Effects of ocean acidification and short-term light/temperature stress on biogenic dimethylated sulfur compounds cycling in the Changjiang River Estuary
Shan Jian A C D , Jing Zhang A B D , Hong-Hai Zhang A B and Gui-Peng Yang![https://orcid.org/0000-0002-0107-4568](/media/client/orcid_16x16.png)
A Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education/Institute for Advanced Ocean Study, Ocean University of China, Qingdao 266100, China.
B Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China.
C College of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin 300457, China.
D These authors contributed equally to this work.
E Corresponding author. Email: gpyang@mail.ouc.edu.cn
Environmental Chemistry 16(3) 197-211 https://doi.org/10.1071/EN18186
Submitted: 4 September 2018 Accepted: 21 March 2019 Published: 16 April 2019
Environmental context. Continuous anthropogenic CO2 emissions have led to an increase in seawater acidity, potentially affecting the growth of phytoplankton and their production of the climate-moderating biogenic gas, dimethyl sulfide. Our simulation experiments showed that ocean acidification, coupled with light and temperature changes, had a significant influence on dimethyl sulfide concentrations. This research provides fundamental data for predicting the biogeochemical cycle of dimethyl sulfide under various global change scenarios.
Abstract. Ocean acidification (OA) affects marine primary productivity and community structure. Therefore, OA may influence the biogeochemical cycles of volatile biogenic dimethyl sulfide (DMS), and its precursor dimethylsulfoniopropionate (DMSP) and photochemical oxidation product dimethyl sulfoxide (DMSO). A 23-day shipboard incubation experiment investigated the short-term response of the production and cycling of biogenic sulfur compounds to OA in the Changjiang River Estuary to understand the effects of OA on biogenic sulfur compounds. Phytoplankton abundance and community composition showed a marked difference at three different pH levels at the late stage of the experiment. Significant reductions in chlorophyll a (Chl-a), DMS, particulate DMSP (DMSPp) and dissolved DMSO (DMSOd) concentrations were identified under high CO2 levels. Moreover, minimal changes were observed in the productions of dissolved DMSP (DMSPd) and particulate DMSO (DMSOp) among the treatments. The ratios of DMS, total DMSP (DMSPt) and total DMSO (DMSOt) to Chl-a were not affected by a change in pH. Furthermore, the concentrations of DMS and DMSOd were closely related to the mean bacterial abundance at the three pH levels. Additional short-term (8 h) incubation experiments on the light and temperature effects showed that the influence of pH on the production of dimethylated sulfur compounds also depended on solar radiation and temperature. Under natural and UVB light, DMS photodegradation rates increased by 1.6 to 4.2 times at low pH levels. Thus, OA may lead to decreasing DMS concentrations in surface seawater. Light and temperature conditions also play important roles in the production and cycling of biogenic sulfur compounds.
Additional keywords: bacteria, phytoplankton, solar radiation, warming.
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