Abstract

This article analyses the relations of the Atlantic multidecadal oscillation (AMO) and the El Niño-Southern Oscillation (ENSO) and their influence on the South American rainfall. The ENSO-related precipitation anomalous composites over South America show more (less) organized patterns with the significant anomalies occupying extensive (reduced) areas when ENSO and AMO are in the opposite (same) phase. The El Niño (La Niña) events in the cold (warm) AMO phase are, in general, stronger than those in the warm (cold) AMO phase. The strong El Niño (La Niña) events in the cold (warm) AMO phase are due to the presence of a negative (positive) inter-Pacific-Atlantic sea surface temperature (SST). The negative (positive) SST anomalies in the equatorial Atlantic reinforce the El Niño (La Niña) in the tropical Pacific through an anomalous Atlantic Walker circulation. In consequence, the ENSO-related precipitation anomalies over South America are more intense and with less horizontal structure under the existence of this connection between the climate variability of the tropical Atlantic and Pacific Oceans. As far as the authors know, the results presented here have not been discussed before and have important implications for regional climate monitoring, as well as for modelling studies. Copyright © 2013 Royal Meteorological Society

Full Text
Paper version not known

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.