Pollen analyses on two deep-sea records recovered in the eastern Atlantic between lat 37° and 4°N show two coeval peaks in wind-transported terrestrial elements (pollen and spores), mainly from dry, steppe-type formations, at 15 ka and at 10.3 ka. This may reflect the dominance of anticyclonic circulation during the cold phases of the last deglaciation, responsible for strong winds leading to the advection of polar air masses equatorward. At lat 37°N, the predominant influence of the westerlies was established after 9.3 ka.

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