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Published byLeah Bauer
Modified over 4 years ago
Lake Erken field station SwedenThorsten Blenckner
Lake Erken Lake Erken, dimictic Catchment area (km2) 141Lake 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, , 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
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
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The Erken Laboratory Thorsten Blenckner. Lake Erken Lake Erken, dimictic Catchment area (km 2 )141 Lake area (km 2 )24 Mean depth (m)9 Max depth (m)21.
… with a trend of improving trophic status. Inflow (757 r. km) mg chl a m -3 Outflow (163 r. km) mg chl a m -3 An order of magnitude increase in 1-2 weeks.
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1...and a lot of it passes through agricultural land (picture taken at midnight in northern Sweden!!) (picture taken at midnight in northern Sweden!!)
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