Second, you can not directly compare the IPCC estimates of Charney sensitivity (which excludes
slow feedbacks like ice sheets and vegetation) and earth system sensitivity (which includes slow feedbacks).
There are, however, also
slow feedbacks like the change in surface albedo from the reduction of snow cover that contribute to TCS / ECS.
Not exact matches
Feedback is at a race - car level and so immediate you find yourself with what feels
like extra time to react, which in turn allows you to lean on the car hard using throttle and steering adjustments that are
slower than you'd expect.
Regardless, my kinesthetic
feedback loop corroborates the Aston's measured 50/50 weight distribution; barring dumb moves
like excessive turn - in during relatively
slow corners (been there, plowed that), the Vantage turns in easily and tracks responsively mid-corner, conveying a sense of willingness to rotate when provided appropriately thoughtful inputs.
Symptoms: shocking brakes, harder when going faster (higher frequency), both felt on the steering wheel as the brake peddle... when really
slow, it feels
like the
feedback on the brake peddle corresponds to the frequency of turning tires.
Weight transfer that leads to understeer or oversteer is remarkably palpable in
slow corners, thanks in part to the chassis stiffness and lack of
feedback - muddying deadweight
like nav systems, airbags, and stereo.
Brakes are great and work really well on both
slow conditions and much faster highway conditions but do lack the sense of
feedback that you get in the
likes of the C - Class.
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I would
like to see a discussion of the likelihood that factors traditionally viewed as
slow response
feedback factors (such as Arctic albedo, or high methane emissions permafrost degradation) may actually become faster response
feedback factors.
[1] CO2 absorbs IR, is the main GHG, human emissions are increasing its concentration in the atmosphere, raising temperatures globally; the second GHG, water vapor, exists in equilibrium with water / ice, would precipitate out if not for the CO2, so acts as a
feedback; since the oceans cover so much of the planet, water is a large positive
feedback; melting snow and ice as the atmosphere warms decreases albedo, another positive
feedback, biased toward the poles, which gives larger polar warming than the global average; decreasing the temperature gradient from the equator to the poles is reducing the driving forces for the jetstream; the jetstream's meanders are increasing in amplitude and
slowing, just
like the lower Missippi River where its driving gradient decreases; the larger
slower meanders increase the amplitude and duration of blocking highs, increasing drought and extreme temperatures — and 30,000 + Europeans and 5,000 plus Russians die, and the US corn crop, Russian wheat crop, and Aussie wildland fire protection fails — or extreme rainfall floods the US, France, Pakistan, Thailand (driving up prices for disk drives — hows that for unexpected adverse impacts from AGW?)
With even further warming more hydrates are released, additional global soil
feedback (extreme soil respiration rates, compost bomb instability) and weathering becomes a driver, now Ocean very stratified, maybe things
like permanent El Nino, weather systems probably move very
slow — everything gets stuck due to lack of perturbed ocean, no or very little frozen water at the poles.
I am thinking that the permafrost
feedback article we were discussing was refering to a non-runaway
feedback, but rather a delayed
feedback, which is otherwise just
like the fast
feedbacks except that it's
slow response would make clear that it does
feedback on itself according to the climate sensitivity from all other
feedbacks (it drives itself, via climate change, to go farther, but it approaches a limit asymptotically).
I'm not saying this is
like arranging deck chairs on the Titanic as it either A) more quickly or B) more slowly heads toward the ice berg, but I think we (as people, if not as scientists) should now start being concerned about reaching milestones in the warming (whether we reach them faster or
slower) at which positive
feedback loops kick in — even if this is difficult scientifically to quantify or prove.
Reducing global warming by 0.5 °C may not sound
like much, but when it comes to climate change, every tenth of a degree matters, and
slowing near - term warming is particularly important to avoid triggering
feedback loops that could accelerate further warming.
During a period
like the Holocene while warming to a Pliocene -
like climate,
slow feedbacks (such as reduced ice and increased vegetation cover) increase the sensitivity to around 4.5 °C for doubled CO2.