Climate Change on Millennial Time Scale During the Last Interglacial-Glacial Period Heinrich events, Bond cycles, D/O cycles
Heinrich 1988 H1 14,300 H2 21,000 H3 27,000 H4 35,500 H5 52,000 H6 69,000
Bond 1992 1. Different IRD composition with the ambient sediments. 2. H1 and H2 in Labrador Sea contain thick layers rich in detrital carbonate and westward increase in thickness. 3. The <2m fraction in H1, 2, 4, 5, 6 have an average K/Ar age of 897 Myr.
Dansgaard 1993 1. Climate in the North Atlantic region is able to reorganize itself rapidly. 2. Climate instability was not confined to the last glaciation, but appears also to have been marked during the last interglacial. summit
Bond 1993 1. The SST from North Atlantic sediments closely match the ice-core record. 2. The shifts in ocean-atmosphere temperature bundle into cooling cycles, lasting on average 10 to 15 kyr. 3. Each cycle culminated in a discharge of icebergs into the North Atlantic , followed by an abrupt shift to a warmer climate.
Bond 1995 1. The calving cycles correlate with warm-cold oscillations, called Dansgaard-Oeschger events, in Greenland ice cores. 2. Each cycle records synchronous discharges of ice from different sources, and the cycles are decoupled from SST. 3. A mechanism operating within the atmosphere that caused rapid oscillations in air temperatures above Greenland and in calving from more than one ice sheets.
Sea-level and isotopic composition change at the end of the Last Glaciation
Reconstruction of SST in August (open circles) and February (dots) in the southeastern Norwegian Sea