Lake level changes in the Caspian Sea monitored by satellite altimetry and gravimetry
Event: 2016 Ocean Surface Topography Science Team Meeting
Session: Science III: Two decades of continental water's survey from satellite altimetry - From nadir low-resolution mode to SAR altimetry, new perspectives for hydrology
Presentation type: Type Oral
Changes of the water amount in the Caspian Sea can also be monitored by gravimetric measurements from the GRACE satellites. Time series of equivalent water heights of the Caspian Sea originating from 5 different processing centers were retrieved from the EGSIEM – Plotter (plot.egsiem.eu) and, in addition, from the JPL-mascon solution. While the annual signal of the altimetric and gravimetric data are very close to each other, the trends from 2005 onwards of the equivalent water heights and the sea level from altimetry disagree. Depending on the solution the gravimetric trends account only for 75-50% of the altimetric trends. The reasons for the discrepancies between the two data sources are further investigated.