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. 2009 Jun 12;44(37):4678–4734. doi: 10.1016/j.atmosenv.2009.06.005

Fig. 2.

Fig. 2

Number of soot particles and ice particles per kg of fuel in contrails versus fuel sulphur content (FSC), behind various aircraft: ATTAS (squares), B737 (circles), and A310 (diamonds). The full symbols with dashed lines approximate the mean soot particle emission indices measured for the three aircraft in non-contrail plumes. The grey symbols with error bars denote the number of ice particles formed per kg of fuel burned in contrails for the B737 and the ATTAS (Schumann et al., 2002, Schumann, 2005).