| Project/Area Number |
16310015
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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 | National Institute of Polar Research |
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Principal Investigator |
SHIBUYA Kazou National Institute of Polar Research, Division for Research and Education, Professor, 研究教育系, 教授 (80132710)
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| Co-Investigator(Kenkyū-buntansha) |
TANIGUCHI Makoto Research Institute for Humanity and Nature, Associate Professor, 助教授 (80227222)
AOKI Shigeru Hokkaido University, Institute of Low Temperature Science, Associate Professor, 低温科学研究所, 助教授 (80281583)
FUKUDA Yoichi Kyoto University, Graduate School of Science, Associate Professor, 大学院・理学研究科, 助教授 (30133854)
藤本 博巳 東北大学, 大学院・理学研究科, 教授 (50107455)
石川 尚人 京都大学, 大学院・人間環境学研究科, 助教授 (30202964)
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥15,800,000 (Direct Cost: ¥15,800,000)
Fiscal Year 2006: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2005: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 2004: ¥11,000,000 (Direct Cost: ¥11,000,000)
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| Keywords | GRACE satellite / validation / Antarctica / VLBI / GPS / precise gravimetry / OBP / seepage meter |
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| Research Abstract |
Our research aims at detecting gravity variations related with atmosphere-ocean-ice sheet change in the Antarctic region, and interpreting GRACE-satellite derived gravity variations together with the ground-truth geodetic validation data. From the analysis of 1999-2003 VLBI epoch campaign data, crustal uplift rate at Syowa Station was estimated as 4.6±2.2 mm/yr (Fukuzaki et al., 2005). This value is close to the DORIS result of 3.6±0.2 mm/yr by Amalvict et al. (2007), but is somewhat larger than the GPS result (1.4±0.2 mm/yr ; Ohzono et al., 2006) observed in the outcrop area of Lutzow-Holm Bay. The repeated absolute gravity measurements at Syowa Station revealed gravity decrease of-0.27 μGal/yr (Fukuda et al., 2006), and these space geodesy and precise gravimetry data are key factors to constrain glacial isostatic adjustment model as indicated by Makinen et al. (2007). Konishi et al. (2007) treated 17 years' onboard Shirase ship-gravimeter data with a unified drift correction model, and the obtained gravity anomalies will be used to improve static regional gravity field by joint Japan-Germany airborne geophysics surveys. This in turn will give us more precise and detailed dynamic gravity variations. As for new devices, OBPs deployed at (66°51'S, 37°49'E, 4600m sea depth) recorded sea-level change associated with the tsunami from the 2004 December 26 Sumatra Earthquake, and its loading effect to the SG and the STS was estimated by Nawa et al. (2007). It was shown that the residual OBP sea-level amplitudes after subtraction of tidal constituents have variations which are in phase with the GRACE monthly gravity variations. The seepage meter installed at the sea bottom of 800m in Lutzow-Holm Bay by JARE-46 recorded the value of 10^<-8> to 10^<-6> m/s, indicating the value of similar magnitude obtained in mid-latitudes. These two devices showed effectiveness of applicability in understanding water mass variations in the Antarctic region.
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