Not exact matches
In addition, since the global surface temperature records are a measure that responds to albedo changes (volcanic aerosols, cloud cover, land use, snow and ice cover) solar output, and differences in partition of various forcings into the oceans / atmosphere / land / cryosphere, teasing out just the effect of CO2 + water vapor over the short term is difficult to impossibl
In addition,
since the global surface temperature records are a measure that responds to albedo
changes (volcanic aerosols, cloud cover, land use, snow and ice cover)
solar output, and differences
in partition of various forcings into the oceans / atmosphere / land / cryosphere, teasing out just the effect of CO2 + water vapor over the short term is difficult to impossibl
in partition of various forcings into the oceans / atmosphere / land / cryosphere, teasing out just the effect of CO2 + water vapor over the short term is difficult to impossible.
While
changes in solar output have slightly increased global average temperature
since the beginning of the Industrial Revolution, the planet - warming effect of man - made greenhouse gases is about 20 times larger -LRB-
The Little Ice Age following the Medieval Warm Period ended due to a slight increase
in solar output (
changes in both thermohaline circulation and volcanic activity also contributed), but that increase has
since reversed, and global temperature and
solar activity are now going
in opposite directions.
«
Since irradiance variations are apparently minimal,
changes in the Earth's climate that seem to be associated with
changes in the level of
solar activity — the Maunder Minimum and the Little Ice age for example — would then seem to be due to terrestrial responses to more subtle
changes in the Sun's spectrum of radiative
output.
The IPCC reports document the plausible intrinsic
solar output increase of perhaps 0.12 W / m2
since 1750 as being the only significant natural agency
in terms of climate
change: if my calculations of the natural
changing insolation values are correct, then the IPCC is demonstrated to have erred
in that respect.
Since such models can not account for the climate system's apparent sensitivity to small perturbations
in solar energy apparently brought about by the very long term
changes in the Earth's orbit about the Sun, they may also underestimate climate sensitivity to energy
output fluctuations caused by
solar activity, even during the eleven - year Schwabe cycle.
There's been a 60 % reduction
in aerosol optical depth across Europe
since 1986, and that appears to have lead to an increase
in surface short - wave
solar radiation (not due to
changes in solar output!).