Japan Geoscience Union Meeting 2014

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Oral

Symbol A (Atmospheric, Ocean, and Environmental Sciences) » A-CG Complex & General

[A-CG36_30AM2] Science in the Arctic Region

Wed. Apr 30, 2014 11:00 AM - 12:45 PM 311 (3F)

Convener:*Sei-Ichi Saitoh(Faculty of Fisheries Sciences, Hokkaido University), Jun Inoue(National Instituteof Polar Resarch), Naomi Harada(Japan Agency for Marine-Earth Science and Technology), Rikie Suzuki(Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology), Chair:Naomi Harada(Japan Agency for Marine-Earth Science and Technology)

11:15 AM - 11:30 AM

[ACG36-23] Sensitivity of Response of Greenland Ice Sheet to Global Warming on Surface Mass Balance and Initialization methods

*Fuyuki SAITO1, Ayako ABE-OUCHI2, Kunio TAKAHASHI1 (1.JAMSTEC, 2.AORI, Univ. of Tokyo)

Keywords:Greenland ice sheet, Ice-sheet model

We present a series of numerical experiments of Greenland ice sheet under global warming condition using Ice sheet model for Integrated Earth system Studies (IcIES). In this study, influence on the simulation from the difference in the method to compute the surface mass balance is focused. Typically, ice sheet simulation is driven by a reference-anomaly method, in which the surface temperature and/or the accumulation are decomposed into the reference terms (e.g., observation), the anomaly (e.g., climate scenario from climate models). Then the surface melting is computed using parameterization such as positive degree-day (PDD) method with the temperature. These decomposed terms have own uncertainties, which may influence the ice-sheet simulation. In this study, impact of these properties to the present-day control case, as well as the response under uniform warming condition are discussed, which is thought be a useful and basic information of the property/sensitivity of the Greenland ice sheet. In addition, several initialization methods (free spin-up, fixed-topography spin-up, etc) are applied to IcIESin order to evaluate the influence of the error in the present-daysimulated topography to the short-term response of Greenland ice sheet.