Sentences with phrase «past present temperatures»

Not exact matches

Around 3 million years ago, when temperatures were just 1 to 2 °C higher than the average of the past couple of millennia before humans began warming the climate, sea level was at least 25 metres higher than present.

We present a synthesis of decadally resolved proxy temperature records from poleward of 60 ° N covering the past 2000 years, which indicates that a pervasive cooling in progress 2000 years ago continued through the Middle Ages and into the Little Ice Age.

We present tree ring — based reconstructions of central European summer precipitation and temperature variability over the past 2500 years.

The changes in the temperature data consistently make the past seem cooler, which in turn makes the present seem warmer.

For the legions of attendees who were present at Subiefest 2015 this past Saturday at the Auto Club Speedway in Fontana, CA, the 107 - degree temperature was made bearable by a....

Jacob (and many, many others) seem to think that if model A, when run from 1900 to present, predicts the relatively flat, global average surface temperature record over the past decade, is a better match to reality than model B which does not.

Confident assertions, for example, have been made in this very forum, that climatic states in the past 1000 years have never matched the present - state, based on the simple fact that the paleo temperatures of the MWP never reach the mythical heights the instrumental proxy of the present day.

They neglect the pre-1980s temperatures, the post-2000 temperatures, and the recent millennium of historical temperatures — they take a few unidentified data points out of a long series that support their desired point — fail to mention those data points and past trends that refute their point — and assert that they have presented a valid overall picture — in short, cherry - picking.

[Response: If it were indeed true that CO2 always lags temperature changes, never leads (which I don't believe) then what you would have proved is that past analoges are of limited value to assessing the present warming, because in this case we do know that the forcing if from GHG's, since we know the CO2 increase is anthro — William]

However, I tracked down the Huang paper (1997, GRL 24, 1947), but only got the abstract, and it does seem to indicate that they conclude that temperatures were higher in the not - too - distant past than at present.

As presented below, the temperature record of each of these groups (available at the URLs given at the bottom of this message) shows the same features: (i) a warming of about 0.9 °C (1.6 °F) over the past 150 years and (ii) natural variability with both short and long periods.

I still do not correctly understand how the calculation of CO2 sensitivity in past or present climates can be independant from the estimation of the other forcings related to temperature trends (and from natural / chaotic variability).

Von Storch disagrees with Mann about the degree of variability in past temperatures before the present warming.

Due to past and present greenhouse gas emissions from predominantly developed countries, the temperatures of our atmosphere and thus many of our sea waters are increasing.

Despite its fundamental problems, Spencer's internal variability hypothesis was probably the best alternative presented to this point, and Dessler drove another nail into its coffin by demonstrating what a small effect clouds have had on global temperature changes over the past decade.

What both of these temperature curves show is that virtually all of the past 10,000 years has been warmer than the present.

So an obvious question presents itself: if the warming of about 0.4 degrees C in temperatures in southeastern Australia in the 1970s, 1980s and 1990s caused the lower rainfall of the recent past, why was the warming of 0.4 degrees C in the 1950s and 1960s followed by a period of above - average rainfall?

EVERY revision of NASA data has had the effect of producing greater warming in the present and greater cooling of the past (increasing temperature trends where the raw data have none).

Some argue that if the tree - ring data are unreliable for the recent past, including them in older temperature reconstructions is highly questionable, and could understate historic warming — including the MWP — relative to the present day.

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.

One, Hans von Storch of Germany's GKSS center, has presented theoretical findings arguing that Dr. Mann's technique could sharply underestimate past temperature swings.

A global - scale instrumental temperature record that has not been contaminated by (a) artificial urban heat (asphalt, machines, industrial waste heat, etc.), (b) ocean - air affected biases (detailed herein), or (c) artificial adjustments to past data that uniformly serve to cool the past and warm the present... is now available.

Ultimately, we show that present temperature abnormalities are given undue weight and lead to an overestimation of the frequency of similar past events, thereby increasing belief in and concern for global warming.

When he presented his misleading graph, when he said 97 % of climate scientists agree, (knowing full well the actual situation that the number is bogus and misleading,) when he mentions adjustments to satellite data but not to surface temperatures with major past cooling and absurd derived precision to.005 * C, when he defends precision in surface global averages but ignores major estimates of temps and krigging in Arctic, Africa, Asia and oceans or Antarctica, he forfeits credibility.

Carbon dioxide measurements on Dome C ice, focusing on the interval 390 to 650 kyr before present, bp (2,700 — 3,060 m) 4, confirmed the strong coupling between CO2 and Antarctic temperature found1 in the Vostok ice core for the past 420 kyr.

The scientists examined surveys of the ratio of strontium to calcium content and heavy oxygen isotopes, both are sensitive recorders of sea surface temperatures past and present.

Quantitatively, Vasskog et al. estimate that during this time (the prior interglacial) the GrIS was «probably between ~ 7 and 60 % smaller than at present,» and that that melting contributed to a rise in global sea level of «between 0.5 and 4.2 m.» Thus, in comparing the present interglacial to the past interglacial, atmospheric CO2 concentrations are currently 30 % higher, global temperatures are 1.5 - 2 °C cooler, GrIS volume is from 7 - 67 % larger, and global sea level is at least 0.5 - 4.2 m lower, none of which observations signal catastrophe for the present.

The red line indicates the peak temperature anomaly of the past century, the blue line indicates the current temperature anomaly, the shaded red circles indicate periods in which temperatures were warmer than the peak warmth of the past century, and the shaded blue circles indicate periods during the past century that were colder than present.

Story submitted by Cornelis de Jager (past president ICSU; past pres. COSPAR) In a recent publication entitled Terrestrial ground temperature variation in relation to solar magnetic variability, including the present Schwabe cycle, Cornelis (Kees) de Jager and Hans Nieuwenhuijzen, from the Space Research Organisation of the Netherlands have analysed the dependence of the global earth temperature...

In the climate debate, the temperatures of the past are used to determine if the present temperatures are unique and alarming.

There are no reliable past or present temperature data, it is just that some of them are much worse than others; hence there are no the «best», perhaps only the Cautiously Estimated Tempertemperature data, it is just that some of them are much worse than others; hence there are no the «best», perhaps only the Cautiously Estimated TemperatureTemperature data.

There are no reliable past or present temperature data, it is just that some of them are much worse than others

The present is getting warmer, the past is getting cooler, and it has nothing to do with real temperature data - only adjustments to temperature data.

Therefore, in a subsequent MAGICC run we replaced our ice core — based reconstruction with Sato's [Sato et al., 1993](and updated to present) values after 1970 and compared the model response to NH temperature reconstructions [Intergovernmental Panel on Climate Change, 2007, Figure 6.10] for the past millennium (Figure 4).

For more than 3 1/2 years, I've been presenting how sea surface temperature data indicates that ENSO is the primary cause of the warming of the past 3 decades.

The changes in the temperature data consistently make the past seem cooler, which in turn makes the present seem warmer.

The point is that comparing local averages of past with local extremes of the present selects strongly cases where the local temperatures have risen more than the average of all locations even in absence of extremes.

The problem with global temperature record graphs — even if one is able to obtain an unadjusted record going back 100 + years; is that one is not comparing the same station data from the past compared to the present.

3) Muscheler seems to be asserting that temperature has been rising for the last 30 years when it has been roughly flat for the past 15 years (a fact that presents problems for Muscheler's preferred CO2 - warming theory, but is perfectly compatible with the solar - warming theory, after cycle 23 slowed down and dropped off a cliff).

Based on proxy records from ice, terrestrial and marine archives, the LIG is characterized by an atmospheric CO2 concentration of about 290 ppm, i.e., similar to the pre-industrial (PI) value13, mean air temperatures in Northeast Siberia that were about 9 °C higher than today14, air temperatures above the Greenland NEEM ice core site of about 8 ± 4 °C above the mean of the past millennium15, North Atlantic sea - surface temperatures of about 2 °C higher than the modern (PI) temperatures12, 16, and a global sea level 5 — 9 m above the present sea level17.

The oceans are buffered by sediments and volcanic rocks on the sea floor and even in past times when atmospheric temperature and CO2 were far higher than at present, there were no acid oceans.

Over decades, improvements in observations of the present climate, reconstructions of ancient climate, and computer models that simulate past, current, and future climate have reduced some of the uncertainty in forecasting how rising temperatures will ripple through the climate system.

A temperature graph is like a piece of wet string attached at one end to the present (which is as perfect as we know how to make it) and some point in the distant and incorrigible past.

«Almost all the alterations resulted in higher temperatures being reported for the present and lower numbers for the past — with the higher numbers being used to demonstrate a historical warming trend — than the numbers that were actually recorded,» wrote Sterling.

Kaplan SST Description: This analysis uses present - day temperature patterns to enhance the meager data available in the past.

This chart plotting the IPCC's gold - standard (HC4) of global temperature trends, of past and present, reveals why it is so incredibly difficult to predict climate change, be it of short or long - term nature.

Almost all the alterations resulted in higher temperatures being reported for the present and lower numbers for the past

Atmospheric pollutants may impact India's major crops like wheat and rice more than temperature rise, says a new study based on a «regression model» that predicts future events with information on past or present events.

This is based on a range of evidence including past temperature proxies and climate histories, and present day observations.

Only if you (a) homogenize the temperature record to cool the past and warm the present and (b) ignore both satellite records since 1979, and (c) ignore that the difference is not statistically significant, and has not been for 19 years in HadCrut4 per the recent McKittrick paper.