[DLS] Dorthe Dahl-Jensen (Niels Bohr UCPH)

“Stories From Under the Ice”

Ice cores have revealed unique knowledge on the past climate and we have learned that climate can change abruptly, also before the anthropogenic time. The deepest and oldest ice drilled from the Greenland Ice Sheet (GrIS) contains basal sediments. Ice cores have been drilled the last 55 years, but the deepest ice containing basal materials has been preserved until now, and still holds undeciphered paleoclimatic messages. New and cutting-edge dating methods are used on the sample collection to reconstruct the age and the stability of the GrIS. A hypothesis to test is if the present GrIS formed at the time of the Mid Pleistocene Transition, 1.2 – 0.8 million years ago. The paleo-information of the past size of the GrIS tcan also constrain future tipping points and reduce the uncertainty on estimates of future sea level rise.

EAPS Department Lecture Series —

Weekly talks aimed to bring together the entire EAPS community, given by leading thinkers in the areas of geology, geophysics, geobiology, geochemistry, atmospheric science, oceanography, climatology, and planetary science. Runs concurrently with class 12.S501. 

Contact: eapsinfo@mit.edu