Sentences with phrase «anthropogenic warming trends in»

Our results show significant anthropogenic warming trends in all the continental regions analyzed.

See: New paper cuts recent anthropogenic warming trend in half (h / t WUWT)

Not exact matches

But the period of time over which the team analysed the long - term trend in warming was the past 50 years, in which this oscillation hasn't changed significantly — so almost all the warming looks to have been the result of anthropogenic climate change.

Nonetheless, even if the substantial recent trend in the AO pattern is simply a product of natural multidecadal variability in North Atlantic climate, it underscores the fact that western and southern Greenland is an extremely poor place to look, from a signal vs. noise point of view, for the large - scale polar amplification signature of anthropogenic surface warming.

Our general circulation model simulations, which take into account the recently observed widespread occurrence of vertically extended atmospheric brown clouds over the Indian Ocean and Asia3, suggest that atmospheric brown clouds contribute as much as the recent increase in anthropogenic greenhouse gases to regional lower atmospheric warming trends.

For example, the borehole data show warming since about 1500 AD which clearly was not anthropogenic, and in the latest decade, since the very warm 1998, the temperature trend is downward even in the Hadley Center compilations; the most ardent supporters of anthropogenic global warming.

We know, for example, from the work of Santer et al. that the warming trend in the tropical Atlantic can not be explained without anthropogenic impacts on the climate.

Basically, all of the warming trend in the last ~ 60 yrs is anthropogenic»

If only half the warming over 1976 - 2000 (linear trend 0.18 °C / decade) was indeed anthropogenic, and the IPCC AR5 best estimate of the change in anthropogenic forcing over that period (linear trend 0.33Wm - 2 / decade) is accurate, then the transient climate response (TCR) would be little over 1 °C.

Basically, all of the warming trend in the last ~ 60 yrs is anthropogenic (a combination of greenhouse gases, aerosols, land use change, ozone etc.).

Given that the trend in global SSTs has been attributed to increases in greenhouse gases in the atmosphere (17 — 19), it follows that the best explanation for this ecosystem aberration is anthropogenic warming that has passed a threshold of natural variability.

Nonetheless, even if the substantial recent trend in the AO pattern is simply a product of natural multidecadal variability in North Atlantic climate, it underscores the fact that western and southern Greenland is an extremely poor place to look, from a signal vs. noise point of view, for the large - scale polar amplification signature of anthropogenic surface warming.

In the remainder, such increases were mostly unrelated to warming or drying trends and therefore may be due to other climate effects not explored (e.g. lightning ignitions) or possible anthropogenic influences.

Unlike a belief in leprechauns, there is a preponderance of evidence that CO2 warms the planet and that the anthropogenic contribution of CO2 to the atmosphere is causing the observed warming trend.

Mooney describes the debate over the role of natural vs. anthropogenic factors in observed tropical warming trends that have been related to increased hurricane activity, and there is a fair amount of discussion of the partisanship that high - level NOAA administrators have apparently taken in this debate.

In particular, would anyone question that the observed trends in sea surface temperature in all basins can be attributed to anthropogenic global warminIn particular, would anyone question that the observed trends in sea surface temperature in all basins can be attributed to anthropogenic global warminin sea surface temperature in all basins can be attributed to anthropogenic global warminin all basins can be attributed to anthropogenic global warming?

[Response: There is evidence that the enhanced continental winter warming in the Northern Hemisphere, which has resulted at least in part from a recent trend towards the positive phase of the Arctic Oscillation (AO), may in fact also represent a response to anthropogenic impacts on climate.

In these, despite the various minor ups and downs, the general trend is down until about 1850 CE when anthropogenic effects really started lifting the temperature, following the excess global warming (so - called greenhouse) gases.

Anthropogenic global warming (AGW), a recent warming of the Earth's lower atmosphere as evidenced by the global mean temperature anomaly trend [11], is BELIEVED to be the result of an «enhanced greenhouse effect» mainly due to human - produced increased concentrations of greenhouse gases in the atmosphere [12] and changes in the use of land [13].

Tung and Zhou repeat the analysis of Foster and Rahmstorf 2011 (PDF) in Figure 5 while also removing the AMO, and obtain an anthropogenic warming trend over the last 33 years of 0.07 °C / decade, less than half of Foster and Rahmstorf's 0.17 °C / decade.

However, Helbig et al. [2017], using a set of nested paired eddy covariance flux towers in a boreal forest - wetland landscape, point to the increasing importance of warming temperatures on ecosystem respiration potentially overwhelming enhanced productivity occurring from land cover change under projected anthropogenic trends.

Our general circulation model simulations, which take into account the recently observed widespread occurrence of vertically extended atmospheric brown clouds over the Indian Ocean and Asia, suggest that atmospheric brown clouds contribute as much as the recent increase in anthropogenic greenhouse gases to regional lower atmospheric warming trends.

This finding, though based on uncertain reconstructions of past ENSO behaviour, is entirely independent of previous analyses confined to the restricted instrumental climate record...... such a trend would seem consistent with the response to the general increase in explosive volcanism during the fifteenth — nineteenth centuries in conjunction with reduced solar irradiance that is responsible for the millennial cooling trend of Northern Hemisphere mean temperature before modern anthropogenic warming.

In its Summary, the latest IPCC report (2007) states explicitly that this reported (surface) warming trend is sure (> 90 %) evidence for anthropogenic global warming (AGW).

The late 20th century divergence is partly due to local anthropogenic warming and partly to other factors, such as longterm multicentennial linear trend in solar cycle frequency (thermal inertia of oceans and ice).

«Estimating changes in global temperature since the pre-industrial period» «A reassessment of temperature variations and trends from global reanalyses and monthly surface climatological datasets» «Deducing Multidecadal Anthropogenic Global Warming Trends Using Multiple Regression Analysis» «Early onset of industrial - era warming across the oceans and continentsWarming Trends Using Multiple Regression Analysis» «Early onset of industrial - era warming across the oceans and continentswarming across the oceans and continents»

«We evaluate to what extent the temperature rise in the past 100 years was a trend or a natural fluctuation and analyze 2249 worldwide monthly temperature records from GISS (NASA) with the 100 - year period covering 1906 - 2005 and the two 50 - year periods from 1906 to 1955 and 1956 to 2005... The data document a strong urban heat island eff ect (UHI) and a warming with increasing station elevation... About a quarter of all the records for the 100 - year period show a fall in temperatures... that the observed temperature records are a combination of long - term correlated records with an additional trend, which is caused for instance by anthropogenic CO2, the UHI or other forcings... As a result, the probabilities that the observed temperature series are natural have values roughly between 40 % and 90 %, depending on the stations characteristics and the periods considered.»

Further, the probabilistic approach reveals a picture startling to even most global - warming pessimists: If we're to avoid precipitating what that U.N. Framework Convention genteelly calls «dangerous anthropogenic interference,» we're going to have to aim at an atmospheric greenhouse - gas concentration target that, by current trends, we'll reach in less than two decades.

Williams et al., 2017 (DOI: 10.1002 / 2017GL073138) «The warming trend post-1850s in the SST reconstruction (0.8 ± 0.16 °C, 1s) is consistent with global mean warming of 0.85 ± 0.21 °C (1s) from 1880 to 2012 (Figure 4b, c), attributed largely to anthropogenic causes -LSB-...].

The near - linear rate of anthropogenic warming (predominantly from anthropogenic greenhouse gases) is shown in sources such as: «Deducing Multidecadal Anthropogenic Global Warming Trends Using Multiple Regression Analysis» «The global warming hiatus — a natural product of interactions of a secular warming trend and a multi-decadal oscillation» «The Origin and Limits of the Near Proportionality between Climate Warming and Cumulative CO2 Emissions» «Sensitivity of climate to cumulative carbon emissions due to compensation of ocean heat and carbon uptake» «Return periods of global climate fluctuations and the pause» «Using data to attribute episodes of warming and cooling in instrumental records» «The proportionality of global warming to cumulative carbon emissions» «The sensitivity of the proportionality between temperature change and cumulative CO2 emissions to ocean anthropogenic warming (predominantly from anthropogenic greenhouse gases) is shown in sources such as: «Deducing Multidecadal Anthropogenic Global Warming Trends Using Multiple Regression Analysis» «The global warming hiatus — a natural product of interactions of a secular warming trend and a multi-decadal oscillation» «The Origin and Limits of the Near Proportionality between Climate Warming and Cumulative CO2 Emissions» «Sensitivity of climate to cumulative carbon emissions due to compensation of ocean heat and carbon uptake» «Return periods of global climate fluctuations and the pause» «Using data to attribute episodes of warming and cooling in instrumental records» «The proportionality of global warming to cumulative carbon emissions» «The sensitivity of the proportionality between temperature change and cumulative CO2 emissions to ocean mixingwarming (predominantly from anthropogenic greenhouse gases) is shown in sources such as: «Deducing Multidecadal Anthropogenic Global Warming Trends Using Multiple Regression Analysis» «The global warming hiatus — a natural product of interactions of a secular warming trend and a multi-decadal oscillation» «The Origin and Limits of the Near Proportionality between Climate Warming and Cumulative CO2 Emissions» «Sensitivity of climate to cumulative carbon emissions due to compensation of ocean heat and carbon uptake» «Return periods of global climate fluctuations and the pause» «Using data to attribute episodes of warming and cooling in instrumental records» «The proportionality of global warming to cumulative carbon emissions» «The sensitivity of the proportionality between temperature change and cumulative CO2 emissions to ocean anthropogenic greenhouse gases) is shown in sources such as: «Deducing Multidecadal Anthropogenic Global Warming Trends Using Multiple Regression Analysis» «The global warming hiatus — a natural product of interactions of a secular warming trend and a multi-decadal oscillation» «The Origin and Limits of the Near Proportionality between Climate Warming and Cumulative CO2 Emissions» «Sensitivity of climate to cumulative carbon emissions due to compensation of ocean heat and carbon uptake» «Return periods of global climate fluctuations and the pause» «Using data to attribute episodes of warming and cooling in instrumental records» «The proportionality of global warming to cumulative carbon emissions» «The sensitivity of the proportionality between temperature change and cumulative CO2 emissions to ocean Anthropogenic Global Warming Trends Using Multiple Regression Analysis» «The global warming hiatus — a natural product of interactions of a secular warming trend and a multi-decadal oscillation» «The Origin and Limits of the Near Proportionality between Climate Warming and Cumulative CO2 Emissions» «Sensitivity of climate to cumulative carbon emissions due to compensation of ocean heat and carbon uptake» «Return periods of global climate fluctuations and the pause» «Using data to attribute episodes of warming and cooling in instrumental records» «The proportionality of global warming to cumulative carbon emissions» «The sensitivity of the proportionality between temperature change and cumulative CO2 emissions to ocean mixingWarming Trends Using Multiple Regression Analysis» «The global warming hiatus — a natural product of interactions of a secular warming trend and a multi-decadal oscillation» «The Origin and Limits of the Near Proportionality between Climate Warming and Cumulative CO2 Emissions» «Sensitivity of climate to cumulative carbon emissions due to compensation of ocean heat and carbon uptake» «Return periods of global climate fluctuations and the pause» «Using data to attribute episodes of warming and cooling in instrumental records» «The proportionality of global warming to cumulative carbon emissions» «The sensitivity of the proportionality between temperature change and cumulative CO2 emissions to ocean mixingwarming hiatus — a natural product of interactions of a secular warming trend and a multi-decadal oscillation» «The Origin and Limits of the Near Proportionality between Climate Warming and Cumulative CO2 Emissions» «Sensitivity of climate to cumulative carbon emissions due to compensation of ocean heat and carbon uptake» «Return periods of global climate fluctuations and the pause» «Using data to attribute episodes of warming and cooling in instrumental records» «The proportionality of global warming to cumulative carbon emissions» «The sensitivity of the proportionality between temperature change and cumulative CO2 emissions to ocean mixingwarming trend and a multi-decadal oscillation» «The Origin and Limits of the Near Proportionality between Climate Warming and Cumulative CO2 Emissions» «Sensitivity of climate to cumulative carbon emissions due to compensation of ocean heat and carbon uptake» «Return periods of global climate fluctuations and the pause» «Using data to attribute episodes of warming and cooling in instrumental records» «The proportionality of global warming to cumulative carbon emissions» «The sensitivity of the proportionality between temperature change and cumulative CO2 emissions to ocean mixingWarming and Cumulative CO2 Emissions» «Sensitivity of climate to cumulative carbon emissions due to compensation of ocean heat and carbon uptake» «Return periods of global climate fluctuations and the pause» «Using data to attribute episodes of warming and cooling in instrumental records» «The proportionality of global warming to cumulative carbon emissions» «The sensitivity of the proportionality between temperature change and cumulative CO2 emissions to ocean mixingwarming and cooling in instrumental records» «The proportionality of global warming to cumulative carbon emissions» «The sensitivity of the proportionality between temperature change and cumulative CO2 emissions to ocean mixingwarming to cumulative carbon emissions» «The sensitivity of the proportionality between temperature change and cumulative CO2 emissions to ocean mixing»

The grand mistake of the climate catastrophists was using an instrument network primarily located in industrialized NH locations and mistaking a natural warming trend beginning in the 1970 - 1980 timeframe with anthropogenic warming.

Anthropogenic global warming (AGW), a recent warming of the Earth's lower atmosphere as evidenced by the global mean temperature anomaly trend [9], is believed to be the result of an «enhanced greenhouse effect» mainly due to human - produced increased concentrations of greenhouse gases in the atmosphere [10] and changes in the use of land [11]..

Using data to attribute episodes of warming and cooling in instrumental records, Ka - Kit Tung1 and Jiansong Zhou, 12/2012; ``... anthropogenic global warming trends might have been overestimated by a factor of two in the second half of the 20th century.»

It's this final phrase, «superimposed on an anthropogenic warming trend», that Swanson and Tsonis explore further in a subsequent research.

In 2009, they continue to examine the coupling of ocean cycles, stressing «caution that the shifts described here are presumably superimposed upon a long term warming trend due to anthropogenic forcing» (Swanson & Tsonis 2009).

The distinct lack of any warming has compromised greatly the ability of climate models to accurately predict short and long - term climate trends, and in my opinion goes a long way toward the «critical failure» that falsifies the very hypothesis and foundation of the anthropogenic global warming theory.

I do think, however, that it is significant (short term, not a firm trend) that CO2, as measured at MLO, has been increasing at a smaller rate than in previous years despite the fact that overall anthropogenic CO2 output is not decreasing and, furthermore, that the short term trend of the absolute increase is also down which indicates a greater rate of absorption of CO2 than in previous years — which to me would indicate an ongoing cooling of the oceans as per the theory that a cooling ocean absorbs more CO2 while a warming ocean releases more CO2.

The point they make may be summarized by the following quote: «While in the observations such breaks in temperature trend are clearly superimposed upon a century time - scale warming presumably due to anthropogenic forcing, those breaks result in significant departures from that warming over time periods spanning multiple decades.»

However, comparison of the 2035 event in the 21st century simulation and the 1910s event in the observations with this event, suggests an alternative hypothesis, namely that the climate shifted after the 1970s event to a different state of a warmer climate, which may be superimposed on an anthropogenic warming trend.

Johnson et al. (2007) estimated that the deep ocean could add an additional 2 - 10 % to the upper ocean heat content trend, which is likely to grow in importance as the anthropogenic warming signal propagates to increasing depth with time.

The Early Anthropogenic Hypothesis (108) posits that mid-Holocene increases in CO2 and CH4 resulted from early land clearing and other agricultural practices and that these unprecedented interglacial trends in atmospheric composition set global climate on a trajectory toward warmer conditions long before human use of fossil fuels (108, 109).

I would interpret this as a sequence of step functions followed by multiyear declines (when El Nino leftover warm water pools slowly lose their heat), superseeded by a warming trend, caused by other natural and anthropogenic causes, which in sum just keep the temperature about constant after the step function.

Indeed, our results show that even in the absence of trends in mean precipitation — or trends in the occurrence of extremely low - precipitation events — the risk of severe drought in California has already increased due to extremely warm conditions induced by anthropogenic global warming.

«The land — sea warming ratio in the ECHAM — HadISST holds also for the warming trend over the most recent decades, despite the fact that no anthropogenic radiative forcings are included in the simulations.

e.g., the «very high confidence» in major anthropogenic warming is an «argument from ignorance» due to underestimating the trends and major uncertainties regarding TSI, solar influence, and cloud trends.

The empirical curve forecast (black curve made of the harmonic component plus the proposed corrected anthropogenic warming trend) looks in good agreement with the data up to now.

This warming is then extended in the IPCC GCMs» projections for the 21st century with an anthropogenic warming trend of about 2.3 °C / century, as evident in the IPCC's figure SPM5 shown below

In fact, it is not possible to directly solving the natural versus the anthropogenic component of the upward warming trend observed in the climate since 1850 (about 0.8 °C) by using the harmonic model calibrated on the same data because with 161 years of data at most a 60 - year cycle can be well detected, but not longer cycleIn fact, it is not possible to directly solving the natural versus the anthropogenic component of the upward warming trend observed in the climate since 1850 (about 0.8 °C) by using the harmonic model calibrated on the same data because with 161 years of data at most a 60 - year cycle can be well detected, but not longer cyclein the climate since 1850 (about 0.8 °C) by using the harmonic model calibrated on the same data because with 161 years of data at most a 60 - year cycle can be well detected, but not longer cycles.

* «UK rainfall shows large year to year variability, making trends hard to detect» * «While connections can be made between climate change and dry seasons in some parts of the world, there is currently no clear evidence of such a link to recent dry periods in the UK» * «The attribution of these changes to anthropogenic global warming requires climate models of sufficient resolution to capture storms and their associated rainfall.»

The removal of the AMO in the determination of the anthropogenic warming trend is justified if one accepts our previous argument that this multidecadal variability is mostly natural.