A, top, gray-scale measurements of sediments in the Cariaco basin, north of Venezuela. Sediments deposited during the cold Younger Dryas period (YD) are lighter than those of the preceding Boelling/Alleroed period (BA) and the subsequent post-glacial period. B, bottom, variation in atmospheric carbon-14, as calculated from comparison of measured 14C ages with calendar dates of Cariaco basin sediments from counting annual laminations. Note the increase of 50%o (5%) in delta 14C during the first 200 years of the Younger Dryas.
Source: Wallace S. Broecker, "Paleocean Circulation During the Last Deglaciation: A Bipolar Seesaw?," Paleoceanography Vol. 13, no. 2 (April, 1998), pp. 119-121.
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Last modified by pib on October 28, 2003.