A climatology of daily synoptic circulation patterns and associated surface meteorology over southern South America
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1007/s00382-019-04768-3 http://hdl.handle.net/11449/187579 |
Resumo: | Synoptic circulation patterns, defined as anomalies in sea level pressure (SLP), 500 hPa geopotential height (Z500), and 250 hPa wind speed (V250) and referred to as large-scale meteorological patterns (LSMPs), are characterized using the self-organizing maps approach over southern South America. Results show a wide range of possible LSMP types over a 37-year period of study. LSMP type variability can be summarized as a spectrum from patterns dominated by positive SLP and Z500 anomalies with a poleward displacement of the strongest 250 hPa winds, to patterns dominated by similar structures but with anomalies of opposite sign. The LSMPs found are connected with lower tropospheric temperature and wind, precipitation, and the frequency of atmospheric rivers (ARs). This highlights LSMPs more closely associated with anomalous and potentially impactful surface meteorology. Results show ARs as primary drivers of heavy precipitation over some of the region and connect their occurrence to driving synoptic dynamics. Two important low frequency modes of climate variability, the Southern Annular Mode (SAM) and the El Nino Southern Oscillation (ENSO), show some influence on the frequency of LSMP type, with the SAM more directly related to LSMP type modulation than ENSO. This comprehensive climatology of synoptic variability across southern South America has potential to aid in a mechanistic approach to studying climate change projections of temperature, precipitation, and AR frequency in climate models. |
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A climatology of daily synoptic circulation patterns and associated surface meteorology over southern South AmericaAtmospheric riversSouth AmericaSynoptic climatologySynoptic circulation patterns, defined as anomalies in sea level pressure (SLP), 500 hPa geopotential height (Z500), and 250 hPa wind speed (V250) and referred to as large-scale meteorological patterns (LSMPs), are characterized using the self-organizing maps approach over southern South America. Results show a wide range of possible LSMP types over a 37-year period of study. LSMP type variability can be summarized as a spectrum from patterns dominated by positive SLP and Z500 anomalies with a poleward displacement of the strongest 250 hPa winds, to patterns dominated by similar structures but with anomalies of opposite sign. The LSMPs found are connected with lower tropospheric temperature and wind, precipitation, and the frequency of atmospheric rivers (ARs). This highlights LSMPs more closely associated with anomalous and potentially impactful surface meteorology. Results show ARs as primary drivers of heavy precipitation over some of the region and connect their occurrence to driving synoptic dynamics. Two important low frequency modes of climate variability, the Southern Annular Mode (SAM) and the El Nino Southern Oscillation (ENSO), show some influence on the frequency of LSMP type, with the SAM more directly related to LSMP type modulation than ENSO. This comprehensive climatology of synoptic variability across southern South America has potential to aid in a mechanistic approach to studying climate change projections of temperature, precipitation, and AR frequency in climate models.Department of Geography Portland State UniversityDepartamento de Engenharia Ambiental Instituto de Ciência e Tecnologia UNESP-Univ. Estadual Paulista Campus São José dos CamposDepartment of Atmospheric and Oceanic Sciences University of California Los AngelesJet Propulsion Laboratory California Institute of TechnologyDepartamento de Engenharia Ambiental Instituto de Ciência e Tecnologia UNESP-Univ. Estadual Paulista Campus São José dos CamposPortland State UniversityUniversidade Estadual Paulista (Unesp)University of California Los AngelesCalifornia Institute of TechnologyLoikith, Paul C.Pampuch, Luana Albertani [UNESP]Slinskey, EmilyDetzer, JudahMechoso, Carlos R.Barkhordarian, Armineh2019-10-06T15:40:47Z2019-10-06T15:40:47Z2019-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1007/s00382-019-04768-3Climate Dynamics.1432-08940930-7575http://hdl.handle.net/11449/18757910.1007/s00382-019-04768-32-s2.0-85064568121Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengClimate Dynamicsinfo:eu-repo/semantics/openAccess2021-10-23T20:19:26Zoai:repositorio.unesp.br:11449/187579Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T16:02:03.504999Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
A climatology of daily synoptic circulation patterns and associated surface meteorology over southern South America |
title |
A climatology of daily synoptic circulation patterns and associated surface meteorology over southern South America |
spellingShingle |
A climatology of daily synoptic circulation patterns and associated surface meteorology over southern South America Loikith, Paul C. Atmospheric rivers South America Synoptic climatology |
title_short |
A climatology of daily synoptic circulation patterns and associated surface meteorology over southern South America |
title_full |
A climatology of daily synoptic circulation patterns and associated surface meteorology over southern South America |
title_fullStr |
A climatology of daily synoptic circulation patterns and associated surface meteorology over southern South America |
title_full_unstemmed |
A climatology of daily synoptic circulation patterns and associated surface meteorology over southern South America |
title_sort |
A climatology of daily synoptic circulation patterns and associated surface meteorology over southern South America |
author |
Loikith, Paul C. |
author_facet |
Loikith, Paul C. Pampuch, Luana Albertani [UNESP] Slinskey, Emily Detzer, Judah Mechoso, Carlos R. Barkhordarian, Armineh |
author_role |
author |
author2 |
Pampuch, Luana Albertani [UNESP] Slinskey, Emily Detzer, Judah Mechoso, Carlos R. Barkhordarian, Armineh |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Portland State University Universidade Estadual Paulista (Unesp) University of California Los Angeles California Institute of Technology |
dc.contributor.author.fl_str_mv |
Loikith, Paul C. Pampuch, Luana Albertani [UNESP] Slinskey, Emily Detzer, Judah Mechoso, Carlos R. Barkhordarian, Armineh |
dc.subject.por.fl_str_mv |
Atmospheric rivers South America Synoptic climatology |
topic |
Atmospheric rivers South America Synoptic climatology |
description |
Synoptic circulation patterns, defined as anomalies in sea level pressure (SLP), 500 hPa geopotential height (Z500), and 250 hPa wind speed (V250) and referred to as large-scale meteorological patterns (LSMPs), are characterized using the self-organizing maps approach over southern South America. Results show a wide range of possible LSMP types over a 37-year period of study. LSMP type variability can be summarized as a spectrum from patterns dominated by positive SLP and Z500 anomalies with a poleward displacement of the strongest 250 hPa winds, to patterns dominated by similar structures but with anomalies of opposite sign. The LSMPs found are connected with lower tropospheric temperature and wind, precipitation, and the frequency of atmospheric rivers (ARs). This highlights LSMPs more closely associated with anomalous and potentially impactful surface meteorology. Results show ARs as primary drivers of heavy precipitation over some of the region and connect their occurrence to driving synoptic dynamics. Two important low frequency modes of climate variability, the Southern Annular Mode (SAM) and the El Nino Southern Oscillation (ENSO), show some influence on the frequency of LSMP type, with the SAM more directly related to LSMP type modulation than ENSO. This comprehensive climatology of synoptic variability across southern South America has potential to aid in a mechanistic approach to studying climate change projections of temperature, precipitation, and AR frequency in climate models. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-10-06T15:40:47Z 2019-10-06T15:40:47Z 2019-01-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1007/s00382-019-04768-3 Climate Dynamics. 1432-0894 0930-7575 http://hdl.handle.net/11449/187579 10.1007/s00382-019-04768-3 2-s2.0-85064568121 |
url |
http://dx.doi.org/10.1007/s00382-019-04768-3 http://hdl.handle.net/11449/187579 |
identifier_str_mv |
Climate Dynamics. 1432-0894 0930-7575 10.1007/s00382-019-04768-3 2-s2.0-85064568121 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Climate Dynamics |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128596228702208 |