Sentences with phrase «as changes in solar output»

Appreciable changes in climate are the result of changes in the energy balance of the Earth, which requires «external» forcings, such as changes in solar output, albedo, and atmospheric greenhouse gases.

When scientists use climate models for attribution studies, they first run simulations with estimates of only «natural» climate influences over the past 100 years, such as changes in solar output and major volcanic eruptions.

Not exact matches

In a recent paper in Geophysical Research Letters, Scafetta & West (S&W) estimate that as much as 25 - 35 % of the global warming in the 1980 - 2000 period can be attributed changes in the solar outpuIn a recent paper in Geophysical Research Letters, Scafetta & West (S&W) estimate that as much as 25 - 35 % of the global warming in the 1980 - 2000 period can be attributed changes in the solar outpuin Geophysical Research Letters, Scafetta & West (S&W) estimate that as much as 25 - 35 % of the global warming in the 1980 - 2000 period can be attributed changes in the solar outpuin the 1980 - 2000 period can be attributed changes in the solar outpuin the solar output.

Periods of volcanism can cool the climate (as with the 1991 Pinatubo eruption), methane emissions from increased biological activity can warm the climate, and slight changes in solar output and orbital variations can all have climate effects which are much shorter in duration than the ice age cycles, ranging from less than a decade to a thousand years in duration (the Younger Dryas).

However, there is significant debate as to the cause of these D - O events, with changes in solar output being just one possibility (NOAA Paleoclimatology).

Our Sun is a relatively stable star, but changes in solar energy output, such as during massive solar flares, can still have an impact.

The consensus is that several factors are important: atmospheric composition (the concentrations of carbon dioxide, methane); changes in the Earth's orbit around the Sun known as Milankovitch cycles (and possibly the Sun's orbit around the galaxy); the motion of tectonic plates resulting in changes in the relative location and amount of continental and oceanic crust on the Earth's surface, which could affect wind and ocean currents; variations in solar output; the orbital dynamics of the Earth - Moon system; and the impact of relatively large meteorites, and volcanism including eruptions of supervolcanoes.

> Some of the «wiggles» in temperature (such as the Little Ice Age signal) correlate with changes in solar output.

The key factor isn't changes in solar output, but rather changes in the sun's magnetosphere A stronger field shields the earth more from cosmic rays, which act as «seeds» for cloud formation.

It's looking more and more like most climate change can be pegged to changes in solar output, either directly through additional warming or indirectly as decreases in solar output allow more cosmic rays to reach the atmosphere, causing increased cloud nucleation and therefore increasing the earth's albedo and reflecting more solar radiation.

The RealClimate post on Polar Amplification... http://www.realclimate.org/index.php/archives/2006/01/polar-amplification/... begins with the statement, «' Polar amplification» usually refers to greater climate change near the pole compared to the rest of the hemisphere or globe in response to a change in global climate forcing, such as the concentration of greenhouse gases (GHGs) or solar output (see e.g. Moritz et al 2002).»

We find that changes in naturally occurring climate variability patterns can play a major role in large regional changes (especially cooling over North America and Europe as solar output decreases).

The models currently assume a generally static global energy budget with relatively little internal system variability so that measurable changes in the various input and output components can only occur from external forcing agents such as changes in the CO2 content of the air caused by human emissions or perhaps temporary after effects from volcanic eruptions, meteorite strikes or significant changes in solar power output.

I have sought the best empirical evidence to show how changes in incoming solar radiation, accounted for by intrinsic solar magnetic modulation of the irradiance output as well as planetary modulation of the seasonal distribution of sunlight, affects the thermal properties of land and sea, including temperatures.

How about this one, ««Polar amplification» usually refers to greater climate change near the pole compared to the rest of the hemisphere or globe in response to a change in global climate forcing, such as the concentration of greenhouse gases (GHGs) or solar output (see e.g. Moritz et al 2002).

They concluded that with a bit of help from changes in solar output and natural climatic cycles such as the El Nino Southern Oscillation (ENSO), the growth in the volume of aerosols being pumped up power station chimneys was probably enough to block the warming effect of rising greenhouse gas emissions over the period 1998 - 2008.

They concluded that with a bit of help from changes in solar output and natural climatic cycles such as the El Nino Southern Oscillation (ENSO),..

The IPCC reports document the plausible intrinsic solar output increase of perhaps 0.12 W / m2 since 1750 as being the only significant natural agency in terms of climate change: if my calculations of the natural changing insolation values are correct, then the IPCC is demonstrated to have erred in that respect.

While I wouldn't think that many people here would be so obtuse as to exclude solar output in any climate equation, I would make note of the point that variances of solar output are rarely discussed in «warmer» circles in relation to «Climate Change».

The only thing that I would contend could be added would be long slow cumulative changes in solar output other than raw TSI namely changes in the mix of particles and wavelengths over longer periods of time such as MWP to LIA to date and which seem to have some effect on surface pressure distribution and global albedo so as to alter solar shortwave into the oceans and thus affecting the energy available to the ENSO process.

Traditionally, climate - model projections have only accounted for external forcings, such as man - made greenhouse gases, past volcanic eruptions and projected changes in solar output.

As they stand at present the models assume a generally static global energy budget with relatively little internal system variability so that measurable changes in the various input and output components can only occur from external forcing agents such as changes in the CO2 content of the air caused by human emissions or perhaps temporary after effects from volcanic eruptions, meteorite strikes or significant changes in solar power outpuAs they stand at present the models assume a generally static global energy budget with relatively little internal system variability so that measurable changes in the various input and output components can only occur from external forcing agents such as changes in the CO2 content of the air caused by human emissions or perhaps temporary after effects from volcanic eruptions, meteorite strikes or significant changes in solar power outpuas changes in the CO2 content of the air caused by human emissions or perhaps temporary after effects from volcanic eruptions, meteorite strikes or significant changes in solar power output.

Any change in net solar power output is relatively small as Leif says and being a seperate issue apparently incapable of explaining observed variability in the climate system.

I have previously described why the solar effect on climate is not as generally thought but for convenience I will summarise the issue here because it will help readers to follow the logic of the NCM.Variations in total solar power output on timescales relevant to human existence are tiny and are generally countered by a miniscule change in the speed of the hydrological cycle as described above.

Computer models are an essential tool in understanding how the climate will respond to changes in greenhouse gas concentrations, and other external effects, such as solar output and volcanoes.

Other than say a change in solar output, or the Solary System moving from clear to dusty space (as I think is expected in a few millenia) what else do we know of in nature that happens as fast and persists as long as the rate of increase of anthropogenic GH gases?

Hi BigJon Changes in solar output contributed perhaps as much as 50 % to the early 20th century warming.

Changes in solar output influence how much of the sun's energy the Earth's surface receives as a whole; more or less solar energy means warmer or cooler global climate.

While the Earth's atmosphere has seen higher levels of carbon dioxide than it does now, as well as higher temperatures and far greater sea levels, those instances were due to natural drivers of climate change, such as periodic variations in the planet's orbit and in solar energy output.

«Polar amplification» usually refers to greater climate change near the pole compared to the rest of the hemisphere or globe in response to a change in global climate forcing, such as the concentration of greenhouse gases (GHGs) or solar output (see e.g. Moritz et al 2002).