Sentences with phrase «century warming signal»

Coincidentally (or not), the marine sediment core that I am currently working on shows a large 20th century warming signal as well.

I have downloaded your combined «Yamalia» data and would agree that they show a 20th century warming signal of about 1C, noting however that a similar magnitude excursion occurred ~ 300 AD.

Not exact matches

To investigate cloud — climate feedbacks in iRAM, the authors ran several global warming scenarios with boundary conditions appropriate for late twenty - first - century conditions (specifically, warming signals based on IPCC AR4 SRES A1B simulations).

The goal is to capture natural variations in the climate, like changes in ocean circulation or features like the El Niño Southern Oscillation, that are swamped by the signal of human - caused warming when looking out to the end of the century.

«This signal of warming emerged above the noise of background variability during the 20th century for most parts of the globe.

Although the global warming signal is relatively weak today in most of the planet (outside of the Arctic), our best science indicates that the warming will greatly increase by the end of the century.»

The point being made is that, without regard for the accuracy or precision of the instrumental record, you can still replicate the 20th - century global warming signal using only a subset of the data.

Isn't «long - term» a relative term, which in this case simply compares the oscillation length of natural fluctuations with the century - long climate record that includes an anthropogenic warming signal?

In a memo to the Vice President s office, Mr. Cooney explained: We plan to begin to refer to this study in Administration communications on the science of global climate change because it contradicts a dogmatic view held by many in the climate science community that the past century was the warmest in the past millennium and signals of human induced global warming.

The question was only: how significant was this warming signal over the 20th century?

McIntyre and McKitrick were able to show that the Hockey Stick chart was based on cherry picked use of data, failed to comply with accepted standards in statistics and signal processing, and ignored compelling evidence for the Medieval Warm Period where historical records demonstrate that it was just as warm, if not warmer, then than the 20th centWarm Period where historical records demonstrate that it was just as warm, if not warmer, then than the 20th centwarm, if not warmer, then than the 20th century.

The signal we are trying to use the USHCN to detect is global warming, which over the last century is currently thought to be about 0.6 C.

In contrast, Crompton et al., 2011 (Open access) suggest that it would probably take several centuries before a man - made global warming signal would become large enough to be detectable.

For instance, Emanuel, 2011 (Abstract; Google Scholar access) suggests that a global warming signal could become statistical significant sometime over the next century or two, and that there could be some indications on time scales as short as 25 years.

When internal variability is filtered from the smoothed observed temperature (solid black line), the cleaned signal (dashed line) shows nearly monotonic warming throughout the 20th Century.

I do agree that there is a modest human impact on climate, mainly clear in the latter half of the twentieth century, and mainly manifested by «mild - ing» or decrease in extremes (little warming in summer, mostly in winter) I'm not convinced that this is a good way to isolate the signal.

I would think that the very first thing one would look to, as a researcher, as to what might be showing a century long trend towards warming would be solar output, if for no other reason to subtract it from the gross trend to isolate any anthropogenic signals.

«Scientists were quick to declare the results of the Turner et al paper, which covered 1 per cent of the Antarctic continent, did not negate a long - term warming because of man - made climate change... «Climate model projections forced with medium emission scenarios indicate the emergence of a large anthropogenic regional warming signal, comparable in magnitude to the late - 20th - century peninsula warming, during the latter part of the current century,» the Turner research concluded.»

So if CO2 increases cause the 20th century global warming then clearly changes in the CO2 concentration should dominate the global temperature signal over that period (CO2 lagged, but not much one suspects, and potentially non-linear)?

Fig. 3 shows that the resulting cleaned signal presents a nearly monotonic warming of the global mean surface temperature throughout the 20th century, and closely resembles a quadratic fit to the actual 20th century global mean temperature.

Removal of that hidden variability from the actual observed global mean surface temperature record delineates the externally forced climate signal, which is monotonic, accelerating warming during the 20th century.

For most purposes, the relevent «signal» we are trying to tease out is the amount of warming we have seen over the last decades or century.