Project overview & geodetic mass estimation

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1 Direct Water Balance 1 Project overview & geodetic mass estimation Nico Sneeuw, Balaji Devaraju Geodätisches Institut, Universität Stuttgart Johannes Riegger, Henry Kindt, András Bárdossy Institut für Wasserbau, Universität Stuttgart Harald Kunstmann, Benjamin Fersch Institut für Meteorologie und Klimaforschung (IMK-IFU) Karlsruhe Institute of Technology (KIT), Forschungszentrum Karlsruhe DFG SPP1257 Kolloquium Oktober 2008 München

2 project overview

3 The global continental water balance using GRACE spaceborne gravimetry and high-resolution consistent geodetichydrometeorological data analysis direct water balance DWB

4 assessing storage change hydrology P R ET a = S t H Φ1: evaluation Φ2: calibration Φ3: application M t geodesy S t A = Q R hydro-meteorology

5 flowchart phase 1: evaluation

6 geodetic progress

7 Geodetic activities data management agencies releases months filter bank development design implementation testing geodetic mass estimation & error assesment development of further tools full error VC-matrix handling & propagation sequential adjustment with hydrological constraints (proof of concept for phase 2)

8 GRACE spectra and filter bank filter bank isotropic vs. anisotropic destriping non-stochastic vs. stochastic error VC-matrix: full vs. block vs. diagonal dimensionless monthly signal degree variances average signal power law signal monthly noise l = 25

9 example: isotropic filtering Mass deviation estimates [mm] from GRACE data (GFZ R4, February 2003) after isotropic filtering

10 example: anisotropic filtering Mass deviation estimates [mm] after anisotropic filtering (Han et al., 2005) Mass deviation estimates [mm] after destriping and isotropic filtering

11 size matters: Aravalli and Ob basins time domain space domain (February 2003) 1) none 2) box-car 3) Gauss 400 km 4) + destriping 5) anistropic Gauss 6) isotropic Wiener

12 achievements DWB/geodesy geodetic storage change estimation error assesment filter bank full error VC-matrix handling propagation sequential adjustment with hydrological constraints (proof of concept for phase 2)

13 moreover,...

14 Output phase 1 (so far) Presentations Devaraju B, Sneeuw N (2007) Stochastic averaging of GRACE data. Geodätische Woche 2007, Poster presentation, DVW, Leipzig, Germany. Devaraju B, Sneeuw N, Kindt H, Riegger J, Lorenz C (2008) Constraining monthly GRACEsolutions with hydrological mass estimates. Geophysical Research Abstracts, vol. 10, pp. EGU2008 A , EGU General Assembly 2008, Wien, Austria. Devaraju B, Sneeuw N (2008) Impact of filtering on the spatial covariance structure of GRACE. Geodätische Woche 2008, DVW, Bremen, Germany. Devaraju B, Sneeuw N, Kindt H, Riegger J (2008) Estimating GRACE monthly water storage change consistent with hydrology by assimilating hydrological information, Poster presentation, IAG symposium Gravity, Geoid and Earth Observation, June 2008, Chania, Greece Fersch B, Kunstmann H, Bárdossy A (2008) Regional atmospheric mass and moisture flux modelling and comparison to GRACE signals. Geophysical Research Abstracts, vol. 10, pp. EGU2008 A , EGU General Assembly 2008, Wien, Austria. Kindt H, Riegger J, Bárdossy A, Devaraju B, Sneeuw N (2008) Evaluation of GRACE Measurements with Hydrologic Data. Geophysical Research Abstracts, vol. 10, pp. EGU2008 A , EGU General Assembly 2008, Wien, Austria. Riegger J, Kindt H, Bárdossy A, Sneeuw N, Devaraju B (2008) Möglichkeiten zur Charakterisierung von großskaligen Grundwasserresourcen durch Satelliten-Gravimetrie. FH-DGG Konferenz 2008, Göttingen, Germany. Sneeuw N, Riegger J, Kunstmann H, Bárdossy A, Keller W, Devaraju B, Kindt H, Fersch B, Weigelt M, Antoni M (2007) An interdisciplinary approach towards the determination of large scale actual evapotranspiration and the evaluation of atmospheric moisture flux. Joint International GRACE Science Team Meeting and DFG- SPP 1257 Symposium, GFZ Potsdam, Germany. Publications Devaraju B, Sneeuw N, Kindt H, Riegger J (2008) Estimating GRACE monthly water storage change consistent with hydrology by assimilating hydrological information, in: Proceedings of IAG symposium Gravity, Geoid and Earth Observation, June 2008, Chania, Greece, under review

15 flowchart phase 2: calibration more on poster

16 hydro-meteo

17 Outlook remainder Phase 1 1. Addition of catchment specific and stochastic decorrelation filters as outlined in Swenson & Wahr (2002); Kusche (2007), respectively, to the filter bank. 2. Development of sophisticated stochastic filters based on the simulated error-covariance matrices. 3. Completion of the implementation of fast algorithms for error propagation from spectral domain to the spatial domain. 4. Analysis of the influence of the use of diagonal, block-diagonal and complete stochastic matrices for calculating error-bounds of mass estimates and in stochastic filtering of GRACE data. 5. Analysis of the correlations between different hydrologic catchments purely from GRACE data, and the influence of areaweighted averaging on the correlation structure

18 isotropic filters

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