Data Description

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Citation:
Raitzsch, M et al. (2010): Incorporation of Mg and Sr in calcite of cultured benthic foraminifera (Heterostegina depressa and Ammonia tepida) and seawater carbonate chemistry, 2010. doi:10.1594/PANGAEA.758073,
Supplement to: Raitzsch, Markus; Dueñas-Bohórquez, Adriana; Reichart, Gerd-Jan; de Nooijer, Lennart Jan; Bickert, Torsten (2010): Incorporation of Mg and Sr in calcite of cultured benthic foraminifera: impact of calcium concentration and associated saturation state. Biogeosciences, 7(3), 869-881, doi:10.5194/bg-7-869-2010
Abstract:
We investigated the effect of the calcium concentration in seawater and thereby the calcite saturation state (omega) on the magnesium and strontium incorporation into benthic foraminiferal calcite under laboratory conditions. For this purpose individuals of the shallow-water species Heterostegina depressa (precipitating high-Mg calcite, symbiont-bearing) and Ammonia tepida (low-Mg calcite, symbiont-barren) were cultured in media under a range of [Ca2+], but similar Mg/Ca ratios. Trace element/Ca ratios of newly formed calcite were analysed with Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) and normalized to the seawater elemental composition using the equation DTE=(TE/Cacalcite)/(TE/Caseawater). The culturing study shows that DMg of A. tepida significantly decreases with increasing omega at a gradient of -4.3x10-5 per omega unit. The DSr value of A. tepida does not change with omega, suggesting that fossil Sr/Ca in this species may be a potential tool to reconstruct past variations in seawater Sr/Ca. Conversely, DMg of H. depressa shows only a minor decrease with increasing omega, while DSr increases considerably with omega at a gradient of 0.009 per omega unit. The different responses to seawater chemistry of the two species may be explained by a difference in the calcification pathway that is, at the same time, responsible for the variation in the total Mg incorporation between the two species. Since the Mg/Ca ratio in H. depressa is 50-100 times higher than that of A. tepida, it is suggested that the latter exhibits a mechanism that decreases the Mg/Ca ratio of the calcification fluid, while the high-Mg calcite forming species may not have this physiological tool. If the dependency of Mg incorporation on seawater [Ca2+] is also valid for deep-sea benthic foraminifera typically used for paleostudies, the higher Ca concentrations in the past may potentially bias temperature reconstructions to a considerable degree. For instance, 25 Myr ago Mg/Ca ratios in A. tepida would have been 0.2 mmol/mol lower than today, due to the 1.5 times higher [Ca2+] of seawater, which in turn would lead to a temperature underestimation of more than 2 °C.
Project(s):
European Project on Ocean Acidification (EPOCA) *
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Experimental treatment *Exp trtmRaitzsch, Markus *
2Identification *IDRaitzsch, Markus *
3Heterostegina depressa *H. depressaRaitzsch, Markus *Abundance estimate *
4Heterostegina depressa *H. depressaRaitzsch, Markus *Abundance estimate *
5Heterostegina depressa *H. depressaRaitzsch, Markus *Abundance estimate *
6Ammonia tepida *A. tepidaRaitzsch, Markus *Abundance estimate *
7Ammonia tepida *A. tepidaRaitzsch, Markus *Abundance estimate *
8Ammonia tepida *A. tepidaRaitzsch, Markus *Abundance estimate *
9Salinity *SalRaitzsch, Markus *
10Temperature, water *Temp°CRaitzsch, Markus *
11Alkalinity, total *ATµmol/kgRaitzsch, Markus *
12Alkalinity, total, standard deviation *AT std dev±Raitzsch, Markus *
13Total carbon *TCµmol/kgRaitzsch, Markus *
14Carbon, inorganic, total, standard deviation *TIC std dev±Raitzsch, Markus *Geo-Las 200Q 193 nm Excimerlaser (Lambda Physik) *
15Calcium *Ca2+mmol/kgRaitzsch, Markus *
16Calcium, standard deviation *Ca std dev±Raitzsch, Markus *
17Carbon dioxide *CO2µmol/kgRaitzsch, Markus *
18Carbon dioxide, standard deviation *CO2 std dev±Raitzsch, Markus *
19Calcite saturation state *SI CalRaitzsch, Markus *calculated *
20Omega calcite, standard deviation *Omega Cal std dev±Raitzsch, Markus *
21Carbonate system computation flag *CSC flagRaitzsch, Markus *Calculated using seacarb by Anne-Marin Nisumaa *
22pH *pHRaitzsch, Markus *Calculated using seacarb by Anne-Marin Nisumaa *Total scale
23Carbon dioxide *CO2µmol/kgRaitzsch, Markus *Calculated using seacarb by Anne-Marin Nisumaa *
24Partial pressure of Carbon dioxide (water) at sea surface temperature (wet air) *pCO2water_SST_wetµatmRaitzsch, Markus *Calculated using seacarb by Anne-Marin Nisumaa *
25Fugacity of Carbon dioxide (water) at sea surface temperature (wet air) *fCO2water_SST_wetµatmRaitzsch, Markus *Calculated using seacarb by Anne-Marin Nisumaa *
26Bicarbonate ion concentration *HCO3-µmol/kgRaitzsch, Markus *Calculated using seacarb by Anne-Marin Nisumaa *
27Carbonate ion concentration *CO3**2-µmol/kgRaitzsch, Markus *Calculated using seacarb by Anne-Marin Nisumaa *
28Aragonite saturation state *SI ArgRaitzsch, Markus *Calculated using seacarb by Anne-Marin Nisumaa *
29Calcite saturation state *SI CalRaitzsch, Markus *Calculated using seacarb by Anne-Marin Nisumaa *
30Magnesium/Calcium ratio *Mg/CaRaitzsch, Markus *Seawater
31Magnesium/Calcium ratio, standard deviation *Mg/Ca std dev±Raitzsch, Markus *Seawater
32Strontium/Calcium ratio *Sr/CaRaitzsch, Markus *Seawater
33Strontium/Calcium, standard deviation *Sr/Ca std dev±Raitzsch, Markus *Seawater
34Heterostegina depressa, magnesium/calcium ratio *H. depressa Mg/Cammol/molRaitzsch, Markus *
35Heterostegina depressa, magnesium/calcium ratio, standard deviation *H. depressa Mg/Ca std dev±Raitzsch, Markus *
36Ammonia tepida, magnesium/calcium ratio *A. tepida Mg/Cammol/molRaitzsch, Markus *
37Ammonia tepida, magnesium/calcium ratio, standard deviation *A. tepida Mg/Ca std dev±Raitzsch, Markus *
38Heterostegina depressa, incorporation, magnesium *H. depressa DMgRaitzsch, Markus *Geo-Las 200Q 193 nm Excimerlaser (Lambda Physik) *
39Heterostegina depressa, incorporation, magnesium, standard deviation *H. depressa DMg std dev±Raitzsch, Markus *
40Ammonia tepida, incorporation, magnesium *A. tepida DMgRaitzsch, Markus *Geo-Las 200Q 193 nm Excimerlaser (Lambda Physik) *
41Ammonia tepida, incorporation, magnesium, standard deviation *A. tepida DMg std dev±Raitzsch, Markus *
42Heterostegina depressa, strontium/calcium ratio *H. depressa Sr/Cammol/molRaitzsch, Markus *
43Heterostegina depressa, strontium/calcium ratio, standard deviation *H. depressa Sr/Ca std dev±Raitzsch, Markus *
44Ammonia tepida, strontium/calcium ratio *A. tepida Sr/Cammol/molRaitzsch, Markus *
45Ammonia tepida, strontium/calcium ratio, standard deviation *A. tepida Sr/Ca std dev±Raitzsch, Markus *
46Heterostegina depressa, incorporation, strontium *H. depressa DSrRaitzsch, Markus *Geo-Las 200Q 193 nm Excimerlaser (Lambda Physik) *
47Heterostegina depressa, incorporation, strontium, standard deviation *H. depressa DSr std dev±Raitzsch, Markus *
48Ammonia tepida, incorporation, strontium *A. tepida DSrRaitzsch, Markus *Geo-Las 200Q 193 nm Excimerlaser (Lambda Physik) *
49Ammonia tepida, incorporation, strontium, standard deviation *A. tepida DSr std dev±Raitzsch, Markus *
License:
CC-BY Creative Commons Attribution 3.0 Unported
Size:
304 data points

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