Upstream flow effects revealed in the EastGRIP ice core using Monte Carlo inversion of a two-dimensional ice-flow model

Gerber, Tamara Annina; Hvidberg, Christine Schøtt; Rasmussen, Sune Olander; Franke, Steven; Sinnl, Giulia; Grinsted, Aslak; Jansen, Daniela; Dahl-Jensen, Dorthe

doi:https://doi.org/10.5194/tc-15-3655-2021

Articles | Volume 15, issue 8

https://doi.org/10.5194/tc-15-3655-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/tc-15-3655-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 15, issue 8

Research article

|

06 Aug 2021

Research article |

| 06 Aug 2021

Upstream flow effects revealed in the EastGRIP ice core using Monte Carlo inversion of a two-dimensional ice-flow model

Tamara Annina Gerber, Christine Schøtt Hvidberg, Sune Olander Rasmussen, Steven Franke, Giulia Sinnl, Aslak Grinsted, Daniela Jansen, and Dorthe Dahl-Jensen

Supplement

https://doi.org/10.5194/tc-15-3655-2021-supplement

Data sets

AWI UWB radar data along ice flow upstream of the EGRIP drill site at the onset region of the Northeast Greenland Ice Stream D. Jansen, S. Franke, T. Binder, J. D. Paden, D. Steinhage, V. Helm, and O. Eisen https://doi.org/10.1594/PANGAEA.914258

Short summary

We simulate the ice flow in the onset region of the Northeast Greenland Ice Stream to determine the source area and past accumulation rates of ice found in the EastGRIP ice core. This information is required to correct for bias in ice-core records introduced by the upstream flow effects. Our results reveal that the increasing accumulation rate with increasing upstream distance is predominantly responsible for the constant annual layer thicknesses observed in the upper 900 m of the ice core.