Atmospheric perfluorocarbons.
Atmospheric perfluorocarbons.
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大气中的全氟化碳。
DOI：
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发表时间：
2003
影响因子：
11.4
通讯作者：
M. Shearer
中科院分区：
文献类型：
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作者：
M. Aslam;K. Khalil;R. Rasmussen;J. A. Culbertson;J. Prins;E. P. Grimsrud;M. Shearer
总的来说，一些温室气体的人为排放可能会导致与二氧化碳增加大致相同的全球变暖。在这些非二氧化碳温室气体中，最有效的是全氟化碳，它们在大气中的寿命非常长，可达10，000年至50，000年以上。我们报告了1978年至1997年这二十年间三种最丰富的全氟化碳--CF 4、C2 F6和C3 F8--在大气中的浓度，并描述了造成目前丰度和趋势的来源。我们发现，C2 F6和C3 F8是目前只有2.9和0.2 pptv，分别。CF 4是最丰富的全氟碳化合物，含量为74 pptv（1997年），其中约40 pptv来自自然排放，33 pptv来自铝制造业，1 pptv来自半导体行业。近年来，由于每吨铝的排放率大幅下降，CF 4的增长趋势有所减缓。排放系数下降的影响部分被半导体工业的产量增加和使用量增加所抵消。
Collectively, man-made emissions of a few greenhouse gases may cause about the same amount of global warming as increasing carbon dioxide. Among the most potent of these non-CO2 greenhouse gases are the perfluorocarbons that have extraordinarily long atmospheric lifetimes of 10,000 to more than 50,000 yr. We report atmospheric concentrations over two decades, between 1978 and 1997, of the three most abundant perfluorocarbons--CF4, C2F6, and C3F8--and delineate the sources that account for the present abundances and trends. We show that C2F6 and C3F8 are present at only 2.9 and 0.2 pptv, respectively. CF4 is the most abundant perfluorocarbon at 74 pptv (in 1997) of which about 40 pptv are from natural emissions, 33 pptv from aluminum manufacturing, and 1 pptv from the semiconductor industry. The increasing trend of CF4 has slowed in recent years due to the major reductions in the emission rate per ton of aluminum produced. The effect of the falling emission factor is partially offset by increased production and increasing use by the semiconductor industry.