Skyhunter said:
I see a lot of this kind of obfuscation. Not that there isn't still a lot we don't know or understand. I just feel that the GW deniers are grasping when they resort to cherry-picking and misrepresenting the conclusions of a study.
Skyhunter,
Maybe, maybe I am grasping. I admit that I am biased in my beliefs about the drivers of climate.
The Suns output is a direct driver; we can't obviously change that. The Earth's albedo is also a direct driver. Try as we might to change the Triple point of water, it is what it is, and we live in a buffered film of lots of water in all three phases. The % of the full Earth disk that is covered with clouds has been an incredibly stable and fixed %. That is because of a very stiff feedback mechanism. (If it were otherwise, then this % would vary widely. It does not, so it must be governed by a stiff feedback mechanism.) For as some have calculated, http://www.gi.alaska.edu/ScienceForum/ASF11/1191.html
If the Earth's temperature rises by 2 deg F, in our buffered skin of water in all three phases, will there be more, less or the same amount of water as vapor in our buffered atmosphere? And if there is more, will there be more, less or the same amount of net reflective clouds in our atmosphere? And if more, will the Earth's albedo decrease, increase, or stay the same?
All these years of satellite imagery, why has there never been an image of the Earth with cloud cover everywhere? What prevents that? With cloud cover nowhere? WHat prevents that? It's not a purely random event, because in any long string of random numbers, ".33" does not keep coming up day after day after day after day...
In fact, there has only ever been evidence of cloud cover covering only an extremely tiny narrow and stable range of the full Earth disk--because it must. Because sunlight is a direct driver, and so is Earth albedo. Land, ocean, ice albedo changes slowly, but since we have the happy fortune of living in a thin buffered atmosphere with lots of water in all three phases, we would have to evaporate our oceans (under cloud filled skies and without the Sun's help) to knock ourselves out of this buffer and its stiff feedback mechanism. Or, likewise, freeze all the water, without shade from the Sun; an equal impossibility for Man.
This could take a while. If all of mankinds energy consumption were devoted to heating up the ocean, it would take us about 10000 years just to raise the oceans 1 deg F. Cooling it, we'd do no better, even with the best minds and 100% of the world's resources put to the task.
In the meantime, the Sun would no longer be helping us, and Earth's radiative cooling would be cooling off the Earth faster than we could heat it up.
These are direct drivers. The atmosphere is about 20% O2, about 80% N2, and about 0% everything that the pinheads say is really driving climate, measured in ppm. O2 and N2 are greenhouse gasses; the 'greenhouse' effect would be called "Boyles Law"(+ Charles Law = Ideal Gas Law) anywhere else except in mystic boogeyman sceintific street theatre. The surface of the Earth is warmer than the planet radiative balance skin temperature because as pressure increases, so does temperature. Thank you gravity, that is 'the greenhouse effect.'
Can we substantially change the physics of that? Can we change the atmospheric gas constant significantly, or is our atmosphere still 'about 20% O2, and about 80% N2?'
And here is where the mystics live: can we substantially alter the albedo feedback mechanism, such that we alter the stiffness of the feedbaclk mechanism, or render it a positive feedback mechanism(such that the feedback amplifies perturbations, instead of damps them?
Because, when over 40 years of satellite imagery doesn't support our pet theories, and instead, we have to resort to 'more reliable' modeling of 'earth shine observations' made by folks staring at the moon centuries ago, or 'ice core gas analysis' of a handful of samples somewhere on Earth is divined to tell us 'the' temperature of the Earth 50000 yrs ago, something silly is going on.
Natural variations in solar output, volcanic emissions(not just step loading eruptions, emissions are almost constant) provide perturbations which far outweight anything man can do, and as is murkily shown by the INDOEX/Global coo...err, dimming/warming debates, not everything that man does uniformy contrinutes to either warming or cooling, but both!
So the real issue is, is the 'net' impact of mans activity(not his total greenhouse gasses/ppm emmissions contrinution to global warming, nor his total particulate contrinution to global coo--err dimming, but his net impact) significantly consequential, related to 'natural' variations which we ultimately know will end in a dim 3 deg K soup of nothing no matter what we do or don't do, so is clealry not in any long term mythical 'balance' that the mystics claim for it.
Of course, this would require that we actually knew or could measure man's net impact: we can't. It would also require that we 'knew' what the 'natural balance' was, and we don't. It would require that we 'knew' that Man was not part of the natural world, and that is another totally religious assertion.