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Conference Paper

Assessing regional biases in satellite radar altimeter missions for monitoring Long-term sea level change

Authors

Putnam,  Alexa
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Nerem,  R. Steven
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Putnam, A., Nerem, R. S. (2023): Assessing regional biases in satellite radar altimeter missions for monitoring Long-term sea level change, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4621


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021031
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.