Sentences with phrase «individual temperature proxies»

This lack of consistency between individual temperature proxies, even in the same area, raises serious questions about the reliability of the global estimates.

Not exact matches

The NRC noted that «presently available proxy evidence indicates that temperatures at many, but not all, individual locations were higher during the past 25 years than during any period of comparable length since A.D. 900.»

Amplitude and Duration: Davis identified 650 individual cycles of Temperature - proxy Oscillation (TO - c350) cycles in the Vostok data over the past 220,000 years.

Here I've done the calculations so that I obtain the MBH98 temperature reconstruction (working here only with the 15th century proxies) as a linear combination of the 95 individual proxies in the 15th century network.

Here, we test a new proxy — the oxygen isotopic signature of individual benthic foraminifera — to detect rapid (i.e. monthly to decadal) variations in deep ocean temperature and salinity in the sedimentary record.

Temperature reconstructions for periods before about A.D. 1600 are based on proxies from a limited number of geographic regions, and some reconstructions are not robust with respect to the removal of proxy records from individual regions (see, e.g., Wahl and Ammann in press).

Three of these (Coppermine, Hornby Cabin and Mackenzie Mountains) were subsequently used in the Jacoby and D'Arrigo 1989 temperature reconstruction that was prominent in early NH reconstructions and as individual proxies in Mann et al 1998.

I would think in a more rational world we might be celebrating the recent Marcott paper, with its statements of uncertainties, its arbitrary re-dating of cores and its presentations of easily viewable individual proxy series, as a major revelation of the limitations on the use of available proxies in making long term temperature reconstructions.

As Hank implies, no paleoclimatologist says that individual proxies response to «global temperatures».

Just wanted a clarification that he EIV method uses * global * temperatures to perform the screening / calibration of the individual ** local ** proxies — is that correct?

Presently available proxy evidence indicates that temperatures at many, but not all, individual locations were higher during the past 25 years than during any period of comparable length since A.D. 900.

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

To tease any reliable information, the individual proxies have to be calibrated to temperature, with confidence intervals applied and the combination of the proxies have to consider the confidence intervals of each proxy.

If one is willing to wade through the individual proxy series divergence can be seen in many proxy responses to temperature.

What they've done is pick the highest temperature in any individual record from the entire 800-1200 period (and sometimes they extend it all the way to 600 AD or 1400 on the other end), and compare it to the most recent record of whatever proxy is involved.

A number of spurious criticisms regarding the Mann et al (1998) proxy - based temperature reconstruction have been made by two individuals McIntyre and McKitrick (McIntyre works in the mining industry, while McKitrick is an economist).

These consist of individual, or small regional averages of, proxy records collated from those used by Mann and Jones (2003), Esper et al. (2002) and Luckman and Wilson (2005), but exclude shorter series or those with no evidence of sensitivity to local temperature.

If this component is used by itself or in conjunction with a small number of unaffected components to perform reconstruction, the resulting temperature reconstruction may exhibit a trend, even though the individual proxies do not.