Teleconnection patterns in the Southern Hemisphere represented by ECMWF and NCEP S2S project models and influences on South America precipitation

Autor(es)

Cavalcanti, Iracema F. A. ^[1] ; Barreto, Naurinete J. C. ^[1] ; Alvarez, Mariano S. ^{[2, 3, 4]} ; Osman, Marisol ^{[2, 3, 4]} ; Coelho, Caio A. S. ^[1]

Afiliação do(s) autor(es)

^[1] Natl Inst Space Res INPE, Ctr Weather Forecast & Climate Studies CPTEC, Sao Paulo, SP - Brazil

^[2] Univ Buenos Aires, Ctr Invest Mar & Atmosfera CIMA, CONICET, Buenos Aires, DF - Argentina

^[3] Univ Buenos Aires, Dept Ciencias Atmosfera & Oceans DCAO FCEN UBA, Fac Ciencias Exactas & Nat, Buenos Aires, DF - Argentina

^[4] CNRS IRD CONICET UBA, Inst Franco Argentino Estudio Clima & Sus Impacto, Buenos Aires, DF - Argentina

• Tipo de documento: Artigo Científico
• Fonte: METEOROLOGICAL APPLICATIONS; v. 28, n. 4 JUL 2021.
• Citações Web of Science: 0

Resumo

Precipitation predictions in the sub-seasonal timescale are very important for several sectors such as agriculture and energy in regions of South America that are very much affected by precipitation extremes, both excess and lack of rain. The aim of the present study is to investigate the ability of two S2S project models (ECMWF and NCEP) to detect the Southern Hemisphere teleconnections in model hindcasts and the associated anomalous precipitation over South America. The period of analyses is 1999-2010 for the austral summer season (December-January-February). Both models represented adequately the Southern Annular Mode (SAM) pattern in predictions up to 4 weeks ahead and the Pacific South America (PSA) pattern up to 3 weeks. Atmospheric variables of observed extreme cases of SAM were well predicted by the two models, 2 and 3 weeks in advance. The models predicted well atmospheric variables in observed extreme cases of PSA, 2 weeks in advance and with less intensity in the third week. Precipitation anomaly signals associated with these modes were well predicted 2 weeks in advance, although with different intensities. The good ability of the models hindcast in predicting teleconnection patterns and precipitation anomalies over South America provides more confidence to use predictions at sub-seasonal timescale. (AU)

• Processo FAPESP: 15/50687-8 - Serviços climáticos através de co-produção de conhecimento: uma iniciativa europeia e da América do Sul para fortalecer as ações de adaptação da sociedade a eventos extremos
• Beneficiário: Iracema Fonseca de Albuquerque Cavalcanti
• Modalidade de apoio: Auxílio à Pesquisa - Temático