Citation:

grl.50802

Name: Hysteresis between coral reef calcification and the seawater aragonite saturation state
Published: 2013
License: https://creativecommons.org/licenses/by/3.0/
Keywords: Benthos; Calcification/Dissolution; Charophyta; Coast and continental shelf; Entire community; Field observation; Primary production/Photosynthesis; Rocky-shore community; South Pacific; Temperate

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Abstract:

Some predictions of how ocean acidification (OA) will affect coral reefs assume a linear functional relationship between the ambient seawater aragonite saturation state (Omega a) and net ecosystem calcification (NEC). We quantified NEC in a healthy coral reef lagoon in the Great Barrier Reef during different times of the day. Our observations revealed a diel hysteresis pattern in the NEC versus Omega a relationship, with peak NEC rates occurring before the Omega a peak and relatively steady nighttime NEC in spite of variable Omega a. Net ecosystem production had stronger correlations with NEC than light, temperature, nutrients, pH, and Omega a. The observed hysteresis may represent an overlooked challenge for predicting the effects of OA on coral reefs. If widespread, the hysteresis could prevent the use of a linear extrapolation to determine critical Omega a threshold levels required to shift coral reefs from a net calcifying to a net dissolving state.

Keyword(s):

Benthos; Calcification/Dissolution; Charophyta; Coast and continental shelf; Entire community; Field observation; Primary production/Photosynthesis; Rocky-shore community; South Pacific; Temperate

Further details:

Lavigne, Héloïse; Epitalon, Jean-Marie; Gattuso, Jean-Pierre (2014): seacarb: seawater carbonate chemistry with R. R package version 3.0 [webpage]. https://cran.r-project.org/package=seacarb

Project(s):

Ocean Acidification International Coordination Centre (OA-ICC)

Coverage:

Latitude: -23.450000 * Longitude: 151.916670

Event(s):

Heron_Island * Latitude: -23.450000 * Longitude: 151.916670

Comment:

In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne et al, 2014) 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 is 2014-07-08.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Time of day	Time of day		Santos, Isaac R
2	Temperature, water	Temp	°C	Santos, Isaac R
3	Irradiance	E	µmol/m²/s	Santos, Isaac R
4	Alkalinity, total	AT	mmol(eq)/l	Santos, Isaac R	Potentiometric titration
5	Alkalinity, total, flux	AT flux	mmol(eq)/m²/h	Santos, Isaac R
6	Net calcification rate of calcium carbonate	NC CaCO3	µmol/cm²/h	Santos, Isaac R		ecosystem
7	Net production	NP	mmol/m²/h	Santos, Isaac R		ecosystem
8	Aragonite saturation state	Omega Arg		Santos, Isaac R
9	pH	pH		Santos, Isaac R	Potentiometric	NBS scale
10	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Santos, Isaac R	Calculated using CO2SYS
11	Carbon dioxide, air-sea, flux	CO2 air-sea flux	mmol/m²/h	Santos, Isaac R
12	Nitrate and Nitrite	[NO3]- + [NO2]-	µmol/l	Santos, Isaac R	Spectrophotometric
13	Phosphate	[PO4]3-	µmol/l	Santos, Isaac R	Spectrophotometric
14	Ammonium	[NH4]+	µmol/l	Santos, Isaac R
15	Salinity	Sal		Santos, Isaac R
16	Carbonate system computation flag	CSC flag		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
17	pH	pH		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)	total scale
18	Carbon dioxide	CO2	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
19	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)
20	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)
21	Bicarbonate ion	[HCO3]-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
22	Carbonate ion	[CO3]2-	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
23	Carbon, inorganic, dissolved	DIC	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
24	Alkalinity, total	AT	µmol/kg	Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
25	Aragonite saturation state	Omega Arg		Yang, Yan	Calculated using seacarb after Nisumaa et al. (2010)
26	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:

1204 data points

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