Eco-chemical mechanisms govern phytoplankton emissions of dimethylsulfide in global surface waters

作     者：Xuwei Deng Jun Chen Lars-Anders Hansson Xia Zhao Ping Xie Xuwei Deng;Jun Chen;Lars-Anders Hansson;Xia Zhao;Ping Xie

作者机构：Donghu Experimental Station of Lake EcosystemsState Key Laboratory of Freshwater Ecology and Biotechnology of ChinaInstitute of HydrobiologyChinese Academy of Sciences Department of Biology/Aquatic EcologyLund University State Key Laboratory of Vegetation and Environmental ChangeInstitute of BotanyChinese Academy of Sciences Institute for Ecological Research and Pollution Control of Plateau LakesSchool of Ecology and Environmental ScienceYunnan University 

出 版 物：《National Science Review》 (国家科学评论(英文版))

年 卷 期：2021年第8卷第2期

页      面：43-50页

核心收录：

学科分类：07[理学] 070602[理学-大气物理学与大气环境] 0706[理学-大气科学] 0713[理学-生态学] 

基　　金：supported by the National Natural Science Foundation of China (91951110) the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB31000000) 

主　　题：phytoplankton lake ecosystem biological regulation of global climate dimethylsulfide global surface oceans 

摘      要：The anti-greenhouse gas dimethylsulfide(DMS) is mainly emitted by algae and accounts for more than half of the total natural flux of gaseous sulfur to the atmosphere, strongly reducing the solar radiation and thereby the temperature on Earth. However, the relationship between phytoplankton biomass and DMS emissions is debated and inconclusive. Our study presents field observations from 100 freshwater lakes, in concert with data of global ocean DMS emissions, showing that DMS and algal biomass show a hump-shaped relationship, i.e. DMS emissions to the atmosphere increase up to a p H of about 8.1 but, at higher p H, DMS concentrations decline, likely mainly due to decomposition. Our findings from lake and ocean ecosystems worldwide were corroborated in experimental studies. This novel finding allows assessments of more accurate global patterns of DMS emissions and advances our knowledge on the negative feedback regulation of phytoplankton-driven DMS emissions on climate.