Citation:

srep26888

Name: Understanding cold bias: Variable response of skeletal Sr/Ca to seawater pCO2 in acclimated massive Porites corals
Published: 2016-10-31
License: https://creativecommons.org/licenses/by/3.0/
Keywords: Animalia; Benthic animals; Benthos; Biomass/Abundance/Elemental composition; Cnidaria; Containers and aquaria (20-1000 L or < 1 m**2); Growth/Morphology; Laboratory experiment; Laboratory strains; Not applicable; Porites lutea; Porites murrayensis; Single species

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Abstract:

Coral skeletal Sr/Ca is a palaeothermometer commonly used to produce high resolution seasonal sea surface temperature (SST) records and to investigate the amplitude and frequency of ENSO and interdecadal climate events. The proxy relationship is typically calibrated by matching seasonal SST and skeletal Sr/Ca maxima and minima in modern corals. Applying these calibrations to fossil corals assumes that the temperature sensitivity of skeletal Sr/Ca is conserved, despite substantial changes in seawater carbonate chemistry between the modern and glacial ocean. We present Sr/Ca analyses of 3 genotypes of massive Porites spp. corals (the genus most commonly used for palaeoclimate reconstruction), cultured under seawater pCO2 reflecting modern, future (year 2100) and last glacial maximum (LGM) conditions. Skeletal Sr/Ca is indistinguishable between duplicate colonies of the same genotype cultured under the same conditions, but varies significantly in response to seawater pCO2 in two genotypes of Porites lutea, whilst Porites murrayensis is unaffected. Within P. lutea, the response is not systematic: skeletal Sr/Ca increases significantly (by 2-4%) at high seawater pCO2 relative to modern in both genotypes, and also increases significantly (by 4%) at low seawater pCO2 in one genotype. This magnitude of variation equates to errors in reconstructed SST of up to -5 °C.

Keyword(s):

Animalia; Benthic animals; Benthos; Biomass/Abundance/Elemental composition; Cnidaria; Containers and aquaria (20-1000 L or < 1 m**2); Growth/Morphology; Laboratory experiment; Laboratory strains; Not applicable; Porites lutea; Porites murrayensis; Single species

Further details:

Gattuso, Jean-Pierre; Epitalon, Jean-Marie; Lavigne, Héloïse (2015): seacarb: seawater carbonate chemistry with R. R package version 3.0.8. https://cran.r-project.org/package=seacarb

Project(s):

Ocean Acidification International Coordination Centre (OA-ICC)

Comment:

In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2015) 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 2016-10-31.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Type	Type		Cole, Catherine		study
2	Species	Species		Cole, Catherine
3	Registration number of species	Reg spec no		Cole, Catherine
4	Uniform resource locator/link to reference	URL ref		Cole, Catherine		WoRMS Aphia ID
5	Genotype	Genotype		Cole, Catherine
6	Treatment	Treat		Cole, Catherine
7	Colony number/ID	Colony no/ID		Cole, Catherine
8	Identification	ID		Cole, Catherine		Skeletal unit
9	Linear extension	Lin ext	µm	Cole, Catherine
10	Strontium/Calcium ratio	Sr/Ca	mmol/mol	Cole, Catherine
11	Confidence interval	CI		Cole, Catherine		Strontium/Calcium ratio, 95% CI
12	Strontium/Calcium partition coefficient	Kd Sr/Ca		Cole, Catherine		seawater
13	Confidence interval	CI		Cole, Catherine		seawater Strontium/Calcium partition coefficient, 95% CI
14	Replicates	Repl	#	Cole, Catherine
15	Linear extension	Lin ext	µm	Cole, Catherine		mean
16	Linear extension, standard error	Lin ext std e	±	Cole, Catherine
17	Calcification rate of carbon	Calc rate C	µmol/cm²/day	Cole, Catherine
18	Calcification rate, standard error	Calc rate std e	±	Cole, Catherine
19	Strontium/Calcium ratio	Sr/Ca	mmol/mol	Cole, Catherine		seawater
20	Strontium/Calcium ratio, standard error	Sr/Ca std e	±	Cole, Catherine		seawater
21	Temperature, water	Temp	°C	Cole, Catherine
22	Temperature, water, standard error	T std e	±	Cole, Catherine
23	Salinity	Sal		Cole, Catherine
24	Salinity, standard error	Sal std e	±	Cole, Catherine
25	Alkalinity, total	AT	µmol/kg	Cole, Catherine	Potentiometric titration
26	Alkalinity, total, standard error	AT std e	±	Cole, Catherine	Potentiometric titration
27	Carbon, inorganic, dissolved	DIC	µmol/kg	Cole, Catherine
28	Carbon, inorganic, dissolved, standard error	DIC std e	±	Cole, Catherine
29	pH	pH		Cole, Catherine	Calculated using CO2SYS	total scale
30	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Cole, Catherine	Calculated using CO2SYS
31	Bicarbonate ion	[HCO3]-	µmol/kg	Cole, Catherine	Calculated using CO2SYS
32	Carbonate ion	[CO3]2-	µmol/kg	Cole, Catherine	Calculated using CO2SYS
33	Aragonite saturation state	Omega Arg		Cole, Catherine	Calculated using CO2SYS
34	Carbonate system computation flag	CSC flag		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
35	pH	pH		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	total scale
36	Carbon dioxide	CO2	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
37	Fugacity of carbon dioxide (water) at sea surface temperature (wet air)	fCO2water_SST_wet	µatm	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
38	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
39	Bicarbonate ion	[HCO3]-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
40	Carbonate ion	[CO3]2-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
41	Aragonite saturation state	Omega Arg		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
42	Calcite saturation state	Omega Cal		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

1684 data points

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