A Study for Satellite Altimeter Absolute Calibration in Taiwan

• Main Authors: Si-Chi Wang, 王錫祺
• Other Authors: Kai-chien Cheng
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/28551113527509815961

碩士 === 國立中正大學 === 地震研究所暨應用地球物理研究所 === 96 === Satellite altimetry has become an efficient tool for data collection over oceans. However, there is a bias between the sea surface height (ssh) observation of satellite altimeters and the actual sea level. Hence, the ssh observation may not be directly adopted by the studies of global sea level rise with the magnitude of 1–2 mm/year without precise calibration. Absolute calibration of satellite altimetry requires the ssh to be measured by an independent tools, such as Global Positioning System (GPS) buoys and tide gauges. In this study, we analyzed groundtrack location and the satellite''s moving direction of JASON-1 altimeter and selected Anping, Tainan as the candidate site for calibration. A GPS buoy campaign near Anping has been conducted in order to catch the directly Ku overflight of JASON-1 space vehicle . The result of directly overflight show the bias is about 13.4 ± 5.6cm on July 23, 2007. The result of indirect overflight show the bias is about 14.1 ± 1.4cm. The value stands which with the global other stationary type calibration approaches. The following research may discuss ENVISAT, JASON-2 or continues the tide and the satellite altimetry material and the global mean sea level research and so on.