DatIce project

Scientific context

Antarctic and Greenland ice cores provide a means to study the phase relationships of climate changes in both hemispheres. They also enable to study the timing between climate, and greenhouse gases or orbital forcings. One key step for such studies is to improve the absolute and relative precisions of ice core age scales (for ice and trapped gas), and beyond that, to try to reach the best consistency between chronologies of paleo records of any kind.

DatIce software

The DatIce tool is designed to increase the consistency between pre-existing (also called background) core chronologies. It formulates a variational inverse problem which aims at correcting three key quantities that uniquely define the core age scales: the accumulation rate, the total thinning function, and the close-off depth. For that purpose, it integrates paleo data constraints of many types among which age markers (with for instance documented volcanoes eruptions), and stratigraphic links (with for instance abrupt changes in methane concentration). A cost function is built that enables to calculate new chronologies by making a trade-off between all the constraints (background chronologies and paleo data). The method presented in Lemieux-Dudon et al (2010) has already been applied simultaneously to EPICA EDML and EDC, Vostok and NGRIP.
You can also have a look at our EGU presentation.


Currently, on going works are conducted at LSCE Saclay and LGGE Grenoble laboratories to construct a unified Antarctic chronologies by applying the DatIce tool with new ice cores and new sets of paleo measurements.

On going developments at the MOISE team

A posteriori diagnostic on the assimilation system, visualisation tools.

Please contact:

Habib Toye or Bénédicte Lemieux-Dudon or Eric Blayo



In case of problems, mail the administrators or file a bug

Powered By GForge Collaborative Development Environment