It takes millions of years to compensate, enough for
slow changes in the Sun, but not enough to immediately correct for humans dumping tons of extra CO2 every year.
In a recent interchange over at Joanne Nova's always interesting blog, I'd said that
the slow changes in the sun have little effect on temperature.
Not exact matches
Dr. Benestad states: «
In their formula for the calculation of the
sun - related temperature
change, the long - term
changes are determined by Zeq, while their «climate transfer sensitivity to
slow secular solar variations» (ZS4) is only used to correct for a time - lag.
In their formula for the calculation of the
sun - related temperature
change, the long - term
changes are determined by Zeq, while their «climate transfer sensitivity to
slow secular solar variations» (ZS4) is only used to correct for a time - lag.
There was a really interesting article
in Physics Today this past October on the parallels between the
slow acceptance of the idea of anthropogenic climate
change and of the idea that the earth circles the
sun.
The data show that the
sun's variations have been small over the times we care about, the climate responds to variations
in sunshine caused by orbital
changes, but these are
slow.
Ideas that commonly surface include perturbations to the earth's orbit by other planets, disruptions of ocean currents, the rise and fall of greenhouse gases, heat reflection by snow, continental drift, comet impacts, Genesis floods, volcanoes, and
slow changes in the irradiance of the
sun.
It seems to me,
in spite of the noise from the climate
change skeptics, pretty simple: nature sequestered carbon over hundreds of millions of years, keeping the earth comfortable
in spite of the very
slow increase
in the
suns flux over those millennia, and now we are undoing all of nature's work
in order to drive our economy.
There is also the coincidence problem that since the rotation of the Earth
changes over time [it
slows down] we live
in the special period where the natural cycles just happen to match that of the
Sun.
Most people thought, back then, that the ice buildup and the ice melting were largely due to those
slow changes in various aspects of the earth's orbit around the
sun.
Yet the pot is very very large and can take decades to finish moving... So we end up with rapid
changes of air temperature sometimes
in response to
sun modulation; but longer term
changes in sea temperature and a «lag time» from that showing up
in longer
slower air temperature
change.
For example, a recent
slowing in the rate of surface air temperature rise appears to be related to cyclic
changes in the oceans and
in the
sun's energy output, as well as a series of small volcanic eruptions and other factors.
The short answer is that the Earth's orbital
changes (Milankovich cycles) cause really, really
slow variations
in the amount of the
Sun's radiation that hits the northern hemisphere.