Accelerating growth of HFC-227ea (1,1,1,2,3,3,3-heptafluoropropane) in the atmosphere
Accelerating growth of HFC-227ea (1,1,1,2,3,3,3-heptafluoropropane) in the atmosphere
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DOI：
10.5194/acp-10-5903-2010
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发表时间：
2010-07
影响因子：
6.3
通讯作者：
J. Laube;P. Martinerie;E. Witrant;T. Blunier;J. Schwander;C. Brenninkmeijer;T. Schuck;M. Bolder;T. Röckmann;C. Veen;H. Bönisch;A. Engel;G. Mills;M. Newland;D. Oram;C. Reeves;W. Sturges
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文献类型：
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作者：
J. Laube;P. Martinerie;E. Witrant;T. Blunier;J. Schwander;C. Brenninkmeijer;T. Schuck;M. Bolder;T. Röckmann;C. Veen;H. Bönisch;A. Engel;G. Mills;M. Newland;D. Oram;C. Reeves;W. Sturges
我们报告的第一次测量1，1，1，2，3，3，3-七氟丙烷（HFC-227 ea），一种臭氧消耗化合物的替代品，在空气样品中来自大气的偏远地区，并提出证据，其加速增长。观测到的混合比范围从深积雪空气中的0.01 ppt以下到当前北方中纬度对流层上层的0.59 ppt。在格陵兰收集的雪空气样本被用来重建大气丰度的历史。按年计算，增长率从2000年的每年0.029个百分点加速到2007年的每年0.056个百分点。对流层上层的空气样本提供了持续增长的证据，直到2009年底。此外，我们计算了平流层的寿命为370年，从测量的空气样本收集在船上的高空飞机和气球。排放量估计数是根据重建的大气趋势确定的，表明目前“自下而上”的2005年全球排放量估计数过高，高出三倍。
We report the first measurements of 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea), a substitute for ozone depleting compounds, in air samples originating from remote regions of the atmosphere and present evidence for its accelerating growth. Observed mixing ratios ranged from below 0.01 ppt in deep firn air to 0.59 ppt in the current northern mid-latitudinal upper troposphere. Firn air samples collected in Greenland were used to reconstruct a history of atmospheric abundance. Year-on-year increases were deduced, with acceleration in the growth rate from 0.029 ppt per year in 2000 to 0.056 ppt per year in 2007. Upper tropospheric air samples provide evidence for a continuing growth until late 2009. Furthermore we calculated a stratospheric lifetime of 370 years from measurements of air samples collected on board high altitude aircraft and balloons. Emission estimates were determined from the reconstructed atmospheric trend and suggest that current "bottom-up" estimates of global emissions for 2005 are too high by a factor of three.