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Raddatz, Jacek; Rüggeberg, Andres; Flögel, Sascha; Hathorne, Ed C; Liebetrau, Volker; Eisenhauer, Anton; Dullo, Wolf-Christian (2014): The influence of seawater pH on U/ Ca ratios in the scleractinian cold-water coral Lophelia pertusa. PANGAEA, https://doi.org/10.1594/PANGAEA.834573, Supplement to: Raddatz, Jacek; Rüggeberg, Andres; Flögel, Sascha; Hathorne, Ed C; Liebetrau, Volker; Eisenhauer, A; Dullo, Wolf-Christian (2014): The influence of seawater pH on U / Ca ratios in the scleractinian cold-water coral Lophelia pertusa. Biogeosciences, 11(7), 1863-1871, https://doi.org/10.5194/bg-11-1863-2014

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Abstract:
The increasing pCO2 in seawater is a serious threat for marine calcifiers and alters the biogeochemistry of the ocean. Therefore, the reconstruction of past-seawater properties and their impact on marine ecosystems is an important way to investigate the underlying mechanisms and to better constrain the effects of possible changes in the future ocean. Cold-water coral (CWC) ecosystems are biodiversity hotspots. Living close to aragonite undersaturation, these corals serve as living laboratories as well as archives to reconstruct the boundary conditions of their calcification under the carbonate system of the ocean.
We investigated the reef-building CWC Lophelia pertusa as a recorder of intermediate ocean seawater pH. This species-specific field calibration is based on a unique sample set of live in situ collected L. pertusa and corresponding seawater samples. These data demonstrate that uranium speciation and skeletal incorporation for azooxanthellate scleractinian CWCs is pH dependent and can be reconstructed with an uncertainty of ±0.15. Our Lophelia U / Ca-pH calibration appears to be controlled by the high pH values and thus highlighting the need for future coral and seawater sampling to refine this relationship. However, this study recommends L. pertusa as a new archive for the reconstruction of intermediate water mass pH and hence may help to constrain tipping points for ecosystem dynamics and evolutionary characteristics in a changing ocean.
Keyword(s):
Animalia; Benthic animals; Benthos; Biomass/Abundance/Elemental composition; Calcification/Dissolution; Cnidaria; Deep-sea; Field observation; Lophelia pertusa; Mediterranean Sea; North Atlantic; Polar; Single species; Temperate
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
Coverage:
Median Latitude: 49.484260 * Median Longitude: 1.618408 * South-bound Latitude: 34.999670 * West-bound Longitude: -12.768830 * North-bound Latitude: 70.267330 * East-bound Longitude: 22.456170
Minimum DEPTH, water: 290 m * Maximum DEPTH, water: 837 m
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 2014-07-31.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1SpeciesSpeciesRaddatz, Jacek
2LocationLocationRaddatz, Jacek
3LATITUDELatitudeGeocode
4LONGITUDELongitudeGeocode
5Temperature, waterTemp°CRaddatz, Jacek
6SalinitySalRaddatz, Jacek
7DEPTH, waterDepth watermGeocode
8Uranium/Calcium ratioU/Caµmol/molRaddatz, Jacek
9pHpHRaddatz, Jacektotal scale
10Carbonate ion[CO3]2-µmol/kgRaddatz, Jacek
11Aragonite saturation stateOmega ArgRaddatz, Jacek
12Carbon, inorganic, dissolvedDICµmol/kgRaddatz, Jacek
13Alkalinity, totalATµmol/kgRaddatz, Jacek
14Carbonate system computation flagCSC flagYang, YanCalculated using seacarb after Nisumaa et al. (2010)
15Carbon dioxideCO2µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
16Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
17Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
18Bicarbonate ion[HCO3]-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
19Carbonate ion[CO3]2-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
20Alkalinity, totalATµmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
21Aragonite saturation stateOmega ArgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
22Calcite saturation stateOmega CalYang, YanCalculated using seacarb after Nisumaa et al. (2010)
Size:
171 data points

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