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Langdon, Chris; Atkinson, M J (2005): Seawater carbonate chemistry, calcification and photosynthesis during experiments with corals, 2005 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.721194, Supplement to: Langdon, C; Atkinson, MJ (2005): Effect of elevated pCO2 on photosynthesis and calcification of corals and interactions with seasonal change in temperature/irradiance and nutrient enrichment. Journal of Geophysical Research: Oceans, 110, C09S07, https://doi.org/10.1029/2004JC002576

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Abstract:
An investigation was conducted to determine the effects of elevated pCO2 on the net production and calcification of an assemblage of corals maintained under near-natural conditions of temperature, light, nutrient, and flow. Experiments were performed in summer and winter to explore possible interactions between seasonal change in temperature and irradiance and the effect of elevated pCO2. Particular attention was paid to interactions between net production and calcification because these two processes are thought to compete for the same internal supply of dissolved inorganic carbon (DIC). A nutrient enrichment experiment was performed because it has been shown to induce a competitive interaction between photosynthesis and calcification that may serve as an analog to the effect of elevated pCO2. Net carbon production, NPC, increased with increased pCO2 at the rate of 3 ± 2% (?mol CO2aq kg?1)?1. Seasonal change of the slope NPC-[CO2aq] relationship was not significant. Calcification (G) was strongly related to the aragonite saturation state ? a . Seasonal change of the G-? a relationship was not significant. The first-order saturation state model gave a good fit to the pooled summer and winter data: G = (8 ± 1 mmol CaCO3 m?2 h?1)(? a ? 1), r 2 = 0.87, P = 0.0001. Both nutrient and CO2 enrichment resulted in an increase in NPC and a decrease in G, giving support to the hypothesis that the cellular mechanism underlying the decrease in calcification in response to increased pCO2 could be competition between photosynthesis and calcification for a limited supply of DIC.
Keyword(s):
Benthos; Calcification/Dissolution; Coast and continental shelf; Entire community; Laboratory experiment; Light; Mesocosm or benthocosm; North Pacific; Primary production/Photosynthesis; Rocky-shore community; Single species; Temperature; Tropical
Project(s):
European network of excellence for Ocean Ecosystems Analysis (EUR-OCEANS)
European Project on Ocean Acidification (EPOCA)
Ocean Acidification International Coordination Centre (OA-ICC)
Funding:
Seventh Framework Programme (FP7), grant/award no. 211384: European Project on Ocean Acidification
Sixth Framework Programme (FP6), grant/award no. 511106: European network of excellence for Ocean Ecosystems Analysis
Event(s):
LA_05-01/00  * Method/Device: Experiment (EXP)
LA_05-08/99  * Method/Device: Experiment (EXP)
Comment:
In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne and Gattuso, 2011) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI).
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 Event labelEvent
2 Experimental treatmentExp treatLangdon, Chris
3 Carbonate system computation flagCSC flagNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
4 Temperature, waterTemp°CLangdon, Chris
5 SalinitySalLangdon, Chris
6 Radiation, photosynthetically activePARµmol/m2/sLangdon, Chris
7 OxygenO2µmol/lLangdon, Chris
8 pHpHLangdon, ChrisCalculated using CO2SYSSeawater scale
9 pHpHNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)Total scale
10 Alkalinity, totalATµmol/kgLangdon, ChrisAlkalinity, Gran titration (Gran, 1950)
11 Carbon, inorganic, dissolvedDICµmol/kgLangdon, ChrisCoulometric titration
12 Carbon dioxideCO2µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
13 Bicarbonate ion[HCO3]-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
14 Carbonate ion[CO3]2-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
15 Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
16 Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
17 Aragonite saturation stateOmega ArgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
18 Calcite saturation stateOmega CalNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
19 Calcification rate of calcium carbonateCalc rate CaCO3mmol/m2/hLangdon, ChrisAlkalinity anomaly technique (Smith and Key, 1975)
20 Net community production of carbonNCP Cmmol/m2/dayLangdon, ChrisCalculated
21 Integrated net community production of oxygenINCP O2mmol/m2/dayLangdon, ChrisCalculated
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
180 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 
Event		2 
Exp treat		3 
CSC flag
(Calculated using seacarb afte...)		4 
Temp [°C]		5 
Sal		6 
PAR [µmol/m2/s]		7 
O2 [µmol/l]		8 
pH
(Seawater scale, Calculated us...)		9 
pH
(Total scale, Calculated using...)		10 
AT [µmol/kg]
(Alkalinity, Gran titration (G...)		11 
DIC [µmol/kg]
(Coulometric titration)		12 
CO2 [µmol/kg]
(Calculated using seacarb afte...)		13 
[HCO3]- [µmol/kg]
(Calculated using seacarb afte...)		14 
[CO3]2- [µmol/kg]
(Calculated using seacarb afte...)		15 
pCO2water_SST_wet [µatm]
(Calculated using seacarb afte...)		16 
fCO2water_SST_wet [µatm]
(Calculated using seacarb afte...)		17 
Omega Arg
(Calculated using seacarb afte...)		18 
Omega Cal
(Calculated using seacarb afte...)		19 
Calc rate CaCO3 [mmol/m2/h]
(Alkalinity anomaly technique ...)		20 
NCP C [mmol/m2/day]
(Calculated)		21 
INCP O2 [mmol/m2/day]
(Calculated)
LA_05-08/99 Run 1.0x1527.338.312162097.967.972226.81934.212.111719.03203.06460.43459.023.174.76161080888
LA_05-08/99Run 1.8x1527.338.311382097.747.752095.81923.820.771776.59126.44789.80787.381.982.9791320864
LA_05-01/00 Before nutrient enrichment run 1.0x1523.838.37122308.028.032223.51926.411.211710.79204.40390.80389.553.154.7815552552
LA_05-01/00Before nutrient enrichment run 1.3x1523.838.38312307.907.912145.11919.115.081745.81158.21525.76524.082.443.7012768744
LA_05-01/00Before nutrient enrichment run 1.8x1524.438.38512307.747.752077.51923.722.051787.12114.53780.80778.331.772.683840504
LA_05-01/00After nutrient enrichment run 1.0x1523.238.37582308.048.052280.91972.011.061747.14213.80379.79378.573.284.9913816720
LA_05-01/00After nutrient enrichment run 1.3x1523.838.36252307.907.912149.01922.815.111749.22158.47526.95525.272.443.7013840792
LA_05-01/00After nutrient enrichment run 1.8x1522.838.37112307.767.772058.11906.421.571772.70112.13732.81730.441.722.62131032816
LA_05-01/00After nutrient enrichment run 0.3x1523.738.36052308.258.262441.21963.96.301628.46329.14218.95218.255.077.6916816696