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A study of the air–sea interaction in the South Atlantic Convergence Zone through Granger causality
Author(s) -
Tirabassi Giulio,
Masoller Cristina,
Barreiro Marcelo
Publication year - 2015
Publication title -
international journal of climatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.58
H-Index - 166
eISSN - 1097-0088
pISSN - 0899-8418
DOI - 10.1002/joc.4218
Subject(s) - climatology , convergence zone , atmosphere (unit) , forcing (mathematics) , tropical atlantic , coupling (piping) , granger causality , convergence (economics) , mode (computer interface) , geology , environmental science , oceanography , sea surface temperature , meteorology , geography , mathematics , mechanical engineering , economic growth , computer science , engineering , economics , econometrics , operating system
Air–sea interaction in the region of the South Atlantic Convergence Zone ( SACZ ) is studied using Granger causality (GC) as a measure of directional coupling. Calculation of the area weighted connectivity indicates that the SACZ region is the one with largest mutual air–sea connectivity in the south Atlantic basin during summertime. Focusing on the leading mode of daily coupled variability, GC allows distinguishing four regimes characterized by different coupling: there are years in which the forcing is mainly directed from the atmosphere to the ocean, years in which the ocean forces the atmosphere, years in which the influence is mutual and years in which the coupling is not significant. A composite analysis shows that ocean‐driven events have atmospheric anomalies that develop first and are strongest over the ocean, while in events without coupling anomalies develop from the continent where they are strongest and have smaller oceanic extension.