stratification anomaly</Keyword> <Keyword>shallow CISK mechanism</Keyword> <Abstract>The Walker circulation (WC) is essential for the formation and diversity of El Nino events. However, the nonlinear WC feedback during extreme Central and Eastern El Nino episodes (C and E episodes, respectively) has received little attention. This study used observational datasets and the Atmospheric Model Intercomparison Project (AMIP) and historical simulations from the Coupled Model Intercomparison Project Phase 5 (CMIP5). Eight out of 21 historical models that simulate the El Nino-Southern Oscillation (ENSO) nonlinearity also simulate the nonlinear Bjerknes feedback in C and E episodes. The opposite does not necessarily occur. However, the underestimation of E might limit the empirical determination. Moreover, few historical models simulate the shallow conditional instability of the second kind (CISK) mechanism. Positive C episodes feature an eastward shift in the ascending branch of the Pacific Walker cell (PWC), while shallow convection prevails over the far-eastern Pacific (FEP). Positive E events feature two anomalous ascending branches located over the central-western Pacific (170 degrees W) and FEP (80 degrees W). Positive anomalies in sea surface temperature over the FEP induce the second ascending branch. The positive stratification anomaly in the central Pacific Ocean, which is associated with overestimated Ekman feedback, limits the eastward displacement of the first ascending branch of the PWC. The net surface heat flux determines the duration of growth of the two ascending branches of the PWC during C and E events. Because of their coarse resolution, the historical models underestimate the positive stratification anomaly in the FEP, causing the quick demise of the second ascending branch.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication> -1
score 13.422088
Evidence of nonlinear Walker circulation feedbacks on extreme El Nino Pacific diversity: Observations and CMIP5 models
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