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Abstract:
The Topex/Poseidon, Jason 1-3 and Sentinel-6 Michael Freilich radar altimeter missions provide a continuous record of sea level from 1992 until the present day. An intermission bias is calculated during the tandem/calibration phase for each subsequent mission to tie it to the global mean sea level of the previous mission. These intermission biases are then applied to measurements from the missions to estimate both global and regional sea level trends. However, in the case of regional trends, the intermission bias often does not match the regional bias, which then influences regional sea level trend estimates. This investigation seeks to improve estimates of regional sea level trends by introducing a gridded intermission bias, and attempting to reduce regional differences between satellites by maintaining a consistent sea state bias modeling method. We will discuss how properly accounting for regional biases in the measurements influences estimates of regional sea level trends over the last 30 years.
