Global distributions of acetone in the upper troposphere from MIPAS spectra
Global distributions of acetone in the upper troposphere from MIPAS spectra
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DOI：
10.5194/acp-12-757-2012
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发表时间：
2010-10
影响因子：
6.3
通讯作者：
D. Moore;J. Remedios;A. Waterfall
中科院分区：
文献类型：
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作者：
D. Moore;J. Remedios;A. Waterfall
抽象的。这项研究报告了对流层上层 (UT) 丙酮 (C 3 H 6 O) 的首次全球测量。剖面图是通过 Envisat 上的被动大气探测迈克尔逊干涉仪 (MIPAS) 于 2003 年 8 月进行的测量获得的 9 公里至 15 公里处的剖面图。在 180 hPa 至 350 hPa 之间，每个剖面图的误差低于 40%。我们报告了半球丙酮体积混合比 (VMR) 的巨大差异，北半球 (NH) 中纬度 UT 的平均浓度最高，在 1000 pptv 和 1600 pptv 之间，最大值高达 2300 pptv。我们的结果显示丙酮相对于二氧化碳有显着增强，特别是在欧洲 (7 pptv ppbv -1 )，证实了飞机研究。欧洲这些高值的十天向后轨迹显示，北美上空的气流 (56%) 和亚洲最南端的气流贡献了 25%。在格陵兰岛、西伯利亚和非洲生物质燃烧地区也观察到丙酮含量增加。区域分布表明，丙酮 VMR 随着海拔的升高（压力降低）而迅速降低，特别是在北半球地区。在南纬 45° 的极地，丙酮 VMR 与 400 pptv 至 500 pptv 之间的平均 VMR 保持相当一致。在 9 公里处的 5 天平均值中，北纬 45° 极地的北半球 VMR 始终高于南半球南半球极地 45° 的观测值，高出 750 pptv 到 1100 pptv。结果表明，中纬度和输送过程对丙酮夏季分布有明显影响。
Abstract. This study reports the first global measurements of acetone (C 3 H 6 O) in the upper troposphere (UT). Profiles were obtained between 9 km and 15 km from measurements made by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) onboard Envisat in August 2003. Errors per profile are lower than 40 % between 180 hPa and 350 hPa. We report strong hemispheric differences in the acetone volume mixing ratios (VMRs), with average concentrations highest in the Northern Hemisphere (NH) mid-latitude UT, between 1000 pptv and 1600 pptv with maxima up to 2300 pptv. Our results show a strong enhancement of acetone relative to CO, particularly over Europe (7 pptv ppbv −1 ), confirming aircraft studies. Ten-day backward trajectories from these high European values show strong contributions from air flows over North America (56 %) and 25 % from Southernmost Asia. Enhanced acetone is also observed over Greenland, Siberia and biomass burning regions of Africa. Zonal distributions show that acetone VMRs decrease rapidly with increasing altitude (decreasing pressure), particularly in the NH. Poleward of 45° S, acetone VMRs remain fairly consistent with average VMRs between 400 pptv and 500 pptv. In 5-day averages at 9 km, NH VMRs poleward of 45° N are consistently higher than Southern Hemisphere observations poleward of 45° S, by between 750 pptv and 1100 pptv. The results show a clear influence of mid-latitude and transport processes on the acetone summertime distribution.