Sentences with phrase «unprecedented warm temperatures»

Unprecedented warm temperatures lead to the loss of more than half of the sea ice cover in the Bering Sea in two weeks, resulting in record lows for Arctic Ocean sea ice extent for the month of February.

Not exact matches

Schmidt's rough estimate, which he posted on Twitter, is based on the extraordinary and unprecedented warming over the past 12 months, during which time global surface temperatures have shot past the 1 °C above pre-industrial level.

The changes in tree - ring width are closely correlated with temperature, the study concludes: recent warming in western US is the best explanation for last century's unprecedented growth spurt.

The historic temperature record is a massively important part of this jigsaw though, because it can tell us if todays warming is within natural variability or quite unprecedented, and it is also used to «tune» computer models (not that this has any great meaning — another story!).

One reason why recognizing the importance of the fact that Mann's statistical methods and hence conclusions are faulty is that to demonstrate that the current warming is unprecedented and therefore likely anthropogenic is that sufficiently precise paleoclimate temperature indicators and data is hard to come by.

In these high latitudes, temperatures are predicted to warm so fast and to such a degree so as to cause unprecedented melting of ice that even the most ardent of climate skeptics would be forced to concede the verity of global warming theory.

While the planet's surface temperatures over the past century have risen to unprecedented levels, records have shown a slowdown in the pace of warming over the past 15 years.

I was somewhat involuntarily thrust into the center of the public debate over climate change at this very time, when the «Hockey Stick» temperature reconstruction I co-authored, depicting the unprecedented nature of modern warming in at least the past millennium, developed into an icon in the debate over human - caused climate change [particularly when it was featured in the Summary for Policy Makers (SPM) of the Third Assessment Report of the IPCC in 2001].

The rate and magnitude of 20th century warming are thus unknowable, and suggestions of an unprecedented trend in 20th century global air temperature are unsustainable.

Warmer temperatures at high latitudes are already resulting more frequent Arctic fires, and unprecedented permafrost thaw is leaving large soil carbon pools exposed to smoldering fires for the fist time since ancient times.

The record - breaking year of 2005 had below - average dust over the Atlantic, very warm sea surface temperatures, and an unprecedented four hurricanes that reached category 5, the highest classification.

There is nothing «natural» about these extremes of weather over the last 2 years, or about the unprecedented ozone hole in the Arctic last year (troposphere warming from greenhouse gases caused stratospheric cooling to below threshold temperature for polar stratospheric cloud generation and ozone destruction).

It has been claimed that late 20th Century was unprecedented in temperature and that nothing could have caused the warming except CO2.

- temperature trends are unprecedented in the last 2000 years - temperatures are unprecedented in 10000000 years - hurricane PDI has doubled in the last 30 years - GCMs are the best proof we have of the inevitability of CO2 - caused warming of 3 ± 1 °C

Of these surely the one labelled «global temperatures» is the most absurd yet most frequently referred to as some sort of definitive proof of unprecedented warming.

But if the MWP was restricted to mild local warming, it would mean that present - day global warming is unprecedented for the past 1,000 years, as claimed by climatologist Michael Mann of Pennsylvania State University, University Park, in his famous «hockey stick» global temperature reconstruction3.

The Met Office says it doesn't expect temperature records to be broken every year, but «the current situation shows how global warming can combine with smaller, natural fluctuations to push our climate to levels of warmth which are unprecedented in the data records».

Keith Briffa, whose team reconstructed the contradictory temperature graph, was furious, and wrote: «I know there is pressure to present a nice tidy story as regards «apparent unprecedented warming in a thousand years or more in the proxy data.»»

Using a large volume of 126 proxy temperature records from the Northern Hemisphere, they found (1) a clearly discernible Medieval Warm Period (MWP)(950-1150) and Little Ice Age (LIA)(1450 - 1850), (2) «likely unprecedented» modern temperatures (relative to the last 1,000 years), as well as a (3) «significant» link between the high temperatures of the MWP and recent times and the high solar activity that characterized both periods (the Medieval Maximum and the Modern Grand Maximum).

In his recently published study in the journal Nature, Temperatures blown off course, he explains how unprecedented trade winds have shifted heat into the ocean thermocline - between 100 metres and 300 metres - and that this is the primary cause of the global warming pause.

For Bender: why the hockey stick matters: 1) it is used to prove the sun does not have a big effect 2) it is used to test / tune GEMs and estimate CO2 sensitivity 3) it is used to argue that temperatures are unprecedented 4) it is used to argue therefore that organisms and man are not able to adapt to this warming 5) it is useful for whacking deniers

The UN IPCC rewrote the Earth's temperature record in order to promote the «Unprecedented 20th Century Warming» belief.

I did show longer time scales on the temperature data and proxies not so much to discredit the deceiving hockey stick, but to address the overwhelming belief by the public and policy makers that the current warming is «unprecedented», «dangerous» and nearing a «tipping point».

One reason why recognizing the importance of the fact that Mann's statistical methods and hence conclusions are faulty is that to demonstrate that the current warming is unprecedented and therefore likely anthropogenic is that sufficiently precise paleoclimate temperature indicators and data is hard to come by.

«Unprecedented levels of high temperature in the last decades (Barber, 2004) have led to nonlinear patterns of white spruce tree growth responses to warming at Alaska's treeline and temperature thresholds appear to be operating.

Temperatures recover to basically a flat line from 1500 onward, until the «unprecedented» 20th century warming.

At some time or another, most people will have seen the hockey stick - the iconic graph which purports to show that after centuries of stable temperatures, the second half of the twentieth century saw a sudden and unprecedented warming of the globe.

Yet, it is still a widely accepted myth for periods since 1980 - that human CO2 has caused unprecedented temperature increases, far outpacing any previous 20th century warming increases.

That's why Michael Mann was heralded as a climate change hero when he sacrificed his career as a respectable scientist to create a bogus historical temperature reconstruction which deleted all past climate variation of the last 2,000 years so that modern warming would appear as an UNPRECEDENTED!

If the earlier warm period was comparable to the recent warm period, then claims that recent global temperature trends are unprecedented or unusual will need to be re-evaluated.

«Climate science» as it is used by warmists implies adherence to a set of beliefs: (1) Increasing greenhouse gas concentrations will warm the Earth's surface and atmosphere; (2) Human production of CO2 is producing significant increases in CO2 concentration; (3) The rate of rise of temperature in the 20th and 21st centuries is unprecedented compared to the rates of change of temperature in the previous two millennia and this can only be due to rising greenhouse gas concentrations; (4) The climate of the 19th century was ideal and may be taken as a standard to compare against any current climate; (5) global climate models, while still not perfect, are good enough to indicate that continued use of fossil fuels at projected rates in the 21st century will cause the CO2 concentration to rise to a high level by 2100 (possibly 700 to 900 ppm); (6) The global average temperature under this condition will rise more than 3 °C from the late 19th century ideal; (7) The negative impact on humanity of such a rise will be enormous; (8) The only alternative to such a disaster is to immediately and sharply reduce CO2 emissions (reducing emissions in 2050 by 80 % compared to today's rate) and continue further reductions after 2050; (9) Even with such draconian CO2 reductions, the CO2 concentration is likely to reach at least 450 to 500 ppm by 2100 resulting in significant damage to humanity; (10) Such reductions in CO2 emissions are technically feasible and economically affordable while providing adequate energy to a growing world population that is increasingly industrializing.

I find it amusing that they're referring to a.9 degree Celsius warming as being «unprecedented» considering that by comparison, there are larger temperature swings than noted in the study by the Brown University group.

«Unprecedented temperatures and a... decrease in productivity can be attributed to (human)... global warming.»

COMMON MISCONCEPTIONS ABOUT GLOBAL WARMING MYTH 1: Global temperatures are rising at a rapid, unprecedented rate.

Joshua, the first sentence of the Marcott abstract, «Surface temperature reconstructions of the past 1500 years suggest that recent warming is unprecedented in that time» Now when you dig through the paper and check the supplements you find that that statement is «not robust».

«Joshua, the first sentence of the Marcott abstract, «Surface temperature reconstructions of the past 1500 years suggest that recent warming is unprecedented in that time»» Yes, it does.

Even the case «Marcott et al» did not prove that the current high temperature could be unprecedented, on basis of which the recent global warming can be regarded as well as natural as human - made.

Based on land - surface temperatures, Africa does not appear to be affected by the «unprecedented» global warming due to the «unprecedented» global CO2 levels, which represents a catastrophic prediction failure by the IPPC and its climate models.

«Given that the current upward trend in temperatures is not unprecedented, it stands to reason that minor warming will not lead to unprecedented catastrophes, and scientific evidence confirms this.»

But since then there has been rapid, unprecedented, warming so that by the end of the most recent decade (2000 - 2009) temperatures were warmer than about 82 % of all decades in the past 12,000 years.

The UK's HadCRUT4 global empirical evidence makes it very clear: modern acceleration of warming temperatures is not unprecedented, nor unusual due to CO2 emissions; nor does the modern period exhibit any warming trend that comes close to even 1.5 °C per century.

Surface temperature reconstructions of the past 1500 years suggest that recent warming is unprecedented in that time.

In testimony before the US Senate in 2003, he stated: It is the consensus of the climate research community that the anomalous warmth of the late 20th century can not be explained by natural factors, but instead indicates significant anthropogenic, that is human influences... More than a dozen independent research groups have now reconstructed the average temperature of the northern hemisphere in past centuries... The proxy reconstructions, taking into account these uncertainties, indicate that the warming of the northern hemisphere during the late 20th century... is unprecedented over at least the past millennium and it now appears based on peer - reviewed research, probably the past two millennia.

If the claim of the paper is going to be about about annual temperature changes and unprecedented warming and not confined to a claim about SONDJF then I would think annual temperatures should be used for the (incorrect) post fact proxy selection criteria.

«Warmer temperatures at high latitudes are already resulting in unprecedented permafrost degradation,» he says.

And it was just one in a long series of threats I've received since the late 1990s, when my research illustrated the unprecedented nature of global warming, producing an upward - trending temperature curve whose shape has been likened to a hockey stick.

If you have a Medieval Warming Period (MWP)-- then temperatures * aren't * unprecedented and become mathematically decoupled from CO2.

You're no doubt aware by now that the Arctic is melting at unprecedented rates and by and large the world's glaciers are retreating, both with the blame placed on warming temperatures.

However I do think that there a number of arguments that speak against an important anthropogenic contribution to observed temperatures changes in the past century: - The 1910 - 1945 allegedly unprecedented warming, in spite of the small impact of GHGs at the time.

Recent analyses of instrumental, documentary and proxy climate records, focussing on European temperatures, have also pointed to the unprecedented warmth of the 20th century and shown that the extreme summer of 2003 was very likely warmer than any that has occurred in at least 500 years (Luterbacher et al., 2004; Guiot et al., 2005; see Box 3.6).