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Atlantic multi-decadal oscillation (amo) a multi-decadal (65- to 75-year) fluctuation in the north atlantic, in which sea surface temperatures showed warm phases during roughly 1860 to 1880 and 1930 to 1960 and cool phases during 1905 to 1925 and 1970 to 1990 with a range of the order of 0.4°c | Source: IPCC

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