Temporal and spatial sea surface height variability in the North Sea - Baltic Sea system from altimetry, tide gauges, and 3D modelling
Madsen Kristine Skovgaard(1) and Jacob L. Høyer(2)
University of Copenhagen,
Juliane Maries Vej 30,
DK-2100 Copenhagen OE,
(2) Danish Meteorological Institute, Lyngbyvej 100, 2100 Copenhagen OE, Denmark
The water exchange between the North Sea and the Baltic is controlled by the Danish Straits, where the flow is governed by sea level differences and hydrological control. Due to coastal effects, it is challenging to use satellite altimetry in this area, but altimetry shows a large potential because of the basin wide data coverage.
In this study, the sea surface height of the North Sea - Baltic Sea system is analysed by the use of satellite altimetry and coastal water level recorders. In these near-coastal areas altimetry measurements from the TOPEX/POSEIDON and Jason satellites are obtained by careful selection of correction methods and a state of the art local geoid. By combining the two types of observations, high temporal and spatial resolution can be gained, and thereby dynamical processes in the North Sea - Baltic Sea system are revealed in new detail.
Regions with different characteristics are identified based on statistical analysis, and the benefits and challenges of satellite altimetry will be discussed for each region. A near-real time statistical water level model is set up for the area, and the performance is compared to the Danish Meteorological Institute storm surge model.