Sentences with phrase «of natural ocean oscillations»

Not exact matches

Looking at shifts in Manley's winter temperatures from year to year, he says, gives a good reading of important natural cycles that influence climate, such as changes in ocean circulation like the North Atlantic Oscillation.

Both real - world observations and the team's simulations reveal that the abnormally strong winds — driven by natural variation in a long - term climate cycle called the Interdecadal Pacific Oscillation — have, for the time being, carried the «missing» heat to intermediate depths of the western Pacific Ocean.

He believes that changes in ocean circulation have warmed the Atlantic and increased hurricane activity in the past decade and that this is simply the result of normal oscillation in natural climate cycles.

The El Niño Southern Oscillation is a natural fluctuation of ocean temperatures in the equatorial Pacific that can give rise to El Niño and La Niña, which drive droughts and floods from South East Asia and Australia to the Americas.

Resource managers and fishery owners can easily access the data needed to identify natural climate oscillations, said Angelicque White, associate professor with the Oregon State College of Earth, Ocean and Atmospheric Sciences.

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.

The first collection of papers establishes that (a) decadal and multi-decadal ocean circulation patterns (AMO, PDO, NAO, ENSO) have significantly modulated precipitation and temperature changes in recent decades, and the second collection of papers confirm that (b) natural ocean oscillations are, in turn, modulated by solar activity.

Natural climate variability of the Arctic atmosphere, the impact of Greenland and PBL stability changes K. Dethloff *, A. Rinke *, W. Dorn *, D. Handorf *, J. H. Christensen ** * AWI Potsdam, ** DMI Copenhagen Unforced and forced long - term model integrations from 500 to 1000 years with global coupled atmosphere - ocean - sea - ice models have been analysed in order to find out whether the different models are able to simulate the North Atlantic Oscillation (NAO) similar to the real atmosphere.

Ice - sheet responses to decadal - scale ocean forcing appear to be less important, possibly indicating that the future response of the Antarctic Ice Sheet will be governed more by long - term anthropogenic warming combined with multi-centennial natural variability than by annual or decadal climate oscillations.»

But efforts to tease out the impact of human - driven global warming in the region are complicated by the big influence around the Bering Sea of natural variations in ocean conditions, including the Pacific Decadal Oscillation.

This cooling is the result of natural long - term swings in ocean surface temperatures, particularly swings in the Interdecadal Pacific Oscillation or mega-El Niño - Southern Oscillation, which has lately been in a mega-La Niña or cool phase.

Our main conclusion was that a), we had, in fact, gone back to a busy period in the Atlantic, Gulf of Mexico, and the Caribbean, and b), it was caused by a natural fluctuation in the Atlantic Ocean and the atmosphere, called the Atlantic multi-decadal oscillation.

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.

However the natural climate is always changing due to cycles of the sun, ocean oscillations like El Nino and the Atlantic Multidecadal Oscillation that alter the direction and strength of the winds, or natural landscape successions.

This is the type of variability that comes from natural interactions between the ocean and the atmosphere (i.e., that due to phenomena like the El - Nino / Southern Oscillation or perhaps the Atlantic Multidecadal Oscillation).

Researchers observed a natural, regular, multidecadal oscillation between periods of Southern Ocean open - sea convection, which can act a release valve for the ocean's heat, and non-convective perOcean open - sea convection, which can act a release valve for the ocean's heat, and non-convective perocean's heat, and non-convective periods.

Although global warming appears to have taken a breather over the past decade and a half, the leveling off of average global temperatures is likely just a temporary phenomenon that is due to other climate influences from the sun's radiance level to natural temperature oscillations in the Pacific ocean.

Previous large natural oscillations are important to examine: however, 1) our data isn't as good with regards to external forcings or to historical temperatures, making attribution more difficult, 2) to the extent that we have solar and volcanic data, and paleoclimate temperature records, they are indeed fairly consistent with each other within their respective uncertainties, and 3) most mechanisms of internal variability would have different fingerprints: eg, shifting of warmth from the oceans to the atmosphere (but we see warming in both), or simultaneous warming of the troposphere and stratosphere, or shifts in global temperature associated with major ocean current shifts which for the most part haven't been seen.

Despite this increasing greenhouse gas - induced warming of the oceans, the ocean doesn't warm in a linear manner due to a number of factors, one of these being a natural decadal - scale variation in the way heat is mixed into the oceans by winds - the Interdecadal Pacific Oscillation (IPO).

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.

I'm not a climate scientist, but I would have considered it good science to understand the effects of each of the major natural changes that are known to affect global temperatures, including the multidecadal ocean oscillations, long before I started looking at any anthropogenic effects.

One of the prime suspects for this has been an increase in trade winds which help to mix heat into the subsurface ocean - part of a natural oscillation known as the Interdecadal Pacific Oscillaoscillation known as the Interdecadal Pacific OscillationOscillation (IPO).

The two candidates (apart from volcanic forcing) are solar variability and the natural internal variability of the coupled ocean atmosphere system, e.g. the multi-decadal and longer oscillations such as the NAO, PDO, etc..

The retreat of Greenland's glaciers has been largely due to intruding warm waters driven by changes in natural ocean oscillations.

They do a poor job at simulating the observed modes of natural internal climate variability (e.g. the multidecadal ocean oscillations).

A new article co-authored by the other of us (Michael Mann), shows that natural ocean oscillations have recently acted to temporarily slow the warming of the Earth's surface temperatures, in combination with a relatively quiet sun, and active volcanoes.

With the recent decline in solar flux and the shift to cool phases of ocean oscillations, natural climate change suggests that although glacier retreat and sea level rise will likely continue over the next few decades, the rates of sea level rise and glacier retreats will slow down.The next decade will provide the natural experiment to test the validity of competing hypotheses.

Third, another new study determines that CO2's impact has been minor compared to the impact of a natural cooling Pacific Ocean, due to a natural oscillation named ENSO - as the prominent climate scientist said: «My mind has been blown by a new paper...»

Before the industrial period, the natural variations in the total amount of effective solar radiative forcing reinforce the thermal contrasts both between the ocean and continent and between the Northern and Southern Hemispheres resulting in the millennium - scale variation and the quasi-bicentennial oscillation in the GM index.

The near - linear rate of anthropogenic warming (predominantly from anthropogenic greenhouse gases) is shown in sources such as: «Deducing Multidecadal Anthropogenic Global Warming Trends Using Multiple Regression Analysis» «The global warming hiatus — a natural product of interactions of a secular warming trend and a multi-decadal oscillation» «The Origin and Limits of the Near Proportionality between Climate Warming and Cumulative CO2 Emissions» «Sensitivity of climate to cumulative carbon emissions due to compensation of ocean heat and carbon uptake» «Return periods of global climate fluctuations and the pause» «Using data to attribute episodes of warming and cooling in instrumental records» «The proportionality of global warming to cumulative carbon emissions» «The sensitivity of the proportionality between temperature change and cumulative CO2 emissions to ocean mixing»

I say my conclusion was «not unreasonable» because Dr. Scafetta, in a posting at WattsUpWithThat today, has also concluded that, once the natural 60 - year cycles of the great ocean oscillations are accounted for (and it may be these cycles that express themselves in changes in cloud cover such as that which Dr. Pinker had identified), the anthropogenic component in global warming is considerably less than the IPCC imagines.

Now forced to explain the warming hiatus, Trenberth has flipped flopped about the PDO's importance writing «One of the things emerging from several lines is that the IPCC has not paid enough attention to natural variability, on several time scales,» «especially El Niños and La Niñas, the Pacific Ocean phenomena that are not yet captured by climate models, and the longer term Pacific Decadal Oscillation (PDO) and Atlantic Multidecadal Oscillation (AMO) which have cycle lengths of about 60 years.»

Regional circulation patterns have significantly changed in recent years.2 For example, changes in the Arctic Oscillation can not be explained by natural variation and it has been suggested that they are broadly consistent with the expected influence of human - induced climate change.3 The signature of global warming has also been identified in recent changes in the Pacific Decadal Oscillation, a pattern of variability in sea surface temperatures in the northern Pacific Ocean.4

The El Nino Southern Oscillation is a natural — as opposed to man - made - future of the Pacific Ocean, as areas of the Pacific periodically warm then cool every few years, causing significant sea level rises and falls every few years in step with the co-oscillations of the ocean and atmospOcean, as areas of the Pacific periodically warm then cool every few years, causing significant sea level rises and falls every few years in step with the co-oscillations of the ocean and atmospocean and atmosphere.

The world ocean warming is likely due to a combination of natural variability, such as the Pacific Decadal Oscillation, and human - induced effects, say the scientists who calculated the warming.

We think that the bump in temperatures in 1935 - 45 (common in both the ocean AND the land) is evidence of an natural oscillation or a response to unknown forcing, clearly not AGHGs.

One of these — stretching from Cape Hatteras to Miami — was driven by the overlapping effects of El Niño, that periodic blister of heat most obvious in the eastern Pacific, and the North Atlantic Oscillation, another entirely natural periodic shift in atmosphere and current that can pile up the ocean waters.