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 |
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