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 

机构地区：[1]Donghu Experimental Station of Lake Ecosystems,State Key Laboratory of Freshwater Ecology and Biotechnology of China,Institute of Hydrobiology,Chinese Academy of Sciences,Wuhan 430072,China [2]Department of Biology/Aquatic Ecology,Lund University,S-22362 Lund,Sweden [3]State Key Laboratory of Vegetation and Enviro nm ental Change,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China [4]Institute for Ecological Research and Pollution Control of Plateau Lakes,School of Ecology and Envir on mental Science,Yunnan University,Kunming 650091,China

出　　处：《National Science Review》2021年第2期38-45,共8页国家科学评论（英文版）

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

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.

关 键 词：PHYTOPLANKTON lake ecosystem biological regulation of global climate DIMETHYLSULFIDE global surface oceans 

分 类 号：X16[环境科学与工程—环境科学] X173