Sentences with phrase «observed over the last century»

«This underscores that large, sustained changes in global temperature like those observed over the last century require drivers such as increased greenhouse gas concentrations,» said lead author Patrick Brown, a PhD student at Duke's Nicholas School of the Environment.

If the same conditions that caused the storm had occurred in a world without the warming observed over the last century, it would not have been as severe.

This pattern of warmer below, colder above is just what we've observed over the last century as the concentration of carbon dioxide in the atmosphere has increased.

For the station nearest my home, the range (max less min) in annual average temperature for the past century is just 3.3 C. Can't say whether 1C warming matters in any tangible way, at this particular spot, but it's certainly large compared to the variation observed over the last century.

Human activities that release carbon dioxide and other greenhouse gases into the atmosphere are largely responsible for the climate change observed over the last century.

Since 1992, the rate of global sea level rise measured by satellites has been roughly twice the rate observed over the last century, providing evidence of acceleration.

In contrast to the above, it is entirely possible that much, perhaps most, of the climate change observed over the last century or so is natural.

Not exact matches

The changes in these regions can account for about 90 percent of the observed variation in the river's streamflow over the last century, with one to four months lead - time.

The team also compared the ice loss up until the mid-1980s to that observed by satellites over roughly the last decade and found that today the rate of ice loss is twice the 20th century average, mostly because of increased water runoff from the ice sheet's surface.

Third, using a «semi-empirical» statistical model calibrated to the relationship between temperature and global sea - level change over the last 2000 years, we find that, in alternative histories in which the 20th century did not exceed the average temperature over 500-1800 CE, global sea - level rise in the 20th century would (with > 95 % probability) have been less than 51 % of its observed value.

Knutti et al. (2002) also determine that strongly negative aerosol forcing, as has been suggested by several observational studies (Anderson et al., 2003), is incompatible with the observed warming trend over the last century (Section 9.2.1.2 and Table 9.1).

Reducing the heat lost to the atmosphere allows the oceans to steadily warm over time - as has been observed over the last half century.

During this period, the team of Arad and Feige could observe and offer notes on various Marvel - licensed films, such as Elektra, X-Men: The Last Stand, Spider - Man 3, and Fantastic Four: Rise of the Silver Surfer, but, ultimately, had no control over those films made by 20th Century Fox, Columbia Pictures, and other studios.

France's «Of Gods and Men,» the grand prize winner at last year's Cannes Festival, offers up just such a message in a finely wrought, quietly observed ensemble piece starring Lambert Wilson and the 79 - year - old Michael Lonsdale, whose jowly, hangdog countenance has graced over half a century of great cinema.

Since the CMIP5 models used by the IPCC on average adequately reproduce observed global warming in the last two and a half decades of the 20th century without any contribution from multidecadal ocean variability, it follows that those models (whose mean TCR is slightly over 1.8 °C) must be substantially too sensitive.

The sun itself is observed over the last several decades as hotter than it was earlier in the last century.

It presents a significant reinterpretation of the region's recent climate change origins, showing that atmospheric conditions have changed substantially over the last century, that these changes are not likely related to historical anthropogenic and natural radiative forcing, and that dynamical mechanisms of interannual and multidecadal temperature variability can also apply to observed century - long trends.

I posted a quick riff overnight on new research, published in Nature, that links human - driven global warming and rising instances of extreme precipitation in observed parts of the Northern Hemisphere over the last half of the 20th century.

These analyses indicate that it is likely that greenhouse gases alone would have caused more than the observed warming over the last 50 years of the 20th century, with some warming offset by cooling from natural and other anthropogenic factors, notably aerosols, which have a very short residence time in the atmosphere relative to that of well - mixed greenhouse gases (Schwartz, 1993).

For the entire Northern Hemisphere, there is evidence of an increase in both storm frequency and intensity during the cold season since 1950,1 with storm tracks having shifted slightly towards the poles.2, 3 Extremely heavy snowstorms increased in number during the last century in northern and eastern parts of the United States, but have been less frequent since 2000.11,15 Total seasonal snowfall has generally decreased in southern and some western areas, 16 increased in the northern Great Plains and Great Lakes region, 16,17 and not changed in other areas, such as the Sierra Nevada, although snow is melting earlier in the year and more precipitation is falling as rain versus snow.18 Very snowy winters have generally been decreasing in frequency in most regions over the last 10 to 20 years, although the Northeast has been seeing a normal number of such winters.19 Heavier - than - normal snowfalls recently observed in the Midwest and Northeast U.S. in some years, with little snow in other years, are consistent with indications of increased blocking (a large scale pressure pattern with little or no movement) of the wintertime circulation of the Northern Hemisphere.5 However, conclusions about trends in blocking have been found to depend on the method of analysis, 6 so the assessment and attribution of trends in blocking remains an active research area.

«Methane migration through the 1 - to 2 - km - thick geological formations that overlie the Marcellus and Utica shales is less likely as a mechanism for methane contamination than leaky well casings, but might be possible due to both the extensive fracture systems reported for these formations and the many older, uncased wells drilled and abandoned over the last century and a half in Pennsylvania and New York [where they did their study]... More research is needed across this and other regions to determine the mechanism (s) controlling the higher methane concentrations we observed.»

That is that the range of estimated temperatures for the earth over, say, the last 100,000 years, greatly dominates both the observed changes supposedly caused by CO2 over the last 150 years and the changes projected by the CAGW believers by the end of this century.

«It is very likely that the rate of global mean sea level rise during the 21st century will exceed the rate observed during 1971 — 2010 for all RCP scenarios... with a rate of rise 8 — 15 mm yr — 1 over the last decade of the 21st century) for RCP8.5.»

A number of recent studies have found changes in the interannual variability of ENSO over the last century, related in part to an observed reduction in ENSO variability between about 1920 and 1960.

Climate models have proven remarkably accurate when it comes to reproducing the long - term warming we've observed over the last half century, and were never expected to reproduce the exact timing of natural events.

The observed recession of glaciers (Box 1.1) during the last century is larger than at any time over at least the last 5,000 years, is outside of the range of normal climate variability, and is probably induced by anthropogenic warming (Jansen et al., 2007).

Every model has a different sensitivity and they all claim to «match» the observed surface temperature changes over the last century.

On the question of whether observed changes in climate can be attributed to human activities such as burning fossil fuels, Bolin noted that «The global mean temperature has increased by 0.3 - 0.6 degrees C since the late 19th century, and about 0.3 degrees over the last 40 years.»

But there is very little research specifically on near term dec - cen variability, especially in relation to observed climate change over the last century or so.

According to the Intergovernmental Panel on Climate Change, the observed variation in storm activity and drought shows «no significant trends evident over the last century» (2).

Under Watson's tenure, the IPCC last year produced its third comprehensive assessment of the state of climate science, concluding that» [t] here is new and stronger evidence that most of the warming observed over the last 50 years is attributable to human activities,» and predicting that average global temperatures will rise between 3 and 10 degrees Fahrenheit by the endof the century — conclusions reaffirmed last spring at White House request by the National Academy of Sciences.

For the last 50 years, global temperature rose at an average rate of about 0.13 °C (around one - quarter degree Fahrenheit) per decade - almost twice as fast as the 0.07 °C per decade increase observed over the previous half - century.

Of course at its base your premise is wrong — the majority of observed sea level rise over the last century has been a function of thermal expansion, which even you would probably concede is a physical phenomenon that is well understood and easily modelled.

While there are areas, such as the extra-tropical Pacific and North Atlantic Ocean, where the GFDL model warms significantly more than has been observed, the anthropogenic climate change simulations do provide a plausible explanation of temperature trends over the last century over large areas of the globe.