[M-IS21] [JJ] 南北両極のサイエンスと大型研究

[MIS21-P01] Mass loss of outlet glaciers and ice caps in the Qaanaaq region, northwestern Greenland

*Shin Sugiyama¹、Shun Tsutaki²、Daiki Sakakibara³、Evgeny A. Podolskiy³、Masahiro Minowa¹、Yoshihiko Ohashi¹、Jun Saito¹、Takanobu Sawagaki⁷、Sumito Matoba¹、Naoya Kanna³、Hiroyuki Enomoto⁶、Martin Funk⁴、Riccardo Genco⁵、Yvo Weidmann⁴、Guillaume Jouvet⁴、Julien Seguinot⁴ (1.Institute of Low Temperature Science, Hokkaido University、2.Earth Observation Research Center, Japan Aerospace Exploration Agency、3.Arctic Environment Research Center, National Institute of Polar Research、4.Laboratory for Hydraulics, Hydrology and Glaciology, ETH-Zurich, Switzerland、5.Department of Earth Science, University of Florence、6.National Institute of Polar Research、7.Hosei University)

キーワード：Greenland, ice sheet, ice cap, calving glacier

The Greenland ice sheet and peripheral ice caps are rapidly losing mass. Recently, ice mass loss is increasing particularly in northwestern Greenland (e.g. Enderlin and others, 2014). It is urgently important to understand the ongoing changes in this region, but observational data are sparse in northern Greenland. To quantify current ice mass loss in northwestern Greenland and better understand processes driving the mass loss, we studied outlet glaciers and ice caps in the Qaanaaq region as a part of GRENE Arctic Climate Change Research Project. Field and satellite observations were performed to quantify ice surface elevation change of outlet glaciers and ice caps (Saito et al., 2016; Tsutaki et al., 2016). Frontal position and ice speed of outlet glaciers were mapped by satellite data. We also studied processes occurring near the front of outlet glaciers to investigate interaction of the glaciers and the ocean (Ohashi et al., 2016). Our field activities include mass balance monitoring on Qaanaaq Ice Cap since 2012 (Sugiyama et al., 2014), integrated field observations near the calving front of Bowdoin Glacier since 2013 (Sugiyama et al., 2015; Podolskiy et al., 2016), and ocean measurements in front of the glaciers. In this contribution, we present the overview of the results obtained in the GRENE project, and introduce a new project established under the framework of ArCS (Arctic Challenge for Sustainability Project). Our presentation aims to stimulate community discussion on research plan in Greenlnad for Master Plan 2020 called by Science Council of Japan.

References
Enderlin, E. et al., 2014, An improved mass budget for the Greenland ice sheet. Geophys. Res. Lett., 41, 866–872.
Ohashi, Y., T. Iida, S. Sugiyama and S. Aoki. 2016. Spatial and temporal variations in high turbidity surface water off the Thule region, northwestern Greenland. Polar Science, 10(3), 270-277.
Podolskiy, E., S. Sugiyama, M. Funk, R. Genco, S. Tsutaki, F. Walter, M. Minowa, M. Ripepe. 2016. Tide-modulated ice flow variations drive seismicity near the calving front of Bowdoin Glacier, Greenland. Geophysical Research Letters, 43, doi:10.1002/2016GL067743.
Saito, J., S. Sugiyama, S. Tsutaki and T. Sawagaki. 2016. Surface elevation change on ice caps in the Qaanaaq region, northwestern Greenland. Polar Science, 10(3), 239-248.
Sugiyama, S., D. Sakakibara, S. Tsutaki, M. Maruyama and T. Sawagaki. 2015. Glacier dynamics near the calving front of Bowdoin Glacier, northwestern Greenland. J. Glaciol., 61(226), 223–232.
Sugiyama, S., D. Sakakibara, S. Matsuno, S. Yamaguchi, S. Matoba and T. Aoki. 2014. Initial field observations on Qaanaaq Ice Cap in northwestern Greenland. Ann. Glaciol., 55(66), 25–33.
Tsutaki, S., S. Sugiyama, D. Sakakibara and T. Sawagaki. 2016. Surface elevation changes during 2007-2013 on Bowdoin and Tugto Glaciers, northwestern Greenland. J. Glaciol.62(236), 1083-1092.