The Pleistocene Glacial Cycles and Millennial-Scale Climate Variability
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The Pleistocene Glacial Cycles and Millennial-Scale Climate Variability. / Ditlevsen, Peter.
I: Atmosphere - Ocean, Bind 60, 17.06.2022, s. 233-244.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - The Pleistocene Glacial Cycles and Millennial-Scale Climate Variability
AU - Ditlevsen, Peter
PY - 2022/6/17
Y1 - 2022/6/17
N2 - The Pleistocene glacial cycles are the most prominent climate variations over the past three million years. They are the climatic response to variations in the incoming solar radiation, insolation, due to the deviations of the Earth's orbital configuration from the perfect Keplerian orbit is caused by the influence of the other planets in the solar system. This climatic response to astronomical forcing is highly non-linear, which is most pronounced expressed in the changing duration of the glacial cycles through the Middle Pleistocene Transition around a million years ago, where the duration of glacial cycles changed from 40 kyr to approximately 100 kyr without any corresponding changes in the astronomical forcing. In the late Pleistocene glaciations, the Northern Hemisphere ice sheets have grown larger than before, causing an increased cooling through the ice-albedo feedback, which makes it harder with increased insolation to cause deglaciation. The cold climate with extended glaciations has also made the climate more unstable, where strong millennial-scale oscillations related to changes in the Atlantic Meridional Overturning Circulation are observed in the paleoclimatic records.
AB - The Pleistocene glacial cycles are the most prominent climate variations over the past three million years. They are the climatic response to variations in the incoming solar radiation, insolation, due to the deviations of the Earth's orbital configuration from the perfect Keplerian orbit is caused by the influence of the other planets in the solar system. This climatic response to astronomical forcing is highly non-linear, which is most pronounced expressed in the changing duration of the glacial cycles through the Middle Pleistocene Transition around a million years ago, where the duration of glacial cycles changed from 40 kyr to approximately 100 kyr without any corresponding changes in the astronomical forcing. In the late Pleistocene glaciations, the Northern Hemisphere ice sheets have grown larger than before, causing an increased cooling through the ice-albedo feedback, which makes it harder with increased insolation to cause deglaciation. The cold climate with extended glaciations has also made the climate more unstable, where strong millennial-scale oscillations related to changes in the Atlantic Meridional Overturning Circulation are observed in the paleoclimatic records.
KW - glacial cycles
KW - ice age models
KW - Milankovitch theory
KW - millennial-scale climate variability
KW - ice core records
KW - dynamical climate models
KW - ICE-SHEET
KW - STOCHASTIC RESONANCE
KW - MODEL
KW - OSCILLATIONS
KW - TRANSITION
KW - EVENTS
KW - ORIGIN
KW - RECORD
KW - OCEAN
KW - TIME
U2 - 10.1080/07055900.2022.2077172
DO - 10.1080/07055900.2022.2077172
M3 - Journal article
VL - 60
SP - 233
EP - 244
JO - Atmosphere - Ocean
JF - Atmosphere - Ocean
SN - 0705-5900
ER -
ID: 315467639