Similar oscillations in a 60 - to 110 - year band are seen in North
Atlantic palaeoclimatic reconstructions through the last four centuries (Delworth and Mann, 2000; Gray et al., 2004).
Ruddiman and McIntyre (1981), p. 204, dismissed this since they saw no decrease in North
Atlantic biological productivity, but some later data supported the idea; in 1985 Broecker suspected the meltwater pulse was the entire cause of the Younger Dryas, but later he suggested it was only the trigger that set the timing for a switch between thermohaline circulation modes, Broecker et al. (1989)(whose «synthesis of
palaeoclimatic observations invigorated the community over the next decade,» according to Le Treut et al. (2007), p. 106); Broecker et al. (1990).