Description: This dataset contains calculated carbonate chemistry parameters, including the concentrations of dissolved CO2, HCO3-, CO32- and dissolved inorganic carbon, the fugacity and partial pressure of CO2 and the saturation states of aragonite (Ωarag) and calcite (Ωcalc), for the alkalization mesocosms. Values were calculated from pH, total alkalinity, salinity and temperature measured between 17 April and 19 June 2024, using the seacarb package (Orr et al., 2018) in R (V. 4.3.2). Measured pH values, which refer to the NBS scale, were first converted to the total scale using the total proton activity coefficient fH of Takahashi et al. (1982), lowering pH by 0.12 to 0.13 units across the measured salinity and temperature range. Calculations used the carbonic acid dissociation constants of Lueker et al. (2000), the bisulfate dissociation constant of Dickson (1990), the hydrogen fluoride constant of Perez & Fraga (1987), total boron after Uppström (1974) and the aragonite and calcite solubility products of Mucci (1983), all evaluated at in situ temperature and salinity. The conversion from the NBS to the total scale carries a residual uncertainty of about 0.01 to 0.02 pH units, because the liquid junction potential between the dilute calibration buffers and seawater is not fully captured by fH. This propagates to an uncertainty of roughly 5 to 15 % in calculated pCO2 and a correspondingly smaller uncertainty in the saturation states.
Global identifier:
Doi(
"10.1594/PANGAEA.996219",
)
DataMeasurements(
DataMeasurements {
domain: Unspecified,
station: None,
measured_variables: [
"Alkalinity, total",
"Aragonite saturation state",
"Bicarbonate ion",
"Calcite saturation state",
"Carbon dioxide, dissolved",
"Carbon, inorganic, dissolved",
"Carbonate ion",
"Event label",
"Experiment day",
"Fugacity of carbon dioxide in seawater",
"Hydrogen ion, activity coefficient",
"Incubation type",
"Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)",
"Salinity",
"Sampling date/time, experiment",
"Temperature, water",
"Treatment",
"Type of study",
"pH",
"pH, NBS scale",
"pH, total scale",
],
methods: [],
},
)
Tags: Europäische Auster ? Fluorwasserstoff ? Meerestemperatur ? Bor ? Kohlenstoff ? Meerwasser ? Wasserstoff ? Kohlendioxid ? Temperatur ? Salzgehalt ? Gewässerzustand ? Studie ? Rückstand ? Verpackung ? Wasseraufbereitung ? ecotoxicology ? ocean alkalinity enhancement ?
Region: Helgoland
Bounding boxes: 7.888944° .. 7.888944° x 54.180327° .. 54.180327° 7.88458° .. 7.88458° x 54.18213° .. 54.18213°
License: Creative Commons Namensnennung 4.0 (Data access requires registration)
Language: Englisch/English
Issued: 2026-07-29
Modified: 2026-07-29
Last harvest: 13.08.2026 02:11
Time ranges: 2024-04-17 - 2025-03-12
Accessed 3 times.