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Figure
Methodology:
For each grid point a time series of summer mean Chl-a concentration was calculated for the period 1998-2009, using the same definition of summer as in the observations. The trend in these time series are tested for significance using the Mann-Kendall test.
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Figure type:
This analysis is based on satellite observations of ocean colour which is equivalent to chl-a. A global dataset covering the period 1998-2009 and without regional corrections has been used. This dataset is most accurate in the Mediterranean Sea. In the Black Sea, few in-situ observations are available and the satellite imagery is unverified. In the Baltic Sea high concentrations of humic substances in the sea requires a regional correction of the satellite observations, making the analysis less certian in this area.
For references, please go to https://www.eea.europa.eu/data-and-maps/figures/statistically-significant-trends-of-ocean or scan the QR code.
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