Citation:

meps261111

Name: Seawater carbonate chemistry and processes during experiments with Emiliania huxleyi (TW1), 2003
Published: 2003
License: https://creativecommons.org/licenses/by/3.0/
Keywords: Calcification/Dissolution; Chromista; Emiliania huxleyi; Haptophyta; Laboratory experiment; Laboratory strains; Macro-nutrients; Not applicable; Pelagos; Phytoplankton; Primary production/Photosynthesis; Respiration; Single species

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Abstract:

Precipitation of calcium carbonate by phytoplankton in the photic oceanic layer is an important process regulating the carbon cycling and the exchange of CO2 at the ocean-atmosphere interface. Previous experiments have demonstrated that, under nutrient-sufficient conditions, doubling the partial pressure of CO2 (pCO2) in seawater-a likely scenario for the end of the century-can significantly decrease both the rate of calcification by coccolithophorids and the ratio of inorganic to organic carbon production. The present work investigates the effects of high pCO2 on calcification by the coccolithophore Emiliania huxleyi (Strain TW1) grown under nitrogen-limiting conditions, a situation that can also prevail in the ocean. Nitrogen limitation was achieved in NO3-limited continuous cultures renewed at the rate of 0.5 d-1 and exposed to a saturating light level. pCO2 was increased from 400 to 700 ppm and controlled by bubbling CO2-rich or CO2-free air into the cultures. The pCO2 shift has a rapid effect on cell physiology that occurs within 2 cell divisions subsequent to the perturbation. Net calcification rate (C) decreased by 25% and, in contrast to previous studies with N-replete cultures, gross community production (GCP) and dark community respiration (DCR) also decreased. These results suggest that increasing pCO2 has no noticeable effect on the calcification/photosynthesis ratio (C/P) when cells of E. huxleyi are NO3-limited.

Keyword(s):

Calcification/Dissolution; Chromista; Emiliania huxleyi; Haptophyta; Laboratory experiment; Laboratory strains; Macro-nutrients; Not applicable; Pelagos; Phytoplankton; Primary production/Photosynthesis; Respiration; Single species

Project(s):

European network of excellence for Ocean Ecosystems Analysis (EUR-OCEANS)

European Project on Ocean Acidification (EPOCA)

Ocean Acidification International Coordination Centre (OA-ICC)

Funding:

Seventh Framework Programme (FP7), grant/award no. 211384 : European Project on Ocean Acidification

Sixth Framework Programme (FP6), grant/award no. 511106 : European network of excellence for Ocean Ecosystems Analysis

Coverage:

Date/Time Start: 2001-10-29T09:00:00 * Date/Time End: 2001-11-24T08:00:00

Event(s):

Sciandra_etal_03 * Method/Device: Experiment (EXP)

Comment:

In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne and Gattuso, 2011) 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).

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Experimental treatment	Exp treat		Sciandra, Antoine
2	DATE/TIME	Date/Time				Geocode
3	Experiment day	Exp day	day	Sciandra, Antoine
4	Salinity	Sal		Sciandra, Antoine
5	Temperature, water	Temp	°C	Sciandra, Antoine
6	Radiation, photosynthetically active	PAR	µmol/m²/s	Sciandra, Antoine	Measured
7	Carbonate system computation flag	CSC flag		Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
8	pH	pH		Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)	Total scale
9	Alkalinity, total	AT	mmol(eq)/l	Sciandra, Antoine	Alkalinity, Gran titration (Gran, 1950)
10	Alkalinity, total	AT	µmol/kg	Sciandra, Antoine	Calculated	Original value in mEq/l, calculated using density
11	Carbon, inorganic, dissolved	DIC	µmol/kg	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
12	Carbon dioxide	CO2	µmol/kg	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
13	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Sciandra, Antoine	Measured
14	Fugacity of carbon dioxide (water) at sea surface temperature (wet air)	fCO2water_SST_wet	µatm	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
15	Bicarbonate ion	[HCO3]-	µmol/kg	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
16	Carbonate ion	[CO3]2-	µmol/kg	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
17	Aragonite saturation state	Omega Arg		Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
18	Calcite saturation state	Omega Cal		Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
19	Calcification rate of calcium carbonate per algae cell	Calc rate CaCO3	pmol/#/day	Sciandra, Antoine	Calculated, see reference(s)
20	Particulate organic carbon production per cell	POC prod/cell	pg/#/day	Sciandra, Antoine	Element analyser CHN, LECO
21	Particulate inorganic carbon production per cell	PIC prod/cell	pg/#/day	Sciandra, Antoine	Calculated

License:

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

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

941 data points

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