Table 1 Seawater conditions over the experiment (averages ± SE).

From: In situ response of Antarctic under-ice primary producers to experimentally altered pH

Treatment

Inflow

Outflow

pHT

pCO2

DIC

ΩAr

ΩCa

pHT

pCO2

DIC

ΩAr

ΩCa

Ambient

7.99 ± 0.002

457.3 ± 7.37

2259.3 ± 2.62

1.2 ± 0.02

1.8 ± 0.03

8.08 ± 0.002

374.9 ± 18.01

2232.4 ± 8.06

1.4 ± 0.05

2.2 ± 0.08

pH low 1

7.86 ± 0.006

641.5 ± 16.28

2301.3 ± 4.48

0.9 ± 0.02

1.4 ± 0.03

8.00 ± 0.005

449.6 ± 25.98

2256.7 ± 8.96

1.2 ± 0.05

1.9 ± 0.09

pH low 2

7.75 ± 0.008

802.3 ± 20.02

2328.0 ± 3.49

0.7 ± 0.02

1.1 ± 0.03

7.96 ± 0.011

504.9 ± 62.24

2269.8 ± 16.73

1.1 ± 0.11

1.7 ± 0.17

pH low 3

7.61 ± 0.006

1166.2 ± 57.47

2373.2 ± 6.97

0.5 ± 0.02

0.8 ± 0.04

7.87 ± 0.012

639.9 ± 90.00

2298.6 ± 18.38

0.9 ± 0.10

1.4 ± 0.16

  1. Inflow = water delivered to the chambers; Outflow = water resident in the chambers for approximately 12 h. Measured pHT is presented at average in situ temperature (−1.85 °C), and is an average over the 14 days of the experiment (N = 14). pCO2 (μatm), dissolved inorganic carbon (DIC; μmol kg−1) and saturation states of aragonite and calcite (ΩAr and ΩCa) were calculated using measured pHT, AT, temperature and salinity, and Mehrbach equilibrium constants refit by Dickson and Millero (1987). These calculations were done separately for Days 1, 7 and 14, and the averages ( ± SE) of these three days are presented here. Measured AT = 2348.9 ± 1.86, 2344.5 ± 0.636, and 2342.8 ± 6.4, on Days 1, 7 and 14, respectively (N = 14 chambers/day).
Back to article page