caa a22 4500 477061508 CHVBK 20180405111402.0 cr unu---uuuuu 170330e19961001xx s 000 0 eng 10.1007/BF00053788 doi (NATIONALLICENCE)springer-10.1007/BF00053788 TROPOZ II: Global distributions and budgets of methane and light hydrocarbons [Elektronische Daten] [C. Boissard, B. Bonsang, M. Kanakidou, G. Lambert] One hundred atmospheric samples were collected aboard the French Caravelle research aircraft, during the TROPOZ II experiment (January 1991). Tropospheric meridional distributions versus height were then derived from 70° N to 60° S and between 0.25 km and 11 km for methane, acetylene, ethane and propane. Areas of significant emissions were identified over northern latitudes with, for acetylene, maximum mixing ratios in the north (1.896 ppbv) more than 70 times higher than in background southern latitudes (0.025 ppbv). The influence of emissions from biomass burning was also obvious in the tropical boundary layer. Significant dynamic phenomena led to high mixing ratio zones above 8 or 10 km even for the most reactive hydrocarbons. For the first time, simultaneous assessment of global tropospheric contents of several light hydrocarbons was carried out. Using TROPOZ II data (January 1991) and STRATOZ III data (June 1984) collected by Rudolph (1988) during similar aircraft flights in 1988, the following tropospheric loads (in Tg-compound) were estimated, in January 1991 and June 1984, respectively: 1.1 and 0.4 for acetylene, 5.0 and 3.9 for ethane, 3.6 and 1.4 for propane and 3545 for methane in January only. According to our results, 40 to 65% of acetylene and alkanes are oxidized in the tropics. In addition, by computing the annual tropospheric sink of acetylene and alkanes, an evaluation of their annual global fluxes was performed. The figures are, in Tg-compound y-1 with an uncertainty of 80% to an order of magnitude, based on January and June data, respectively: 10 and 6.6 for acetylene, 16.3 and 17.6 for ethane and 52.3 and 26.5 for propane. Kluwer Academic Publishers, 1996 NMHC budget nationallicence tropospheric distributions nationallicence methane budget nationallicence TROPOZ II experiment nationallicence Boissard C. Centre des Faibles Radioactivités, Laboratoire mixte CNRS/CEA, Orme des merisiers/LMCE, Centre d'Etudes Nucléaires de Saclay, 91191, Gif-sur-Yvette Cedex, France aut Bonsang B. Centre des Faibles Radioactivités, Laboratoire mixte CNRS/CEA, Orme des merisiers/LMCE, Centre d'Etudes Nucléaires de Saclay, 91191, Gif-sur-Yvette Cedex, France aut Kanakidou M. Centre des Faibles Radioactivités, Laboratoire mixte CNRS/CEA, Orme des merisiers/LMCE, Centre d'Etudes Nucléaires de Saclay, 91191, Gif-sur-Yvette Cedex, France aut Lambert G. Centre des Faibles Radioactivités, Laboratoire mixte CNRS/CEA, Orme des merisiers/LMCE, Centre d'Etudes Nucléaires de Saclay, 91191, Gif-sur-Yvette Cedex, France aut Journal of Atmospheric Chemistry Kluwer Academic Publishers; gopher://gopher.wkap.nl 25/2(1996-10-01), 115-148 0167-7764 25:2<115 1996 25 10874 https://doi.org/10.1007/BF00053788 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00053788 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Boissard C. Centre des Faibles Radioactivités, Laboratoire mixte CNRS/CEA, Orme des merisiers/LMCE, Centre d'Etudes Nucléaires de Saclay, 91191, Gif-sur-Yvette Cedex, France aut NATIONALLICENCE 700 1- Bonsang B. Centre des Faibles Radioactivités, Laboratoire mixte CNRS/CEA, Orme des merisiers/LMCE, Centre d'Etudes Nucléaires de Saclay, 91191, Gif-sur-Yvette Cedex, France aut NATIONALLICENCE 700 1- Kanakidou M. Centre des Faibles Radioactivités, Laboratoire mixte CNRS/CEA, Orme des merisiers/LMCE, Centre d'Etudes Nucléaires de Saclay, 91191, Gif-sur-Yvette Cedex, France aut NATIONALLICENCE 700 1- Lambert G. Centre des Faibles Radioactivités, Laboratoire mixte CNRS/CEA, Orme des merisiers/LMCE, Centre d'Etudes Nucléaires de Saclay, 91191, Gif-sur-Yvette Cedex, France aut NATIONALLICENCE 773 0- Journal of Atmospheric Chemistry Kluwer Academic Publishers; gopher://gopher.wkap.nl/ 25/2(1996-10-01), 115-148 0167-7764 25:2<115 1996 25 10874 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer