How do you calculate short wave radiation?

To calculate the shortwave outgoing radiation we multiply the known surface albedo of 0.8 by the incoming shortwave radiation of 120 W/m2. With these two values, we have all we need to find the SWnet part of our equation: SWnet = SWincoming – SWoutgoing. SWnet = SWincoming – αSWincoming.

What is clear sky radiation?

Clear sky irradiation is defined as an estimate of the radiation incident on the Earth’s surface in the absence of clouds over the entire sky dome. Even if in the absence of clouds, solar radiation is influenced by the parameters of the clear atmosphere, such as aerosols, water vapor, ozone, etc.

What is considered shortwave radiation?

Shortwave radiation is a radiant energy produced by the sun with wavelengths ranging from infrared through visible to ultraviolet. Shortwave radiation is therefore exclusively associated with daylight hours for a particular location on the Earth’s surface.

How do you calculate long wave radiation?

Spectrally integrated longwave radiation can be estimated from the Stefan-Boltzmann equation, Ql = eoT4, where e is the thermal emissivity, o is the Stefan-Boltzmann constant, 5.67 X 10-8 W m-2 K-4, and T is the absolute temperature of the emitting surface.

Do clouds scattered solar radiation?

Low, thick clouds primarily reflect solar radiation and cool the surface of the Earth. High, thin clouds primarily transmit incoming solar radiation; at the same time, they trap some of the outgoing infrared radiation emitted by the Earth and radiate it back downward, thereby warming the surface of the Earth.

What is all sky shortwave downward irradiance?

Abstract. The earth’s surface shortwave downward radiation (SWDR), which is generally defined as the sum of the incoming solar energy over the earth’s surface in the shortwave spectrum (0.3–3.0 μm), is a key component of the surface radiation budget (SRB).

What does high shortwave radiation mean?

Shortwave radiation contains higher amounts of energy and longwave radiation contains a smaller amount of energy. Therefore, the sun gives off shortwave radiation, as it is extremely hot and has a lot of energy to give.

What does shortwave radiation do?

Incoming ultraviolet, visible, and a limited portion of infrared energy (together sometimes called “shortwave radiation”) from the Sun drive the Earth’s climate system. Some of this incoming radiation is reflected off clouds, some is absorbed by the atmosphere, and some passes through to the Earth’s surface.

What is net shortwave radiation?

Earth’s net radiation, sometimes called net flux, is the balance between incoming and outgoing energy at the top of the atmosphere. It is the total energy that is available to influence the climate. Energy comes in to the system when sunlight penetrates the top of the atmosphere.

What is considered longwave radiation?

emitted from Earth is called longwave radiation; it falls within the infrared portion of the spectrum and has typical wavelengths of 4 to 30 micrometres (0.0002 to 0.001 inch). Wavelengths of radiation emitted by a body depend on the temperature of the body, as specified by Planck’s radiation law.

What wavelength is sky blue?

The blue sky spectrum presents across 450–485 nm, the wavelengths of the color blue.

Which material absorbs the most solar radiation?

A “flat black” material having no glossy reflections absorbs the most solar energy. Conversely, light colors reflect more light than dark ones, and white reflects the most.

What is reflected shortwave radiation?

Reflected Shortwave radiation refers to the total of all the shortwave electromagnetic energy, or sunlight at wavelengths ranging from 0.3 to 5 micrometers, that escapes from the top of the Earths’ atmosphere back into space. About 30% of the incoming solar energy is reflected.

What is the net flux of shortwave radiation at the snow surface?

The net flux of shortwave radiation, SN, at the snow surface is given by: where Sf is the reflected shortwave radiation and a is the albedo, i.e. the spectrally integrated reflectance as discussed in Section 2.5.2.

How does shortwave radiation reach the ground?

A non-negligible part of downward shortwave radiation reaches the ground as diffuse, nearly isotropic radiation. Its percentage depends primarily on cloudiness and isotropy greatly simplifies its parameterization.

What part of the solar spectrum is shortwave radiation?

The part of the solar spectrum up to 4.0 pm is usually called shortwave radiation, representing about 99.2% of Stoa. However, solar radiation is absorbed by some atmospheric constituents and is reflected and scattered by clouds and aerosol.