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dc.contributor.author
Vera, Carolina Susana
dc.date.available
2021-11-25T05:15:40Z
dc.date.issued
2003-01
dc.identifier.citation
Vera, Carolina Susana; Interannual and interdecadal variability of atmospheric synoptic-scale activity in the Southern Hemisphere; American Geophysical Union; Journal of Geophysical Research; 108; C4; 1-2003; 1-10
dc.identifier.issn
2169-9291
dc.identifier.uri
http://hdl.handle.net/11336/147369
dc.description.abstract
[1] A rotated empirical orthogonal function analysis was applied to anomalies of July atmospheric short time scale variability (or storm tracks) over the Southern Hemisphere (SH) using NCEP reanalyses. The study reveals the existence of two leading modes of storm-track variations, the first one describing storm-track changes along the subtropical Pacific and the second one associated with variations over southeast Pacific Ocean. The principal components of both modes exhibit significant variability on interannual (2–7 years) and interdecadal (longer than 7 years) time scales. The interannual variation of the first mode is closely linked to ENSO variability. The corresponding signal on SST anomalies shows a conspicuous maximum over central equatorial Pacific, while the signature on geopotential-height anomalies shows the typical Pacific South America pattern characterized by a Rossby wave train propagating poleward from the tropics. On interdecadal time scales, the first mode is related to SST anomalies over the subtropical portions of the Pacific, Atlantic, and Indian Oceans and to a Rossby wave train with strongest signals over the southeast Pacific and the Antarctic Peninsula. The second mode that represents storm-track changes west of the Antarctic Peninsula is related on interannual time scales to SST anomalies over western Pacific between 40°S and 20°S, while on interdecadal time scales, it does not seem to be significantly related to SST changes in any of the basins. In particular, the spatial signature of the REOF2 interdecadal variability on the SH circulation corresponds to the well-known high latitude mode characterized by a monopole over the Antarctica and a three-wave pattern at middle latitudes.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Geophysical Union
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
INTERANNUAL VARIATIONS
dc.subject
INTERDECADAL VARIATIONS
dc.subject
SOUTHERN HEMISPHERE
dc.subject
STORM TRACKS
dc.subject
SYNOPTIC-SCALE VARIABILITY
dc.subject.classification
Investigación Climatológica
dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Interannual and interdecadal variability of atmospheric synoptic-scale activity in the Southern Hemisphere
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2021-01-18T21:03:52Z
dc.identifier.eissn
0148-0227
dc.journal.volume
108
dc.journal.number
C4
dc.journal.pagination
1-10
dc.journal.pais
Estados Unidos
dc.description.fil
Fil: Vera, Carolina Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; Argentina
dc.journal.title
Journal of Geophysical Research
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1029/2000JC000406
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2000JC000406
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