Table 1 Properties of ambient and CO2 enriched seawater (mean ± 1 SD) in the experimental units.

From: Biogeochemical feedbacks to ocean acidification in a cohesive photosynthetic sediment

 

Ambient

CO2 enriched

Measured parameters

Temperature

14.6 ± 0.15

14.7 ± 0.16

Salinity

34.5 ± 0.07

34.5 ± 0.06

DIC

2112 ± 5

2261 ± 13

TA

2302 ± 10

2314 ± 10

Calculated parameters at 15 °C

pHT

7.99 ± 0.01

7.62 ± 0.03

[H+]

10.3 ± 0.2

23.6 ± 0.9

pCO2

472 ± 7

1216 ± 88

[CO32−]

139 ± 3

66 ± 4

ΩCA

3.32 ± 0.06

1.57 ± 0.09

ΩAR

2.13 ± 0.04

1.01 ± 0.06

  1. Temperature (°C) and salinity are averages of 22 daily measurements whereas DIC and TA (µmol kg SW−1) are averages of five measurements taken during the final 10 d of the experiment when the pH was stabilised at the target value (Fig. S1). Seawater pH (total scale), [H+] (nmol L−1), pCO2 (μatm), [CO32−] (µmol kg SW−1). The calcite and aragonite saturation states (ΩCA and ΩAR, respectively) were derived from the measured parameters for a temperature of 15 °C.
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