2007 Fiscal Year Final Research Report Summary
Study of gravity change induced by ice sheet change with satellite positioning and superconducting gravimeter
| Project/Area Number |
17540400
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | National Institute of Polar Research |
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Principal Investigator |
DOI Koichiro National Institute of Polar Research, Division for Research and Education, Associate Professor (80290873)
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| Project Period (FY) |
2005 – 2007
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| Keywords | ICESat laser altimeter / Superconducting gravimeter / Ice surface topographic height / Antarctic ice sheet mass change / Gravity residual / Syowa Station |
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| Research Abstract |
At first, gravity residual was obtained by extracting tidal signals, effect of atmospheric pressure change, effect of polar motion and instrumental drift from original data after 2003 through 2006 of superconducting gravimeter (SG) at Syowa Station, Antarctica.
In the processing, it was found that instrumental drift larger than 200 micro-Gal per year of SG CT#043 can be approximated by a decaying exponential function of first order. Effect of non-tidal change of ocean on gravity observation was also investigated.
On the other hand, measurement by laser altimeter which is equipped with a satellite ICESat started in February 2003, and we used GLAl2 product of release 28 observed at 11 acquisition periods until April 2007. We made Antarctic ice sheet topographies from altimetry data of the 11 acquisition periods and estimated temporal volume changes of ice sheet from the topographies of the 11 acquisition periods. The estimated volume changes were reduced to ice sheet mass changes by multiplying surface ice density obtained from in-situ measurements on Antarctic ice sheet.
Gravity changes at Syowa Station induced by Antarctic ice sheet mass changes can be calculated from temporal ice sheet mass changes over Antarctic continent. We calculated temporal gravity changes from the temporal mass changes over Antarctic continent estimated from the 11 acquisition periods data and compared the expected gravity changes caused by the ice sheet mass changes with the observed gravity residuals. Temporal changes of the observed gravity residuals did not so resemble the expected gravity changes in phasis and magnitude. The differences may be caused by estimation error in ice sheet heights of coastal region in the vicinity of Syowa Station. In the future, we intend to improve the way to estimate heights at grid points in sloping region such as coastal area of Antarctica.
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[Journal Article] Continuous gravity observation with the superconducting gravimeter CT#043 at Syowa Station, Antarctica2008
Author(s)
Doi, K., Shibuya, K., Ikeda, H., Fukuda, Y.
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Journal Title
Book on Geodesy and geophysics observations in polar regions, A. Capra, R. Dietrich(Eds.), JAG Symposia, Springer (in press)
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Loading and Gravitational Effects if the 2004 Indian Ocean Tsunami at Syowa Station, Antarctica2007
Author(s)
Nawa, K., Suda, N., Satake, K., Fujii, Y., Sato, T., Doi, K., Kanao, M., Shibuya, K.
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Journal Title
Bulletin of the Seismological Society of America 97, 1A
Pages: S271-S278
Description
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[Journal Article] Sea level and gravity variation after the 2004 Sumatra Earthquake observed at Syowa Station, Antarctica2006
Author(s)
Nawa, K., Satake, K., Suda, N., Doi, K., Shibuya, K., Sato, T.
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Journal Title
Dynamic Planet, P. Tregoning, C. Rizos(Eds.), JAG Symposia(Springre) 130
Pages: 536-540
Description
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[Presentation] Influence of sea level change on gravity observation with a superconducting gravimeter at Syowa Station, Antarctica2007
Author(s)
Doi, K., Aoyama, Y, Shibuya, K., Ikeda, H., Sakanaka, S.
Organizer
Japan Geoscience Union Meeting 2007
Place of Presentation
Chiba
Year and Date
20070519-24
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Influence of sea level changes on gravity observed by a superconducting gravimeter at Syowa Station, Antarctica2007
Author(s)
Doi, K., Shibuya, K., Aoyama, Y., Ikeda, H., Fukuda, Y
Organizer
First Asia workshop on superconducting gravimetry
Place of Presentation
Hsinchu, Taiwan
Year and Date
20070312-15
Description
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[Presentation] Comparison of GRACE data with a superconducting gravimeter data at Syowa Station, Antarctica2006
Author(s)
Doi, K., Aoyama, Y., Shibuya, K., Ikeda, H., Fukuda, Y., Yamamoto, K.
Organizer
AGU Fall Meeting 2006
Place of Presentation
San Francisco
Year and Date
20061211-15
Description
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[Presentation] The 2004 Indian Ocean tsunami observed with tide gauges, a gravimeter and seismometers at Syowa Station, Antarctica2005
Author(s)
K. Nawa, N. Suda, K. Doi, Y. Nogi, K. Shibuya, M. Kanao, H. Ikeda, T. Sato, K. Satake
Organizer
104th Meeting of the Geodetic Society of Japan
Place of Presentation
Kyoto
Year and Date
20051025-27
Description
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