Citation:

meps12250

Name: Seawater carbonate chemistry and Southern Ocean phytoplankton community characterization and iron uptake
Published: 2017-06-01
License: https://creativecommons.org/licenses/by/3.0/
Keywords: Antarctic; Antarctic; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (<20 L); Community composition and diversity; Entire community; Laboratory experiment; Micro-nutrients; Open ocean; Other metabolic rates; Pelagos; Polar; Primary production/Photosynthesis

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Abstract:

The rise in anthropogenic CO2 and the associated ocean acidification (OA) will change trace metal solubility and speciation, potentially altering Southern Ocean (SO) phytoplankton productivity and species composition. As iron (Fe) sources are important determinants of Fe bioavailability, we assessed the effect of Fe-laden dust versus inorganic Fe (FeCl3) enrichment under ambient and high pCO2 levels (390 and 900 μatm) in a naturally Fe-limited SO phytoplankton community. Despite similar Fe chemical speciation and net particulate organic carbon (POC) production rates, CO2-dependent species shifts were controlled by Fe sources. Final phytoplankton communities of both control and dust treatments were dominated by the same species, with an OA-dependent shift from the diatom Pseudo nitzschia prolongatoides towards the prymnesiophyte Phaeocystis antarctica. Addition of FeCl3 resulted in high abundances of Nitzschia lecointei and Chaetoceros neogracilis under ambient and high pCO2, respectively. These findings reveal that both the characterization of the phytoplankton community at the species level and the use of natural Fe sources are essential for a realistic projection of the biological carbon pump in the Fe-limited pelagic SO under OA. As dust deposition represents a more realistic scenario for the Fe-limited pelagic SO under OA, unaffected net POC production and dominance of P. antarctica can potentially weaken the export of carbon and silica in the future.

Keyword(s):

Antarctic; Antarctic; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (<20 L); Community composition and diversity; Entire community; Laboratory experiment; Micro-nutrients; Open ocean; Other metabolic rates; Pelagos; Polar; Primary production/Photosynthesis

Further details:

Gattuso, Jean-Pierre; Epitalon, Jean-Marie; Lavigne, Héloise; 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)

Coverage:

Latitude: -53.013330 * Longitude: 10.025000

Date/Time Start: 2012-01-21T00:00:00 * Date/Time End: 2012-01-21T00:00:00

Event(s):

Polar_front * Latitude: -53.013330 * Longitude: 10.025000 * Date/Time: 2012-01-21T00:00:00 * Method/Device: Experiment (EXP)

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		Trimborn, Scarlett		study
2	Treatment	Treat		Trimborn, Scarlett
3	Time in days	Time	days	Trimborn, Scarlett
4	Maximum photochemical quantum yield of photosystem II	Fv/Fm		Trimborn, Scarlett
5	Maximum photochemical quantum yield of photosystem II, standard deviation	Fv/Fm std dev	±	Trimborn, Scarlett
6	Nitrate	[NO3]-	µmol/l	Trimborn, Scarlett
7	Nitrate, standard deviation	NO3 std dev	±	Trimborn, Scarlett
8	Time point, descriptive	Time point		Trimborn, Scarlett
9	Abundance	Abund	%	Trimborn, Scarlett		Pseudonitzschia pro longatoides
10	Abundance, standard deviation	Abund std dev	±	Trimborn, Scarlett		Pseudonitzschia pro longatoides
11	Abundance	Abund	%	Trimborn, Scarlett		Nitz-schia leco intei
12	Abundance, standard deviation	Abund std dev	±	Trimborn, Scarlett		Nitz-schia leco intei
13	Abundance	Abund	%	Trimborn, Scarlett		Chaetoceros neo-gracilis
14	Abundance, standard deviation	Abund std dev	±	Trimborn, Scarlett		Chaetoceros neo-gracilis
15	Abundance	Abund	%	Trimborn, Scarlett		Fragilariopsis curta
16	Abundance, standard deviation	Abund std dev	±	Trimborn, Scarlett		Fragilariopsis curta
17	Abundance	Abund	%	Trimborn, Scarlett		Phaeocystis antarctica
18	Abundance, standard deviation	Abund std dev	±	Trimborn, Scarlett		Phaeocystis antarctica
19	Abundance	Abund	%	Trimborn, Scarlett		total diatoms
20	Abundance, standard deviation	Abund std dev	±	Trimborn, Scarlett		total diatoms
21	Growth rate	µ	1/day	Trimborn, Scarlett		P. antarctica
22	Growth rate, standard deviation	µ std dev	±	Trimborn, Scarlett		P. antarctica
23	Growth rate	µ	1/day	Trimborn, Scarlett		Diatom community
24	Growth rate, standard deviation	µ std dev	±	Trimborn, Scarlett		Diatom community
25	Cell density	Cells	#/ml	Trimborn, Scarlett		Pseudonitzschia pro longatoides
26	Cell density, standard deviation	Cells std dev	±	Trimborn, Scarlett		Pseudonitzschia pro longatoides
27	Cell density	Cells	#/ml	Trimborn, Scarlett		Nitz-schia leco intei
28	Cell density, standard deviation	Cells std dev	±	Trimborn, Scarlett		Nitz-schia leco intei
29	Cell density	Cells	#/ml	Trimborn, Scarlett		Chaetoceros neo-gracilis
30	Cell density, standard deviation	Cells std dev	±	Trimborn, Scarlett		Chaetoceros neo-gracilis
31	Cell density	Cells	#/ml	Trimborn, Scarlett		Fragilariopsis curta
32	Cell density, standard deviation	Cells std dev	±	Trimborn, Scarlett		Fragilariopsis curta
33	Cell density	Cells	#/ml	Trimborn, Scarlett		Phaeocystis antarctica
34	Cell density, standard deviation	Cells std dev	±	Trimborn, Scarlett		Phaeocystis antarctica
35	Cell density	Cells	#/ml	Trimborn, Scarlett		total diatoms
36	Cell density, standard deviation	Cells std dev	±	Trimborn, Scarlett		total diatoms
37	Net production of Carbon, organic, particulate	NP POC	µg/day	Trimborn, Scarlett
38	Particulate inorganic carbon per cell	PIC cell	pmol/#	Trimborn, Scarlett
39	Biogenic particulate silica/Carbon, organic, particulate	bPSi/POC		Trimborn, Scarlett
40	Biogenic particulate silica/Carbon, organic, particulate, standard deviation	bPSi/POC std dev	±	Trimborn, Scarlett
41	Iron uptake/Carbon, organic, particulate	Fe upt/POC		Trimborn, Scarlett
42	Iron uptake/Carbon, organic, particulate, standard deviation	Fe upt/POC std dev	±	Trimborn, Scarlett
43	Iron, dissolved	Fe diss	nmol/l	Trimborn, Scarlett		total
44	Iron, chemically labile	Fe lab	nmol/l	Trimborn, Scarlett		total
45	Iron, dissolved, inorganic	Fe´ diss	pmol/l	Trimborn, Scarlett
46	Side coefficient of dissolved Fe-complex ligands	Log alpha Fe3+Li		Trimborn, Scarlett
47	Ligand concentration	Ligands	nmol/l	Trimborn, Scarlett		determined according to Gerringa et al. (1995)
48	Ligand concentration, standard deviation	Ligands std dev	±	Trimborn, Scarlett		determined according to Gerringa et al. (1995)
49	Iron, inorganic, conditional stability constants	Log K Fe'L		Trimborn, Scarlett		determined according to Gerringa et al. (1995)
50	Iron, inorganic, conditional stability constants, standard deviation	Log K Fe'L std dev	±	Trimborn, Scarlett		determined according to Gerringa et al. (1995)
51	Ligand concentration	Ligands	nmol/l	Trimborn, Scarlett		determined according to van den Berg (1982)
52	Ligand concentration, standard deviation	Ligands std dev	±	Trimborn, Scarlett		determined according to van den Berg (1982)
53	Iron, inorganic, conditional stability constants	Log K Fe'L		Trimborn, Scarlett		determined according to van den Berg (1982)
54	Iron, inorganic, conditional stability constants, standard deviation	Log K Fe'L std dev	±	Trimborn, Scarlett		determined according to van den Berg (1982)
55	Temperature, water	Temp	°C	Trimborn, Scarlett
56	Salinity	Sal		Trimborn, Scarlett
57	Alkalinity, total	AT	µmol/kg	Trimborn, Scarlett		experimental bottles
58	Alkalinity, total, standard deviation	AT std dev	±	Trimborn, Scarlett		experimental bottles
59	Carbon, inorganic, dissolved	DIC	µmol/kg	Trimborn, Scarlett		experimental bottles
60	Carbon, inorganic, dissolved, standard deviation	DIC std dev	±	Trimborn, Scarlett		experimental bottles
61	pH	pH		Trimborn, Scarlett	Calculated using CO2SYS	experimental bottles, total scale
62	pH, standard deviation	pH std dev	±	Trimborn, Scarlett	Calculated using CO2SYS	experimental bottles, total scale
63	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Trimborn, Scarlett	Calculated using CO2SYS	experimental bottles
64	Partial pressure of carbon dioxide, standard deviation	pCO2 std dev	±	Trimborn, Scarlett	Calculated using CO2SYS	experimental bottles
65	Iron, dissolved	Fe diss	nmol/l	Trimborn, Scarlett		Abiotic control
66	Iron, dissolved, standard deviation	Fe diss std dev	±	Trimborn, Scarlett		Abiotic control
67	Iron, dissolved	Fe diss	nmol/l	Trimborn, Scarlett		experimental bottles
68	Iron, dissolved, standard deviation	Fe diss std dev	±	Trimborn, Scarlett		experimental bottles
69	Carbonate system computation flag	CSC flag		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
70	pH	pH		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	total scale
71	Carbon dioxide	CO2	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
72	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)
73	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)
74	Bicarbonate ion	[HCO3]-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
75	Carbonate ion	[CO3]2-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
76	Aragonite saturation state	Omega Arg		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
77	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)

Size:

4906 data points

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