Seawater carbonate chemistry and marine phytoplankton and bacterial metabolism during a bloom, supplement to: Huang, Yibin; Liu, Xin; Laws, Edward A; Chen, Bingzhang; Li, Yan; Xie, Yuyuan; Wu, YaPing; Gao, Kunshan; Huang, Bangqin (2018): Effects of increasing atmospheric CO2 on the marine phytoplankton and bacterial metabolism during a bloom: A coastal mesocosm study. Science of the Total Environment, 633, 618-629

• Main Authors: Huang, Yibin, Liu, Xin, Laws, Edward A, Chen, Bingzhang, Li, Yan, Xie, Yuyuan, Wu, YaPing, Gao, Kunshan, Huang, Bangqin
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2018
• Subjects: Biomass/Abundance/Elemental composition; Coast and continental shelf; Entire community; Field experiment; Mesocosm or benthocosm; North Pacific; Other metabolic rates; Pelagos; Primary production/Photosynthesis; Respiration; Temperate; Type; Treatment; Day of experiment; Chlorophyll a; Chlorophyll a, standard deviation; Bacteria, heterotrophic; Bacteria, heterotrophic, standard deviation; Gross primary production of carbon dioxide; Gross primary production of carbon dioxide, standard deviation; Light-saturated productivity index carbon/chlorophyll a; Light-saturated productivity index, standard deviation; Respiration rate, carbon dioxide; Respiration rate, carbon dioxide, standard deviation; Bacterial production; Bacterial production, standard deviation; Bacteria, growth efficiency; Bacteria, growth efficiency, standard deviation; Bacteria, carbon demand; Bacteria, carbon demand, standard deviation; Net community production of carbon dioxide; Net community production of carbon dioxide, standard deviation; Temperature, water; Salinity; Carbon, inorganic, dissolved; pH; Partial pressure of carbon dioxide water at sea surface temperature wet air; Phosphate; Silicate; Carbonate system computation flag; Carbon dioxide; Fugacity of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbonate ion; Alkalinity, total; Aragonite saturation state; Calcite saturation state; Experiment; Calculated using seacarb after Nisumaa et al. 2010; Ocean Acidification International Coordination Centre OA-ICC; Pacific; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.901015; https://doi.pangaea.de/10.1594/PANGAEA.901015

Increases of atmospheric CO2 concentrations due to human activity and associated effects on aquatic ecosystems are recognized as an environmental issue at a global scale. Growing attention is being paid to CO2 enrichment effects under multiple stresses or fluctuating environmental conditions in order to extrapolate from laboratory-scale experiments to natural systems. We carried out a mesocosm experiment in coastal water with an assemblage of three model phytoplankton species and their associated bacteria under the influence of elevated CO2 concentrations. Net community production and the metabolic characteristics of the phytoplankton and bacteria were monitored to elucidate how these organisms responded to CO2 enrichment during the course of the algal bloom. We found that CO2 enrichment (1000 μatm) significantly enhanced gross primary production and the ratio of photosynthesis to chlorophyll a by approximately 38% and 39%, respectively, during the early stationary phase of the algal bloom. Although there were few effects on bulk bacterial production, a significant decrease of bulk bacterial respiration (up to 31%) at elevated CO2 resulted in an increase of bacterial growth efficiency. The implication is that an elevation of CO2 concentrations leads to a reduction of bacterial carbon demand and enhances carbon transfer efficiency through the microbial loop, with a greater proportion of fixed carbon being allocated to bacterial biomass and less being lost as CO2. The contemporaneous responses of phytoplankton and bacterial metabolism to CO2 enrichment increased net community production by about 45%, an increase that would have profound implications for the carbon cycle in coastal marine ecosystems. : 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.