Sentences with phrase «warming episodes»

It raised the obvious problem that if tree rings were not detecting the modern warming trend, they might also have missed comparable warming episodes in the past.

Global climate is a good example — not today's global warming episode, but long - term climate changes on the scale of many millions of years.

In the current warming episode, it is clear that CO2 and other human - induced heat - trapping gases are driving the warming.

Temperature extremes over these years is basically in line with what is expected under global warming - an increase in extremely warm episodes and a decline in extremely cold ones.

The ice most recently rolled over the lake sometime between 120,000 and a million years ago, depending on which of several warming episodes the ice sheet did or didn't withstand.

But the time period for your graph includes the 1940 to 1970 period of slight cooling between warming episodes before and after it.

In the current warming episode, it is clear that CO2 and other human - induced heat - trapping gases are driving the warming.

Release of hydrates below retreating ice sheets could therefore act as a hitherto neglected positive feedback during warming episodes.

An undersea methane explosion may have driven the most rapid warming episode of the past 90 million years

# 92 Spencer el al 2007 paper doesn't really support the precise mechanism proposed by Lindzen for Iris effect, but more simply observes a strong TOA negative correction associated with warming events at 20 ° S - 20 ° N (that is: in the 2000 - 2005 period of observation, the most significative warming episodes of the surface + low troposphere — 40 days or more — leads to a negative SW+LW cloud forcing at the top of the atmosphere).

The new study is part of a major drilling project to understand the 56 - milion - year - old warming episode, which Bowen says first was discovered in 1991.

Both events were accompanied by warming episodes the U-M-led team found by analyzing the chemical composition of fossil shells using a recently developed technique called the carbonate clumped isotope paleothermometer.

Because of the stratospheric warming episodes following major volcanic eruptions, the trends are far from being linear.

With a global warming of 5º or 6ºC, it is the strongest warming episode to affect the planet in the time since the end - Cretaceous 66 million years ago (when the dinosaurs went extinct).

iii) The failure of outgoing longwave radiation (OLR) to show that there was any increased atmospheric blocking of outgoing radiation following short term troposphere warming episodes.

Looking at this, why do you say the earlier warming episode started in 1915?

ABC: A new study adds to evidence that future warming will produce lower average rainfall around the world, even though Earth's past warming episodes led to more precipitation.

It is thought that some hunters arrived in Alaska about 15,000 years ago during that abrupt warming episode known as the Bølling - Allerød, where the Northern Hemisphere suddenly warmed up to almost modern levels (and in only a few decades, too).

Another popular contrarian argument is that the «climate has changed before», which entails a commitment to high climate sensitivity: if climate sensitivity were as low as contrarians like to claim (≈ 1.5 ◦ C), then the minute past variation in intensity of the sun, which drove past climate changes in the absence of CO2, could not have caused the observed warming episodes.

Kent Moore, a professor of atmospheric physics at the University of Toronto, who published a study in 2016 linking the loss of sea ice to these warm events in the Arctic, said a number of factors may have contributed to the latest warming episode.

On the volcanoes question, they * can * release massive amounts of CO2 — it's thought that ultra-huge volcanic eruptions in the past have been responsible for unleashing warming episodes via CO2 release.

Yet, pre-1960 instrumentally observed temperatures show many warming episodes, similar to the one since 1960, for example, from 1915 to 1950, and from 1850 to 1890.

In the distant past, warming episodes appear to have been initiated by cyclical changes in Earth's orbit around the Sun that caused more... Continue reading →

Both this and the earlier warming episode were preceded by big increases in atmospheric carbon dioxide, similar to what we are seeing today.

In comparison to the large amount of CO2 that was removed from the atmosphere by vegetation during past warm episodes, the rate of CO2 removal by vegetation during the 21st century and beyond will be orders of magnitude smaller.

This led the study to conclude,»... during these last 30 years the solar total irradiance, solar UV irradiance and cosmic ray flux has not shown any significant secular trend, so that at least this most recent warming episode must have another source.»

Those dark brown areas in 5 (b) are 3 standard deviations (3 sigma) or larger (refer figure 3)- very rare extremely warm episodes.

The global existence of the mid-Holocene warm episode, the Medieval Warm Period (MWP), and the Little Ice Age (LIA) is easily proved with proxies from other sources.