Sentences with phrase «wavelength radiation from the surface»

Increased amounts of gases such as carbon dioxide make the atmosphere absorb long - wavelength radiation from the surface more strongly and also emit more radiation back down towards the surface.

Not exact matches

When the team looked at the overall balance between the radiation upward from the surface of the ice sheet and the radiation both upward and downward from the upper levels of the atmosphere across all infrared wavelengths over the course of a year, they found that in central Antarctica the surface and lower atmosphere, against expectation, actually lose more energy to space if the air contains greenhouse gases, the researchers report online and in a forthcoming Geophysical Research Letters.

The wavelengths of co2 absorption in absorption spectrums that are relevant, clearly show how the interaction between co2 and heat from the surface result in a large decrease in the amount of radiation.

Because the wavelength of emitted EM radiation varies with the temperature of the source, it does so in the form of longer - wave IR than that received from the Sun — the Earth's surface is significantly cooler than that of the Sun.

Adding CO2 does not (at least not before the climate response, which is generally stratospheric cooling and surface and tropospheric warming for increasing greenhouse gases) decrease the radiation to space in the central portion of the band because at those wavelengths, CO2 is so opaque that much or most radiation to space is coming from the stratosphere, and adding CO2 increases the heights from which radiation is able to reach space, and the stratospheric temperatures generally increase with increasing height.

In the context of the real atmosphere, an observer looking down from space will see Planckian radiation upwelling at the surface temperature for those wavelengths where the air is very transparent.

The effect where, adding a «new» absorption band and increasing the absorption, there may initially be warming of the colder layers, etc, followed by a stage of upper level or near - TOA cooling — this includes the warming from absorption from increased radiation from the surface + troposphere — which will be greater when more of the spectrum, especially near wavelengths where the emitted spectral flux change is greatest, has a greater amount of absorption.

Back radiation in the far infra - red from the Greenhouse Effect occurs at wavelengths centred around 10 micrometres, well off the scale of this chart, and can not penetrate the ocean beyond the surface «skin».

The Earth receives energy from the Sun in the form of visible light and ultraviolet radiation, which is then re-radiated away from the surface as thermal radiation in infrared wavelengths.

Btw, if anyone can provide any evidence of more than 10 watts per square meter of any kind radiation from the Sun [or from anywhere] other than the energy emitting from the Sun in wavelength in the range 250 to 2500 nm and intersecting the earth surface, I would find this very fascinating.

A consequence of the model you have proposed would seem to be that the «back radiation» due to CO2 interception of surface emitted (from solid or liquid continuum thermal radiation can consist only of the specific wavelengths that the CO2 absorbed in the first place; since you say no net energy is exchanged between the CO2 and the Atmosphere.

Radiation comes in from the sun (solar radiation at short wavelengths), and every body radiates according to its temperature (proportional to the fourth power of absolute temperature), so that on Earth we, and the surface and atmosphere radiate at infrared wavelengths.

What you find is that in the region between 8 and 14 microns the equivalent radiation temperature is the surface temeprature of earth (which means the radiation comes from the surface — nothing else is warm enough) whereas at the GHG absorption wavelengths the equivalent radiation temperature is that of the tropopause.

Testimony to this assumption is the term that has been employed for more than a century to describe the radiation in all wavelengths received from the Sun: the so - called «solar constant,» whose value at the mean Sun - Earth distance is a little over 1 1/3 kilowatts per square meter of surface.

5) Thus the presence of water vapour and CO2 means that less energy is radiated into space from within their characteristic radiation bands so the temperature of the earth's surface has to increase in order for energy radiated at other wavelengths to increase to compensate.

If one looks at the satellite measurements of radiation from the earth you see that at certain wavelengths the radiation is characteristic of the temperature of the earth's surface.

Net result of all this Photon energy from 15um Earth surface up going to increase in temperature of atmosphere and increasingly more radiation in wavelengths > 15um.

The surface provides «surface forward radiation» or «surface upward radiation» or «surface away - from - the - surface long - wavelength EM radiation» to the atmosphere (350 W / m).

I understand the superficial attractiveness behind the proposition that the atmoshpere contains some gases that are largely transparent to incoming solar radiation and therefore the majority of this solar radiation finds its way through the atmosphere to the surface whereupon it heats the surface and this heat is, inter alia, radiated from the surface at a different wavelength at which wavelength the atmosphere (or some gases within the atmosphere) is not transparent such that some of this radiated enerrgy is «trapped» thereby effectively warming the planet.

Ira — regarding your summary comment 4) at May 8, 2011 at 7:51 pm my comment — NO, the atmosphere does NOT emit LWIR across a distribution of wavelengths like a blackbody, see my earlier comment at Dave in Delaware says: May 8, 2011 at 7:00 am Ira Glickstein, PhD says: «4) As I understand it, the ~ 15μm radiation from the Surface to the Atmosphere is absorbed by H2O and CO2 molecules which, when excited, bump into nitrogen and oxygen and other air molecules, and heat the air.

I did not claim that the Atmosphere, after being excited by radiation coming up from the Surface, emits down towards the Surface and up towards Space exactly like a black body, just that it emits at a variety of wavelengths.

Both, however, are efficient at intercepting outgoing infrared radiation from the Earth's surface and atmosphere The disparity is due to the different wavelengths of incoming solar energy and outgoing infrared energy.

Presumbly that's converted into radiation by clouds, dust particles, etc which are radiating in roughly the same wavelength's as they absorb radiation from earth's surface.

The CO2 molecules allow the shorter - wavelength rays from the Sun to enter the atmosphere and strike the Earth's surface, but they do not allow much of the long - wave radiation reradiated from the surface to escape into space.

But you still have the whole broad wavelength range of thermal radiation, so that is either directly from the surface; so should exhibit the surface Temperature characteristic (spectrum); or it is emitted from the atmosphere.