Sentences with phrase «changing mean global temperatures»

«Two questions were key: have mean global temperatures risen compared to pre-1800s levels, and has human activity been a significant factor in changing mean global temperatures.

, while 75 of 77 (97.4 %) respondents answered «Yes» to Question 2» Do you think human activity is a significant contributing factor in changing mean global temperatures?»

The second question asked: «Do you think human activity is a significant contributing factor in changing mean global temperatures?»

Doran and Zimmerman (2009) surveyed Earth scientists, and found that of the 77 scientists responding to their survey who are actively publishing climate science research, 75 (97.4 %) agreed that «human activity is a significant contributing factor in changing mean global temperatures.»

In January 2009, a poll of 3146 earth scientists found that 82 % answered yes to the question: «Do you think human activity is a significant contributing factor in changing mean global temperatures?».

A more recent survey of earth scientists asked the question «Do you think human activity is a significant contributing factor in changing mean global temperatures?».

Figure 1: Response to the survey question «Do you think human activity is a significant contributing factor in changing mean global temperatures?»

Would Linzden answer yes with this statement: «Do you think human activity is a significant contributing factor in changing mean global temperatures?»

To state that 97 % of climate scientists agree that «human activity is a significant contributing factor in changing mean global temperatures» is another example of the circular logic that seems to be a hallmark of «The Science».

Oh, and specifically it's no longer useful to cite Doran 2009 which asked if «human activity is a significant contributing factor in changing mean global temperatures».

They correctly identify, as well, a 2009 survey of 3,146 earth scientists that asked the question, «Do you think human activity is a significant contributing factor in changing mean global temperatures?»

Do you think human activity is a significant contributing factor in changing mean global temperatures?»

Interestingly, only 64 % of meteorologists thought human activity is a significant contributing factor in changing mean global temperatures!

Responses to the question: «Do you think human activity is a significant contributing factor in changing mean global temperatures?»

``... about 58 % of the general public in the US thinks that human activity is a significant contributing factor in changing the mean global temperature, as opposed to 97 % of specia lists surveyed.»

According to a recent article in Eos (Doran and Zimmermann, «Examining the Scientific consensus on Climate Change `, Volume 90, Number 3, 2009; p. 22 - 23 — only available for AGU members — update: a public link to the article is here), about 58 % of the general public in the US thinks that human activity is a significant contributing factor in changing the mean global temperature, as opposed to 97 % of specialists surveyed.

Not exact matches

«We really can't detect these changes yet in the existing data in the way we can detect in changes, for example, in the global mean temperature,» he said.

It explores a number of different climate change futures — from a no - emissions - cuts case in which global mean temperatures rise by 4.5 °C, to a 2 °C rise, the upper limit for temperature in the Paris Agreement.

Water changes temperature more slowly than the air or land, which means the global ocean heat is likely to persist for some time.

In its recent Assessement Report (AR5), the Intergovernmental Panel on Climate Change (IPCC) projects that global mean temperature may rise up to 5 °C elsius by the end of this century.

One could assume that there was minimal global mean surface temperature change between 1750 and 1850, as some datasets suggest, and compare the 1850 - 2000 temperature change with the full 1750 - 2000 forcing estimate, as in my paper and Otto et al..

As alluded to in our post, one important issue is the possibility that changes in El Nino may have significantly offset opposite temperature variations in the extratropics, moderating the influence of the extratropical «Little Ice Age» and «Medieval Warm Period» on hemispheric or global mean temperatures (e.g. Cobb et al (2003).

While ECS is the equilibrium global mean temperature change that eventually results from atmospheric CO2 doubling, the smaller TCR refers to the global mean temperature change that is realised at the time of CO2 doubling under an idealised scenario in which CO2 concentrations increase by 1 % yr — 1 (Cubasch et al., 2001; see also Section 8.6.2.1).

One common measure of climate sensitivity is the amount by which global mean surface temperature would change once the system has settled into a new equilibrium following a doubling of the pre-industrial CO2 concentration.

The team increased one forcing agent (see sidebar) in a climate model, for example carbon dioxide, and decreased another, say methane, so that global mean temperature didn't change.

The global mean temperature rise of less than 1 degree C in the past century does not seem like much, but it is associated with a winter temperature rise of 3 to 4 degrees C over most of the Arctic in the past 20 years, unprecedented loss of ice from all the tropical glaciers, a decrease of 15 to 20 % in late summer sea ice extent, rising sealevel, and a host of other measured signs of anomalous and rapid climate change.

[T] he idea that the sun is currently driving climate change is strongly rejected by the world's leading authority on climate science, the U.N.'s Intergovernmental Panel on Climate Change, which found in its latest (2013) report that «There is high confidence that changes in total solar irradiance have not contributed to the increase in global mean surface temperature over the period 1986 to 2008, based on direct satellite measurements of total solar irradiance.&change is strongly rejected by the world's leading authority on climate science, the U.N.'s Intergovernmental Panel on Climate Change, which found in its latest (2013) report that «There is high confidence that changes in total solar irradiance have not contributed to the increase in global mean surface temperature over the period 1986 to 2008, based on direct satellite measurements of total solar irradiance.&Change, which found in its latest (2013) report that «There is high confidence that changes in total solar irradiance have not contributed to the increase in global mean surface temperature over the period 1986 to 2008, based on direct satellite measurements of total solar irradiance.»

Today we understand the impact of human activities on global mean temperature very well; however, high - impact extreme weather events are where the socio - economic impacts of a changing climate manifest itself and where our understanding is more in its infancy but nevertheless developing at pace.

A shifting mean (as in warming global temperatures) leads to large changes at the extremes.

On shorter time scales, however, changes in heat storage (i.e., ocean heat uptake or release) can affect global mean temperature.

He then uses what information is available to quantify (in Watts per square meter) what radiative terms drive that temperature change (for the LGM this is primarily increased surface albedo from more ice / snow cover, and also changes in greenhouse gases... the former is treated as a forcing, not a feedback; also, the orbital variations which technically drive the process are rather small in the global mean).

To contribute to an understanding of the underlying causes of these changes we compile various environmental records (and model - based interpretations of some of them) in order to calculate the direct effect of various processes on Earth's radiative budget and, thus, on global annual mean surface temperature over the last 800,000 years.

ECS is defined in terms of global mean temperature change, not separately for land and ocean.

The diagnostics, which are used to compare model - simulated and observed changes, are often simple temperature indices such as the global mean surface temperature and ocean mean warming (Knutti et al., 2002, 2003) or the differential warming between the SH and NH (together with the global mean; Andronova and Schlesinger, 2001).

More recently Köhler et al (2010)(KEA), used estimates of all the LGM forcings, and an estimate of the global mean temperature change, to constrain the sensitivity to 1.4 - 5.2 ºC (5 — 95 %), with a mean value of 2.4 ºC.

Based on regional studies, the Intergovernmental Panel on Climate Change (IPCC) estimated that 20 — 30 % of the world's species are likely to be at increasingly high risk of extinction from climate change impacts within this century if global mean temperatures exceed 2 — 3 °C above pre-industrial levels [6], while Thomas et al. [5] predicted that 15 — 37 % of species could be «committed to extinction» due to climate change byChange (IPCC) estimated that 20 — 30 % of the world's species are likely to be at increasingly high risk of extinction from climate change impacts within this century if global mean temperatures exceed 2 — 3 °C above pre-industrial levels [6], while Thomas et al. [5] predicted that 15 — 37 % of species could be «committed to extinction» due to climate change bychange impacts within this century if global mean temperatures exceed 2 — 3 °C above pre-industrial levels [6], while Thomas et al. [5] predicted that 15 — 37 % of species could be «committed to extinction» due to climate change bychange by 2050.

Abstract:» The sensitivity of global climate with respect to forcing is generally described in terms of the global climate feedback — the global radiative response per degree of global annual mean surface temperature change.

Using a statistical model calibrated to the relationship between global mean temperature and rates of GSL change over this time period, we are assessing the human role in historic sea - level rise and identifying human «fingerprints» on coastal flood events.

The study examines permafrost carbon emissions in various climate models and under different scenarios, finding that the extra boost to warming from thawing permafrost could be 0.2 - 12 % of the change in global mean temperature.

[9] Temperature changes Global mean surface temperature difference from the average for 1880 &mTemperature changes Global mean surface temperature difference from the average for 1880 &mtemperature difference from the average for 1880 — 2009.

But global mean temperature evolution alone can't tell us how climate and weather are changing on the ground, where people live.

Here's the problem forests and forest managers face under climate change: Increasing global mean temperatures, changes in precipitation, and the hydrologic cycle are expected to lead to temperature and drought stress for many tree species.

First let's define the «equilibrium climate sensitivity» as the «equilibrium change in global mean surface temperature following a doubling of the atmospheric (equivalent) CO2 concentration.

The adjustments are unlikely to significantly affect estimates of century - long trends in global - mean temperatures, as the data before, 1940 and after the mid-1960s are not expected to require further corrections for changes from uninsulated bucket to engine room intake measurements.

As alluded to in our post, one important issue is the possibility that changes in El Nino may have significantly offset opposite temperature variations in the extratropics, moderating the influence of the extratropical «Little Ice Age» and «Medieval Warm Period» on hemispheric or global mean temperatures (e.g. Cobb et al (2003).

While the local, seasonal climate forcing by the Milankovitch cycles is large (of the order 30 W / m2), the net forcing provided by Milankovitch is close to zero in the global mean, requiring other radiative terms (like albedo or greenhouse gas anomalies) to force global - mean temperature change.

... Polar amplification explains in part why Greenland Ice Sheet and the West Antarctic Ice Sheet appear to be highly sensitive to relatively small increases in CO2 concentration and global mean temperature... Polar amplification occurs if the magnitude of zonally averaged surface temperature change at high latitudes exceeds the globally averaged temperature change, in response to climate forcings and on time scales greater than the annual cycle.

However, and this is important, because of the biases and the difficulty in interpolating, the estimates of the global mean absolute temperature are not as accurate as the year to year changes.

Overall, ecosystem - driven changes in chemistry induced climate feedbacks that increased global mean annual land surface temperatures by 1.4 and 2.7 K for the 2 × and 4 × CO2 Eocene simulations, respectively, and 2.2 K for the Cretaceous (Fig. 3 E and F).

[Response: I suspect another common confusion here: the abrupt glacial climate events (you mention the Younger Dryas, but there's also the Dansgaard - Oeschger events and Heinrich events) are probably not big changes in global mean temperature, and therefore do not need to be forced by any global mean forcing like CO2, nor tell us anything about the climate sensitivity to such a global forcing.