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dc.contributor.authorLoikith, Paul C.
dc.contributor.authorPampuch, Luana Albertani [UNESP]
dc.contributor.authorSlinskey, Emily
dc.contributor.authorDetzer, Judah
dc.contributor.authorMechoso, Carlos R.
dc.contributor.authorBarkhordarian, Armineh
dc.identifier.citationClimate Dynamics.
dc.description.abstractSynoptic 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.en
dc.relation.ispartofClimate Dynamics
dc.subjectAtmospheric rivers
dc.subjectSouth America
dc.subjectSynoptic climatology
dc.titleA climatology of daily synoptic circulation patterns and associated surface meteorology over southern South Americaen
dc.contributor.institutionPortland State University
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionUniversity of California Los Angeles
dc.contributor.institutionCalifornia Institute of Technology
dc.description.affiliationDepartment of Geography Portland State University
dc.description.affiliationDepartamento de Engenharia Ambiental Instituto de Ciência e Tecnologia UNESP-Univ. Estadual Paulista Campus São José dos Campos
dc.description.affiliationDepartment of Atmospheric and Oceanic Sciences University of California Los Angeles
dc.description.affiliationJet Propulsion Laboratory California Institute of Technology
dc.description.affiliationUnespDepartamento de Engenharia Ambiental Instituto de Ciência e Tecnologia UNESP-Univ. Estadual Paulista Campus São José dos Campos
dc.rights.accessRightsAcesso aberto
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