Abstract
The European Space Agency's (ESA) remote‐sensing satellite, ERS‐1, launched in 1991, is the first in a series of satellite altimeters that should provide uninterrupted global coverage of sea level throughout the 1990s. We have analyzed these new data, together with Geosat data from the 1980s, to derive time series of sea level throughout the tropical Pacific. While altimeter observations are unique in their ability to provide sea‐level descriptions that are both large‐scale and detailed, these data suffer from a variety of errors. Currently, the biggest source of error for ERS‐1 is uncertainty in the satellite orbit at wavelengths corresponding to one revolution around the Earth. Conversion of ERS‐1 data into sea‐level deviations requires that this error be removed by some form of long‐arc adjustment.
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