Sentences with phrase «volcanic cooling»

This cooling was from the same root cause as volcanic cooling, namely aerosols (mostly sulfate aerosols) in the atmosphere.

Hence, high latitude trees may in fact over estimate volcanic cooling.

As we emphasized in the first paragraph of our original paper (and again in the comment), we find that the only place where there is in fact an obvious mismatch is w.r.t the large volcanic cooling episodes.

Since GISS have made several retrospective adjustments to their data and Hansen also exaggerates volcanic cooling estimations it may well be interesting to look into why.

Volcanic Cooling March 05, 2014 Despite their fiery nature, volcanic eruptions actually cool the Earth over time and may explain a recent deceleration in global warming trends.

Though the evidence seems firmly against the idea of stand - wide missing rings as the explanation, the potential model - data discrepancy during volcanic cooling episodes is certainly an issue worth airing.

In fact, just a few months ago I published a paper in the journal Nature Geoscience that demonstrated one potential flaw in using tree rings to estimate past volcanic cooling events.

the 1920s trend was measured from the depth of an (unexplained) decadal cool period while the recent trend, i.e., measured beginning in 1994, after the 1991 - 1993 Mt. Pinatubo volcanic cooling and especially because 2.)

But El Chichon erupted when an El Nino warming was about to start and he could not find any convenient La Nina that could simulate volcanic cooling.

Not to mention imaginary volcanic coolings.

Knowing now that there is no contamination from volcanic cooling mixed in with ENSO oscillations we can go ahead and place colored dots in the middle of each line connecting an El Nino peak and its adjacent La Nina valley.

Reduced forcing will lead to exaggerated CS for volcanic cooling effects, which in turn will likely lead to some other warming forcing also being over-estimated.

The explanation is actually simple: there is no such thing as volcanic cooling of the troposphere.

«While the precise implications of the CI eruption for cultures and livelihoods are best understood in the context of archaeological data sets,» write Black and colleagues, the results of their study quantitatively describe the magnitude and distribution of the volcanic cooling and acid deposition that ancient hominin communities experienced coincident with the final decline of the Neanderthals.

We argue that this — and other missing episodes of volcanic cooling, are likely an artifact of biological growth effects, which lead to a substantial underestimation of the largest volcanic cooling events in trees growing near treeline.

However, are pseudoproxy analysis suggests that the volcanic cooling signals of interest will only emerge in coarse - scale averaging over multiple records in multiple regions, because of the obscuring impact of proxy noise and regional climate noise.

It turns out that for the signal - to - noise ratios estimated for the individual tree - ring records, one would be hard pressed to cleanly isolate the volcanic cooling signal in individual records or even regional composites.

My impression is that the volcanic coolings — even after major erruptions — are not only underestimated by tree rings but also by ice cores (d18o or melt layers) where the actual volcanic signals (sulfates, ashes etc) were recorded at the beginning.

The forecast takes into account known contributing factors, such as El Niño and La Niña, increasing greenhouse gas concentrations, the cooling influences of industrial aerosol particles, solar effects, volcanic cooling effects if known, and natural variations of the oceans.