Sentences with phrase «warming of the climate system caused»

While it is generally accepted that the observed reduction of the Northern Hemisphere spring snow cover extent (SCE) is linked to warming of the climate system caused by human induced greenhouse gas emissions, it has been difficult to robustly quantify the anthropogenic contribution to the observed change.

Not exact matches

Finney believes that changes in climate cause the cycles in salmon populations, and as scientists struggle to understand the rate and effects of global warming, salmon may help them distinguish normal climate variations from the early warnings of a system gone dangerously wrong.

Using 19 climate models, a team of researchers led by Professor Minghua Zhang of the School of Marine and Atmospheric Sciences at Stony Brook University, discovered persistent dry and warm biases of simulated climate over the region of the Southern Great Plain in the central U.S. that was caused by poor modeling of atmospheric convective systems — the vertical transport of heat and moisture in the atmosphere.

Continued emissions of greenhouse gases will cause further warming and long - lasting changes in all components of the climate system, increasing the likelihood of widespread and profound impacts affecting all levels of society and the natural world, the report finds.

Given those findings and the rest of the improved understanding of the climate system, the IPCC projects that if carbon dioxide gas emissions — the primary cause of warming — continue to grow at the recent rate, the world would warm 2oC above 19th - century levels by the middle of this century.

«The reason for the layering is that global warming in parts of Antarctica is causing land - based ice to melt, adding massive amounts of freshwater to the ocean surface,» said ARC Centre of Excellence for Climate System Science researcher Prof Matthew England an author of the paper.

The vast majority of climate researchers are convinced by the data that human - caused warming is underway, though spirited debate surrounds the complex feedbacks in the climate system.

[11] Few attribute the decline in fog, and moreover, climate change, to the Pacific Decadal Oscillation, however, as the Pacific Decadal Oscillation is an oscillation moving heat through the climate system but neither creating nor retaining heat, it is not a cause of warming trends or declines in fog.

If we listen to what Earth system scientists, including climate scientists, are telling us, the warming of the Earth due to human causes is a slowly unfolding catastrophe.

Continued emissions of greenhouse gases will cause further warming and changes in all components of the climate system.

The elements that I believe are key to a successful agreement in Copenhagen include: • Strong targets and timetables from industrialized countries and differentiated but binding commitments from developing countries that put the entire world under a system with one commitment: to reduce emissions of carbon dioxide and other global warming pollutants that cause the climate crisis; • The inclusion of deforestation, which alone accounts for twenty percent of the emissions that cause global warming; • The addition of sinks including those from soils, principally from farmlands and grazing lands with appropriate methodologies and accounting.

Gavin, I agree completely with the standard picture that you describe, but I don't agree with the claim that ``... as surface temperatures and the ocean heat content are rising together, it almost certainly rules out intrinsic variability of the climate system as a major cause for the recent warming».

«Firstly, as surface temperatures and the ocean heat content are rising together, it almost certainly rules out intrinsic variability of the climate system as a major cause for the recent warming»

The first paper adds to the literature pointing to humans as the dominant cause of warming since 1950, but also finds that the sensitivity of the climate system to the greenhouse - gas buildup could be lower than some other recent studies found.

For a long time there's been a strong perception among those of us tracking research on human - caused global warming that meteorologists are more apt to doubt that humans could dangerously disrupt climate than the much smaller community of climatologists studying the overall climate system and what influences its patterns.

Subsidary question: as the ocean is quite a big part of the climate system, are it's temperature variations sufficiently constraint to corroborate the very interesting conclusion of Gavin's note: «It's interesting to note that significant solar forcing would have exactly the opposite effect (it would cause a warming)-- yet another reason to doubt that solar forcing is a significant factor in recent decades.»

... we strongly support Delworth and Knutson's (2000) contention that this high - latitude warming event represents primarily natural variability within the climate system, rather than being caused primarily by external forcings, whether solar forcing alone (Thejll and Lassen, 2000) or a combination of increasing solar irradiance, increasing anthropogenic trace gases, and decreasing volcanic aerosols.

Some researchers have speculated that this is due to the effects of global warming causing a new «resonance» in the climate system.

The IPCC concluded that «the effects [of greenhouse gases], together with those of other anthropogenic drivers, have been detected throughout the climate system and are extremely likely to have been the dominant cause of the observed warming since the mid-20th century.»

As these particular events took place at the end of a local warm period caused by orbital forcing (see Box 6.1 and Section 6.5.1), these observations suggest that under gradual climate forcings (e.g., orbital) the climate system can change abruptly.

Part of problem is that even with current levels of emissions, the inertia of the climate system means that not all of the warming those emissions will cause has happened yet — a certain amount is «in the pipeline» and will only rear its head in the future, because the ocean absorbs some of the heat, delaying the inherent atmospheric warming for decades to centuries.

Final Text: The headline message to the section states that continued GHG emissions will cause further warming and changes in all components of the climate system, and that limiting climate change will require substantial and sustained reductions of GHG emissions.

One next needs to integrate the finding into a more complete climate change description which follows the observations from beginning to end as they alternately cause warming or cooling of the climate system around the basic level of energy content determined by mass, gravity and ToA insolation.

Assuming a good bit of this was added after the natural warming cycle was started we are probably looking at closer to 1200 ppm over the next century or two before C02 levels begin to decrease again as this natural green house locks up carbon primarily in phytoplankton blooms caused by fertilization from the new large desert regions near the equator and excessive erosion from very intense storm systems the develop in such a hot house climate.

In recent decades, much research on these topics has raised the questions of «tipping points» and «system flips,» where feedbacks in the system compound to rapidly cause massive reorganization of global climate over very short periods of time — a truncation or reorganization of the thermohaline circulation or of food web structures, for instance, caused by the loss of sea ice or warming ocean temperatures.

Given that «causes of the earlier warming are less clear ``, our understanding of Earth's climate system is rudimentary at best, and our historical record is laughably brief, it is confounding how the IPCC can be so «extremely» sure «that human influence has been the dominant cause of the observed warming since the mid-20th century», which is «not statistically significantly different» from the natural warming that occurred between 1910 — 1940.

The simultaneous increase in energy content of all the major components of the climate system and the pattern and amplitude of warming in the different components, together with evidence that the second half of the 20th century was likely the warmest in 1.3 kyr indicate that the cause of the warming is extremely unlikely to be the result of internal processes alone.

The widespread change detected in temperature observations of the surface, free atmosphere and ocean, together with consistent evidence of change in other parts of the climate system, strengthens the conclusion that greenhouse gas forcing is the dominant cause of warming during the past several decades.

As I hope you understand, IF we assume those things, then an «unnatural» small forcing of man - made carbon dioxide MIGHT cause a warming, but only if the climate system is in an unstable equilibrium.

And the climate system is not helping the cause with ever more desperate post hoc rationalisations for the lack of warming.

The IPCC reported that «warming of the climate system is unequivocal» and that «changes in climate have caused impacts on natural and human systems on all continents and across the oceans.»

AMO / PDO on the other hand are system states that last 20 - 40 years, and there's very good reasons to think that they are the cause of the entire modern warming, these should be modeled by GCM's, but they don't do this either, and they have a far bigger effect on «climate» while the smaller scale chaotic artifacts have no effect on «climate».

Even with ongoing questions about the proxy data, the IPCC's key statement — that most of the warming since the mid-twentieth century is «very likely» to be due to human - caused increases in greenhouse - gas concentration — remains solid because it rests on multiple lines of evidence from different teams examining many aspects of the climate system, says Susan Solomon, the former co-chair of the IPCC team that produced the 2007 physical science report and a climate researcher with the US National Oceanic and Atmospheric Administration in Boulder, Colorado.

This year's late winter heat wave over much of the United States, dubbed «March Madness,» has been cited as evidence that human - induced global warming is causing the climate system to stray far outside its normal range of variability.

Likening today's climate system to a muscle - bound, drugged athlete performing feats far beyond the capabilities of straight athletes would be appropriate if the extreme and persistent distortions of the jet stream we saw in March could be demonstrated to have been caused by global warming.

«The assessment is supported additionally by a complementary analysis in which the parameters of an Earth System Model of Intermediate Complexity (EMIC) were constrained using observations of near - surface temperature and ocean heat content, as well as prior information on the magnitudes of forcings, and which concluded that GHGs have caused 0.6 °C to 1.1 °C (5 to 95 % uncertainty) warming since the mid-20th century (Huber and Knutti, 2011); an analysis by Wigley and Santer (2013), who used an energy balance model and RF and climate sensitivity estimates from AR4, and they concluded that there was about a 93 % chance that GHGs caused a warming greater than observed over the 1950 — 2005 period; and earlier detection and attribution studies assessed in the AR4 (Hegerl et al., 2007b).»

The issue for us is whether man is causing a catastrophe (mainly due to large positive feedbacks in the climate system), and whether past warming has been consistent with catastrophic rates of man - made warming.

[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.

Given the huge climate change in the NH, the net effect is trivial and fully supports the contention that minor changes in OHT do not cause long term synchronous * global * warming or cooling because they are just * reorganisations * of the way energy moves around * inside * the climate system.

http://www.ipcc.ch/pdf/assessment-report/ar4/wg1/ar4-wg1-chapter9.pdf The widespread change detected in temperature observations of the surface (Sections 9.4.1, 9.4.2, 9.4.3), free atmosphere (Section 9.4.4) and ocean (Section 9.5.1), together with consistent evidence of change in other parts of the climate system (Section 9.5), strengthens the conclusion that greenhouse gas forcing is the dominant cause of warming during the past several decades.

But the lack of statistically significant results and, more important, the absence of evidence pointing to a smoking gun — a physical mechanism in the climate system that ties Arctic changes to extreme events — has left many top climate researchers unconvinced that rapid Arctic warming is a major player in causing extreme weather events outside of the Arctic itself.

In other words will the small amount of warming cause the powerful GHGs (like water vapour) to increase the amount warmed or is the climate system stable such that there are feedback mechanisms which works to dampen and / maintain the climate in a «steady state».

According to the Intergovernmental Panel on Climate Change, a Nobel Prize - winning scientific body tasked by the United Nations with assessing the risk of human - caused climate change, «An increasing body of observations gives a collective picture of a warming world and other changes in the climate sysClimate Change, a Nobel Prize - winning scientific body tasked by the United Nations with assessing the risk of human - caused climate change, «An increasing body of observations gives a collective picture of a warming world and other changes in the climate sysclimate change, «An increasing body of observations gives a collective picture of a warming world and other changes in the climate sysclimate system....

However, the climate system is not linear, and if there are significant negative feedbacks to increased radiative forcing, then a significant portion of the recent warming could've been caused by natural variability if the corresponding variability went up with temperature.

What may be happening is that the changing climate is affecting the pattern of the jet stream, causing warmer high - pressure systems to sit and stay in one place in what's called a blocking pattern.

The scientific consensus is that greenhouse gas (GHG) emissions from human agricultural and industrial activity are the principal cause of this global warming [1]--[3] and that such emissions must be severely curtailed to prevent further anthropogenic disruption of the climate system [4].