Effect of elevated pCO 2 on trace gas production during an ocean acidification mesocosm experiment

Zhang, Sheng-Hui; Yu, Juan; Ding, Qiong-Yao; Yang, Gui-Peng; Gao, Kun-Shan; Zhang, Hong-Hai; Pan, Da-Wei

A mesocosm experiment was conducted in Wuyuan Bay (Xiamen), China, to investigate the effects of elevated inline-formulapinline-formulaCO2 on the phytoplankton species Phaeodactylum tricornutum (P. tricornutum), Thalassiosira weissflogii (T. weissflogii) and Emiliania huxleyi (E. huxleyi) and their production ability of dimethylsulfide (DMS), dimethylsulfoniopropionate (DMSP), as well as four halocarbon compounds, bromodichloromethane (inline-formulaCHBrCl2), methyl bromide (inline-formulaCH3Br), dibromomethane (inline-formulaCH2Br2) and iodomethane (inline-formulaCH3I). Over a period of 5 weeks, P. tricornuntum outcompeted T. weissflogii and E. huxleyi, comprising more than 99 % of the final biomass. During the logarithmic growth phase (phase I), mean DMS concentration in high inline-formulapinline-formulaCO2 mesocosms (1000 inline-formulaµatm) was 28 % lower than that in low inline-formulapinline-formulaCO2 mesocosms (400 inline-formulaµatm). Elevated inline-formulapinline-formulaCO2 led to a delay in DMSP-consuming bacteria concentrations attached to T. weissflogii and P. tricornutum and finally resulted in the delay of DMS concentration in the high inline-formulapinline-formulaCO2 treatment. Unlike DMS, the elevated inline-formulapinline-formulaCO2 did not affect DMSP production ability of T. weissflogii or P. tricornuntum throughout the 5-week culture. A positive relationship was detected between inline-formulaCH3I and T. weissflogii and P. tricornuntum during the experiment, and there was a 40 % reduction in mean inline-formulaCH3I concentration in the high inline-formulapinline-formulaCO2 mesocosms. inline-formulaCHBrCl2, inline-formulaCH3Br, and inline-formulaCH2Br2 concentrations did not increase with elevated chlorophyll inline-formulaa (Chl inline-formulaa) concentrations compared with DMS(P) and inline-formulaCH3I, and there were no major peaks both in the high inline-formulapinline-formulaCO2 or low inline-formulapinline-formulaCO2 mesocosms. In addition, no effect of elevated inline-formulapinline-formulaCO2 was identified for any of the three bromocarbons.

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Zhang, Sheng-Hui / Yu, Juan / Ding, Qiong-Yao / et al: Effect of elevated pCO2 on trace gas production during an ocean acidification mesocosm experiment. 2018. Copernicus Publications.

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