Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

McMahon, Ashly; Santos, Isaac R; Cyronak, Tyler; Eyre, Bradley D (2014): Hysteresis between coral reef calcification and the seawater aragonite saturation state. PANGAEA, https://doi.org/10.1594/PANGAEA.833887, Supplement to: McMahon, A et al. (2013): Hysteresis between coral reef calcification and the seawater aragonite saturation state. Geophysical Research Letters, 40(17), 4675-4679, https://doi.org/10.1002/grl.50802

Always quote above citation when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

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.
Further details:
Lavigne, Héloise; Epitalon, Jean-Marie; Gattuso, Jean-Pierre (2014): seacarb: seawater carbonate chemistry with R. R package version 3.0. https://cran.r-project.org/package=seacarb
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):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Time of dayTime of daySantos, Isaac R
2Temperature, waterTemp°CSantos, Isaac R
3IrradianceEµmol/m2/sSantos, Isaac R
4Alkalinity, totalATmmol(eq)/lSantos, Isaac RPotentiometric titration
5Alkalinity, total fluxAT fluxmmol(eq)/m2/hSantos, Isaac R
6Net calcification rate of calcium carbonateNC CaCO3µmol/cm2/hSantos, Isaac Recosystem
7Net productionNPmmol/m2/hSantos, Isaac Recosystem
8Aragonite saturation stateOmega ArgSantos, Isaac R
9pHpHSantos, Isaac RPotentiometricNBS scale
10Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmSantos, Isaac RCalculated using CO2SYS
11Carbon dioxide, air-sea fluxCO2 air-sea fluxmmol/m2/hSantos, Isaac R
12Nitrate and Nitrite[NO3]- + [NO2]-µmol/lSantos, Isaac RSpectrophotometric
13Phosphate[PO4]3-µmol/lSantos, Isaac RSpectrophotometric
14Ammonium[NH4]+µmol/lSantos, Isaac R
15SalinitySalSantos, Isaac R
16Carbonate system computation flagCSC flagYang, YanCalculated using seacarb after Nisumaa et al. (2010)
17pHpHYang, YanCalculated using seacarb after Nisumaa et al. (2010)total scale
18Carbon dioxideCO2µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
19Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
20Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
21Bicarbonate ion[HCO3]-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
22Carbonate ion[CO3]2-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
23Carbon, inorganic, dissolvedDICµmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
24Alkalinity, totalATµmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
25Aragonite saturation stateOmega ArgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
26Calcite saturation stateOmega CalYang, YanCalculated using seacarb after Nisumaa et al. (2010)
Size:
1204 data points

Download Data

Download dataset as tab-delimited text (use the following character encoding: )

View dataset as HTML