Cooling North But Not South

Science  05 Oct 2007:
Vol. 318, Issue 5847, pp. 13l
DOI: 10.1126/science.318.5847.13l

Around 13,000 years ago, during the last transition from glacial to warm conditions, a severe cooling event called the Younger Dryas plunged the North Atlantic region into 1500 years of low temperatures. Whether the Younger Dryas also was expressed in the Southern Hemisphere has been a topic of considerable debate. Barrows et al. (p. 86) present a pair of records that show an absence of Younger Dryas cooling in the Southern Hemisphere in and near New Zealand. By dating a moraine in South Island, New Zealand, and by constructing a sea-surface temperature record of nearby Pacific Ocean waters, the authors show that this region remained warm during the Younger Dryas interval. The moraine that the authors dated is one that was previously thought to have recorded Younger Dryas cooling.

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