Deep water production in the GIN Seas: The Nd record from Feni Drift

摘要: The Greenland, Iceland, Norwegian (GIN) Seas are a key area of modern deep water production. Recent evidence suggests and intermediate was generated continuously in the GIN during last glaciation contributed to Glacial North Atlantic Intermediate Water (GNAIW) [1]. However, various attempts reconstruct surface conditions have resulted contradictory interpretations [2], thus impeding efforts determine role response production specific climate events deglaciation. To gauge variations intensity over 45 ka, Nd isotope composition (.Nd) from hydrous/authigenic FeMn oxyhydroxides marine sediments used as an inorganic mass tracer. .Nd record, ODP Site 980 (Feni Drift), is well placed capture exchanges between overflow incursion southern sourced waters (SSW), both which identifiable by their distinct range .Nd. record indicates rapid radiogenic excursions up +2.8 units toward more end member coeval with Heinrich 19 ka meltwater pulse. These shifts most likely reflect SSW Rockall Trough when ceased or dramatically reduced, implying concomitant reduction GNAIW Atlantic. return less intermittent present LGM. correlates timing slowdown meridional overturning circulation (MOC) inferred Pa/Th proxy records [3, 4], testifies variable rates cooling advance retreat NW European ice sheets.