Low-frequency climate variability in the Atlantic basin during the 20th century
Yves Marcel Tourre; Shlomit Paz; Yochanan Kushnir; Warren B. White
- Low-frequency climate variability in the Atlantic basin during the 20th century
Tourre, Yves Marcel
White, Warren B.
- Lamont-Doherty Earth Observatory
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- Atmospheric Science Letters
- From joint sea surface temperature/sea level pressure (SST/SLP) EOF analyses, lowfrequency variability modes are compared. The multi-decadal oscillation (MDO) changed phases twice during the 20th century, with its north Atlantic SST patterns resembling the Atlantic multi-decadal oscillation (AMO). The quasi-decadal oscillation (QDO) SST patterns displayed a double tripole configuration over the entire Atlantic basin, leading to tropical inter-hemispheric out-of-phase relationship. From the mid-1960s onward, while ST anomalies were negative to the north (negative phases of MDO/AMO), the Sahelian drought persisted with a weaker hurricane power dissipation index (PDI). During that period, the QDO modulated the intensity of the Sahelian drought.
- Physical oceanography
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