Seite - 143 - in Contributions to GRACE Gravity Field Recovery - Improvements in Dynamic Orbit Integration, Stochastic Modelling of the Antenna Offset Correction, and Co-Estimation of Satellite Orientations

60°S 30°S 0° 30°N 60°N 180°W 90°W 0° 90°E 180°E (a) Old stochastic model. 1 (b) Using AOC covariance. (c) Difference AOC covariance - old model. 1 (d) TLS solution. (e) Difference TLS solution - old model. −20−15−10 −5 0 5 10 15 20 Equivalentwater height [cm] (a,b,d) −4 −2 0 2 4 Equivalentwater height [cm] (c,e) Figure 9.9: Equivalent water height maps for April 2008, a month of good data. The top and left column shows the monthly gravity field variations for the three computed solutions. The right column shows the difference of the improved solutions w.r.t. the reference solution. A 300km Gaussian filter was applied to the data. Note the different scale for (c), (e). 9.3 Results 143