Seawater carbonate chemistry and chlorophyll a, primary productioin and algal community composition, supplement to: Liu, Nana; Tong, Shanying; Yi, Xiangqi; Li, Yan; Li, Zhenzhen; Miao, Hangbin; Wang, Tifeng; Li, Futian; Yan, Dong; Huang, Ruiping; Wu, YaPing; Hutchins, David A; Beardall, John; Dai, Minhan; Gao, Kunshan (2017): Carbon assimilation and losses during an ocean acidification mesocosm experiment, with special reference to algal blooms. Marine Environmental Research, 129, 229-235

• Main Authors: Liu, Nana, Tong, Shanying, Yi, Xiangqi, Li, Yan, Li, Zhenzhen, Miao, Hangbin, Wang, Tifeng, Li, Futian, Yan, Dong, Huang, Ruiping, Wu, YaPing, Hutchins, David A, Beardall, John, Dai, Minhan, Gao, Kunshan
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2017
• Subjects: Biomass/Abundance/Elemental composition; Coast and continental shelf; Community composition and diversity; Entire community; Field experiment; Mesocosm or benthocosm; North Pacific; Pelagos; Primary production/Photosynthesis; Temperate; Type; Species; Registration number of species; Uniform resource locator/link to reference; Treatment; Day of experiment; Replicate; Chlorophyll a; Cell density; Primary production of carbon per day; Respiration rate, carbon dioxide; Carbon, organic, particulate; Nitrogen, organic, particulate; Carbon, organic, particulate/Nitrogen, organic, particulate ratio; 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.890688; https://doi.pangaea.de/10.1594/PANGAEA.890688

A mesocosm experiment was conducted in Wuyuan Bay (Xiamen), China, to investigate the effects of elevated pCO2 on bloom formation by phytoplankton species previously studied in laboratory-based ocean acidification experiments, to determine if the indoor-grown species performed similarly in mesocosms under more realistic environmental conditions. We measured biomass, primary productivity and particulate organic carbon (POC) as well as particulate organic nitrogen (PON). Phaeodactylum tricornutum outcompeted Thalassiosira weissflogii and Emiliania huxleyi, comprising more than 99% of the final biomass. Mainly through a capacity to tolerate nutrient-limited situations, P. tricornutum showed a powerful sustained presence during the plateau phase of growth. Significant differences between high and low CO2 treatments were found in cell concentration, cumulative primary productivity and POC in the plateau phase but not during the exponential phase of growth. Compared to the low pCO2 (LC) treatment, POC increased by 45.8–101.9% in the high pCO2 (HC) treated cells during the bloom period. Furthermore, respiratory carbon losses of gross primary productivity were found to comprise 39–64% for the LC and 31–41% for the HC mesocosms (daytime C fixation) in phase II. Our results suggest that the duration and characteristics of a diatom bloom can be affected by elevated pCO2. Effects of elevated pCO2 observed in the laboratory cannot be reliably extrapolated to large scale mesocosms with multiple influencing factors, especially during intense algal blooms. : 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.