Table 1. Physicochemical parameters at Gotland Deep and Landsort Deep.
| Sampling location | Depth zone | Depth | Temp | Sal | Turb | PO4 | NO2 | NO3 | NH4 | O2 | H2S | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (m) | (°C) | (ntu) | (μM) | (μg/L) | (μM) | (μg/L) | (μM) | (μg/L) | (μM) | (μg/L) | (μM) | (μg/L) | (μM) | (μg/L) | |||
| Gotland Deep | Oxic Zone | 80 | 4.77 | 9.32 | 0.06 | 2.2 | 208.8 | 0.3 | 13.1 | 1.0 | 62.6 | 1.0 | 17.9 | 41.4 | 1326.2 | n.d. | n.d. |
| Transition Zone | 90 | 5.25 | 10.18 | 0.10 | 3.6 | 346.6 | 0.7 | 31.8 | n.d. | n.d. | 1.4 | 25.6 | 0.6 | 19.3 | 1.3 | 43.4 | |
| Anoxic Zone | 95 | 5.32 | 10.34 | 0.31 | 3.5 | 333.2 | 0.4 | 18.7 | n.d. | n.d. | 2.1 | 38.1 | n.d. | n.d. | 3.2 | 108.9 | |
| Landsort Deep 1 | Suboxic Zone | 75 | 5.21 | 9.57 | 0.18 | 2.9 | 279.6 | 0.4 | 16.8 | 3.6 | 220.6 | 0.4 | 7.2 | 13.5 | 430.7 | n.d. | n.d. |
| Transition Zone | 85 | 5.42 | 9.95 | 0.09 | 3.5 | 328.4 | 0.2 | 10.3 | n.d. | n.d. | 3.1 | 56.8 | 1.3 | 40.3 | 0.2 | 6.7 | |
| Anoxic Zone | 95 | 5.49 | 10.07 | 0.51 | 3.5 | 328.4 | 0.1 | 4.7 | n.d. | n.d. | 4.2 | 76.6 | n.d. | n.d. | 4.6 | 156.3 | |
| Landsort Deep 2 | Transition Zone | 78 | 5.26 | 9.61 | 0.18 | 3.4 | 325.6 | 0.3 | 15.8 | 4.5 | 279.0 | <0.1 | <0.1 | 4.4 | 142.3 | 0.4 | 13.4 |
| Anoxic Zone 1 | 90 | 5.43 | 9.95 | 0.24 | 3.7 | 350.2 | <0.1 | 1.9 | <0.1 | <0.1 | 3.4 | 60.7 | n.d. | n.d. | 0.3 | 9.4 | |
| Anoxic Zone 2 | 100 | 5.50 | 10.10 | 0.43 | 3.4 | 323.3 | <0.1 | 1.9 | n.d. | n.d. | 4.0 | 72.1 | n.d. | n.d. | 4.0 | 135.6 | |
The table gives depth, temperature (Temp), salinity (Sal), turbidity (Turb; nephelometric turbidity units), PO4, NO2, NO3, NH4, O2, and H2S at Gotland Deep, Landsort Deep 1, and Landsort Deep 2. Depth zone classification was based on O2 and H2S. Values below the detection limit are indicated as not detectable (n.d.).