Seili-index

The visualization of Seili-index describes the present chlorophyll-α concentration (chl-a; µg/l) in surface seawater and predicts its changes 10 days ahead. The index values ​​represent the total amount of phytoplankton at fixed monitoring station in the vicinity of Seili Island and reflect the level of eutrophication of the sea in general.

In the visualization, a larger sphere and a greener color indicate higher level of eutrophication and turbid seawater, and a smaller and bluer sphere for cleaner seawater. Thus, changes in index values ​​may indicate, for example, the onset of phytoplankton blooms as well as an increasing/decreasing state of seawater quality in general.

The prediction is based on the Generalized Additive Mixed Models (GAMM), which manifests the relationship between chlorophyll-α content and surface water/ surface air temperatures. The chlorophyll content data is based on data derived from the Seili automatic profiling monitoring buoy and temperature data from a 10-day long-term forecast from the Norwegian Meteorological Institute. The GAMM model of the index has been created by PhD Joni Virta University of Turku / Aalto University and the visualization by Tommy Löwendahl and the IT of the University of Turku.

Open data licence: The data at https://saaristomeri.utu.fi website is licenced with The Creative Commons Attribution 4.0 International license (CC BY 4.0). How to cite: “Seili Environmental monitoring programme, Seili-index portal. YEAR. Turku University/ Turku University of Applied sciences, Turku. https://saaristomeri.utu.fi/seili-index/”.

Seili-indeksi (Chl-a, ug/L)

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