Welcome to the Princeton Polar Ice website! We present research results on the mass change of Earth's ice sheets from gravity measured by the GRACE satellites, for Greenland Antarctica, and the Arctic, between about 2003 and about 2015.

This is a legacy site. Updates are to be found at Arizona Polar Ice.

More information, including published figures, updated figures, and additional discussion can be found on the Antarctica, the Greenland, and the Arctic pages. We maintaining a collection of open-source software for the localized analysis of GRACE data products.

Details about the methodology and the computer routines can be found on the Methods and Code pages.