Abstract
We have generated a high‐resolution record of alkenone sea surface temperature (SST) between 10–24 ka from Core MD01‐2421 off central Japan, in the northwestern Pacific. The cooling by 5°C from 21 ka to 12.8 ka implies the equatorward shift of the subarctic boundary in the northwestern Pacific by ∼2.8° in latitude. This shift was a result of the stronger summer Okhotsk High. The Okhotsk High was likely enhanced by the combined effects of El Niño‐like conditions in the tropical Pacific and the heating of the land surface of northeastern Siberia.
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