Towards further improving DTU global ocean tide model in shallow waters and Polar Seas
Event: 2017 Ocean Surface Topography Science Team Meeting
Session: Tides, internal tides and high-frequency processes
Presentation type: Type Poster
Motivated by the widely applications of the empirical global ocean tide model DTU10 (1/8°×1/8°) to real world, particularly in shallow waters and Arctic Ocean, an updated model DTU16 representing all major diurnal and semidiurnal tidal constituents was developed based on FES2012 model with residual tides calculated using response analysis method. The spatial resolution of the DTU tide model was promoted to 1/16°×1/16°. All available TOPEX, Jason-1, OSTM/Jason-2 (Ocean Surface Topography Mission) primary (data up to June 2016) and tandem missions were used to develop the new model. To decrease the discrepancies between model and in-situ measurements estimated S2 tide constituent, the ERA-Interim model was selected for altimetry data dry tropospheric correction. The updated global ocean tide model was assessed and inter-compared with existing state-of-the-art global ocean tide modes against 10 tide gauge data sets in deep water, coastal regions, shelf water and marginal seas. The new model presented the lowest Root Mean Square in shallow waters (e.g., European Shelf, particularly for S2 tide) and coast regions (e.g., East Asian Marginal Seas). In the Arctic Ocean, Compared with DTU10, further improvements were achieved by adding ERS-1 and introducing new altimetric data from Saral/Altika.