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Table 2

Monthly average values per experiment for weather and climate data. Data were collected from a climate station located near the study site (solar radiation and air temperature) and from an oxygen probe. Solar radiation and air temperature were logged every half hour, and oxygen was measured once a week. Day values are calculated as an average from 07:00 to 18:30 h, and night values are calculated from 19:00 to 06:30 h. Nutrient concentration was only measured in summer but is from the same source and with similar amount of nutrient pellets in the other seasons.

Abiotic conditions Month

March April June August October
Water physicochemical parameters
PO43−-P (mg L−1) NA NA 0.015 ± 0.017 NA NA
NH4+-N (mg L−1) NA NA 0.333 ± 0.131 NA NA
NO3-N (mg L−1) NA NA 0.852 ± 1.509 NA NA
Oxygen (water)          
% saturation NA NA 75.1 ± 14.2 108.8 ± 16.5 101.5 ± 16.7
ppm NA NA 7.0 ± 0.6 10.2 ± 1.4 10.7 ± 1.3
Weather and climatic conditions
Solar radiation (kW m−2)          
Day 0.20 ± 0.17 0.34 ± 0.22 0.37 ± 0.22 0.29 ± 0.18 0.13 ± 0.14
Air temperature (°C)          
Day 7.48 ± 4.03 10.1 ± 4.01 16.5 ± 2.78 17.5 ± 2.64 13.1 ± 2.62
Night 4.65 ± 3.12 6.20 ± 3.53 12.9 ± 2.46 13.4 ± 2.44 11.1 ± 2.78
Climate in Denmark1
Average temperature (°C) 3.5 7.7 14.3 16.7 9.8
Total hours of sunshine (h) 146 211 240 187 102
Precipitation (mm) 40 30 64 99 83

1Information about the climate in Denmark from DMI (the Danish Meteorological Institute) and is reference values for the period 2006–2015.

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