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Duarte, Carlos M; Krause-Jensen, Dorte (2018): Seawater carbonate chemistry and oxygen concentrations in the Greenland tidal pools. PANGAEA,, Supplement to: Duarte, CM; Krause-Jensen, D (2018): Greenland Tidal Pools as Hot Spots for Ecosystem Metabolism and Calcification. Estuaries and Coasts, 41(5), 1314-1321,

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The hypothesis that Arctic tidal pools provide environmental conditions suitable for calcifiers during summer, thereby potentially providing refugia for calcifiers in an acidifying Arctic Ocean, was tested on the basis of measurements conducted during two midsummers (2014 and 2016) in tidal pools colonised by a community composed of macroalgae and calcifiers in Disko Bay, Greenland (69° N). The tidal pools exhibited steep diurnal variations in temperature from a minimum of about 6 °C during the night to a maximum of almost 18 °C in the afternoon, while the temperature of the surrounding shore water was much lower, typically in the range 3 to 8 °C. O2 concentrations in the tidal pools were elevated relative to those in the adjacent open waters, by up to 11 mg O2 L−1, and exhibited heavy super-saturation (up to > 240%) during daytime emersion, reflecting intense and sustained photosynthetic rates of the tidal macroalgae. The intense photosynthetic activity of the seaweeds resulted in the drawdown of pCO2 concentrations in the pools during the day to levels down to average (±SE) values of 66 ± 18 ppm, and a minimum recorded value of 14.7 ppm, corresponding to pH levels as high as 8.69 ± 0.08, as compared to CO2 levels of 256 ± 4 and pH levels of 8.14 ± 0.01 in the water flooding the pools during high tide. The corresponding Ωarag reached 5.04 ± 0.49 in the pools as compared to 1.55 ± 0.02 in the coastal waters flooding the pools. Net calcification averaged 9.6 ± 5.6 μmol C/kg/h and was strongly and positively correlated with calculated net ecosystem production rates, which averaged 27.5 ± 8.6 μmol C/kg/h. Arctic tidal pools promote intense metabolism, creating conditions suitable for calcification during the Arctic summer, and can, therefore, provide refugia from ocean acidification to vulnerable calcifiers as extended periods of continuous light during summer are conducive to suitable conditions twice a day. Meroplankton larvae are exposed to ocean acidification until they settle in vegetated tidal pools, where they benefit from the protection offered by the “macroalgae-carbonate saturation state” interaction favouring calcification rates.
Arctic; Benthos; Calcification/Dissolution; Coast and continental shelf; Entire community; Field observation; Growth/Morphology; North Atlantic; Polar; Primary production/Photosynthesis; Rocky-shore community
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.
Median Latitude: 69.256333 * Median Longitude: -53.706000 * South-bound Latitude: 69.249000 * West-bound Longitude: -53.845000 * North-bound Latitude: 69.262000 * East-bound Longitude: -53.521000
Date/Time Start: 2014-06-17T17:30:00 * Date/Time End: 2014-06-19T10:15:00
Arctic_Station * Latitude: 69.249000 * Longitude: -53.521000 * Date/Time Start: 2014-06-21T00:00:00 * Date/Time End: 2014-06-24T00:00:00 * Device: Experiment (EXP)
Fortune_Bay * Latitude: 69.258000 * Longitude: -53.752000 * Date/Time Start: 2014-06-20T00:00:00 * Date/Time End: 2014-06-23T00:00:00 * Device: Experiment (EXP)
Kangarsuuk * Latitude: 69.262000 * Longitude: -53.845000 * Date/Time Start: 2016-06-15T00:00:00 * Date/Time End: 2016-06-17T00:00:00 * Device: Experiment (EXP)
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.
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEventDuarte, Carlos M
2TypeTypeDuarte, Carlos Mstudy
3SiteSiteDuarte, Carlos M
4DateDateDuarte, Carlos M
5Local TimeLocal timeDuarte, Carlos M
6OxygenO2µmol/lDuarte, Carlos M
7SalinitySalDuarte, Carlos M
8Temperature, waterTemp°CDuarte, Carlos M
9Local TimeLocal timeDuarte, Carlos MLast high tide
10DurationDurationhDuarte, Carlos Mafter high tide
11Alkalinity, totalATµmol/kgDuarte, Carlos M
12Carbon, inorganic, dissolvedDICµmol/kgDuarte, Carlos M
13pHpHDuarte, Carlos MCalculated using CO2SYStotal scale
14Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmDuarte, Carlos MCalculated using CO2SYS
15Aragonite saturation stateOmega ArgDuarte, Carlos MCalculated using CO2SYS
16DATE/TIMEDate/TimeDuarte, Carlos MGeocode
17Carbonate system computation flagCSC flagYang, YanCalculated using seacarb after Nisumaa et al. (2010)
18pHpHYang, YanCalculated using seacarb after Nisumaa et al. (2010)total scale
19Carbon dioxideCO2µmol/kgYang, 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)
21Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
22Bicarbonate ion[HCO3]-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
23Carbonate ion[CO3]2-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
24Aragonite saturation stateOmega ArgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
25Calcite saturation stateOmega CalYang, YanCalculated using seacarb after Nisumaa et al. (2010)
3351 data points

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