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Abstract. A mesocosm experiment was conducted in Wuyuan Bay (Xiamen), China, toinvestigate the effects of elevated p CO2 on the phytoplanktonspecies Phaeodactylum tricornutum (P. tricornutum),Thalassiosira weissflogii (T. weissflogii) andEmiliania huxleyi (E. huxleyi) and their production abilityof dimethylsulfide (DMS), dimethylsulfoniopropionate (DMSP), as well as fourhalocarbon compounds, bromodichloromethane ( CHBrCl2 ), methyl bromide( CH3Br ), dibromomethane ( CH2Br2 ) and iodomethane( CH3I ). Over a period of 5 weeks, P. tricornuntumoutcompeted T. weissflogii and E. huxleyi, comprising morethan 99 % of the final biomass. During the logarithmic growth phase(phase I), mean DMS concentration in high p CO2 mesocosms(1000  µ atm) was 28 % lower than that in low p CO2 mesocosms (400  µ atm). Elevated p CO2 led to a delay inDMSP-consuming bacteria concentrations attached to T. weissflogiiand P. tricornutum and finally resulted in the delay of DMSconcentration in the high p CO2 treatment. Unlike DMS, the elevated p CO2 did not affect DMSP production ability of T. weissflogii or P. tricornuntum throughout the 5-week culture. Apositive relationship was detected between CH3I and T. weissflogii and P. tricornuntum during the experiment, and therewas a 40 % reduction in mean CH3I concentration in the high p CO2 mesocosms. CHBrCl2 , CH3Br , and CH2Br2 concentrations did not increase with elevated chlorophyll a (Chl a) concentrations compared with DMS(P) and CH3I , andthere were no major peaks both in the high p CO2 or low p CO2 mesocosms. In addition, no effect of elevated p CO2 was identified for any of the three bromocarbons.

biogeosciences

Effect of elevated &amp;lt;i&amp;gt;p&amp;lt;/i&amp;gt;CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; on trace gas production during an ocean acidification mesocosm experiment