Sentences with phrase «holocene temperatures»

It's not out of the realm of possibility, and it's probably the main reason for Hansen's concern about going much beyond prior Holocene temperatures.

Similarly, Mcintyre's body of work on hockey stick would be a stronger example of the failure of conventional scientific processes if subsequent research did not continually reproduce the same general shape of Holocene temperatures.

I'm not an expert on earlier papers on holocene temperatures, but no one has protested (as far ad I know) on their claim that their paper is the first to present results of comparable quality.

For example: Marsicek et al «Reconciling divergent trends and millennial variations in Holocene temperatures» Nature 554:92 - 96 2018 So nothing really amiss on the science side — in terms of our human emotions and tendency to personalize and argue — that's another matter altogether.

Quantitative reconstruction of Holocene temperatures across the Canadian Arctic and Greenland.

At least in south Greenland, these 10Be ages likely provide a minimum constraint for when on a multicentury timescale summer temperatures after the last deglaciation warmed above late Holocene temperatures in the early Holocene.

1) Early Holocene temperatures only 2 - 3c warmer than present 2) Climate variability exceeds insolation forcing

Although our temperature stack does not fully resolve variability at periods shorter than 2000 years, such high - frequency changes would only modestly broaden the statistical distribution of Holocene temperatures (Fig. 3 and fig.

In reality Holocene temperatures are progressing towards a pretty obvious target and the cycles of warm and cold are not a repetition but a progression.

Taking advantage of that they can compare the Holocene temperatures with the present ones and with projections to the future.

So the non tree historic temperatures now gives a MWP / LIA difference of 0,8 K like the (non tree) Holocene temperatures, fig 5.

So far, what we have is a relatively unexceptional plotting of early Holocene temperatures.

Reconstructing holocene temperatures is no longer just acedemic when we are pouring 30 + billion tons of CO2 into the atmosphere a year.

Global versus Greenland Holocene Temperatures.

First of all, there has been some concern about the temperatures reported in the 2010 being inconsistent with the Holocene temperatures reported in our 2008 Science paper.

Bryan Shuman, a UW professor in the Department of Geology and Geophysics, and Jeremiah Marsicek, a recent UW Ph.D. graduate in geology and geophysics, led the new study that is highlighted in a paper, titled «Reconciling Divergent Trends and Millennial Variations in Holocene Temperatures,» published today (Jan. 31) in Nature.

It's theoretically possible that some internal cycle in the ocean circulation could give Holocene temperature fluctuations as big as the LIA, but until one identifies such a mechanism, it's essentially impossible to say what the consequences would be for climate sensitivity.

Moreover, there is a little matter of «The Holocene Temperature Conundrum».

See: Liu, Z., Zhu, J., Rosenthal, Y., Zhang, X., Otto - Bliesner, B. L., Timmermann, A., Smith, R. S., Lohmann, G., Zheng, W. and Timm, O. E. (2014) «The Holocene temperature conundrum», Proceedings of the National Academy of Sciences, vol.

Instead, he wants us to focus on all the squiggles in the Holocene temperature reconstructions.

It's theoretically possible that some internal cycle in the ocean circulation could give Holocene temperature fluctuations as big as the LIA, but until one identifies such a mechanism, it's essentially impossible to say what the consequences would be for climate sensitivity.

Richard Alley of Penn State, who'd been on the road when first queried, just sent this cogent and helpful analysis of the new Holocene temperature reconstruction:

In this study, which was led by Oregan State University, funded by the US National Science Foundation's Paleoclimate Program and just published in Science, researchers used «extensive sea and land surface temperature reconstructions» of around 21,000 years ago — in stead of the (late) Holocene temperature record that is mostly used.

Figure 1: Global temperature relative to peak Holocene temperature, based on ocean cores.

Holocene temperature records show millennial - scale periodicity.

By Andy May The only recent attempt at a global Holocene temperature reconstruction available today is the one by Marcott, et al. (2013), the paper abstract can be viewed here.

Figure 6 (source) A Holocene Temperature Reconstruction Part 1: the Antarctic.

A Holocene Temperature Reconstruction Part 2: More reconstructions.

A Holocene Temperature Reconstruction Part 3: The NH and Arctic.

The ice margin near Jakobshavn thus underwent large and rapid adjustments in response to relatively modest centennial - scale Holocene temperature changes, which may foreshadow GIS response to future warming.

kim, I get that this is all a personal attack on young scientist named Marcott, but it distracts from what the Holocene temperature record actually says, which is a lot like Marcott showed.

The Marcott et al. conclusions that «Current global temperatures of the past decade... are warmer than during ~ 75 % of the Holocene temperature history» and «Global mean temperature for the decade 2000 - 2009....

Maybe for > 10,000 years, but isn't it a bit misleading, since the Holocene temperature maximum was about 8 ka BP and sea levels reached their maximum ~ 7 ka BP.

«Earth at peak Holocene temperature is poised such that additional warming instigates large amplifying high - latitude feedbacks.

Moreover, we suggest that accounting for any spatial or seasonal biases in the stack would tend to reduce its variability because of the cancellation of noise in a large - scale mean and the opposing nature of seasonal insolation forcing over the Holocene, causing the Holocene temperature distribution to contract.

The key words for that abstract BTW are «global temperature, Holocene temperature, model - data inconsistency»

Intergovernmental Panel on Climate Change model projections for 2100 exceed the full distribution of Holocene temperature under all plausible greenhouse gas emission scenarios.

Placing the climate limits in an enlarged paleoclimatic context will help to demonstrate that the chosen climate targets are valid and represent dangerous extremes of the known natural range of Holocene temperature variability.

See: Craig Loehle & Fred Singer, Holocene temperature records show millenia scale periodicity Can.

That's all the Holocene temperature has been: irregular corrugations, ups and downs, fluctuations.

The low estimates of climate sensitivity by Chylek and Lohmann (2008) and Schmittner et al. (2011), ~ 2 °C for doubled CO2, are due in part to their inclusion of natural aerosol change as a climate forcing rather than as a fast feedback (as well as the small LGM - Holocene temperature change employed by Schmittner et al., 2011).»

In contrast to IPCC models that predict more warming that Hoegh - Guldberg ties to coral demise, climate experts note the Holocene temperature conundrum.

... I see the proxy mean and its fluctuations, and I get that to stitch together the entire Holocene temperature record it requires at least 3 proxies (Marcott et al, Mann et al or your one of preference, and the instrument record), each with their own error bars.

Given a Holocene temperature of 14.15 °C and LGM cooling of 4.5 °C, the Early Pliocene mean temperature 3 °C warmer than the Holocene leads to the following prescription: 4.1 and 4.2 This prescription yields a maximum Eemian temperature of 15.56 °C, which is approximately 1.4 °C warmer than the Holocene mean and approximately 1.8 °C warmer than the 1880 — 1920 mean.

... [For Steve Mc] to make and publish a better Holocene temperature reconstruction?

The article itself presents a Holocene temperature reconstruction that is very much at odds both with Marcott et al 2013 and Mann et al 2008.

Given your profound knowledge of Holocene climate proxies, your ample statistical knowledge, and the pitiful lack of a reliable Holocene temperature reconstruction, wouldn't you attempt to make and publish a better Holocene temperature reconstruction?

So you do not accept the MWP or RWP, or even the Holocene temperature as being higher than present for much of the first half of the last 11,000 y?

There is another recent paper which hints at the models being flawed: The Holocene temperature conundrum.

Holocene Temperature Records Show Millennial - Scale Periodicity.