Japan Geoscience Union Meeting 2014

Presentation information

Oral

Symbol A (Atmospheric, Ocean, and Environmental Sciences) » A-CC Cryospheric Sciences & Cold District Environment

[A-CC32_29PM2] Past environmental changes through ice core studies

Tue. Apr 29, 2014 4:15 PM - 6:00 PM 419 (4F)

Convener:*Kenji Kawamura(National Institute of Polar Research, Research Organization of Information and Systems), Minoru Ikehara(Center for Advanced Marine Core Research, Kochi University), Nozomu Takeuchi(Chiba University), Ayako Abe-Ouchi(Atmosphere and Ocean Research Institute, The University of Tokyo), Takuro Kobashi(National Institute of Polar Research), Chair:Minoru Ikehara(Center for Advanced Marine Core Research, Kochi University), Ayako Abe-Ouchi(Atmosphere and Ocean Research Institute, The University of Tokyo)

5:30 PM - 5:45 PM

[ACC32-13] Sea-level changes and crustal deformations in Greenland based on the loading histories derived from 3D ice sheet model

*Jun'ichi OKUNO1, Fuyuki SAITO2, Ayako ABE-OUCHI3, Kunio TAKAHASHI2 (1.NIPR, 2.JAMSTEC, 3.AORI, Univ. Tokyo)

Keywords:Greenland ice sheet, relative sea-level change, crustal deformation, isostasy

We study the implications of a recently published ice sheet history in Northern hemisphere and Greenland ice sheet, derived from the 3D thermo-mechanical ice sheet model (Ice Sheet for Integrated Earth system Studies: IcIES developed by Abe-Ouchi et al. 2013). To characterize the effects of this glaciologically consistent ice sheet history, we examine the time-variations of various geophysical quantities in response to the ice and water mass redistributions. They include vertical uplift and subsidence, global patterns of sea-level change, and regional sea-level variations along the coasts of Greenland. Relative sea-level (RSL) changes in response to past ice and water load variations are obtained solving the sea-level equation, which accounts for the crustal deformation due to glacio-isostatic adjustment (GIA). In this study, we report the predictions of RSL and geodetic signals in Greenland induced by GIA process based on the glaciologically and climatologically consistent ice loading history. And also, we show the temporal and spatial characteristics of predicted geophysical signals in Greenland in comparison with these observations. We expect that using the ice sheet histories derived from IcIES as input in GIA model may put better constraints on postglacial rebound and current rates of crustal deformation.