01911nas a2200289   4500000000100000000000100001008004100002260000800043653004400051653008200095653005900177653005900236653004500295653002700340653002000367653003100387100001900418700001200437700001800449700001700467245008700484856004300571300001100614490000700625520097500632020001401607       2007                            d  bAGU10a1616 Global Change: Climate variability10a3022 Marine Geology and Geophysics: Marine sediments: processes and transport10a4513 Oceanography: Physical: Decadal ocean variability10a4576 Oceanography: Physical: Western boundary currents10a9325 Geographic Location: Atlantic Ocean10adeep ocean circulation10adrift sediments10aNorth Atlantic Oscillation1 aK. Boessenkool1 aI. Hall1 aH. Elderfield1 aI. Yashayaev00aNorth Atlantic climate and deep-ocean flow speed changes during the last 230 years  uhttp://dx.doi.org/10.1029/2007GL030285  aL136140 v343 aVariations in the near-bottom flow speed of Iceland-Scotland Overflow Water (ISOW) are documented in a 230-year-long deep-sea sediment record from the eastern flank of Reykjanes Ridge in the subpolar North Atlantic at (sub)decadal time scales. For recent decades, the ISOW palaeocurrent reconstructions show similarities with observational hydrographic data. Furthermore, recent ISOW flow changes fall mostly within the range of its variability of the past 230 years. The record also reveals a hitherto unrecognized coupling of deep flow speeds in the subpolar North Atlantic with the North Atlantic Oscillation (NAO) index, with more (less) vigorous ISOW flow during negative (positive) phases of the NAO. Our results suggest that the changes in ISOW vigor are largely controlled by the transport and characteristics of Labrador Sea Water rather than variations in the overflow itself, with implications for the meridional overturning of the Atlantic Ocean and climate.  a0094-8276