*SST = Sea Surface Temperatures"The AMO, an indicator of sea surface temperature (SST) variations in the North Atlantic, has been argued to arise from natural climate variations in the thermohaline circulation 1,2,4. Alternatively, it could be primarily driven by alterations in levels of sulfate aerosols. We argue that the weight of the evidence points towards natural oceanic variability being the principal driver of the AMO. The AMO phase was classified as being positive from 1878–1899, 1926–1969 and 1995–2012, and negative from 1900–1925 and 1970–1994.
Positive AMO phases are characterized by above-average far North and tropical Atlantic SSTs, below-average tropical Atlantic sea level pressures (SLPs), and reduced levels of tropical Atlantic vertical windshear. All three of these conditions are known to create a more favourable environment for Atlantic
hurricane formation and intensification"
[Voor 36% gewijzigd door hansdegit op 14-09-2015 08:57]