Comparison Between Baltic Sea Surface Heights Interpolated from Tide Gauge Measurements and Modelled Baltic Sea Surface Heights

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http://urn.fi/URN:NBN:fi:hulib-201904231721
Title: Comparison Between Baltic Sea Surface Heights Interpolated from Tide Gauge Measurements and Modelled Baltic Sea Surface Heights
Author: Särkikoski, Sanna
Contributor: University of Helsinki, Faculty of Science
Publisher: Helsingin yliopisto
Date: 2019
Language: eng
URI: http://urn.fi/URN:NBN:fi:hulib-201904231721
http://hdl.handle.net/10138/301128
Thesis level: master's thesis
Discipline: Geofysiikka
Abstract: The idea for this study was to unify the heights systems in the tide gauge data available from freely available sources and to make a surface interpolation of the Baltic Sea surface heights. There were some data availability problems in the south-east coast of the Baltic Proper which lead us to limit the study area to the northern Baltic Sea. We compared the surface interpolation made for the years 2007–2016 with the NEMO-Nordic reanalysis product sea levels in order to determine if the interpolated surface could be a used as an approximation of the sea surface heights in the Baltic Sea. Correlation between the interpolated surface and the model were 0.59–0.77 depending on the location. The model sea levels had a sudden change in the overall sea levels in mid-winter 2013–2014 and also a different trend before and after this jump. We also calculated correlations separately for each year from 2007 to 2016 for three mid-basin points. The correlations were between 0.91–0.98. We found the interpolation to be quite susceptible to errors and missing measurements, which makes it difficult to create the surface interpolation for the southern Baltic Proper with the current data availability problems. Therefore, other methods are needed in order to approximate sea levels in that area.


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