Energy release by the bomb probably isn’t the right metric here. A multimegaton bomb spends a lot of that energy heating plasma into hotter plasma. This has minimal climate impact.
The scenario the nuclear winter researchers had in mind was that those 100 bombs each start catastrophic fires that burn down major cities. Those fires can produce lots of soot and ash that have climactic effects, and then lift the particulates into the stratosphere.
I don’t have enough of a background to comment on whether and why those fires would be worse than a large brushfire or forest fire, but I’m pretty sure it isn’t about megajoules of energy.
If it isn’t about MJ, then it is about the amount of dust and soot?
Pinatubo ejected about 10 cubic kilometers of dust into high altitudes. The potential energy of this dust was far greater than the energy of all atom bombs. Ignite them all and you will get just enough energy to get 1 cubic kilometer of rocks a few kilometers high.
The atomic bombs are merely the ignition devices—their energy does not go into projecting particles upwards (or very little). The burning cities are the sources of smoke, the close proximity prevents easy dilution of the smoke, and solar heating gets the particles up the last few kilometers before the clouds have time to disperse (incidentally, smoke from forest fires isn’t as black, thus the solar heating effect isn’t prominent for them).
A volcano ash is often black. The mass of already mentioned Pinatubo’s dust, exceeds the mass of all human artifacts on the planet. If everything we have, go in smoke, it has less mass than the said dust, airborne in 1991.
Now you’re just making stuff up. According to this http://www.thefreelibrary.com/Mt.+Pinatubo’s+cloud+shades+global+climate.-a012467057 , there were 20 million tons of SO2 ejected into the atmosphere. The number of cars in the world is about 800 million cars on the road http://en.wikipedia.org/wiki/Automobile, mass about 1.5 tons, so we’re ahead on those alone. Even if we’re generous, and include the “10 billion metric tonnes (10 cubic kilometres) of magma” in Pinatubo (most of which is not relevant for the current discussion), I haven’t started counting the trucks and trains and the 300 000 tons super tankers, all the smaller ships, the roads and the railways, etc… We’ll reach 10 billion tons long before we have to start counting the largest mass in human artifacts: the buildings.
1 tone of (combustible) artifacts per every person in on Earth—went up in smoke—would be the same mass. A very unrealistic assertion—but still nothing like “decade of nuclear winter”.
5 cubic kilometres of material is very vague measure. What matters is the mass of tiny particles that stay airborne for significant length of time and get significantly high in atmosphere, and those are small fraction of the total ejected material (almost all of which falls out nearby).
Also, even though you personally don’t own a lot of (combustible) asphalt, your city does. And even though you don’t keep tons of gasoline, coal, etc. your car does, over its lifetime. There is a lot of combustible stuff per person, it’s just that we delegate it’s storage to other people. You have electricity powering your pc, that means there is a big powerplant out there that you got to count, and rest of infrastructure.
Energy release by the bomb probably isn’t the right metric here. A multimegaton bomb spends a lot of that energy heating plasma into hotter plasma. This has minimal climate impact.
The scenario the nuclear winter researchers had in mind was that those 100 bombs each start catastrophic fires that burn down major cities. Those fires can produce lots of soot and ash that have climactic effects, and then lift the particulates into the stratosphere.
I don’t have enough of a background to comment on whether and why those fires would be worse than a large brushfire or forest fire, but I’m pretty sure it isn’t about megajoules of energy.
If it isn’t about MJ, then it is about the amount of dust and soot?
Pinatubo ejected about 10 cubic kilometers of dust into high altitudes. The potential energy of this dust was far greater than the energy of all atom bombs. Ignite them all and you will get just enough energy to get 1 cubic kilometer of rocks a few kilometers high.
It was no nuclear winter, again, from Pinatubo.
The atomic bombs are merely the ignition devices—their energy does not go into projecting particles upwards (or very little). The burning cities are the sources of smoke, the close proximity prevents easy dilution of the smoke, and solar heating gets the particles up the last few kilometers before the clouds have time to disperse (incidentally, smoke from forest fires isn’t as black, thus the solar heating effect isn’t prominent for them).
A volcano ash is often black. The mass of already mentioned Pinatubo’s dust, exceeds the mass of all human artifacts on the planet. If everything we have, go in smoke, it has less mass than the said dust, airborne in 1991.
Now you’re just making stuff up. According to this http://www.thefreelibrary.com/Mt.+Pinatubo’s+cloud+shades+global+climate.-a012467057 , there were 20 million tons of SO2 ejected into the atmosphere. The number of cars in the world is about 800 million cars on the road http://en.wikipedia.org/wiki/Automobile, mass about 1.5 tons, so we’re ahead on those alone. Even if we’re generous, and include the “10 billion metric tonnes (10 cubic kilometres) of magma” in Pinatubo (most of which is not relevant for the current discussion), I haven’t started counting the trucks and trains and the 300 000 tons super tankers, all the smaller ships, the roads and the railways, etc… We’ll reach 10 billion tons long before we have to start counting the largest mass in human artifacts: the buildings.
Here http://pubs.usgs.gov/fs/1997/fs113-97/ they say, the Pinatubo ejected 5 cubic kilometers of ash into the air.
1 tone of (combustible) artifacts per every person in on Earth—went up in smoke—would be the same mass. A very unrealistic assertion—but still nothing like “decade of nuclear winter”.
5 cubic kilometres of material is very vague measure. What matters is the mass of tiny particles that stay airborne for significant length of time and get significantly high in atmosphere, and those are small fraction of the total ejected material (almost all of which falls out nearby).
Also, even though you personally don’t own a lot of (combustible) asphalt, your city does. And even though you don’t keep tons of gasoline, coal, etc. your car does, over its lifetime. There is a lot of combustible stuff per person, it’s just that we delegate it’s storage to other people. You have electricity powering your pc, that means there is a big powerplant out there that you got to count, and rest of infrastructure.
What does the amount of truth have to do with it?
Edit: Oh, soot, nevermind.