Oxygen saturation trends in the Baltic Sea |
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Authors: | Lars Rahm Lotta Sturesson Åsa Danielsson Per Sandén |
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Institution: | 1. Environmental Botany Laboratory, National Botanical Research Institute, 226 001, Lucknow, India
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Abstract: | Marine monitoring programmes are seldom planned and realized to fulfil the requirements of the statistical methods used. The
shortcomings of these methods are rarely discussed in the literature. In this work two different methods for trend analysis
are applied to a real case and attention is given to the possible violation of the underlying assumptions. Long-term changes
in oxygen supersaturation in the Baltic Sea are the object of the study. Linear regression and non-parametric methods are
those chosen. The linear regression gave significantly increasing trends of oxygen saturation in Arkona, Eastern Gotland basin
and in the Bothnian Sea, but the tested assumptions turned out to be violated. The corresponding non-parametric trend test
only confirmed the increasing trend in Arkona. It is suggested that non-parametric methods, like the one used in this work,
should be favoured in the future for similar types of marine environmental data. |
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