A 1600-year history of the Labrador Current off Nova Scotia

摘要: A multicore from Emerald Basin, on the conti- nental margin off Nova Scotia, has a modern 14 C age at top, and other dates indicate linear sedimenta- tion rate of � 30 cm/ka to 1600 calendar years BP. This is great enough record century-to-millennial scale changes in surface deep (� 250 m) waters basin that are influenced by Labrador Current. We applied five proxies for seawater temperature sediments including percent abundance oxygen isotope ratio (d 18 O) polar planktonic foraminifer N. pachyderma (s.), unsaturation alkenones (U k¢ 37) produced prymnesiophyte phytoplankton, d O Mg/Ca benthic foraminifera. All ocean warmed suddenly sometime past 150 or so. The exact timing this event uncertain because dating inaccurate recent centuries, but abrupt warming probably correlates with widespread evidence Arctic nineteenth century. Because Canadian Archipelago one two main sources Current, melting ice caps region may have affected Current properties. Before warming, sea was continually lower 1-2 C, bottom water colder about 6 Basin. These results suggest there no Medieval Warm Period coastal Scotia. also medieval archipelago, it seems likely Baffin Bay least as far south Scotia were cold 1500 years.