Metadata field: filtration_upper_threshold_um
Studies:
- Larkin_2021_GO-SHIP_marine (971 samples)
- TARA_Oceans_protists (828 samples)
- Boeuf_2021_marine_HOT_ALOHA (503 samples)
- Biller_2018_GEOTRACES_marine_pelagic (480 samples)
- 58 other studies (2617 samples)
Scope: ocean, environmental
Type: numeric
Description: For ocean water and freshwater samples: upper size cutoff for the filtration during sample collection, i.e. the pre-filter pore size in µm. The contents of this filter are discarded (or at least not sequenced in this particular size fraction).
Examples: 3, 0.2, but also Infinity (when there is no pre-filtering step)
| Value | Count |
|---|---|
| Infinity | 3100 |
| 5 | 457 |
| 3 | 443 |
| 0.2 | 279 |
| 20 | 210 |
| 2000 | 199 |
| 180 | 184 |
| 200 | 126 |
| 2.7 | 104 |
| 10 | 83 |
| 1.2 | 57 |
| 0.22 | 48 |
| 1.6 | 42 |
| 0.8 | 18 |
| 80 | 18 |
| 100 | 12 |
| 50 | 12 |
| 0.1 | 6 |
| 30 | 1 |