Summary of the samples collected for this study. The symbol * indicates that there was at least one manual sampling interruption during the collection in order to avoid sampling during a change in the altitude or an abrupt turn. Teflon position indicates in which of the identical lines of the filter inlet system (up or low63) the Teflon filter has been used. Therefore, the polycarbonate filter has been collected in the other line. The given value of dust surface area is calculated by integrating the mineral dust surface area (total surface area multiplied by the fraction of particles in the categories Si rich, Si only, Al–Si rich and Ca rich in each bin). The number in the bracket after the dust surface area corresponds to the error of the magnitude calculated using Poisson counting statistics. Samples where there is not a value for the surface area of the mineral dust were not be analysed using SEM-EDS. In the last column, samples have been labelled according to the sampling location and air mass origin. O&G corresponds to the samples collected during the Oil and Gas flight. Downwind and upwind (of London) correspond to the samples collected within the boundary layer close to London. Continental Europe refers to the samples collected on the C024 flight, whose air masses have a higher influence from continental Europe. The C022_5 sample has been collected above the boundary layer.
| Sample | Date (2017) | Start time | End time | Pressure altitude (m) | Radar altitude (m) | Vol. PC (L) | Vol. tef. (L) | Teflon position | Dust area (μm2 cm−3) | % dust area | Description |
|---|---|---|---|---|---|---|---|---|---|---|---|
| C019_2 | 07/11th | 10:06 | 10:24 | 185 | 154 | 438 | — | — | 2.9 (1.1) | 17 | O&G |
| C019_4 | 07/11th | 11:19 | 19:37 | 330 | 303 | 286 | 160 | Up | — | — | O&G |
| C022_1 | 07/17th | 09:29 | 09:41* | 220 | 303 | 182 | 110 | Up | 9.8 (3.5) | 28 | Upwind |
| C022_2 | 07/17th | 10:23 | 10:39 | 648 | 714 | 335 | 149 | Low | — | — | Downwind |
| C022_3 | 07/17th | 10:48 | 11:03 | 478 | 534 | 335 | 255 | Up | — | — | Downwind |
| C022_4 | 07/17th | 11:10 | 11:18 | 331 | 392 | 286 | 84 | Low | — | — | Downwind |
| C022_5 | 07/17th | 11:58 | 12:10 | 1450 | 1490 | 258 | — | Up | 2.9 (1.4) | 33 | Above boundary layer |
| C024_1 | 07/19th | 12:59 | 13:10 | 202 | 160 | 171 | 97 | Up | — | — | Continental Europe |
| C024_2 | 07/19th | 13:28 | 14:03* | 351 | 250 | 696 | 257 | Low | 31.0 (5.7) | 45 | Continental Europe |
| C024_3 | 07/19th | 15:20 | 15:51 | 347 | 281 | 953 | 250 | Up | 14.6 (1.7) | 35 | Continental Europe |
| C025_1 | 07/20th | 12:51 | 13:09 | 943 | 837 | 425 | 189 | Low | 10.9 (2.9) | 41 | Upwind |
| C025_2 | 07/20th | 13:40 | 14:03* | 364 | 301 | 672 | 195 | Up | 5.1 (1.2) | 38 | Downwind |
| C025_3 | 07/20th | 14:11 | 14:35 | 76 | 38 | 625 | 260 | Low | 11.9 (2.8) | 37 | Downwind |
| C025_4 | 07/20th | 14:41 | 14:54 | 182 | 153 | 218 | 122 | Up | — | 31 | Downwind |