Notholt J, Kuang Z, Rinsland C P, Toon G C, Rex M, Jones N, Albrecht T, Deckelmann H, Krieg J, Weinzierl C, Bingemer H, Weller R, Schrems O
University of Bremen, D-28334 Bremen, Germany.
Science. 2003 Apr 11;300(5617):307-10. doi: 10.1126/science.1080320.
Carbonyl sulfide (COS) is considered to be a major source of the stratospheric sulfate aerosol during periods of volcanic quiescence. We measured COS at the tropical tropopause and find mixing ratios to be 20 to 50% larger than are assumed in models. The enhanced COS levels are correlated with high concentrations of biomass-burning pollutants like carbon monoxide (CO) and hydrogen cyanide (HCN). The analysis of backward trajectories and global maps of fire statistics suggest that biomass-burning emissions transported upward by deep convection are the source of the enhanced COS in the upper tropical troposphere.
在火山活动平静期，羰基硫（COS）被认为是平流层硫酸盐气溶胶的主要来源。我们在热带对流层顶测量了COS，发现其混合比比模型假设的高20%至50%。COS水平的升高与一氧化碳（CO）和氰化氢（HCN）等生物质燃烧污染物的高浓度相关。对后向轨迹和火灾统计全球地图的分析表明，通过深对流向上传输的生物质燃烧排放物是热带对流层上部COS增加的来源。
