Seawater carbonate chemistry and estuarine dissolved organic carbon export ...

• Main Authors: Simone, Michelle, Schulz, Kai, Oakes, Joanne, Eyre, Bradley D
• Format: Dataset
• Language: English
• Published: PANGAEA 2020
• Subjects: Benthos; Bottles or small containers/Aquaria <20 L; Coast and continental shelf; Entire community; Laboratory experiment; Other studied parameter or process; Primary production/Photosynthesis; Respiration; Soft-bottom community; South Pacific; Temperate; Temperature; Type; Treatment; Time point, descriptive; Replicates; DEPTH, sediment/rock; DEPTH, water; Surface area; Volume; Time in minutes; Salinity; Temperature, water; Oxygen saturation; Carbon, inorganic, dissolved; Carbon, organic, dissolved; pH; Respiration rate, oxygen; Respiration rate, oxygen, standard deviation; Net primary production of oxygen; Net primary production of oxygen, standard deviation; Gross primary production of oxygen; Gross primary production of oxygen, standard deviation; Production/respiration ratio; Production/respiration ratio, standard deviation; Carbon, inorganic, dissolved, flux; Carbon, inorganic, dissolved, flux, standard deviation; Carbon, organic, dissolved, flux; Carbon, organic, dissolved, flux, standard deviation; Nitrogen, inorganic, dissolved; Nitrogen, inorganic, dissolved, standard deviation; Temperature, water, standard deviation; pH, standard deviation; Partial pressure of carbon dioxide water at sea surface temperature wet air; Partial pressure of carbon dioxide, standard deviation; Bicarbonate ion; Bicarbonate ion, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Alkalinity, total; Pacific; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.930934; https://doi.pangaea.de/10.1594/PANGAEA.930934

Relative to their surface area, estuaries make a disproportionately large contribution of dissolved organic carbon (DOC) to the global carbon cycle, but it is unknown how this will change under a future climate. As such, the response of DOC fluxes from microbially dominated unvegetated sediments to individual and combined future climate stressors of temperature change (from delta −3 to delta +5 °C compared to ambient mean temperatures) and ocean acidification (OA, 2*current CO2 partial pressure, pCO2) was investigated ex situ. Warming alone increased sediment heterotrophy, resulting in a proportional increase in sediment DOC uptake; sediments became net sinks of DOC (3.5 to 8.8 mmol C/m**2/d) at warmer temperatures (delta +3 and delta +5 °C, respectively). This temperature response changed under OA conditions, with sediments becoming more autotrophic and a greater sink of DOC (up to 4* greater than under current pCO2 conditions). This response was attributed to the stimulation of heterotrophic bacteria with ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2021) 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 2021-04-30. ...