Citation:

PANGAEA.914329

Name: Seawater carbonate chemistry and diatom silica production in the Southern Ocean
Published: 2019
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Antarctic; Coast and continental shelf; Containers and aquaria (20-1000 L or < 1 m**2); Entire community; Fragilariopsis curta; Fragilariopsis cylindrus; Laboratory experiment; Other metabolic rates; Pelagos; Polar; Primary production/Photosynthesis; Proboscia truncata; Pseudonitzschia turgiduloides; Stellarima microtrias; Thalassiosira antarctica

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Abstract:

Diatoms, large bloom-forming marine microorganisms, build frustules out of silicate, which ballasts the cells and aids their export to the deep ocean. This unique physiology forges an important link between the marine silicon and carbon cycles. However, the effect of ocean acidification on the silicification of diatoms is unclear. Here we show that diatom silicification strongly diminishes with increased acidity in a natural Antarctic community. Analyses of single cells from within the community reveal that the effect of reduced pH on silicification differs among taxa, with several species having significantly reduced silica incorporation at CO2 levels equivalent to those projected for 2100. These findings suggest that, before the end of this century, ocean acidification may influence the carbon and silicon cycle by both altering the composition of the diatom assemblages and reducing cell ballasting, which will probably alter vertical flux of these elements to the deep ocean.

Keyword(s):

Antarctic; Coast and continental shelf; Containers and aquaria (20-1000 L or < 1 m**2); Entire community; Fragilariopsis curta; Fragilariopsis cylindrus; Laboratory experiment; Other metabolic rates; Pelagos; Polar; Primary production/Photosynthesis; Proboscia truncata; Pseudonitzschia turgiduloides; Stellarima microtrias; Thalassiosira antarctica

Supplement to:

Petrou, Katherina; Baker, Kirralee G; Nielsen, Daniel A; Hancock, Alyce M; Schulz, Kai Georg; Davidson, Andrew T (2019): Acidification diminishes diatom silica production in the Southern Ocean. Nature Climate Change, 9(10), 781-786, https://doi.org/10.1038/s41558-019-0557-y

Original version:

Petrou, Katherina (2019): Antarctic diatom silicification diminishes under ocean acidification. Australian Antarctic Data Centre, https://doi.org/10.26179/5c3e745a9b071

Further details:

Gattuso, Jean-Pierre; Epitalon, Jean-Marie; Lavigne, Héloïse; Orr, James C; Gentili, Bernard; Hagens, Mathilde; Hofmann, Andreas; Mueller, Jens-Daniel; Proye, Aurélien; Rae, James; Soetaert, Karline (2019): seacarb: seawater carbonate chemistry with R. R package version 3.2.12. https://CRAN.R-project.org/package=seacarb

Project(s):

Ocean Acidification International Coordination Centre (OA-ICC)

Coverage:

Latitude: -68.583330 * Longitude: 77.966670

Event(s):

Davis_Station_OA * Latitude: -68.583330 * Longitude: 77.966670 * Method/Device: Experiment (EXP)

Comment:

In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2019) 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 2020-03-18.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Type	Type		Petrou, Katherina		study
2	Species	Species		Petrou, Katherina
3	Abbreviation	Abbrev		Petrou, Katherina
4	Registration number of species	Reg spec no		Petrou, Katherina
5	Uniform resource locator/link to reference	URL ref		Petrou, Katherina		WoRMS Aphia ID
6	Identification	ID		Petrou, Katherina
7	Replicate	Repl		Petrou, Katherina
8	Biogenic silica	bSiO2	µmol	Petrou, Katherina		stand
9	Biogenic silica	bSiO2	µmol	Petrou, Katherina		incorp
10	Maximum photochemical quantum yield of photosystem II	Fv/Fm		Petrou, Katherina
11	Experiment day	Exp day	day	Petrou, Katherina
12	Number of cells	No cells	#	Petrou, Katherina
13	Silicification	Silicification	RFU	Petrou, Katherina
14	Chlorophyll a	Chl a	RFU	Petrou, Katherina
15	Cell biovolume	Cell biovol	µm³	Petrou, Katherina
16	Fugacity of carbon dioxide (water) at sea surface temperature (wet air)	fCO2water_SST_wet	µatm	Petrou, Katherina
17	pH	pH		Petrou, Katherina		total scale
18	Proton concentration	[H+]	nmol/l	Petrou, Katherina
19	Temperature, water	Temp	°C	Petrou, Katherina
20	Salinity	Sal		Petrou, Katherina
21	Nitrate and Nitrite	[NO3]- + [NO2]-	µmol/l	Petrou, Katherina
22	Phosphorus, reactive soluble	SRP	µmol/l	Petrou, Katherina
23	Silicate	Si(OH)4	µmol/l	Petrou, Katherina
24	Carbon, inorganic, dissolved	DIC	µmol/kg	Petrou, Katherina
25	Alkalinity, total	AT	µmol/kg	Petrou, Katherina
26	Carbonate system computation flag	CSC flag		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
27	Carbon dioxide	CO2	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
28	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)
29	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)
30	Bicarbonate ion	[HCO3]-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
31	Carbonate ion	[CO3]2-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
32	Alkalinity, total	AT	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
33	Aragonite saturation state	Omega Arg		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
34	Calcite saturation state	Omega Cal		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

104844 data points

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