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机构地区:[1]大连舰艇学院海洋与测绘科学系,大连市解放路667号116018 [2]武汉大学测绘学院,武汉市珞喻路129号430079
出 处:《武汉大学学报(信息科学版)》2006年第7期599-602,共4页Geomatics and Information Science of Wuhan University
基 金:武汉大学地球空间环境与大地测量教育部重点实验室开放研究基金资助项目(03-04-06;1469990324233-04-03);国家测绘局测绘科技发展基金资助项目(2001-01-02)
摘 要:定量分析了逆气压改正对各主分潮潮汐参数反演的影响。结果表明,逆气压改正对Sa的反演结果影响最大,在Sa的实际振幅中,气压变化的平均贡献比率为42%,气压变化使Sa的迟角减小了约27°,而对其他主分潮的影响可忽略不计。建议在应用卫星测高数据时,不加逆气压改正,但在数据处理时,需加Sa分潮的改正。The contribution of the IB correction to the annual constituent Sa and other principal tides is evaluated. When the IB correction is applied with the MGDR or calculated with an average pressure for each cycle, the discrepancy both are large, and the difference between them is small. But if IB correction is not added to the altimeter ranges, the discrepancy is almost reduced. Through comparing the difference of harmonic constant of Sa, the average contribution of seasonal air pressure variation in amplitude of Sa is about 42 %, and the seasonal air pressure variation causes the phase lag of Sa decreasing 27°. So IB correction should not be added to the altimeter range, and the tide model of Sa is essential to the annual variation to be removed. Therefore an Sa model covering China sea is established.
分 类 号:P228.3[天文地球—大地测量学与测量工程] P229.2[天文地球—测绘科学与技术]
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