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Eco-chemical mechanisms govern phytoplankton emissions of dimethylsulfide in global surface waters
National Science Review ( IF 20.6 ) Pub Date : 2020-06-23 , DOI: 10.1093/nsr/nwaa140
Xuwei Deng 1 , Jun Chen 1 , Lars-Anders Hansson 2 , Xia Zhao 3 , Ping Xie 1
Affiliation  

Abstract
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 pH of about 8.1 but, at higher pH, 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.


中文翻译:

生态化学机制控制全球地表水中二甲基硫醚的浮游植物排放

摘要
抗温室气体二甲硫醚(DMS)主要由藻类排放,占大气中气态硫自然通量的一半以上,大大减少了太阳辐射,从而降低了地球温度。然而,浮游植物生物量与 DMS 排放之间的关系存在争议且尚无定论。我们的研究提供了来自 100 个淡水湖的实地观察结果,与全球海洋 DMS 排放数据相一致,表明 DMS 和藻类生物量呈驼峰状关系,即排放到大气中的 DMS 增加到约 8.1 的 pH 值,但在pH 值越高,DMS 浓度下降,可能主要是由于分解。我们在全球湖泊和海洋生态系统中的发现在实验研究中得到了证实。
更新日期:2020-06-23
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