2011 Fiscal Year Final Research Report
The actual states of permafrost degradation
| Project/Area Number |
21310001
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Hokkaido University |
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Principal Investigator |
ISHIKAWA Mamoru 北海道大学, 大学院・地球環境科学研究院, 准教授 (50373452)
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| Co-Investigator(Kenkyū-buntansha) |
SAITO Kazuyuki 独立法人海洋研究開発機構, 地球環境変動領域, 研究員 (70419133)
IWAHANA Go 北海道大学, 大学院・地球環境科学研究院, 特任助教 (70431327)
MATSUOKA Norikazu 筑波大学, 生命環境科学研究科, 教授 (10209512)
SUGIMOTO Atsuko 北海道大学, 大学院・地球環境科学研究院, 教授 (50235892)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 環境変動 / 永久凍土 |
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| Research Abstract |
This study aims to clarify thermal state of permafrost especially on Mongolia, Svalbard and Japanese high mountains under the umbrella of global permafrost network. In Mongolia we found occurrences of the colder permafrost on the northerner territories and large spatial differences in temperatures even within small areas. We deduced that permafrost warming is strongly controlled by the rate of unfrozen water contents. Recently the international permafrost association has paid special attention of Mongolian permafrost observatories, since number of research borehole has been significantly increased by our study. The deepest, 10m-permafrost-research-borehole among Japan has been installed on the permafrost, Daisetsu Mountains, Hokkaido. The low ground temperature, -2℃ at 10m, indicate the presence of thermally stable permafrost. The modeling schemes were improved especially for soil freezing and thawing processes in the GCM, and have been applied to reconstruct paleo-permafrost distribution. For verification we referred the distribution of fossil periglacial phenomena. The realistic verification needs for deeper understanding of concurrent relation between climate and periglacial processes. In this context we studied concurrent climatic situations for the frost wedge and frost creep, and paleo-permafrost development of pingo.
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[Presentation] Permafrost-snow-ecosystem in the late Quaternary climate : Distribution and interactions examined by global system modeling2011
Author(s)
Saito, K., S. Marchenko, D. Trombotto, N. Bigelow, V. Romanovsky, K. Yoshikawa, and J. Walsh
Organizer
WCRP Open Science Conference, Denver, CO, USA
Year and Date
20110000
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