measurements are still performed
with newer instruments today, making it the worlds longest sea level data series (SMHI, 2018b).
Today, The Swedish Meteorological and Hydrological Institude (SMHI) runs a network of 24 tide
gauges that measure sea level averaged over 10 minute periods in a relative elevation system. The
data is gathered every hour and presented online2 within
30 minutes, relative
/media/vedurstofan-utgafa-2020/VI_2020_005.pdf