Citation:

2017GC007225

Name: Seawater carbonate chemistry and incorporation of Mg, Sr, Ba, U, and B in High-Mg Calcite Benthic Foraminifers
Published: 2018-06-19
License: https://creativecommons.org/licenses/by/3.0/
Keywords: Amphisorus hemprichii; Baculogypsina sphaerulata; Benthos; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (<20 L); Coast and continental shelf; Foraminifera; Heterotrophic prokaryotes; Laboratory experiment; North Pacific; Single species; Temperate

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Published: 2018-06-19 • DOI registered: 2018-07-25

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Abstract:

Measurement of elemental ratios (E/Ca) have been performed in two symbiont-bearing species of high-Mg calcite benthic foraminifers (hyaline, Baculogypsina sphaerulata and porcelaneous, Amphisorus hemprichii), cultured under five pCO2 levels, representing pre-industrial, modern and three predicted future values. E/Ca ratios were analyzed by Laser Ablation coupled with Inductively Coupled Plasma Mass Spectrometer (LA-ICP-MS). We measured several E/Ca such as Mg/Ca, Sr/Ca, Ba/Ca, U/Ca and B/Ca simultaneously. We observed that high-Mg calcite benthic foraminifers possess higher E/Ca than low-Mg calcite foraminifers, irrespective of their calcification mode (hyaline or porcelaneous). In both modes of calcification, Mg, Sr, Ba, U and B incorporation could be controlled by Rayleigh fractionation. However, more data is needed to validate and quantify the relative importance this process and closely investigate the presence/absence of other mechanism. Therefore, it highlights the need for a multi-elemental approach when looking at trace element incorporation. Finally, no significant relationship was observed between the different ratios and the pCO2 of the water, suggesting that none of the Mg/Ca, Sr/Ca, Ba/Ca, U/Ca and B/Ca is sensitive to bottom water pCO2 or pH in these species.

Keyword(s):

Amphisorus hemprichii; Baculogypsina sphaerulata; Benthos; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (<20 L); Coast and continental shelf; Foraminifera; Heterotrophic prokaryotes; Laboratory experiment; North Pacific; Single species; Temperate

Further details:

Gattuso, Jean-Pierre; Epitalon, Jean-Marie; Lavigne, Héloïse; Orr, James C; Gentili, Bernard; Proye, Aurélien; Soetaert, Karline; Rae, James (2016): seacarb: seawater carbonate chemistry with R. R package version 3.1. 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, 2016) 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 by seacarb is 2018-05-23.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Type	Type		Not, C		study
2	Species	Species		Not, C
3	Registration number of species	Reg spec no		Not, C
4	Uniform resource locator/link to reference	URL ref		Not, C		WoRMS Aphia ID
5	Experiment duration	Exp duration	days	Not, C
6	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Not, C		treatment
7	Magnesium/Calcium ratio	Mg/Ca	mmol/mol	Not, C
8	Magnesium/Calcium ratio, standard deviation	Mg/Ca std dev	±	Not, C
9	Strontium/Calcium ratio	Sr/Ca	mmol/mol	Not, C
10	Strontium/Calcium ratio, standard deviation	Sr/Ca std dev	±	Not, C
11	Barium/Calcium ratio	Ba/Ca	µmol/mol	Not, C
12	Barium/Calcium ratio, standard deviation	Ba/Ca std dev	±	Not, C
13	Uranium/Calcium ratio	U/Ca	nmol/mol	Not, C
14	Uranium/Calcium ratio, standard deviation	U/Ca std dev	±	Not, C
15	Boron/Calcium ratio	B/Ca	µmol/mol	Not, C
16	Boron/Calcium ratio, standard deviation	B/Ca std dev	±	Not, C
17	Temperature, water	Temp	°C	Not, C
18	pH, NBS scale	pH NBS		Not, C		NBS scale, at 25 °C
19	pH, standard deviation	pH std dev	±	Not, C		NBS scale, at 25 °C
20	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Not, C
21	Partial pressure of carbon dioxide, standard deviation	pCO2 std dev	±	Not, C
22	Carbonate ion	[CO3]2-	µmol/kg	Not, C
23	Bicarbonate ion	[HCO3]-	µmol/kg	Not, C
24	Carbon, inorganic, dissolved	DIC	µmol/kg	Not, C
25	Aragonite saturation state	Omega Arg		Not, C
26	Calcite saturation state	Omega Cal		Not, C
27	Salinity	Sal		Not, C
28	Alkalinity, total	AT	µmol/kg	Not, C
29	Mass	Mass	µg	Not, C
30	Diameter	Ø	µm	Not, C
31	Carbonate system computation flag	CSC flag		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
32	pH, total scale	pHT		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	total scale
33	Carbon dioxide	CO2	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
34	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)
35	Bicarbonate ion	[HCO3]-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
36	Carbonate ion	[CO3]2-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
37	Carbon, inorganic, dissolved	DIC	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
38	Aragonite saturation state	Omega Arg		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
39	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:

390 data points

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