Sentences with phrase «possible temperature reconstructions»

Not exact matches

For example, bristlecone pines are known to be CO2 fertilized, creating a possible confounding problem if they are used in temperature reconstructionA figure from Mann's own website suggested that the medieval warm period reappeared if bristlecone pines were excluded from the reconstruction.

Do you think that in the same way that the Solanki et al paper on solar sunspot reconstructions had a specific statement that their results did not contradict ideas of strong greenhouse warming in recent decades, this (the fact that climate sensitivity projections are not best estimates of possible future actual temperature increases) should be clearly noted in media releases put out by scientists when reporting climate sensitivity studies?

Comparing proxy temperature reconstructions to instrumental temperatures is a mistake and a possible source of major errors.

These comparisons show no evidence that the possible biases inherent to tree - ring (alone) based studies impair in any significant way the multiproxy - based temperature pattern reconstructions discussed here.

> As part of our network of collaborators, it is possible to have access to > tree - ring patterns and related temperature reconstructions from a wide grid > of chronologies outside Europe.

We have also verified that possible low - frequency bias due to non-climatic influences on dendroclimatic (tree - ring) indicators is not problematic in our temperature reconstructions... Whether we use all data, exclude tree rings, or base a reconstruction only on tree rings, has no significant effect on the form of the reconstruction for the period in question... These comparisons show no evidence that the possible biases inherent to tree - ring (alone) based studies impair in any significant way the multiproxy - based temperature pattern reconstructions discussed here.

Further, our temperature reconstructions, within age uncertainty, can be well correlated with solar irradiance changes, suggesting a possible link between solar forcing and natural climate variability, at least on the northern Tibetan Plateau.»

For example, bristlecone pines are known to be CO2 fertilized, creating a possible confounding problem if they are used in temperature reconstruction

These comparisons show no evidence that the possible biases inherent to tree - ring (alone) based studies impair in any significant way the multiproxy - based temperature pattern reconstructions discussed here -LCB- my bold -RCB-.

Given the issues with the fit prior to that revelation and possible issues with Veizer's temperature reconstruction (see Royer 2004, 2006), I stand by my earlier characterization.

He has examined the question of whether it is possible for a 200 year temperature excursion of 0.9 degC, a century to rise and a century to fall, would show up in the Marcott et al reconstruction.

It is possible than a century long blip in temperature might not show up in this reconstruction so in some way we are limited in how we compare this reconstruction to the past 100 years of warming.

We have also verified that possible low - frequency bias due to non-climatic influences on dendroclimatic (tree - ring) indicators is not problematic in our temperature reconstructions...

Also of possible interest: the three reconstructions calibrating 5, 10, and 20 proxy PCs on the NH mean temperature (as opposed to PCs of the instrumental record in the other 12) are all at the warmer end (i.e. they all look like the green curve).

... My question is Do the error / uncertainty bars within a proxy reconstruction permit a viewer to infer any sort of temperature line through it as at least possible, or does one still have to hold fast to the mean?

His reconstruction does not prove a different past temperature, only the different results possible if you ignore calibration of the individual proxies.

One approach to depicting the uncertainty in the reconstructed temperature series is already done informally by considering a sample, or ensemble, of possible reconstructions.

In any case, this bias would act to damp the amplitude of reconstructed departures that are further from the calibration period mean, so that temperatures during cooler periods may have been colder than estimated by some reconstructions, while periods with comparable temperatures (e.g., possible portions of the period between AD 950 and 1150, Figure 6.10) would be largely unbiased.

If tree rings do not consistently follow temperature what possible use is there to a «temperature reconstruction» based on the rings?

Recent work in modelling the warm climates of the Early Eocene shows that it is possible to obtain a reasonable global match between model surface temperature and proxy reconstructions, but only by using extremely high atmospheric CO2 concentrations or more modest CO2 levels complemented by a reduction in global cloud albedo.

As opposed to the other possible conclusion: the «problems associated with interpreting many of them as unambiguous measures of hemispheric temperature change» remain an unsurmounted obstacle and the reason why the Mann reconstruction goes up so sharply when the Briffa reconstruction based on a very large population of temperature sensitive sites goes down remains unexplained and a critical problem within the field.