Title Cenozoic global ice-volume and temperature simulations with 1-D ice-sheet models forced by benthic delta 18O records
Author de Boer, B.; van de Wal, R.S.W.; Bintanja, R.; Lourens, L.J.; Tuenter, E.
Author Affil de Boer, B., Utrecht University, Institute for Marine and Atmospheric Research, Utrecht, Netherlands. Other: Royal Netherlands Meteorological Institute, Netherlands
Source Glaciology in the International Polar Year, prefaced by G.H. Gudmundsson. Annals of Glaciology, 51(55), p.23-33, . Publisher: International Glaciological Society, Cambridge, United Kingdom. ISSN: 0260- 3055
Publication Date 2010
Notes In English. Includes appendix. 38 refs. CRREL Acc. No: 64004753
Index Terms glacial geology; ice sheets; isotopes; oxygen; paleoclimatology; temperature; volume; Antarctica--Antarctic ice sheet; Greenland--Greenland ice sheet; Antarctic ice sheet; Antarctica; Arctic region; Cenozoic; global; Greenland; Greenland ice sheet; International Polar Year 2007-08; IPY 2007-08 Research Publications; isotope ratios; O-18/O- 16; one-dimensional models; reconstruction; stable isotopes
Abstract Variations in global ice volume and temperature over the Cenozoic era have been investigated with a set of one-dimensional (1- D) ice-sheet models. Simulations include three ice sheets representing glaciation in the Northern Hemisphere, i.e. in Eurasia, North America and Greenland, and two separate ice sheets for Antarctic glaciation. The continental mean Northern Hemisphere surface- air temperature has been derived through an inverse procedure from observed benthic delta 18O records. These data have yielded a mutually consistent and continuous record of temperature, global ice volume and benthic delta 18O over the past 35 Ma. The simple 1-D model shows good agreement with a comprehensive 3-D ice-sheet model for the past 3 Ma. On average, differences are only 1.0C for temperature and 6.2 m for sea level. Most notably, over the 35 Ma period, the reconstructed ice volume-temperature sensitivity shows a transition from a climate controlled by Southern Hemisphere ice sheets to one controlled by Northern Hemisphere ice sheets. Although the transient behaviour is important, equilibrium experiments show that the relationship between temperature and sea level is linear and symmetric, providing limited evidence for hysteresis. Furthermore, the results show a good comparison with other simulations of Antarctic ice volume and observed sea level.
URL http://www.igsoc.org/annals/v51/55/t55A010.pdf
Publication Type journal article
Record ID 300293