Sentences with phrase «esper reconstruction»

Not exact matches

Moreover that reconstruction is incompatible with Huang and Pollack's 500 year reconstructions (and the various MBH etc hockey sticks including Esper.

In In the Esper et al. 2002 reconstruction paper, the authors conclude: Therefore, the large multicentennial differences between RCS and MBH are real and would seem to require a NH extratropical forcing to explain them, one that attenuates toward the equator.

In a good number of the reconstructions, the sampling is largely of the extratropics, and the estimates largely represent extratropical temperature changes (e.g. Esper et al, 2003).

This does two things that may be important: it allows the non-annually resolved proxies to be used (recent previous reconstructions, e.g. MBH98, Esper et al., used only those with at least a value each year, to allow calibration against the instrumental record; Moberg's approach allows the use of data that only provide 50 y means); and it throws away the long - term signal from the tree rings, which they consider to be untrustworthy.

In In the Esper et al. 2002 reconstruction paper, the authors conclude: Therefore, the large multicentennial differences between RCS and MBH are real and would seem to require a NH extratropical forcing to explain them, one that attenuates toward the equator.

Moreover that reconstruction is incompatible with Huang and Pollack's 500 year reconstructions (and the various MBH etc hockey sticks including Esper.

It's quite difficult to judge on Wikipedia plot, but Esper and Moberg reconstructions seem to have the same trends at centennial scale (even if Esper's one have globally more amplitude than all others).

Tom Crowley (AGU Transactions, 2003) has shown that the Esper et al reconstruction yields a negative sensitivity to solar forcing using his estimated solar irradiance reconstruction, despite its very large amplitude.

But they also both happen to be essentially uncorrelated with each other at centennial timescales (see the Wikipedia plot), and Esper et al is actually negatively correlated with most reconstructions of Solar Irradiance.

If more recent proxies are used (Esper, Moberg, bore hole reconstructions), the influence of volcanic in the total variability reduces to ~ 14 %, instead of 50 %.

The reconstruction by Esper is only based on tree rings.

And for 1600 - 1900, period of interest for Nicola's paper, Moberg, Esper, Huang (and even Briffa) reconstructions seem to have a comparable slope.

We have also carefully studied the data and methods of the major multiproxy studies used in the reconstruction of surface temperatures for the past millennium [Mann et al., 1998; Mann et al, 1999; Jones et al 1998; Crowley and Lowery 2000; Esper et al, 2002; Mann and Jones, 2003; Jones and Mann, 2004; Moberg et al, 2005; Osborn and Briffa, 2006].

Depending of the reconstruction one prefers, we may assume that the LIA was about 0.8 degr.C colder than today (Moberg, Esper, Huang).

The contributions to different reconstructions are indicated by different line styles (Briffa et al.: solid, fat; Esper et al.: dotted; Moberg: dashed; CH - blend: solid, thin; with shaded 90 % confidence limits around best estimates for each detectable signal).

Mosh, there is no blade on the Esper et al reconstruction.

Examination of the NGDC data base indicates that the original Esper et al. reconstruction appears to be from the Boniface site.

Jan Esper, prominent in early Climate Audit posts as an adamant serial non-archiver, has joined with 17 other tree ring specialists, to publish «Ranking of tree - ring based temperature reconstructions of the past millennium» (pdf).

If the Polar Urals Update from Esper is used in Briffa instead of Yamal, then the MWP in the reconstruction is higher than shown.

Unlike the MBH reconstruction, which tracks the instrumental record well through the end of the calibration interval (1980), the Esper et al reconstruction indeed doesn't show any warming after 1950 or so, which defies evidence from the instrumental record.

Their reconstruction, similar to that of Esper et al. (2002), displays a large amplitude of change during the past 1 kyr, associated with notably cool excursions during most of the 9th, 13th and 14th centuries, clearly below those of most other reconstructions.

Torneträsk tree growth is representative of a wide area in northern Fennoscandia (Briffa et al. 1992; Gouirand et al. 2007) and the tree - ring data have been used in a number of high resolution large - scale climate reconstructions (Jones et al. 1998; D'Arrigo et al. 1999; Mann et al. 1999; Briffa 2000; Briffa et al. 2002b; Esper et al. 2002; Mann and Jones 2003; Luterbacher et al. 2004; Moberg et al. 2005) with the objective to place the documented late - twentieth century temperature increase (IPCC 2007) in a longer time - scale perspective.