| site | EC150 S/N | Lab H2O bias g/m3 (from N2 zero) | Lab H2O gain | Field H2O bias g/m3 28May | Lab CO2 bias mg/m3 (from (N2 zero) | Lab CO2 gain | Field CO2 bias mg/m3 28May |
|---|---|---|---|---|---|---|---|
| tnw02 | 1233 | -0.39 | 1.00 | 0.0 | -9 | 0.99 | +7 |
| tnw05 | 1384 | -0.96 | 0.93 | -2.4 | -29 | 0.93 | -25 |
| tnw09 | 1392 | +0.34 | 0.97 | -0.7 | -14 | 0.97 | -4 |
| tse01 | 1385 | 0.31 | 1.06 | -0.4 | +9 | 1.01 | +6 |
| tse02 | 1383 | -0.1 | 0.80 | -0.4 | -9 | 2.02(!) | -4 |
| tse05 | 1386** | -0.3 | 1.03 | +0.8 | -10 | 1.00 | +40 |
| tse07 | 1387/1389? | 0.94/0.96 | +0.2 | 0.98/0.99 | +16 | ||
| tse12 | 1390 | x | 0.92 | -1.0 | -1 | 1.00 | 0 |
| rsw04 | Li813 | +3.6 | +13 | ||||
| rne01 | 1807 (can't be right – 1432?) | 0.19 | 0.93 | -0.5 | 5 | 1.02 | -2 |
| rne06 | Li1166 | +3.0 | -10 | ||||
| rne07 | 1388 | -0.06 | 0.96 | -0.7 | -14 | 0.96 | +4 |
| v01 | 1386** | -0.3 | 1.03 | +0.3 | -10 | 1.00 | -5 |
| v03 | 1433 | x | 0.96 | +0.3 | -10 | -20 | |
| v04 | Li1167 | ||||||
| v06 | Li1164 | +3.4 | +13 | ||||
| v07 | Li1163 | +3.6 | +8 |
So...we have a mess:
- 3 EC150 serial numbers aren't known
- Haven't (yet) done lab tests of the LiCors
- Of the comparables, less than half agree between lab and field
- Only 2 EC150s have good comparisons with both H2O and CO2
- The LiCor H2O values all have a large offset from the EC150, they are about 2 g/m3 higher than TRH
- EC150.tnw02 used as the H2O reference is about 1.5 g/m3 lower than TRH. Even the highest EC150 value (tse05) is lower than the TRH by at least 0.5 g/m3.
- Even during the "well mixed" 28 May 21:00-23:00 case, TRH values vary by +/-0.4 g/m3, so a cross-site comparison can't be accurate.
- The good news: after 29May, the biases appear to be about constant. (There was a change in the period 26–29 May.)
- Licors, using v07 as a reference:
- before 26 May rsw04, v04, and v06 had biases of +0.2, -0.3, +0.3, respectively
- after 26 May, these had biases of
0.5,1.3, 0.0, respectively
- EC150s, using tse07 as a reference: biases are about constant throughout
- Licors, using v07 as a reference:
- 28May 21-23; 14 Jun 01-03; 22May 21-23; (but really want night cases – lots of wind, no local uptake...)