Jovial Monk wrote on Apr 7
th, 2017 at 7:30am:
Quote:
The primary source of energy in the Earth’s climate system is incoming solar radiation, termed total solar irradiance, or TSI. At equilibrium, because of the requirement of energy conservation, the Earth’s radiative budget must balance such that TSI is equal to outgoing longwave radiation at the top of the atmosphere (a state known as radiative equilibrium). Since the radiation emitted by a body is a function of surface temperature, the Earth’s ‘effective temperature’ (TE) is the temperature at which radiative equilibrium is achieved assuming the Earth acts like a blackbody, and can be calculated (in K)
Yes. And the energy imbalance is 0.6W +/*17w / m
2. So realistically you have no idea of energy imbalance.
Jovial Monk wrote on Apr 7
th, 2017 at 7:30am:
where Fs is the TSI (currently ∼1,368 Wm−2), σ is the Stefan–Boltzmann constant (5.67 × 10−8 W m−2 K−4), A=0.29 (ref. 1) is the Earth’s average planetary albedo (the fraction of incoming radiation scattered or reflected back out of the atmosphere by clouds, particulates in the atmosphere and the Earth’s surface),
When is the earth at average planetary albedo? Is it now? If not, that is a spurious argument.
Jovial Monk wrote on Apr 7
th, 2017 at 7:30am:
However, at the temperatures and pressures typical of the Earth’s surface, water vapour and clouds act as feedbacks rather than drivers of the greenhouse effect,
Why don't they use actual figures for these feedbacks? They can't even decide if clouds are a positive or negative feedback.
Jovial Monk wrote on Apr 7
th, 2017 at 7:30am:
Quote:
As a result, there has been an increase in TSI of ∼400 Wm−2 since the formation of the Earth.
I'd like to see the proof of that. Such exactititude. no error bars.
Jovial Monk wrote on Apr 7
th, 2017 at 7:30am:
in early Cambrian/Ordovician time the sun was much weaker than now.
How was this calculated?
Jovial Monk wrote on Apr 7
th, 2017 at 7:30am:
Quote:
Following ref. 4, and assuming an effective emissivity, ɛ, of the Earth of 0.6 (that is, 40% of longwave radiation is absorbed by greenhouse gases in the atmosphere), equation (1) can be used to define the following equation that describes S for today’s climate (where the surface temperature=287.1 K) in the absence of any climate feedbacks (for example, water vapour, sea-ice etc.), also known as the Planck response (hence the subscript ‘P’)
Oh, we are making assumptions.
Jovial Monk wrote on Apr 7
th, 2017 at 7:30am:
. Since the combined effect of the greenhouse gas and other climate feedbacks (for example, water vapour, lapse rate, sea-ice etc.) is positive
Like clouds?
Jovial Monk wrote on Apr 7
th, 2017 at 7:30am:
yet there is a longstanding view that, despite the increase in solar output, Earth’s surface temperature was, for much of geological time, warmer, not colder, than today
And no runaway global warming.
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