Results and Products
Results of the first phase of the Research Unit are:
- Time averaged (static) uncertainty estimates for major ocean tides on global and regional scales for de-aliasing purposes (IP1)
- Time-averaged (static) uncertainty information for AOD1B products (IP2)
- High resolution short-term atmospheric and hydrological mass variations including error estimates to be used for de-aliasing and validation purposes (IP3)
- Realization of a European test bed for de-aliasing studies and validation of GRACE/GRACE-FO products based on European SG and GNSS data (IP3)
- Significantly improved GRACE and GRACE-FO gravity field models based on improved stochastic modeling and parametrization (exemplarily for 3 years) (IP4 and IP5)
- Cross-calibration GRACE and GRACE-FO (IP4)
- Optimized filter strategy for Level-2 GRACE and GRACE-FO products (IP6)
- Quantification of impact of improved processing strategies on Next Generation Gravity Missions (IP6)
Cooperation within and across IPs has been fostered through an extensive scheme of exchange of results and methods between the various scientists.
The following table summarizes the deliverables defined for the first phase and shows also the level of compliance after 28 months. Details on the IP-specific achievements and results are given at the individual IP pages. The final data products of the different phase 1 IPs will be made available in fall 2022.
| Del. | Content | Date | Target IP |
|---|---|---|---|
| D1.1 | Uncertainties of present-day ocean tide models | M12 | 4,5 |
| D1.2 | New estimates of ocean and load tides | M24 (draft), M36 (final) | 4,5 |
| D2.1 | Non-tidal atmosphere and ocean differences | M6 (draft), M12 (final) | 3,5 |
| D2.2 | Stationary variance-covariance for A+O coefficients | M24 (draft), M36 (final) | 4,5 |
| D2.3 | New AOD coefficients | M24 (draft), M36 (final) | 4,5 |
| D3.1 | Alternative AO+H coefficients, high resolution over Europe | M24 (A+H), M36 (final) | 4,5 |
| D3.2 | Ensemble of A+H coefficients for error representations | M24 | 4,5 |
| D3.3 | Error PSD and variance-covariance for A+H coefficients | M36 | P2: 4,5 |
| D3.4 | Validation over Europe | M24 (method), M36 (results) | 2,4,5 |
| D4.1 | Stochastic models and systematic instrument characterization for ACC, KBR and LRI | M6 | 5,6 |
| D4.2 | Recommendations for individual tidal, non-tidal and empirical parametrization in combination with stochastic modelling and application to real data | M18 | 5,6 |
| D4.3 | Baseline strategy for the treatment of background model errors | M18 | 1,2,3,5,6 |
| D4.4 | Recommendation regarding methodology for combined tidal, non-tidal and empirical parametrization in combination with stochastic modelling, as well as an impact analysis of individual and combined effects and quantification of improvements. | M32 (draft), M36 (final) | 1,2,3,5,6 |
| D4.5 | Temporal gravity field models for selected months | M32 (draft), M36 (final) | 1,2,3,5,6 |
| D5.1 | Dominant parameter and background model errors | M18 | 1,2,3,4,6 |
| D5.2 | Time-variable gravity from 3 years of GRACE/GRACE-FO real data with improved error estimates | M32 (draft), M36 (final) | 4,6 P2: 2,6 |
| D6.1 | Data set consisting of 3 years (2 for GRACE and 1 for GRACE-FO) of post-processed global gravity field models with realistic error estimates, including a report on the assessment and quantification of the filter effects. | M36 | P2: 2 |
| D6.2 | Report containing the evaluation and conclusive summary of results of Phase 1, an identification of research topics to be addressed in Phase 2, and recommendations to external entities. | M36 | P2: 2 |
| D6.3 | Report containing the main NGGM simulation results and the assessment of the impact of new methodological developments achieved in this RU. | M36 | P2: 2 |
Table 1: Deliverables agreed upon within the RU in the first phase. In the first column, the first digit of each ID indicates the IP responsible for generating the product. Target IP describes the IPs that are going to use those deliverables for subsequent investigations. P2 indicates that the deliverable is going to be used by given IPs in the second phase only. Already generated deliverables are marked in bold letters.