GEOPHYSICAL MONOGRAPH SERIES, VOL. 193, PP. 1-14, 2011
Abrupt Climate Change Revisited
This geophysical monograph volume contains a collection of papers presented at the 2009 AGU Chapman Conference on Abrupt Climate
Change. Paleoclimate records derived from ice cores, lakes, and marine sedimentary archives illustrate rapid changes in the
atmosphere-cryosphere-ocean system. Several proxy records and two data-model comparison studies simulate Atlantic meridional
overturning circulation during the last deglaciation and millennial-scale temperature oscillations during the last glacial
cycle and thereby provide new perspectives on the mechanisms controlling abrupt climate changes. Two hypotheses are presented
to explain deep Southern Ocean carbon storage, the rapid increase of the atmospheric carbon dioxide, and retreat of sea ice
in the Antarctic Ocean during the last deglaciation. A synthesis of two Holocene climate events at approximately 5.2 ka and
4.2 ka highlights the potential of a rapid response to climate forcing in tropical systems through the hydrological cycle.
Both events appear contemporaneous with the collapse of ancient civilizations in low-latitude regions where roughly half of
Earth's population lives today.
Citation: Rashid, H.,