SEa Level Variability due to Melt water Fingerprints and in Regional, COstal and In-LAnd Regimes FICOSELA
- (Technische Universität Darmstadt)
Through combination of sea level and mass change observations and model simulations an under- standing of mass transport and mass distribution shall be achieved at regional and global scales. The construction of a regional harmonized multi-mission altimeter dataset is a key point for both high reso- lution sea level change analysis and assimilation of altimeter data in the regional ocean models. Envi- ronmental corrections for altimetry and GRACE data are assessed and homogenized for the compari- son of gravimetric and altimetric signals.
New with respect to the previous project within OSTST (STREMP-OSTST "Spatial and Temporal Resolution Limits for RegionalMassTransport and Mass Distribution" NRA ROSES-2007 NNH07ZDA001N CNES DSP/OT7-4571) are (1) the extension of the analysis on land using both altimetry and GRACE data and (2) the "fingerprint" aproach.
In the analysis at regional scale, focus is on coastal processes and land-ocean exchange. High- resolution altimetric data (Jason-1, TOPEX/Poseidon, ERS1/2, Envisat, Geosat, GFO) and dedicated re-tracking improve the data availability near to coast and in lake and rivers.
Regionally a state of the art ocean general circulation model with a high spatial resolution and realistic forcing is applied to the Mediterranean-Black Sea region and run both with and without assimilation of altimeter data. It simulates steric and salinity contributions, flow and water mass characteristics and aims at an improved understanding of the basic physical controls.
Steric- and mass-induced sea level change at low and high frequency variation of the coastal sea sur- face topography are investigated. The investigation combines satellite gravity data and altimeter data and thus improves the understanding of the mean ocean circulation. The joint assessment of mass changes brings the various (gravimetric, altimetric, oceanographic and land-hydrologic) components together to derive the mass balance and the mass exchange for the whole area.
The project shall quantify the importance of using altimetry, GRACE and GOCE data to identify the contributors to sea level trends and variability. Fingerprints due to melt water in ocean and due to in land are considered in selected regional, costal and in-land regimes.
Anticipated results are :