Sentences with phrase «irradiance changes only»

We also use five - member ensembles of simulations with greenhouse gas changes only (GHG), volcanic and solar irradiance changes only (NAT), and aerosol changes only (AER) over the period 1850 — 2010.»

Not exact matches

Critics of this result might argue that the solar forcing in these experiments is only based on the estimated change in total irradiance, which might be an underestimate, or that does not include potential indirect amplifying effects (via an ozone response to UV changes, or galactic cosmic rays affecting clouds).

Now, as far as solar forcing is concerned, we only know for sure about changes in direct measurable solar irradiance, but not about other forcing mechanisms.

Forced changes in irradiance are not only affected by changing concentrations of constituents or other external sources, but also by changes in water vapor and clouds.

Of course, the same could be said for global temperature, where a half degree C temperature increase on an absolute Kelvin scale would only be about 0.17 %, so an argument can be made that on a percentage basis, this change in irradiance is about the same order of magnitude as our change in temperature.

Direct solar irradiance is very likely not the only mechanism by which the changes in solar activity influence our climate.

So, to my previous post, it looks like AR5 will give a bit more coverage to other sources of solar forcing beside only direct solar irradiance — it least in its chapter covering «radiative forcing» if not in the chapter on «understanding and attributing climate change» (which is being written by a different group).

I came to think of solar radiation as being the ultimate (and only) external forcing of the climate system, which, except for the orbital seasonal changes and the 11 - year sunspot cycle, has been essentially constant over the past several decades of precision solar irradiance monitoring.

With regard to proxy studies, same basic questions, are these direct or passive correlations, what evidence that tree ring core thickness depends only on temperature (what about precipitation, cloud cover, volcanic activity, sea surface temperatue changes, sea current changes, solar irradiance changes, cloud cover, etc.) How are these variables accounted for when analysis of ice cores is completed, or for that matter when computer models, and / or proxy studies are completed.

Solar irradiance measurements from 1978 to 2013 will have sampled only three 11 - year irradiance cycles, which alone is insufficient time to determine whether long - term irradiance trends occur or to quantify the broad range of irradiance changes possible in activity cycles of varying strength.