Preparing GPS vertical land displacements for use in a joint GPS/GRACE(-FO) solution
| Autor: | Peidou, A., Argus, D., Ellmer, M., Landerer, F., Wiese, D. |
|---|---|
| Rok vydání: | 2023 |
| Zdroj: | XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
| DOI: | 10.57757/iugg23-2146 |
| Popis: | Quantification of uncertainty in surface mass change signals derived from GPS measurements poses challenges, especially when dealing with large datasets with continental or global coverage. Our aim is to layout a processing scheme for GPS estimates of vertical land displacement (VLD), which will be used in a future joint solution with GRACE(-FO) observations. This scheme consists of a) corrections required to isolate surface mass variations from GPS signals; b) data screening applied to gauge the consistency between GPS and GRACE(-FO) and mark outlier stations or further corrections that may be needed; and c) uncertainty quantification of GPS VLD estimates, which will be used to assign weights to GPS estimates during the inversion process. We study the structure and quantify the uncertainty present in VLD estimates from 3045 GPS stations distributed across the continental US. Data screening involves a standard 3-sigma test, quantification of correlation and variance reduction and detailed study of the agreement in seasonal signals picked by each platform. For the uncertainty quantification, various processing schemes are tested, i.e., white, colored and common mode (spatially correlated) noise. All schemes show that noise ranges between 2-4 mm for >50% of the stations.© 2023. California Institute of Technology. Government sponsorship acknowledged. The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|