Table 1. Summary of sampling dates, times, depths, and variables used in this study as part of two separate projects with similar datasets.
| Nitrification project | Lake sentinel project | |
|---|---|---|
| Time span | October 2011 to October 2012 | January 2013 to September 2015 |
| Frequency | Monthly | Monthly and biweekly in summer |
| Depth of surface sample | 10% of PAR (~3 m) | epilimnion during stratified period (0.5 m) integrated sample during mixing (0–8 m) |
| Depth of bottom sample | 1% of PAR (~6 m) | metalimnion (3-8m) |
| O2 profile | ✓ | ✓ |
| PAR profile | ✓ | ✓ |
| NH4+ | ✓ | ✓ |
| NO3- + NO2- | ✓ | ✓ |
| N2O | ✓ (2012 only) | ✓ |
| AO rates | ✓ | |
| Night sampling | ✓ | |
| amoA presence | ✓ | |
| Chl a | ✓ |
Check marks indicate which measurements were made within each project. O2 corresponds to dissolved oxygen; PAR, photosynthetic active radiation; NH4+, ammonium; NO3+, nitrate; NO2-, nitrite; N2O, nitrous oxide; Chl a, chlorophyll a; AO, ammonia oxidation; amoA, ammonia monooxygenase subunit A gene.