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Updated global compilation of coccolithophore calcification measurements from unperturbed water samples including ancillary data

This database expands the Poulton et al., 2018 (doi:10.1594/PANGAEA.888182) database of pelagic calcium carbonate (CP) rate measurements from isotopic tracer uptake in incubated discrete water samples, as discussed in Daniels et al., 2018 (doi:10.5194/essd-10-1859-2018), and accompanies Marsh et al. (in prep.). The database now includes more CP (new data n = 400; complete database n = 3165), net primary production rate (PP) (new data n = 399; complete database n = 3150), total coccolithophore cell counts (new data n = 240; complete database n = 1512), and Emiliania huxleyi cell counts (new data n = 27; complete database n = 612). This expanded database maintains the record of data, including the principal investigator, expedition, OS region, doi reference (where available), collection date and year, sample ID, latitude, longitude, sampling and light depth, and method of measuring CP. We further expand the Poulton et al. (2018) data collection by including ancillary and environmental data, including: optical depth (OD, n = 3165), pHtotal (hereinafter referred to as pHT, n = 398), temperature (n = 1160), salinity (n = 1161), and the concentrations of chlorophyll a (n = 1363), NOx (NO3 or the sum of NO3 + NO2, n = 1161), silicic acid (Si(OH)4, n= 1156), phosphate (PO4, n = 1232), dissolved inorganic carbon (DIC, n = 318), total alkalinity (TA, n = 307), bicarbonate ion concentration (n = 349), and carbonate ion concentration (n = 352). All data was matched to CP, sample bottle identifiers (Niskin bottle numbers), and/or sampling depth values. This global database (81 °N - 64 °S, 132 °E - 174 °W) now covers expeditions and upper ocean measurements (0 - 193 m) from 1989 to 2024. Global in-situ geolocated data spanning time is valuable for modelling, satellite algorithms, and capturing calcium carbonate production in the global ocean. This expanded database, including the environmental, nutrient, chlorophyll a, and carbonate chemistry data, also allows for analysis of factors influencing calcium carbonate production on a global scale. This data amalgamation contributes to understanding the biogeochemistry of the oceans, global carbon cycle, and ocean acidification.

Environmental costal monitoring of seawater calcium in 2015-2017, South-West Baltic Sea

This data set presents data from parallel environmental monitoring from the same 3 Baltic Sea sites using Star-Oddi mini CTD loggers. Salinity data was converted to calcium ion concentrations using published conversion factors for the Baltic Sea. This monitoring was implemented to understand natural levels of seawater calcium in South-West Baltic mussel reefs and how this impacts calcification.

Environmental coastal monitoring of carbonate chemistry parameters in 2015-2017, South-West Baltic Sea

This data set presents data from environmental coastal monitoring of carbonate chemistry parameters at the same 3 sites in the Baltic Sea over the course of 2 years. Poisoned water samples were analysed in laboratories in GEOMAR, Kiel and IOW, Rostock to understand the variation in carbonate chemistry and salinity and how this correlates with calcification rates of mussels in the field. These carbonate chemistry parameters were used to calculate aragonite saturation state (omega) and the ratio of calcification substrate to inhibitor (ESIR) to describe the environmental conditions relevant for calcification along the Baltic Sea salinity gradient.

Mussel calcification in the Baltic Sea under natural and manipulated carbonate chemistry parameters

Laboratory experiments were performed measuring calcification rates in Baltic Sea mussel at various salintiies, bicarbonate and calcium ion concentrations. Predictors of calcification were calculated and correlated with calcification rates. Field monitoring of carbonate chemistry, salinity and temperature was conducted and correlated with field calcification rates in southwest Baltic Sea mussel reefs.

Field monitoring of calcification rates of Mytilus mussels in 2016-2017, South-West Baltic Sea

This data set presents data from field monitoring of calcification rates across 15 months from 3 sites in the South-West Baltic Sea (Kiel fjord, Ahrenshoop and Usedom Island). 50 mussels were sampled from settlement structures at each location at 2 - 3 monthly intervals and shell length/mass were recorded over time to estimate calcification rates in the field related to environmental conditions.

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