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Altimeter error budgets

This section discusses the various error budgets associated with altimeter measurements as outlined by Chelton et al. in "The Altimeter Book". It addresses key factors contributing to altimeter inaccuracies, including radar noise, orbital errors, and environmental corrections such as the wet and dry troposphere. The need for estimates of error variance and covariance is emphasized to better comprehend mean sea level trends and correlation structures. This synthesis aims to consolidate scattered information on altimeter errors and propose methodologies for further understanding and mitigating these error sources.

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Altimeter error budgets

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  1. Altimeter error budgets Chelton et al., from the “altimeter book”

  2. Spatially varying errors (a)TP-Jason (b) Dry troposphere (a)+(b) using significant wave height plus Chelton et al. table Ponte, Wunsch & Stammer (2007, J. Atmos. Oce. Tech.)

  3. What is needed • Basic errors/Jason+TP • radar noise • orbit error • environmental corrections (wet and dry troposphere, ionosphere, sea state bias,…) • models (tides, IB, high frequency correction) • Basic errors/other missions, combined products, etc. • Special topics • methodologies to get at errors • characterizations of spatial, temporal behavior • errors in time-mean, mean sea level trends,… • correlation structures • ...

  4. Charge to the group • Estimates of error variance and covariance are needed for most basic use of all altimeter products • Much information on errors is probably already there, but scattered among different splinter groups (orbit errors, radar noise, SSB, IB and dry tropospheric correction, …) • Need some focus and synthesis effort to summarize what we know and some thinking on how to get at some of the errors that we can not handle just yet

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