Table 1. Summary of environmental variables measured in the water masses sampled for this study.
| Water mass | Depth range (m) | Temp (°C) | Salinity (PSU) | Chl a (mg m−3) | Dissolved oxygen (mg l−1) | NO2− (μm) | NO3− (μm) | NH4+ (μm) | Biogenic silicate (μm) | |
|---|---|---|---|---|---|---|---|---|---|---|
| UAASW (winter) | 10 | Max | −1.76 | 33.97 | 0.1 | ND | 0.2 | 36.9 | 1.0 | ND |
| Min | −1.84 | 33.90 | 0.1 | ND | 0.1 | 25.7 | 0.4 | ND | ||
| Mean | −1.80 | 33.93 | 0.1 | ND | 0.2 | 31.2 | 0.7 | ND | ||
| s.e. | 0.02 | 0.01 | 0.00 | ND | 0.02 | 1.6 | 0.10 | ND | ||
| LAASW (winter) | 55–75 | Max | −0.82 | 34.13 | 0.1 | ND | 0.2 | 36.5 | 1.1 | ND |
| Min | −1.83 | 33.91 | 0.1 | ND | 0.1 | 30.1 | 0.6 | ND | ||
| Mean | −1.62 | 33.97 | 0.1 | ND | 0.2 | 32.4 | 0.7 | ND | ||
| s.e. | 0.16 | 0.03 | 0.01 | ND | 0.01 | 0.9 | 0.08 | ND | ||
| CDW (winter) | 260–300 | Max | 2.09 | 34.68 | 0.1 | ND | 0.2 | 38.3 | 1.1 | ND |
| Min | 1.32 | 34.61 | 0.1 | ND | 0.0 | 29.6 | 0.5 | ND | ||
| Mean | 1.55 | 34.64 | 0.1 | ND | 0.1 | 34.8 | 0.9 | ND | ||
| s.e. | 0.11 | 0.01 | 0.001 | ND | 0.02 | 1.2 | 0.09 | ND | ||
| WW (summer) | 70–125 | Max | 0.27 | 34.03 | 1.5 | 8.4 | 0.3 | 32.5 | 5.6 | 1.4 |
| Min | −1.77 | 33.83 | 0.0 | 6.5 | 0.1 | 13.8 | 0.6 | 0.0 | ||
| Mean | −1.05 | 33.94 | 0.5 | 7.6 | 0.2 | 27.1 | 2.1 | 0.2 | ||
| s.e. | 0.10 | 0.01 | 0.09 | 0.07 | 0.01 | 0.9 | 0.26 | 0.09 | ||
| CDW (summer) | 285–500 | Max | 2.04 | 34.72 | 0.1 | 5.7 | 0.3 | 38.3 | 4.0 | 6.1 |
| Min | 0.19 | 34.32 | 0.0 | 3.9 | 0.0 | 12.6 | 0.1 | 0.0 | ||
| Mean | 1.40 | 34.65 | 0.0 | 4.2 | 0.1 | 30.2 | 1.0 | 0.4 | ||
| s.e. | 0.09 | 0.02 | 0.005 | 0.07 | 0.01 | 1.5 | 0.20 | 0.26 |
Abbreviations: CDW, circumpolar deep water; LAASW, lower Antarctic surface water (winter); ND, not determined; UAASW, upper Antarctic surface water (winter); WW, winter water.
Environmental conditions encountered on the Antarctic continental shelf west of the Antarctic Peninsula on 17–24 September 2010 (LMG 10-06) and 7–30 January 2011 (LMG 11-01). See Supplementary Table 1 for the complete data set. Values shown are maximum (Max); minimum (Min); mean and standard error of the mean (s.e.) for each variable.