Lake Erken field station Sweden

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Presentation transcript:

Lake Erken field station Sweden Thorsten Blenckner

Lake Erken Lake Erken, dimictic Catchment area (km2) 141 Lake area (km2) 24 Mean depth (m) 9 Max depth (m) 21 Residence time (ys) 7 Mean TP (µg/l) 27 Mean summer Chl a (µg/l) 4

Monitoring programme Manual monitoring (winter monthly, otherwise weekly, 1974-79, 1993-now): Temp., Oxygen, Secchi, pH, alk, cond, colour, diss. + part.+total nutrients, Chl a, phytoplankton counts

Monitoring programme Automatic monitoring (Island, hourly, 1988-now): Weather station: air temperature, global radiation, PAR, wind speed and direction, Water temperature 1, 2.5 and 14 m Delayed fluorescence Automatic monitoring (Float, 30 min, 1988-now): Water temperature every 0.5 m YSI 6920 Sonde (last year): Temp., Cond., DO, Fluor., pH

Stability

Delayed fluorescence Surface, 2.5 and 7 m Every 30 min

Monitoring programme Automatic monitoring (Erken inflow and Galten inflow, hourly): Discharge, water temperature, CDOM (fluorometer) and turbidity (trans-missometer, 660nm)

Data graph from inflows

Oecologia study