Japan Geoscience Union Meeting 2015

Presentation information


Symbol A (Atmospheric and Hydrospheric Sciences) » A-CG Complex & General

[A-CG31] Science in the Arctic Region

Tue. May 26, 2015 6:15 PM - 7:30 PM Convention Hall (2F)

Convener:*Nozomu Takeuchi(Chiba University), Tetsuya Hiyama(Hydrospheric Atmospheric Research Center, Nagoya University), Toru Hirawake(Faculty of Fisheries Sciences, Hokkaido University), Hiroshi Tanaka(Center for Computational Sciences, University of Tsukuba), Satonori Nozawa(Solar-Terrestrial Environment Laboratory)

6:15 PM - 7:30 PM

[ACG31-P04] Simulating soil carbon dynamics in Alaskan terrestrial ecosystems

*Xin WANG1, Masayuki YOKOZAWA2, Hazuki ARAKIDA3, Kensuke MORI4, Takesi ISE5, Miyuki KONNDOU6, Masao UCHIDA6, Keiji KUSHIDA7, Motomu TODA1 (1.Hiroshima University, 2.Shizuoka University, 3.Riken, 4.University of Calgary, 5.Kyoto University, 6.National institute for Environment Studies, 7.Nihon University)

A large amount of soil organic carbon (SOC) is stored in high-latitude boreal permafrost regions, accounting for twice as much as is in the atmosphere at present. In those regions, climate warming has often caused disturbances that may accelerate the rate of permafrost thaw and change SOC dynamics in both organic and mineral soils. In this study, we used a soil carbon dynamics model named Physical and Biogeochemical Soil Dynamics Model to examine how climate-induced disturbances could change SOC pools in the boreal forest and tundra terrestrial ecosystems in Alaska, especially focusing on the effect of fire disturbances on the permafrost soil layers. The results showed that the fire disturbance would reduce SOC stores substantially associated with the fire-induced thawing of permafrost. It is suggested that the vulnerability of the SOC stocks in the boreal region as affected by future warming is closely linked to the sensitivity of permafrost to wildfire disturbance.