Physics
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29n..16m&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 14, pp. 16-1, CiteID 1671, DOI 10.1029/2001GL013514
Physics
3
Oceanography: General: Paleoceanography, Oceanography: General: Numerical Modeling, Global Change: Climate Dynamics (3309)
Scientific paper
Between 20 and 80 kyr ago several cooling cycles occurred in the Northern Hemisphere which culminated in a discharge of icebergs into the North Atlantic. These so called ``Heinrich Events'' (HEs) were followed by an abrupt shift to a warmer climate. Here we use a coupled ocean-atmosphere-sea ice model to study the response of the climate system under glacial conditions to a hypothetical HE. The HE is simulated by meltwater discharges and combined changes in land albedo and ice sheet topography mimicking a break-up of a considerable part of the Laurentide ice sheet. Despite very different initial strengths of the overturning circulation in the Northern Hemisphere, the model response to the HEs is qualitatively similar. A warming of ocean and atmosphere temperatures due to the topography/albedo changes is simulated after the iceberg discharge. North Atlantic Deep Water (NADW) formation drops and reestablishes due to the meltwater event.
Meissner Katrin J.
Schmittner Andreas
Weaver Andrew J.
Wiebe Edward C.
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