Not exact matches
«We know that
volcanic activity can have a major
effect on the environment, so the big question was, how are these two events related,» Macdonald
said in a statement Monday.
What I am
saying is that it makes no sense at all to hand - wave at the
effects of uncontrolled
volcanic eruptions as «absolute proof» that geoengineering schemes «can work», while promoting a gradual 50 - year phaseout of GHG emissions (which is too slow to have any hope of preventing catastrophic outcomes) as «logical» (whatever that means) and ignoring the multiple studies that show we can easily phase out emissions in a fraction of that time with the proven technologies that are already at hand.
What he really means, of course, is that additional
volcanic activity, had it taken place, would have added more aerosols, thus slowing the overall dissipation, which would in turn have enhanced the cooling
effect of
said aerosols.
I
say usually, since there are cases such as the trees flattened by the Tunguska impact, or buried by
volcanic ash, that quite obviously recorded direct
effects these event.
Victor, if an absence of
volcanic aerosols results from their «dissipation» and this in turn results in a «rebound» as you
say it does, is not such a «rebound» a «real
effect» resulting from an «absence» (or more usually a partial absence) of
volcanic aerosols?
Having
said that, 1258 itself was a horrendous year but the
volcanic effects were very short lived.
In the abstract you
say that you can easily define certain
effects (in the MWP period) such as GHG influence, «the reconstructions of solar,
volcanic and land use - related forcing are more uncertain».
«This is a consequence of variations in heat exchange between the atmosphere and the oceans, and other decade - to - decade changes like variations in solar forcing and the solar dimming
effects of pollution and
volcanic eruptions,» BoM
says.
The
effects on health statistics, can also be from other mechanisms
say from
volcanics where both extremal temps can prevail ie hot summers and cold winters such as laki where the airborne pollution was also a significant factor in both decreasing the availability of food (PAR) and respiratory ailments.
Backing that up, NASA
says that 1) sea surface temperature fluctuations (El Niño - La Niña) can cause global temperature deviation of about 0.2 °C; 2) solar maximums and minimums produce variations of only 0.1 °C, warmer or cooler; 3) aerosols from natural sources such as
volcanic eruptions (Mount Pinatubo for example) have caused average cooling of 0.3 °C, but recent eruptions have had not had significant
effect.
I'm not interested in where you ski, but that it seems you're
saying volcanic activity and hot material reaching the earth's crust have no
effect on temperature or climate.
Volcanic effects have been exaggerated, as I've discussed above and you have said many times there is little evidence that volcanic effect is anything near what the models
Volcanic effects have been exaggerated, as I've discussed above and you have
said many times there is little evidence that
volcanic effect is anything near what the models
volcanic effect is anything near what the models produce.