Calibration of the Linear Drift of Mean Sea Level Change from Satellite Altimetry Using Tide Gauge Observations

The rate of sea level change is one of the important indicators to measure global climate change.To the question that linear drift may exist in the rate of mean sea level change determined by satellite altimetry data,the rapid global tide gauge observations are used as reference to calibrate the linear drift.First,the data pre-processing in high quality is done to ensure satellite altimetry and tide gauge observe as far as possible the same sea level signal in the same location and time.Then,the calibration method is modified to solve the problem that the difference of sea level change between satellite altimetry and tide gauge in each tide gauge can't by average in the global for different reference datum.Taking T/P satellite measurement for example,the above process and method are realized,and the drift of mean sea level change is achieved,which can provide a guarantee to obtain the true rate of mean sea level change.