02308nas a2200337   4500000000100000000000100001008004100002260000800043653005000051653006600101653005200167653004400219653004100263653001700304653001900321653001600340100002200356700001800378700001700396700001900413700001900432700001700451700001800468700002200486245007900508856004300587300001100630490000700641520130800648020001401956       2006                            d  bAGU10a1135 Geochronology: Correlative geochronology10a1512 Geomagnetism and Paleomagnetism: Environmental magnetism10a1605 Global Change: Abrupt/rapid climate change10a1616 Global Change: Climate variability10a1641 Global Change: Sea level change10adeglaciation10aNorth Atlantic10aoverturning1 aJennifer Stanford1 aEelco Rohling1 aSally Hunter1 aAndrew Roberts1 aSune Rasmussen1 aEdouard Bard1 aJerry McManus1 aRichard Fairbanks00aTiming of meltwater pulse 1a and climate responses to meltwater injections  uhttp://dx.doi.org/10.1029/2006PA001340  aPA41030 v213 aThe temporal relationship between meltwater pulse 1a (mwp-1a) and the climate history of the last deglaciation remains a subject of debate. By combining the Greenland Ice Core Project δ 18O ice core record on the new Greenland ice core chronology 2005 timescale with the U/Th-dated Barbados coral record, we conclusively derive that mwp-1a did not coincide with the sharp B\olling warming but instead with the abrupt cooling of the Older Dryas. To evaluate whether there is a relationship between meltwater injections, North Atlantic Deep Water (NADW) formation, and climate change, we present a high-resolution record of NADW flow intensity from Eirik Drift through the last deglaciation. It indicates only a relatively minor 200-year weakening of NADW flow, coincident with mwp-1a. Our compilation of records also indicates that during Heinrich event 1 and the Younger Dryas there were no discernible sea level rises, and yet these periods were characterized by intense NADW slowdowns/shutdowns. Clearly, deepwater formation and climate are not simply controlled by the magnitude or rate of meltwater addition. Instead, our results emphasize that the location of meltwater pulses may be more important, with NADW formation being particularly sensitive to surface freshening in the Arctic/Nordic Seas.  a0883-8305