Environment & Energy
Related: About this forumCost of cloud brightening for cooler planet revealed
http://www.manchester.ac.uk/discover/news/article/?id=1353416 Dec 2014
[font size=4]University of Manchester scientists have identified the most energy-efficient way to make clouds more reflective to the sun in a bid to combat climate change.[/font]
[font size=3]Marine Cloud Brightening is a reversible geoengineering method proposed to mitigate rising global temperatures. It relies on propelling a fine mist of salt particles high into the atmosphere to increase the albedo of clouds the amount of sunlight they reflect back into space. This would then reduce temperatures on the surface, as less sunlight reaches the Earth.
Clouds form when water droplets gather on dust or other particles in the air. Increasing the amount of salt particles in the atmosphere allows more of these water droplets to form, making the clouds denser and therefore more reflective.
A new paper, published in the journal Philosophical Transactions of the Royal Society A, has looked at four different ways of getting the particles into the sky, to compare how effective they may be. The researchers found that a technique called the Rayleigh Jet proved to be best.
Named after Lord Rayleigh, who provided the theory, the technique relies on spraying a fine jet of water that breaks down into small droplets into the sky. The liquid droplets evaporate quickly, leaving behind just the salt particles.
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d_r
(6,907 posts)immoderate
(20,885 posts)Peter Piper will be able to actually pick a peck of pickled peppers!
--imm
OKIsItJustMe
(19,938 posts)I am not recommending that we use any of these techniques now, but it is important to know how best to use them should they become necessary. Should no progress be made to reduce CO2 levels, then geoengineering techniques, similar to this, might become necessary to avoid dangerous rises in global temperatures.
Youre better off planning ahead how to get out of a burning buildingeven though you dont plan on having a firerather than waiting for a fire to figure things out on the fly.
This method does not appear to be irreversible.
These particles, say the papers authors, could be generated from specially built ships that could travel the worlds oceans spraying salt particles into the air where they then hang in the atmosphere for several days until they return to Earth as rain.
d_r
(6,907 posts)Don't take me serious
GliderGuider
(21,088 posts)~Eric Sevareid
Agnosticsherbet
(11,619 posts)The human race is already experimenting with geo engineering in epic ways. And most of those methods have a negative outcome.
GliderGuider
(21,088 posts)The first rule of holes: "When you realize you're in one, stop digging."
That seems like a good beginning to me.
Agnosticsherbet
(11,619 posts)Not doing anything means we are going to hell in a hand basket at an epic pace.
GliderGuider
(21,088 posts)I'm in favour of not speeding things up any more than we have to.
Agnosticsherbet
(11,619 posts)White clouds do reflect light and heat.
The idea is to use a natural feature of clouds as a brake on an accelerating greenhouse affect.
They are not proposing we throw dog biscuits in the air, and perform an Indian Rain Dance, or sacrifice a million goats to George Bush.
From everything I've read, they have not suggest we go balls to the walls and seed the entire planet.
Experimentation could be used to test the theory.
Doing nothing is not working. Changing to greener forms of energy will not be sufficient to stop the warming.
Humanity is already doing random things with carbon and other greenhouse gasses. Creating clouds and using a fundamental feature of clouds to reflect heat and light away is not random.
GliderGuider
(21,088 posts)As in, shut down the global economy and let Mother Nature sort it out - she does such things best.
OTOH, we will not succeed in doing anything to ameliorate the situation in the time we have left, so we might as well just keep on doing what we're doing.
Agnosticsherbet
(11,619 posts)of the human race that must drink that last glass of Kool-Aid to save the planet? That's noble.
I think that even if we can not succeed, the only humane thing to do is to try to do something to fix the problem. Better to rage against the dying of the light than to go willingly into the dark.
GliderGuider
(21,088 posts)Rage all you want! I don't like the feeling of rage, so I try not to. I do enjoy mentioning from time to time that there are other options besides rage and screwing with Mother Nature more and more.
OKIsItJustMe
(19,938 posts)Mother Nature will have things sorted out by herself in 500,000 years or so.
GliderGuider
(21,088 posts)OKIsItJustMe
(19,938 posts)(Assuming theres a correct response. Doing random stuff, might produce the correct response by pure chance.)
In any case, thats the whole point of this exercise: i.e. to not do random stuff, but well thought out stuff.
GliderGuider
(21,088 posts)At this point there is nothing we can do to fix it, so by doing things - planned or random - we're just amusing ourselves to death.
OKIsItJustMe
(19,938 posts)Why not try to do something positive. Even if it is just to amuse ourselves?
GliderGuider
(21,088 posts)I'll do whatever I think is right for my own amusement, thanks.
I think it's OK for people just to do whatever they think/feel is right.
OKIsItJustMe
(19,938 posts)Doing nothing is not doing something positive.
It is doing nothing.
GliderGuider
(21,088 posts)As you say, doing "nothing" isn't positive, it's doing nothing. That's what I would prefer, but we won't do nothing, will we? We can't stop doing things. So act away, don't pay any attention to me.
hatrack
(59,585 posts)However, it appears that any such similar inaction, such as failure to mine, refine and ship tar sands crude, failure to frack, failure to capture CO2 and use it to reinvigorate old oil wells - all are inactions we're not capable of doing (or not doing, if you prefer).
Inactions like these are very possibly the only chance we've got at preserving even a pale shadow of the biosphere as we have known it.
See anybody - corporate, governmental, scientific, technological sectors - boldy taking inaction these days? Yeah, me neither.
The2ndWheel
(7,947 posts)We do whatever we do, and have to deal with the consequences. That's it. It just goes on and on like that. Some of those consequences are positive, and some are negative. Of course anyone's particular definition of positive and negative can be different than that of someone else.
That's what makes it all so...I don't know the right word for it. We can't do nothing, as existing requires doing something. We can't escape that. Whatever we do though, doesn't fix anything. It just changes it. There's an upside to the change, whatever it may be, but always a downside as well. Again, upside/downside, subject to personal perspective.
There is no perfect state of existence that we can get to where everything will be fine, because we can't take every variable into account. Nature, or whatever someone wants to call it, can't even do it. The balance is always changing. Life also requires death. We don't like death, and actively try to prevent it, everywhere, all the time. No form of life likes death, which is why every form of life will struggle for its life if need be. However, no other species fights the reality of existence the way we do, because they can't. We can't either, but we think we can, which is how we've found ourselves in this predicament.
OKIsItJustMe
(19,938 posts)I trust you will agree that there are things which can be done which produce little if any effect, that anyone would consider to be positive.
For example: Lets solve the problem of climate change by sanitizing the planet with high-yield thermonuclear weapons (say wide use of the Tsar Bomba.)
I just dont see where there is much of an upside to that.
So, in my view, it does matter what we do.
The2ndWheel
(7,947 posts)Why would they be done? Who would do something, get X as a result, then change what they're doing, get the same X as a result, and consider that a positive?
Write something on a piece of paper with a blue pen, then write something on a piece of paper with a red pen. Is that a positive step?
I agree with you that what we choose to do can and does matter, all I'm saying is that what we choose to do won't fix anything. It just changes the equation. Domestication of animals, a positive for human beings over time, but now we have a hell of a lot of people that need to be fed and need jobs. Plus we have to maintain the animals and all the infrastructure required to maintain them.
OKIsItJustMe
(19,938 posts)Or
If you push something hard enough, it will fall over. Sir Sidney Fudd
The thing is, we have already interfered with the natural functioning of the system. So, before we jump into a solution, we need to think really hard about it first. Thats what these guys are doing.
Demeter
(85,373 posts)The complexity of the global weather system hasn't been modeled to any degree of accuracy. Putting more random variables into the mix to "experiment" is not science, it's gambling with all life on earth.
hatrack
(59,585 posts).
OKIsItJustMe
(19,938 posts)Your point is that this measure would do nothing to address the problem of ocean acidification. (Correct?)
Agnosticsherbet
(11,619 posts)That is a horse of a different color.
OKIsItJustMe
(19,938 posts)And it's Ocean Acidification FTW!
This tactic would not address the problem of ocean acidification, and, so, is, at best, a partial solution.
hatrack
(59,585 posts).