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Earth Surface & Interior

We will conduct new and improved global inverse analyses of multiple and inter-disciplinary data sets to estimate present-day surface mass trend and glacial isostatic adjustment (GIA) simultaneously. The rotational feedback and gravitational self-consistent sea level mechanisms of GIA will be re-evaluated and implemented in the inverse algorithm. Their impacts on the degree-2 order-1 geoid and vertical spherical harmonic coefficients and sea level estimation will also be examined. Separating present-day surface mass trend and GIA and accurate estimation of long-wavelength spherical harmonic trends are critical for determination of large-area average variations such as non-steric mean sea-level rise. Our improved present-day surface mass trend and GIA estimates will also contribute to more accurate determinations of the global mean sea level rise by tide-gauges and altimeters. Using relative geodetic surface velocities in the data combination provides an accurate estimate of geocenter velocity independent of the direct geodetic geocenter determination. We will use this information for external validation of the International Terrestrial Reference Frame origin stability, which is crucial for altimetric and tide-gauge/GPS determinations of the mean sea level. The inverse approach not only provides a quantitative platform for statistical combination of data and a priori GIA models, but also facilitates rigorous assessment of various uncertainties and their propagation in the estimation process.

Project PI: Xiaoping Wu/Jet Propulsion Laboratory

Email: xiaoping.wu@jpl.nasa.gov

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Started: Sep 29, 2010

Last Activity: Jan 05, 2011

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