Collaborative Research: Sphagnum-dominated Wetlands as Sources of Atmospheric Dimethyl Sulfide

硫磺气体是全球S循环的重要组成部分，它们增加了降水的酸度，影响了全球辐射平衡和气候。陆源生物S的作用及其对大气化学的影响一直是我们对S循环的主要认识问题。这些研究人员的初步研究表明，相对于其他湿地，以泥炭苔藓为主的北部泥炭地的植被区域排放了大量的二甲基硫(DMS)，这些湿地在气候变化中的变化可能会影响高纬度大气S循环。这项研究将测量湿地DMS的排放速率，以确定这些生境作为气体S来源的重要性，将讨论季节性影响、水文变化在影响DMS排放中的作用，以及DMS在湿地中的微生物形成和消耗。

Sulfur gases are important components of the global cycle of S. They contribute to the acidity of precipitation and they influence global radiation balance and climate. The role of terrestrial sources of biogenic S and their effect on atmospheric chemistry remain as major unanswered questions in our understanding of the natural S cycle. Preliminary studies by these investigators suggest that vegetated areas of northern peatlands dominated by Sphagnum mosses emit large quantities of dimethyl sulfide (DMS) relative to other wetlands, and that changes in these wetlands during climatic changes could affect the high latitude atmospheric S cycle. This study will measure the rates of emission of DMS from wetlands to determine the importance of these habitats as sources of gaseous S, will address seasonal effects, the role of hydrological changes in affecting DMS emissions, and the microbiological formation and consumption of DMS in wetlands.