Implementation of GRACE and GRACE-FO observation covariance estimates at JPL
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, United States of America (matthias.ellmer@jpl.nasa.gov)
Developing meaningful uncertainty quantifications for GRACE or GRACE-FO derived products, e.g. water storage anomalies, requires a robust understanding of the information and noise content in the observables employed in their estimation.
The stochastic models for GRACE and GRACE-FO K-Band, and GPS carrier phase and pseudorange observables employed in upcoming JPL solutions will be presented. Within these models, the time-domain correlations for each of the observations are estimated, and then applied in the least squares estimate of monthly gravity field solutions. Reproducing results from other groups, the resulting formal errors of monthly solutions are improved.
We compare this approach to the current state of the art at JPL, and show that noise content in the determined gravity field solutions is reduced. We further demonstrate the application of this method to data from the GRACE-FO Laser ranging interferometer.
How to cite: Ellmer, M., Wiese, D., McCullough, C., Yuan, D.-N., and Fahnestock, E.: Implementation of GRACE and GRACE-FO observation covariance estimates at JPL, GRACE/GRACE-FO Science Team Meeting 2020, online, 27 October–29 Oct 2020, GSTM2020-31, https://doi.org/10.5194/gstm2020-31, 2020
