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초록
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한반도와 동해를 포함하는 지역적인 지오이드를 세밀화하는 과정을 설명하고, 계산 결과를 제시하였다. 지오이드의 높이와 해수면의 높이의 비교와 최종적인 세밀화의 결과를 해석하고 제시하였다. 세밀화된 지역적인 해양 지오이드는 이전에 보고된 것과 비교하여 더 나은 해상도를 가지며 해저수심과의 상관성을 갖는다. 산정된 지오이드의 일반적인 패턴은 기존의 연구와 잘 일치하며, 동해에서의 세밀화된 해양 지오이드와 수심과의 상관관계는 (1) $117^{\circ}E{\sim}142.5^{\circ}E/24^{\circ}N{\sim}52^{\circ}N$의 영역에서는 0.44, (2) $127^{\circ}E{\sim}142.5^{\circ}E/32^{\circ}N{\sim}50^{\circ}N$의 영역에서는 0.47이다.

Abstract AI-Helper 아이콘AI-Helper

Procedures involved in the refinement of the regional geoid for the area encompassing the Korean peninsula and the East Sea are described, and the computational results are provided. A comparison between the geoid height data, the mean sea surface height and the final product of the refinement work ...

주제어

AI 본문요약
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제안 방법

  • Taking all these factors into consideration, a detailed local marine geoid profile was calculated utilizing the EGM96 geopotential model as the basis of the long-wavelength contributor. This specific geopotential model was selected as the basis for computing the overall structure of the geoid profile because of the characteristics of its data structure.
  • The main purpose of this study was to determine the optimum geoid that could serve as the ‘geophysical surface correction’ in computing the residual sea surface height variabilities, from which to delineate the oceanic current, and its circulation patterns in the East Sea.
  • Thus in altimetric oceanography, where the accuracy of the current measurements depends on the known measurements of the oceanic geoid; to obtain ocean-dynamics information from the sea surface height measurements, the surface height and slope relative to the geoid need to be identified with sufficient accuracy. Therefore, in-depth information on the marine geoid profile, prior to subsequent data processing, is required in order to extract dynamically relevant oceanographic signals from the measurements.
  • By computing the best marine geoid profile, we can also determine the oceanic conditions of the East Sea. Thus the main focus of the study involved refining the marine geoid profile provided with the altimetric datasets; the TOPEX/Poseidon MGDR.

대상 데이터

  • Dataset (A) is provided by the JPL PODAAC (Physical Oceanography Distributed Active Archive Center) on CDs; dataset (B) was downloaded from Sandwell’s ftp site (ver. 7.2); and dataset (C) was collected at Sungkyunkwan University.
  • In this study, observed terrestrial gravity values were used at 2750 points (Fig. 2) scattered around the southern region of the Korean peninsula. These values were measured by the National Geographic Information Institute of Korea and by Pusan National University (Choi and Kim, 1993).
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참고문헌 (27)

  1. Adjaout, A. and Sarrailh, M. (1997). A new gravity map, a new marine geoid around Japan and the detection of the Kuroshio current. J. Geodesy, 71, 725-735 

  2. Benada, R. (1993). Merged GDR (TOPEX/POSEIDON) USERS HANDBOOK, Version 1.0. PODAAC, JPL 

  3. Brenner, A.C., Koblinsky C.J. and Beckley B.D. (1990). A preliminary estimate of geoid-induced variations in repeat orbit satellite altimeter observations. J. Geophys. Res., 95(c3),3033-3040 

  4. Cho, K.J., Lee, Y.J. and Cho, B.W. (1994). Improved GRS80 gravimetric geoid in the South Korea region (KGM93). J.Korean Soc. Geod., Photogram. And Cartogr., 12(1), 61-68.(in Korean with English abstract) 

  5. Choi, B.H., Kim, K.O. and Eum, H.M. (2002). Digital bathymetry and topographic data for neighboring seas of Korea. J.Korean Soc. Coastal and Ocean Engineers, 14(1), 41-40.(in Korean with English abstract) 

  6. Choi, K.S. (1991). Astudy on the Geoid in and around the Korean Peninsula by analysing OSU89B. J. Korean Soc.Geod., Photogram. and Cartogr., 9(2), 67-72. (in Korean with English abstract) 

  7. Choi, K.S. (2005). Study on the determination of the precise geoid model. Technical Report of the Korea Sea Grant Program,MOMAF, Korea, 108p, (in Korean with Englishabstract) 

  8. Choi, K.S. and Kim, J.H. (1993). Detailed geoid in and around the Cheju Island. J. Korean Earth Sci. Soc., 14, 219-224. (in Korean with English abstract) 

  9. Choi, K.S., Yang, C.S. and Park, S.M. (1994). On the Geoid in and around the Korean Peninsula by analysing Gravity Data. J. Korean Soc. Geod., Photogram. And Cartogr., 12(1), 131-139. (in Korean with English abstract) 

  10. Fukuda, Y. (1995). Precise determination of a geoid in and around Japan. J. Geodet. Soc. Jpn, 41, 1-16. (in Japanese with English abstract) 

  11. Hwang, C. (1996). A study on the Kuroshio's seasonal variabilities using an altimetric-gravimetric geoid and TOPEX/ Poseidon altimeter data. J. Geophys. Res., 101, 6313-6335 

  12. Kim, K.B., Choi, J.H., Yun, H.S. and Lee, S.B. (1995). Determination of the gravity anomaly in the ocean area of Korean peninsula using satellite altimeter data. J. Korean Soc. Geod., Photogram. and Cartogr., 13, 177-185. (in Korean with English abstract) 

  13. Kuroishi, Y. (1995). Precise gravimetric determination of geoid in the vicinity of Japan. Bull., Geogr. Surv. Inst. Japan, 41.,1-93 

  14. Kuroishi, Y. (2001). A new geoid model for Japan, JGEOID2000. In MG Sideris (Ed.) International Association of Geodesy Symposia 123, Gravity, Geoid, and Geodynamics 2000, Springer, 329-333 

  15. Lee, S.B. (2000). A Study on the Geoid Modeling by Gravimetric Methods and Methods of Satellite Geodesy. J. Korean Soc. Geod., Photogram. And Cartogr., 18(4), 359-367. (in Korean with English abstract) 

  16. Lee, S.B. and Choi, J.H. (1997). Geoidal heihgts analysis in and around Korean peninsula using EGM96 and OSU91A geopotential model. J. Korean Soc. Geod., Photogram. And Cartogr., 15, 131-139. (in Korean with English abstract) 

  17. Lee, S.B, Yun, H.S. and Choi, J.H. (1996). Gravimetric Geoid Determination by Fast Fourier Transform in and Around Korean Peninsula. J. Korean Soc. Geod., Photogram. And Cartogr., 14(1), 49-58. (in Korean with English abstract) 

  18. Lee, S.B, Hwang, Y.J. and Lee, J.W. (2004). Calaulation of Geometric Geoidal Heights Using Gps/leveling Data in Study Area. J. Korean Soc. Geod., Photogram. And Cartogr., 22(1), 45-52. (in Korean with English abstract) 

  19. Lee, Y.J. (1995). Geoid models referred to the Bessel ellipsoid of South Korea. J. Korean Soc. Geod., Photogram. And Cartogr., 13, 125-133. (in Korean with English abstract) 

  20. Marchenko, A., Kuehtriber, N. and Rautz, K. (1996). News and test results from the preliminary model EGM-X01. Spec. Work. Group on the GSFC/DMA Model Evaluation, Internl. Geoid Service 

  21. Roemich, D. and Wunsch, C. (1982). On combing satellite altimetry with hydrographic data. J. Mar. Res., 40, 605-619. 

  22. Sandwell, D.T. (1992). Antarctic marine gravity field from high-density satellite altimetry. Geophys. J. Int., 109, 437-448 

  23. Yun, H.S. (1995). Results of the geoid computation for Korean peninsula. Ph. D. Diss., Tech. Univ. Budapest, Budapest, Hungary, 156p 

  24. Yun, H.S. (1998). Fast Hartley transform technique as a efficient tools for gravity field modelling. J. Korean Soc. Geod. Photogram. And Cartogr., 16, 17-26 

  25. Yun, H.S. (1999). Precision geoid determination by spherical FFT in and around the Korean peninsula. Earth Planets Space, 51, 13-18 

  26. Yun, H.S. and Adam, J. (1994). The global geopotential models in the region of Korean peninsula. J. Korean Soc. Geod., Photogram. And Cartogr., 12(1), 95-106 

  27. Yun, H.S. and Lee, D.H. (2005). Accuracy Improvement of GPS/Levelling using Least Square Collocation. J. Korean Soc. Geod., Photogram. And Cartogr., 23(4), 385-392. (in Korean with English abstract) 

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