Table 1. Key catchment characteristics and DOC simulation parameters.
Window durations provide the number of days up to and including the day of collection of each DOC record over which the respective variables were averaged (or, in the case of precipitation EC, volume-weighted). Q10 values represent the proportional response in DOC relative to a 10°C rise in local air temperature [determined as the exponent of the temperature coefficient (α) × 10]. βA and βB represent nonlinear discharge effect parameters. The “discharge units and transformation” column provides the units of the original daily discharge measurements, and any multiplication factor or log transformation applied before modeling (see Materials and Methods). NA, not applicable.
| Site | Catchment area (km2) | Runoff (m) | Catchment % peat + peaty gley cover | DOC median (mg/liter) | Precipitation EC window (days) | Air temperature window (days) | Q 10 | Discharge units and transformation |
β A |
β B |
Model R2 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Storgama | 0.60 | 0.95 | 0 | 5.5 | 160 | 60 | 1.25 | NA | NA | NA | 0.48 |
| Gårdsjon | 0.04 | 0.52 | 8 | 11.6 | 169 | 18 | 1.57 | ln(liter s−1 × 103) | 4.10 | 0.92 | 0.46 |
| Birkenes | 0.40 | 1.10 | 2 | 4.9 | 139 | 11 | 1.52 | ln(liter s−1 × 103) | 0.80 | 0.50 | 0.67 |
| Afon Gwy | 2.10 | 2.14 | 40 | 2.3 | 110 | 9 | 1.82 | ln(m3 s−1 × 103) | 4.65 | 1.08 | 0.50 |
| Allt a’Mharcaidh | 9.98 | 0.77 | 54 | 2.5 | 600 | 23 | 2.69 | m3 s−1 | 4.40 | 0.85 | 0.47 |
| River Etherow | 13.0 | 1.09 | 90 | 6.8 | 270 | 16 | 2.23 | m3 s−1 | 1.60 | 0.83 | 0.31 |
| Pluhuv Bor | 0.22 | 0.23 | 2 | 14.4 | 250 | 60 | 1.35 | Liter s−1 | 0.16 | 0.64 | 0.78 |
| Lysina | 0.27 | 0.43 | 6 | 14.0 | 410 | 74 | 1.28 | Liter s−1 | 0.78 | 0.50 | 0.81 |