卫星测高逆气压改正及其对海平面变化的影响

基金项目: 国家教育部新世纪优秀人才计划资助项目(NCET-07-0633)；国家自然科学基金资助项目(40637034,40704004,40804003)；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(08-02-06)

详细信息

Inverse Barometer Correction in Satellite Altimetry and Its Effect on Mean Sea Level Change

¹School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan 430079, China;(2 Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan Unversity, 129 Luoyu Road, Wuhan 430079, China

Funds: 国家教育部新世纪优秀人才计划资助项目(NCET-07-0633)；国家自然科学基金资助项目(40637034,40704004,40804003)；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(08-02-06)

摘要: 研究了全球平均大气压的变化特征,分析了传统卫星测高逆气压改正存在的缺陷,并对以常数大气压为参考值、以全球海洋平均大气压为参考值和顾及高频信号的3种逆气压改正进行了对比。根据T/P卫星测高数据对3种改正方法得到的海面高和海平面变化进行了比较分析,相比于前两种逆气压改正,顾及高频信号的逆气压改正最接近海平面的真实响应,可减少卫星测高海面高交叉点不符值RMS约5.70mm,分别提高海平面变化估计精度约18%和12%。
- 卫星测高 /
- 大气压 /
- 逆气压改正 /
- 海平面变化
Abstract: We study the characteristic of global mean atmosphere pressure, and point out the shortcoming of traditional inverse barometer (IB) correction of satellite altimetry. Then, three kinds of inverse barometer corrections are compared in detail based on T/P altimeter data. Compared to the constant referenced IB and global mean value referenced IB, the DAC model based IB correction which high frequency signal is considered shows best, which can reduce the RMS of crossover difference 5.70 mm, and improve the fitting mean square error in sea level change 18% and 12% relative to the constant referenced IB corrected SSH and global mean value referenced IB corrected one, respectively.
- satellite altimetry /
- atmosphere pressure /
- inverse barometer correction /
- sea level change