Sentences with phrase «radiative absorption by»

This would require the radiative effect of clouds to change from one that increases atmospheric radiative absorption by about \ (0.5 \, \ hbox -LCB- Wm -RCB- ^ -LCB--2 -RCB- \, \ hbox -LCB- K -RCB- ^ -LCB--1 -RCB- \) to one that decreases it by \ -LRB--3.5 \, \ hbox -LCB- Wm -RCB- ^ -LCB--2 -RCB- \, \ hbox -LCB- K -RCB- ^ -LCB--1 -RCB- \).

Not exact matches

This can not be calculated by hand (the number of absorption lines and the effects of pressure broadening etc. preclude that), but it can be calculated using line - by - line radiative transfer codes.

But the troposphere can still warm with an increased radiative cooling term because it is also balanced by heating through latent heat release, subsidence, solar absorption, increased IR flux from the surface, etc..

In the tugging on the temperature profile (by net radiant heating / cooling resulting from radiative disequilibrium at single wavelengths) by the absorption (and emission) by different bands, the larger - scale aspects of the temperature profile will tend to be shaped more by the bands with moderate amounts of absorption, while finer - scale variations will be more influenced by bands with larger optical thicknesses per unit distance (where there can be significant emission and absorption by a thinner layer).

In an atmosphere open to the sky as opposed to a container in a laboratory a density change is forced by the absorption of radiative energy by the GHG molecules.

The radiative absorption capability of CO2 allows atmospheric molecules to reach a higher temperature than that imparted to them by energy at the surface so they rise to a higher location than would be predicted from their weight and their individual gas constants.

Absorption in the atmosphere of solar radiation by CO2 doesn't buy you any reduction in the radiative forcing which is conventionally applied to the whole atmosphere and surface.

If, for instance, CO2 concentrations are doubled, then the absorption would increase by 4 W / m2, but once the water vapor and clouds react, the absorption increases by almost 20 W / m2 — demonstrating that (in the GISS climate model, at least) the «feedbacks» are amplifying the effects of the initial radiative forcing from CO2 alone.

Your hypothesis assumes that increased absorption of energy in the troposphere will be transmitted to the surface by convection, since radiative transfer doesn't change if the temperature remains constant, and the radiative imbalance at the TOA wouldn't change.

Instead atmospheric physics uses the fundamental equations (the radiative transfer equations) which determine absorption and emission of radiation by water vapor, CO2, methane, and other trace gases.

«Because the solar - thermal energy balance of Earth [at the top of the atmosphere (TOA)-RSB- is maintained by radiative processes only, and because all the global net advective energy transports must equal zero, it follows that the global average surface temperature must be determined in full by the radiative fluxes arising from the patterns of temperature and absorption of radiation.»

Vis.: www.garfield.library.upenn.edu/classics1981/A1981LQ21800001.pdf Even more to the point, he goes on to state that [quote] «The regions of validity of the linear, square root, and nonoverlapping approximations were considered in this article...» [endquote] and notes that the summary of the [quote] «various models and approximations for band absorption» [endquote] given in that article had apparently been useful in many later studies requiring [quote] «mathematical calculation» [endquote] of the radiative exchange by infrared bands.

The radiative energy inciding on our skin is absorbed by the molecules of water in our bodies by Resonance Absorption.

They assume a basis for all this, the radiative heat absorption by CO2 (this is in their founding documents), and produce massive summaries, generally including long term ordinary linear regression in approriately applied to a time series, and then make a statement such as «an increase of.2 deg C / decade».

Pekka, to claim that the temperature effect of CO2 absorbing IR in the atmosphere is unmeasurable except in the atmosphere is a good way of glossing over the fact that the claimed warming phenomenon (backradiation or insulation or IR absorption) is: a. imprecisely described, and non-existent according to G&T b. untested in the laboratory — probably because it hasn't been precisely described c. very small according to the precisely measured radiative transfer data precisely modeled in Spectralcalc d. confounded by other variables in the real atmosphere

In the absence of absorption of terrestrial radiation by the atmosphere (and with the other caveats about still having the same albedo and such), that average temperature would have to be 255 K at the surface because of radiative balance and then the temperature would decrease with height at the lapse rate from there.

jae says: «You are making the usual EXTREMELY big jump in saying that because there is absorption / emission by GHGs that there is a radiative GHE.»

To compute what happens quantitatively, one must solve the equations for radiative transfer absorption - line by absorption - line through the atmosphere.

That is determined by consideration of the absorption of the atmosphere of terrestrial radiation (and radiation emitted by the atmosphere), which essentially ends up determining at what altitude the temperature has to be determined via radiative balance between the Earth system (earth + atmosphere) and the sun and space [which for the earth system with its current albedo is ~ 255 K].

You are making the usual EXTREMELY big jump in saying that because there is absorption / emission by GHGs that there is a radiative GHE.

whereF is radiant - energy flux at the emitting surface; εis emissivity, set at 1 for a blackbody that absorbs and emits all irradiance reaching its emitting surface (by Kirchhoff's law of radiative transfer, absorption and emission are equal and simultaneous), 0 for a whitebody that reflects all irradiance, and (0, 1) for a graybody that partly absorbs / emits and partly reflects; and σ ≈ 5.67 x 10 — 8 is the Stefan - Boltzmann constant.

1950s: Research on military applications of radar and infrared radiation promotes advances in radiative transfer theory and measurements = > Radiation math — Studies conducted largely for military applications give accurate values of infrared absorption by gases = > CO2 greenhouse — Nuclear physicists and chemists develop Carbon - 14 analysis, useful for dating ancient climate changes = > Carbon dates, for detecting carbon from fossil fuels in the atmosphere, and for measuring the rate of ocean turnover = > CO2 greenhouse — Development of digital computers affects many fields including the calculation of radiation transfer in the atmosphere = > Radiation math, and makes it possible to model weather processes = > Models (GCMs)-- Geological studies of polar wandering help provoke Ewing - Donn model of ice ages = > Simple models — Improvements in infrared instrumentation (mainly for industrial processes) allow very precise measurements of atmospheric CO2 = > CO2 greenhouse.

He has not provided evidence showing that there are significant negative feedbacks that would offset the radiative imbalance caused by the energy absorption properties of the CO2.

He can not provided evidence showing that there are significant negative feedbacks that would offset the radiative imbalance caused by the energy absorption properties of the CO2.

The solar shortwave absorption is by far the largest uncertainty in modeling the global radiative budget.