TABLE 3.
Barometric pressure, ambient temperature, wind speed and thermal stress indices: WCT and FFT for the 499 ascents without oxygen support and 29 oxygen-supported ascents of 8K peaks we analyzed: number of ascents, means ± standard deviation (SD), coefficient of variation (CV%), minimum and maximum values.
| Ascent group and number | BP [hPa] | Temp [°C] | Wind [m⋅s–1] | WCT [°C] | FFT [min] |
| ME-noO2 (210) | 335 ± 2 (1%) min 329, max 340 |
−25 ± 3 (12%) min −33, max −19 |
12 ± 5 (43%) min 2, max 27 |
−40 ± 5 (13%) min −57, max −26 |
9 ± 4 (39%) min 2, max 22 |
| K2-noO2 (213) | 349 ± 2 (1%) min 336, max 354 |
−19 ± 3 (15%) min −36, max −14 |
12 ± 5 (40%) min 1, max 26 |
−33 ± 5(16%) min −60, max -19 |
17 ± 7 (39%) min 2, max 38 |
| wME-noO2 (1) | 331 | −33 | 26 | −59 | 2 |
| wK2-noO2 (1) | 334 | −40 | 5 | −55 | 5 |
| wH&H-noO2 (10) | 342 ± 4 (1%) min 337, max 348 |
−32 ± 4 (13%) min −37, max −27 |
41 ± 9 (21%) min 22, max 48 |
−60 ± 6 (10%) min −65, max −51 |
−2 ± 2 (109%) min −4, max 2 |
| wL&H-noO2 (50) | 362 ± 5 (1%) min 348, max 367 |
−29 ± 4 (14%) min −40, max −25 |
26 ± 10 (38%) min 12, max 46 |
−52 ± 6 (11%) min −64, max −41 |
2 ± 3 (141%) min −4, max 9 |
| wL&K-noO2 (14) | 358 ± 7 (2%) min 346, max 364 |
−38 ± 5 (12%) min −45, max −34 |
12 ± 4 (35%) min 7, max 18 |
−58 ± 6 (11%) min −67, max -51 |
4 ± 1 (24%) min 3, max 5 |
| w8000-yesO2 (29) | 333 ± 10 (3%) min 320, max 362 |
−36 ± 4 (11%) min −41, max −27 |
24 ± 14 (59%) min 5, max 46 |
−60 ± 6 (10%) min −69, max −47 |
2 ± 3 (166%) min -3, max 5 |
| wME-yesO2 (14) | 326 ± 3 (1%) min 320, max 331 |
−36 ± 4 (10%) min −41, max −31 |
36 ± 7 (18%) min 24, max 46 |
−64 ± 5 (7%) min −69, max -57 |
−1 ± 1 (275%) min −3, max 2 |
| wK2-yesO2 (9) | 334 | −40 | 5 | −55 | 5 |
ME-noO2, Everest non-oxygen non-winter ascents; K2-noO2, K2 non-oxygen non-winter ascents; wME-noO2, Everest non-oxygen winter ascents; wK2-noO2, K2 non-oxygen winter ascents; wH&H-noO2, high Himalayan 8K peaks non-oxygen winter ascents; wL&H-noO2, low Himalayan 8K peaks non-oxygen winter ascents; wL&K-noO2, low Karakoram 8K peaks non-oxygen winter ascents; w8000-yesO2, 8K peaks oxygen-supported winter ascents; wME-yesO2, Everest winter oxygen-supported ascents; wK2-yesO2, K2 winter oxygen-supported ascents.
BP, barometric pressure; Temp, temperature; Wind, wind speed; WCT, wind chill equivalent temperature; FFT, facial frostbite time.