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Title: The role of the Atlantic Multidecadal Oscillation precondition in the teleconnection of different El Niño-Southern Oscillation types and impacts on the 15°N–15°S South American sector precipitation
Authors: Figliuolo, Guilherme C.
Andreoli, Rita Valéria
Kayano, Mary Toshie
Costa, Jean Antunes Custódio da
Rego, Willy Hagi Teles
Moraes, Djanir Sales de
Keywords: Atmospheric Pressure
Nickel Compounds
Atlantic Multidecadal Oscillations
Eastern Equatorial Pacific
Low Frequency Oscillations
Precipitation Anomalies
South America
Teleconnection Patterns
Tropical Atlantic
Atlantic Multidecadal Oscillation
Climate Effect
El Nino-southern Oscillation
Precipitation Assessment
Sea Surface Temperature
Walker Circulation
Atlantic Ocean
Atlantic Ocean (north)
Pacific Ocean
Pacific Ocean (central)
Pacific Ocean (east)
Issue Date: 2020
metadata.dc.publisher.journal: International Journal of Climatology
metadata.dc.relation.ispartof: Volume 40, Número 4, Pags. 1943-1964
Abstract: The Eastern Pacific (EP) and Central Pacific (CP) El Niño-Southern Oscillation (ENSO) types and their impacts on the tropical North Atlantic (TNA) SST variability and 15°N–15°S South American precipitation during the warm and cold phases of the Atlantic Multidecadal Oscillation (WAMO and CAMO) were evaluated during the 1901–2012 period. The results show more frequent ENSO events during the CAMO. The El Niño (EN) (La Niña [LN]) events, regardless of type (EP or CP), during the WAMO (CAMO) were accompanied by a warming (cooling) in the TNA after its mature phases. In these cases, extratropical teleconnection patterns are established through variations in the Pacific/North America (PNA) teleconnection pattern and are accompanied by variations in the Walker circulation. For the EN (LN) in the CAMO (WAMO), the tropical teleconnections occur predominant, through the Walker cell and the zonal inter-basin gradient, which is intensified due to the SST gradient between the eastern equatorial Pacific (non-neutral anomalies) and the equatorial Atlantic (neutral anomalies). These circulation pattern changes affect the precipitation patterns in the 15°N–15°S South American sector during December–January–February (D(0)JF(+1)) and March–April–May (MAM(+1)). The EP EN (EPEN) events are associated with the intensification of the negative precipitation anomalies in northeastern Brazil (NEB) during the WAMO and in the central part of the Amazon during the CAMO. In the case of CP EN (CPEN) events, the greatest differences between the AMO phases occur during MAM(+1), with reverse sign anomalies over northwestern South America. In the case of LN events, the largest differences occur in NEB, with reduced rainfall in the WAMO, regardless of type EP or CP. The results presented here highlight the role of low frequency oscillations in defining the teleconnection patterns between tropical Pacific and Atlantic Oceans, not discussed previously. © 2019 Royal Meteorological Society
metadata.dc.identifier.doi: 10.1002/joc.6309
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