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Hendriks, Iris; Olsen, Ylva; Ramajo, L; Basso, L; Steckbauer, Alexandra; Moore, T S; Howard, J; Duarte, Carlos M (2014): Photosynthetic activity buffers ocean acidification in seagrass meadows. PANGAEA, https://doi.org/10.1594/PANGAEA.834083, Supplement to: Hendriks, I et al. (2014): Photosynthetic activity buffers ocean acidification in seagrass meadows. Biogeosciences, 11(2), 333-346, https://doi.org/10.5194/bg-11-333-2014

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Abstract:
Macrophytes growing in shallow coastal zones characterised by intense metabolic activity have the capacity to modify pH within their canopy and beyond. We observed diel pH changes in shallow (5-12 m) seagrass (Posidonia oceanica) meadows spanning 0.06 pH units in September to 0.24 units in June. The carbonate system (pH, DIC, and aragonite saturation state (omega Ar)) and O2 within the meadows displayed strong diel variability driven by primary productivity, and changes in chemistry were related to structural parameters of the meadow, in particular, the leaf surface area available for photosynthesis (LAI). LAI was positively correlated to mean, max and range pHNBS and max and range omega Ar. In June, vertical mixing (as Turbulent Kinetic Energy) influenced max and min omega Ar, while in September there was no effect of hydrodynamics on the carbonate system within the canopy. Max and range omega Ar within the meadow showed a positive trend with the calcium carbonate load of the leaves, pointing to a possible link between structural parameters, omega Ar and carbonate deposition.
Further details:
Lavigne, Héloise; Epitalon, Jean-Marie; Gattuso, Jean-Pierre (2014): seacarb: seawater carbonate chemistry with R. R package version 3.0. https://cran.r-project.org/package=seacarb
Comment:
In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne et al, 2014) 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). The date of carbonate chemistry calculation is 2014-07-16.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1SpeciesSpeciesHendriks, Iris
2Time point, descriptiveTime pointHendriks, Irisyear
3SeasonSeasonHendriks, Iris
4Station labelStationHendriks, Iris
5SiteSiteHendriks, Iris
6Temperature, waterTemp°CHendriks, Iris
7Temperature, water, standard deviationTemp std dev±Hendriks, Iris
8IlluminanceE vlxHendriks, Iris
9Illuminance, standard deviationE v std dev±Hendriks, Iris
10Shoot densityShoot den#/m2Hendriks, Iris
11Shoot density, standard errorShoot den std e±Hendriks, Iris
12BiomassBiomg/m2Hendriks, Iris
13Leaf area indexLAIHendriks, Iris
14Calcium carbonate, inorganicCaCO3 inorgHendriks, Irisper m**2
15OxygenO2µmol/lHendriks, Irismean
16OxygenO2µmol/lHendriks, Irisrange
17TimeTime%Hendriks, Irisover unvegetated pH
18Flow velocity, waterVel waterm/sHendriks, Iris
19Flow velocity, water, standard errorVel water std e±Hendriks, Iris
20pHpHHendriks, IrisPotentiometricNBS scale, max
21pHpHHendriks, IrisPotentiometricNBS scale, min
22pHpHHendriks, IrisPotentiometricNBS scale, range
23pHpHHendriks, IrisPotentiometricNBS scale, mean
24Aragonite saturation stateOmega ArgHendriks, IrisPyrheliometer, Eppley, NIP, SN 16523E6, WRMC No. 31296max
25Aragonite saturation stateOmega ArgHendriks, IrisPyrheliometer, Eppley, NIP, SN 16523E6, WRMC No. 31296min
26Aragonite saturation stateOmega ArgHendriks, IrisPyrheliometer, Eppley, NIP, SN 16523E6, WRMC No. 31296range
27Aragonite saturation stateOmega ArgHendriks, IrisPyrheliometer, Eppley, NIP, SN 16523E6, WRMC No. 31296mean
28Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmHendriks, IrisPyrheliometer, Eppley, NIP, SN 16523E6, WRMC No. 31296mean
29Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmHendriks, IrisPyrheliometer, Eppley, NIP, SN 16523E6, WRMC No. 31296range
30Carbon, inorganic, dissolvedDICµmol/kgHendriks, IrisPyrheliometer, Eppley, NIP, SN 16523E6, WRMC No. 31296mean
31Carbon, inorganic, dissolvedDICµmol/kgHendriks, IrisPyrheliometer, Eppley, NIP, SN 16523E6, WRMC No. 31296range
32SalinitySalHendriks, Iris
33Salinity, standard deviationSal std dev±Hendriks, Iris
34Carbonate system computation flagCSC flagYang, YanCalculated using seacarb after Nisumaa et al. (2010)
35pHpHYang, YanCalculated using seacarb after Nisumaa et al. (2010)total scale
36Carbon dioxideCO2µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
37Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
38Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
39Bicarbonate ion[HCO3]-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
40Carbonate ion[CO3]2-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
41Alkalinity, totalATµmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
42Aragonite saturation stateOmega ArgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
43Calcite saturation stateOmega CalYang, YanCalculated using seacarb after Nisumaa et al. (2010)
Size:
560 data points

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