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5. Calibration Results of GFO

Author

Zhao, Changyin, Shum, C. K., Yi, Yuchan, Sansò, Fernando, editor, Hwang, Cheinway, editor, Shum, C. K., editor, and Li, Jiancheng, editor

Published
2004
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7. CYGNSS Ocean Altimetry: A Status Report

Author

Shum, C.K., Yi, Yuchan, Ding, Yihang, Zhang, Yu, Jia, Yuanyuan, Johnson, J., Xiao, Yixin, Li, Weiqiang, Cardellach, Estel, Ge, Maorong, Ge, Frank, Park, Jeonghwan, Wang, Xiaochun, and Kuo, Chungyen

Abstract

Comunicación expuesta online en el CYGNSS Science Team Summer Meeting celebrado del 27 al 29 de julio de 2021

Published
2021

9. Accuracy assessment of lunar topography models

Author

Fok, H. S., Shum, C. K., Yi, Yuchan, Araki, Hiroshi, Ping, Jinsong, Williams, James G., Fotopoulos, Georgia, Noda, Hirotomo, Goossens, Sander, Huang, Qian, Ishihara, Yoshiaki, Matsumoto, Koji, Oberst, Jürgen, and Sasaki, Sho

Published
2011
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25. Mean sea surface and geoid gradient comparisons with TOPEX altimeter data

Author

Rapp, Richard H, Yi, Yuchan, and Wang, Yan Ming

Subjects
Oceanography
Abstract

Cycles 4 to 54 of TOPEX data have been analyzed through comparisons with the mean sea surface given on the disturbed geophysical data record (GDR). Two inverted barometer correction procedures were considered for the data reduction. One used a constant atmospheric pressure for all data while the one adopted for use, for most computations, introduced a cycle average pressure. The maximum difference between the two estimates was 3.0 cm with a clear annual signal. With the modified correction the TOPEX sea surface was compared to The Ohio State University (OSU) mean sea surface, given on the GDR, to estimate three translations ( delta x = -2.3 cm; delta y = 25.0 cm; delta z = -0.3 cm) and a bias (43.3 cm) between the two surfaces. The only significant translation is delta y which indicates the reference frame of the TOPEX system differs from that used in the OSU mean sea surface system. The bias between the TOPEX mean sea surface and the OSU mean sea surface was used to estimate an equatorial radius of 6,378,136.55 m based on an 18-cm biased estimate of the TOPEX altimeter. Examination of the average difference, by cycle, between the TOPEX sea surface and the OSU mean sea surface suggested a bias change of 3.1 +/- 2.2 mm/yr with a positive sign indicating the average ocean surface is rising or the altimeter measured distance is decreasing. Models were implemented that solved directly for a bias, bias rate annual/semiannual, and tide correction terms. The computations indicated that a simultaneous solution for this bias, bias rate, and annual/semiannual terms gave the most accurate results. Nonsimultaneous solutions led to slightly different bias rate values. The root mean square difference between the TOPEX sea surface and OSU sea surface, after translation and bias correction, was +/- 17 cm for a typical cycle. Some locations were indentified where the difference could reach 2.3 cm and were repeated over several cycles indicating errors in the mean sea surface. Most of the large differences occur in regions lacking altimeter data prior to the TOPEX/POSEIDON mission and/or areas of significant bathymetric signature. Geoid gradients are needed for the reduction of individual track data to a reference track. The accuracy of the determination of such gradients was determined through the comparison of predicted along-track gradients to the observed gradients. Among four mean sea surfaces tested the best agreement was found with the OSU mean sea surface placed on the TOPEX geophysical data record.

Published
1994
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30. Characterization of Active Layer Thickening Rate over the Northern Qinghai-Tibetan Plateau Permafrost Region Using ALOS Interferometric Synthetic Aperture Radar Data, 2007–2009

Author

Jia, Yuanyuan, primary, Kim, Jin-Woo, additional, Shum, C., additional, Lu, Zhong, additional, Ding, Xiaoli, additional, Zhang, Lei, additional, Erkan, Kamil, additional, Kuo, Chung-Yen, additional, Shang, Kun, additional, Tseng, Kuo-Hsin, additional, and Yi, Yuchan, additional

Published
2017
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34. Modeling tides and their influence on the circulation in Prince William Sound, Alaska

Author

Wang, Xiaochun, primary, Chao, Yi, additional, Zhang, Hongchun, additional, Farrara, John, additional, Li, Zhijin, additional, Jin, Xin, additional, Park, Kyungeen, additional, Colas, Francois, additional, McWilliams, James C., additional, Paternostro, Chris, additional, Shum, C.K., additional, Yi, Yuchan, additional, Schoch, Carl, additional, and Olsson, Peter, additional

Published
2013
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44. Application of retracked satellite altimetry for inland hydrologic studies

Author

Zhang, Manman, primary, Lee, Hyongki, additional, SHUM, C. K., additional, Alsdorf, Doug, additional, Schwartz, Frank, additional, Tseng, Kuo-Hsin, additional, Yi, Yuchan, additional, Kuo, Chung-Yen, additional, Tseng, Hong-Zeng, additional, Braun, Alexander, additional, Calmant, Stéphane, additional, Filizola, Naziano, additional, and Seyler, Frederique, additional

Published
2010
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