日本地球惑星科学連合2018年大会

講演情報

[EJ] Eveningポスター発表

セッション記号 M (領域外・複数領域) » M-IS ジョイント

[M-IS06] 南大洋・南極氷床が駆動する全球気候変動

2018年5月21日(月) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:関 宰(北海道大学低温科学研究所)、岡 顕(東京大学大気海洋研究所)、真壁 竜介(国立極地研究所、共同)、植村 立(琉球大学 理学部)

[MIS06-P15] A new research project on the interaction of the solid Earth and the Antarctic Ice Sheet: Summary of the first year activities

*福田 洋一1西島 潤2風間 卓仁1中村 和樹3土井 浩一郎4菅沼 悠介4奥野 淳一4新谷 昌人5金田 平太郎6青山 雄一4三浦 英樹4 (1.京都大学大学院理学研究科、2.九州大学大学院工学研究院、3.日本大学工学部、4.国立極地研究所、5.東京大学地震研究所、6.千葉大学大学院理学研究科)

キーワード:GIA、氷床融解、海面上昇、東南極

A new research project of "Grant-in-Aid for Scientific Research on Innovative Areas" funded by JSPS (Japan Society for the Promotion of Science) has recently been launched. The title of the project is "Giant reservoirs of heat/water/material: Global environmental changes driven by Southern Ocean and Antarctic Ice Sheet", and as a five years project, is aiming to establish a new research area for Antarctic environmental system science.

The project consists of 7 research topics, including Antarctic ice sheet and Southern ocean sciences, new observation methodology, modeling and other interdisciplinary topics, and we are involved in the topic A02-2, "Interaction of the solid Earth and the Antarctic Ice Sheet".

The Antarctic ice sheet, which relates to the global climate changes through the sea level rise and ocean circulation, is an essential element of the Earth system for predicting the future environment changes. Thus many studies of the ice sheet changes have been conducted by means of geomorphological, geological, geodetic surveys, as well as satellite gravimetry and satellite altimetry.

For these studies, one of the largest uncertainties is the effects of GIA (Glacial Isostatic Adjustment), which is the viscoelastic response of the solid Earth to the loading mass changes. Although GIA is a key to investigate the interaction between the solid Earth and the ice sheet changes, in-situ data for constraining GIA models are very few in East Antarctica and this is the main reason of the large inconsistency among the GIA models in Antarctica. Therefore we plan to conduct geomorphological, geological and geodetic surveys in the inland mountain areas and the coastal areas including the surrounding areas of a Japanese station Syowa in East Antarctica. Combining these new observations with other in-site data, various satellite data and numerical modeling, we aim to estimating a precise GIA model, constructing a reliable ice melting history after the last glacial maximum and obtaining the viscoelastic structure of the Earth's interior.

A part of the first year activities, we have conducted absolute gravity measurements and GNSS observations at several outcrop areas near Syowa station, and other field surveys. In the presentation, we will report the preliminary results of these surveys and the outline of other activities as well as the five years research plans.

This study was partially supported by JSPS KAKENHI Grant No. 17H06321.