PhD Student: The Effects of Impurities on the Flow of Ice Sheets During Climate

普渡哥

DescriptionUnderstanding the rate of flow of ice in Earth’s large ice sheets is critically important for paleoclimate reconstruction and for predicting the fate of these ice sheets under potential climate change conditions.  Soluble impurities have been shown to have dramatic effects on the mechanical response of ice single crystals, including decreasing the strength, increasing the tensile ductility, and increasing the lifetime in secondary creep, and they affect recrystallization behavior.  In contrast, little is known about the effects of such impurities on the flow of polycrystalline ice, of which ice sheets are composed. The purpose of this project is to undertake a systematic examination of the effects of soluble impurities on the flow of polycrystalline ice as function of temperature, strain rate and impurity concentration using both impurity-doped and high-purity polycrystalline ice produced in the Ice Research Laboratory at Dartmouth. The initial microstructures and the microstructures after creep testing will be characterized using a variety of advanced techniques including scanning electron microscopy coupled with electron backscattered patterns, energy dispersive X-ray spectroscopy and electron channeling contrast imaging; and X-ray topography. The creep behavior will be modeled and related to the microstructure with a view to understanding the flow of ice sheets under various climate change scenarios.


Availability: immediate
To applyApplicants should submit a letter explicitly addressing their qualifications and motivations for the position as well as their date of availability, detailed CV in PDF format, and the names, email, and addresses of three professional references. Review of applicants will begin immediately and will continue until the positions are filled.
Enquiries and applications should be sent to Ian.Baker@Dartmouth.edu; 603-646-2184
Dartmouth College is an equal opportunity/affirmative action employer and strongly encourages applications from women and minorities.
Professor Ian Baker
Thayer School of Engineering
Dartmouth College
Hanover, NH 03755
U.S.A