Sentences with phrase «natural warm phase»

The scientists chose the period of time known as the «Holocene» for their research, because it is the most recent natural warm phase in Earth's history.

Not exact matches

The North Atlantic Oscillation, a large - scale natural weather cycle, went into a phase in which summer atmospheric conditions favored more incoming solar radiation and warmer, moist air from the south.

In the end, natural gas will always be a fossil fuel that would need to be phased out (or its global warming pollution captured and stored) in the next few decades to avoid even worse climate change.

This NASA analysis highlights that the recent lull in surface temperatures is simply the result of natural variability superimposed upon the global warming trend - the cool phase of a cool / warm oscillation.

The report warns that natural gas will have to be phased out along with coal, if the world is to limit warming to 1.5 ˚C, as spelt out in the Paris Agreement long term temperature goal.

«The Earth goes through phases of warming and cooling, and though all the computer models we have show that we are in a warming phase, there is no way to differentiate between a natural warming and one that is human - caused.»

If you are trying to attribute warming over a short period, e.g. since 1980, detection requires that you explicitly consider the phasing of multidecadal natural internal variability during that period (e.g. AMO, PDO), not just the spectra over a long time period.

The model simulation quite clearly indicates that any natural «AMO» surface warming of the tropical Atlantic should be in phase with a strengthening, not a weakening, of the THC.

So, the Alaska climate site statement referring to the 1977 PDO shift as «natural» is misleading in the extreme in that the effect of global warming on the PDO warm phase would be with regard to its persistence and possibly its timing.

There is also no reason to expect less warming in the future — in fact, perhaps rather the opposite as the climate system will catch up again due its natural oscillations, e.g. when the Pacific decadal oscillation swings back to its warm phase.

One of the most politically charged allegations is that Jones, together with scientific collaborators, tried to systematically downplay the importance of the Medieval Warm Period (MWP), a brief phase of natural, pre-industrial warming that may have occurred around 1000 AD.

There is absolutely nothing to suggest that carbon dioxide is a climate driver beyond a spurious correlation with temperature in Antarctic ice cores where blinkered climate scientists talked up the supposed CO2 - amplified warming phase but then just ignored the cooling phase that told them CO2 was obviously dominated by natural forces.

While the tropical Atlantic is currently warmer than average, the far North Atlantic is colder than average, potentially indicative of a negative phase of an Atlantic multi-decadal oscillation, another entirely natural occurrence which affects ocean temperatures over 25 to 40 years.

In 1975 Wallace Broeker (the guy who first used the phrase «global warming», predicted a rapid transition to warming in the 1980s, caused by a combination of rapidly rising CO2 emissions and a natural temperature cycle (derived from work on Greenland ice cores at Camp Century) which showed a rapid warming phase up to 1940, followed by the cooling phase which was attenuated by CO2.

His contention is that this is due to a natural multi-decadal oceanic oscillation that is in its warming phase, superposed on a natural 200 - year warming trend - rebound since the end of the Little Ice Age.

«The global warming in 1970 - 1998 was merely a phase in the 60 - year cycles of natural warming and cooling,» Dr. Bashkirtsev says.

Scientists studying oceans demonstrate that the recent warming, to the end of the last century, is part of the natural cycle of oceanic oscillations and predict a thirty year cooling phase.

Although it can not be discounted that long - term warming is affecting this circulation in some way, a large part of this recent behavior is likely to be natural variation associated with the vigorous or sluggish phases of the ocean circulation.

Various explanations have been offered for why the positive phase has been predominant, including natural variability and greenhouse warming.

In short, Swanson and Tsonis hypothesized that when various natural oceanic cycles (PDO, AMO, etc.) synchronize (i.e. in their positive or negative phases), they can cause a short - term warming or cooling which could be described as a «climate regime shift.»

Also, the above chart of the 12 - month means clearly shows a climate that moves from cooling to warming phases, and then back - a natural oscillation that «catastrophic global warming» skeptics have long discussed, while being dismissed by the IPCC and its cohorts.

Furthermore most of the papers in their compilation only studied responses during the warm phases of natural ocean cycles beginning in the 70s, after most marine organisms had retreated south.

The reality of the climate record is that a sudden natural cooling is far more to be feared, and will do infinitely more social and economic damage, than the late 20th century phase of gentle warming.

«A reduction in the rate of warming (not a pause) is a result of short - term natural variability, ocean absorption of heat from the atmosphere, volcanic eruptions, a downward phase of the 11 - year solar cycle, and other impacts over a short time period,» Cleugh says.

If that is the cooling phase of a natural cycle, and that cycle was in a warming phase during the late 20th century, then about half the late 20th C warming was natural, and half due to AGW.

Bart says: June 8, 2010 at 11:20 am What he has shown is that the phasing of these natural cycles is such that they constructively interfere in recent times to produce at least a substantial portion of our current warming cycle.

What he has shown is that the phasing of these natural cycles is such that they constructively interfere in recent times to produce at least a substantial portion of our current warming cycle.

Broecker also put the 1910 - 1940 warm phase in the context of 80 - and 180 - year natural variability cycles that are typical of what had been happening over the past 800 years according to Greenland records.

He later added: What he has shown is that the phasing of these natural cycles is such that they constructively interfere in recent times to produce at least a substantial portion of our current warming cycle.

One more time: Spencer has shown that, when you account for the phasing of the various natural indices, they interfere constructively in a way which accounts for at least a significant portion of the recent warming.

«About 60 % of the warming observed from 1970 to 2000 was very likely caused by the above natural 60 - year climatic cycle during its warming phase.»

The Montreal Protocol has a lot more to offer than a model for addressing global warming emissions, it is itself an important tool that urgently needs to be strengthened to harvest the «low hanging fruit» of phasing out hydrofluorocarbons (and HCFCs), the high global warming potential ODS alternatives with genuinely climate friendly natural refrigerant solutions.

To meet the Paris Agreement's goal to keep global warming «well below» 2 °C, the world must phase down the production of coal, oil and natural gas.

[Rob P]- The warming from 1910 - 1940, a time of weak anthropogenic (human - caused) forcing, matches the warm (positive) phase of the Interdecadal Pacific Oscillation (IPO)- the largest natural multidecadal oscillation in the climate system.

On that basis I think we will see cooling for a couple of decades due to the negative phase of the Pacific Decadal Oscillation which has just begun then at least one more 20 to 30 year phase of natural warming before we start the true decline as the cooler thermohaline waters from the Little Ice Age come back to the surface.

Wu et al. (7, 8) pointed out the importance of this mode in the modern global temperature record with a period of 65 y: If it is interpreted as natural and related to the Atlantic Multidecadal Oscillation (AMO)(9 ⇓ ⇓ — 12), then the trend attributed to anthropogenic warming should be significantly reduced after ∼ 1980, when the AMO was in a rising phase.

Because observations and coupled model simulations do not have the same phasing of natural internal variability, such decadal differences in simulated and observed warming rates invariably occur.

When the phase of natural variability is taken into account, the model 15 - year warming trends in CMIP5 projections well estimate the observed trends for all 15 - year periods over the past half - century.