3 ms·

Bomber contrails affected climate by up to 1.4 °F during WW2

pyinstallwoes 4y ago
> Contrails, by affecting the Earth's radiation balance, act as a radiative forcing: they trap outgoing longwave radiation emitted by the Earth and atmosphere more than they reflect incoming solar radiation. In 1992, the warming effect was estimated between 3.5 mW/m2 and 17 mW/m2.[15] Global radiative forcing has been calculated from the reanalysis data, climate models, and radiative transfer codes; estimated at 12 mW/m2 for 2005, with an uncertainty range of 5 to 26 mW/m2, and with a low level of scientific understanding.[16] > The effect varies daily and annually: night flights contribute 60 to 80% of contrail radiative forcing while accounting for 25% of daily air traffic, while winter flights contribute half of the annual mean radiative forcing while accounting for 22% of annual air traffic.[17] Contrail cirrus may be air traffic's largest radiative forcing component, larger than all CO2 accumulated from aviation, and could triple from a 2006 baseline to 160-180 mW/m2 by 2050 Without interventions.[18][19] > Condensation trails may cause regional-scale surface temperature changes for some time.[20][verification needed] NASA researched atmospheric and climatological effects of contrails, including effects on ozone, ice crystal formation, and particle composition, during the Atmospheric Effects of Aviation Project (AEAP).[21] > Bomber contrails affected climate during World War II.[22][23] A 0.8 °C (1.4 °F) hotter temperature was recorded near airbases.[24] https://wikiless.org/wiki/Contrail?lang=en#Radiative_forcing https://wikiless.org/wiki/Contrail?lang=en#Radiative_forcing Thought that was quite intriguing.
- LargoLasskhyfv 4y ago
  https://globalnews.ca/news/2934513/empty-skies-after-911-set-the-stage-for-an-unlikely-climate-change-experiment/ https://globalnews.ca/news/2934513/empty-skies-after-911-set...
  - pyinstallwoes 4y ago
    Wild, I've never heard this suggested in relation to the "climate debate." Wouldn't this explain a large percentage of the variance in weather? It also aligns with flight as an industry growing, and it's demonstrably shown to be caused not just correlation. Hmm.
    - LargoLasskhyfv 4y ago
      That was just the first hit I got, after remembering, and searching for it. I also remember naysayers, when this came up years ago, also here on HN, much later. Just thought it to be related, so posted it again :-)

> Contrails, by affecting the Earth's radiation balance, act as a radiative forcing: they trap outgoing longwave radiation emitted by the Earth and atmosphere more than they reflect incoming solar radiation. In 1992, the warming effect was estimated between 3.5 mW/m2 and 17 mW/m2.[15] Global radiative forcing has been calculated from the reanalysis data, climate models, and radiative transfer codes; estimated at 12 mW/m2 for 2005, with an uncertainty range of 5 to 26 mW/m2, and with a low level of scientific understanding.[16] > The effect varies daily and annually: night flights contribute 60 to 80% of contrail radiative forcing while accounting for 25% of daily air traffic, while winter flights contribute half of the annual mean radiative forcing while accounting for 22% of annual air traffic.[17] Contrail cirrus may be air traffic's largest radiative forcing component, larger than all CO2 accumulated from aviation, and could triple from a 2006 baseline to 160-180 mW/m2 by 2050 Without interventions.[18][19] > Condensation trails may cause regional-scale surface temperature changes for some time.[20][verification needed] NASA researched atmospheric and climatological effects of contrails, including effects on ozone, ice crystal formation, and particle composition, during the Atmospheric Effects of Aviation Project (AEAP).[21] > Bomber contrails affected climate during World War II.[22][23] A 0.8 °C (1.4 °F) hotter temperature was recorded near airbases.[24] https://wikiless.org/wiki/Contrail?lang=en#Radiative_forcing https://wikiless.org/wiki/Contrail?lang=en#Radiative_forcing Thought that was quite intriguing.

LargoLasskhyfv 4y ago
https://globalnews.ca/news/2934513/empty-skies-after-911-set-the-stage-for-an-unlikely-climate-change-experiment/ https://globalnews.ca/news/2934513/empty-skies-after-911-set...
- pyinstallwoes 4y ago
  Wild, I've never heard this suggested in relation to the "climate debate." Wouldn't this explain a large percentage of the variance in weather? It also aligns with flight as an industry growing, and it's demonstrably shown to be caused not just correlation. Hmm.
  - LargoLasskhyfv 4y ago
    That was just the first hit I got, after remembering, and searching for it. I also remember naysayers, when this came up years ago, also here on HN, much later. Just thought it to be related, so posted it again :-)