Does a dipole mode really exist in the South Atlantic Ocean?
作者： Hyacinth C. Nnamchi , Jianping Li , Raymond N. C. Anyadike
DOI: 10.1029/2010JD015579
关键词: Climatology 、 Dipole mode 、 Oceanography 、 Atmospheric circulation 、 Precipitation 、 Mode (statistics) 、 Peak intensity 、 Geology 、 Anomaly (natural sciences) 、 Pacific ocean 、 Earth-Surface Processes 、 Ecology (disciplines) 、 Earth and Planetary Sciences (miscellaneous) 、 Space and Planetary Science 、 Palaeontology 、 Forestry 、 Aquatic science 、 Atmospheric Science 、 Soil science 、 Geochemistry and Petrology 、 Geophysics 、 Water Science and Technology
摘要: [1] This study investigates the existence of a dipole mode in sea surface temperatures (SST) over South Atlantic Ocean (SAO), using observational and reanalysis data sets from 1950 to 2008. Our results demonstrate that an opposite SST mode, SAO (SAOD) occurs as anomalous waters northeastern part; is, Nino sector southwestern part off Argentina-Uruguay-Brazil coast are consistently anticorrelated all months. A typical SAOD episode has life cycle about eight months, although peak intensity which anomalies evidently coupled atmospheric circulation precipitation anomaly fields lasts for four months during austral winter (May–August). This atmosphere-ocean interaction mechanism appears be unique, distinct classical independent direct influence Pacific Ocean-based El or global variability. The may provide useful framework investigating climate variability improved predictions especially parts Africa Americas, some preliminary already indicated, e.g., is widely related these regions particularly winter.
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