Table 3.
Uncertainty budgets for cases 1 and 4 at temperatures of 5 and 20 °C.
| Inputsa | Calibration environment: water | |||
|---|---|---|---|---|
| Case 1 | Case 4 | Case 1 | Case 4 | |
| Measurement conditions | ||||
| Cmeas (mg dm−3) | 12.71 | 12.71 | 9.01 | 9.01 |
| tmeas (°C) a | 5 | 5 | 20 | 20 |
| stirring speed_meas (cm s−1) | 30 | 30 | 30 | 30 |
| tcal (°C) a | 20 | 20 | 20 | 20 |
| u(pcal) (Pa) | 150 | 150 | 150 | 150 |
| stirring speed_cal (cm s−1) | 30 | 20 | 30 | 20 |
| Δday_newΔcal-meas (day) | 0 | 5 | 0 | 5 |
| Δday_oldΔcal-meas (day) | 0 | 0 | 0 | 0 |
| Δmonth (month) | 0 | 0.5 | 0 | 0.5 |
| Input Parameters (xi)a | Uncertainty contributions (indexes) of the input parameters xi | |||
| tcal | 0% | 0% | 0% | 0% |
| ΔTinstab | 0% | 0% | 1% | 0% |
| ΔJ0 | 2% | 0% | 0% | 0% |
| ΔJcal_output | 2% | 1% | 12% | 1% |
| pcal | 3% | 0% | 15% | 0% |
| ΔCsat_cal | 9% | 1% | 47% | 1% |
| ΔpCO2 | 0% | 0% | 1% | 0% |
| ΔpH2O_cal | 2% | 0% | 9% | 0% |
| ΔCread_cal | 0% | 0% | 0% | 0% |
| tmeas | 3% | 0% | 0% | 0% |
| ΔJ_meas_output | 2% | 3% | 12% | 4% |
| ΔCread_meas | 0% | 0% | 1% | 0% |
| Δlsme_drift | 0% | 2% | 4% | 2% |
| ΔEsme_drift | 0% | 0% | 0% | 0% |
| ΔJstir | 0% | 81% | 0% | 91% |
| Esme_membrane | 77% | 10% | 0% | 0% |
| Expanded uncertainties (k = 2) of Cmeas | ||||
| U(Cmeas) | 0.24 | 0.66 | 0.07 | 0.44 |
| U(Cmeas), relative | 1.9% | 5.2% | 0.8% | 4.9% |
a
The definitions of all the quantities and parameters are given in reference [31].