Bad vibrations - Revision history

Trevor at 12:53, 3 December 2019

2019-12-03T12:53:58Z

Trevor at 12:51, 3 December 2019

2019-12-03T12:51:24Z

Trevor at 12:46, 3 December 2019

2019-12-03T12:46:16Z

Trevor: /* Bad vibrations? A brief explanation of the heat trapping properties of CO2 */

2019-12-03T12:45:50Z

‎Bad vibrations? A brief explanation of the heat trapping properties of CO2

Trevor at 12:45, 3 December 2019

2019-12-03T12:45:24Z

Trevor at 12:28, 3 December 2019

2019-12-03T12:28:30Z

Trevor at 12:26, 3 December 2019

2019-12-03T12:26:28Z

Trevor at 12:24, 3 December 2019

2019-12-03T12:24:05Z

Trevor at 12:11, 3 December 2019

2019-12-03T12:11:30Z

Trevor at 12:08, 3 December 2019

2019-12-03T12:08:37Z

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 == Relevance to the 'Greenhouse' Effect ==
-Presence of the above mentioned gases in the atmosphere contribute to the Earth being warmer than it would otherwise be. In fact without the any greenhouse gases in the atmosphere Earth would be frozen solid with sub-zero temperatures across the globe.
+Presence of the above mentioned gases in the atmosphere contribute to the Earth being warmer than it would otherwise be. In fact without '''any''' greenhouse gases in the atmosphere Earth would be frozen solid with sub-zero temperatures across the globe.
 The analogy is drawn between a warmer-than-expected Earth and a greenhouse which allows tropical plants to grow in a temperate climate. The mechanisms for both are:

@@ Line 15: / Line 15: @@
 == Relevance to the 'Greenhouse' Effect ==
-Presence of the above mentioned gases in the atmosphere contribute to the Earth being warmer than it would otherwise be and the analogy is drawn with a greenhouse which allows tropical plants to grow in a temperate climate. The mechanisms are:
+Presence of the above mentioned gases in the atmosphere contribute to the Earth being warmer than it would otherwise be. In fact without the any greenhouse gases in the atmosphere Earth would be frozen solid with sub-zero temperatures across the globe.
-* Solar energy in the visible light portion of the spectrum shines straight through the atmosphere / glass panels which are transparent to light
+The analogy is drawn between a warmer-than-expected Earth and a greenhouse which allows tropical plants to grow in a temperate climate. The mechanisms for both are:
 * Earth / greenhouse plants warm and re-radiate energy as infra red radiation - invisible to human eyes
 * Heat radiation increases with absolute temperature to the fourth power, so (°C + 273)<sup>4</sup>. A 0.1% increase in temperature results in a 0.4% increase re-radiated heat

← Older revision		Revision as of 12:46, 3 December 2019
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	[[File:Transmittance.gif\|792px\|frameless\|left]]<br style="clear:both;" />		[[File:Transmittance.gif\|792px\|frameless\|left]]<br style="clear:both;" />
−
	== In conclusion ==		== In conclusion ==

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 It is also instructive to see the effect of increasing CO<sub>2</sub> levels on transmittance. While increasingly high concentrations will, eventually completely block infra red radiation at the '''relevant wave number''' transmittance cannot drop below zero. At other wave numbers / lengths frequencies the atmosphere remains transparent to IR. The numerical value inset in the animation below refers to ppm CO<sub>2</sub>
-[[File:Transmittance.gif|792px|frameless|left]]
+[[File:Transmittance.gif|792px|frameless|left]]<br style="clear:both;" />
 == In conclusion ==

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 [[File:Co2a.gif|frameless|left]][[File:Co2c.gif|frameless]]
-[[File:CO2 transmittance.png|670px|frameless|left]]
+[[File:CO2 transmittance.png|670px|frameless|left]]<br style="clear:both;" />
-It is also instructive to see the effect of increasing CO<sub>2</sub> levels on transmittance. While increasingly high concentrations will, eventually completely block infra red radiation at the '''relevant wave number''' at other wave numbers / lengths frequencies the atmosphere remains transparent to IR
+It is also instructive to see the effect of increasing CO<sub>2</sub> levels on transmittance. While increasingly high concentrations will, eventually completely block infra red radiation at the '''relevant wave number''' transmittance cannot drop below zero. At other wave numbers / lengths frequencies the atmosphere remains transparent to IR. The numerical value inset in the animation below refers to ppm CO<sub>2</sub>
 [[File:Transmittance.gif|792px|frameless|left]]

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 * Bending (both modes)  at wave number 667 cm<sup>-1</sup>
-These bending modes are illustrated below along with a graph of infrared transmittance (scale 0=opaque to 100=transparent) versus wave number
+These bending modes are illustrated below along with a graph of infrared transmittance (scale 0=opaque to 100=transparent) versus wave number related to CO<sub>2</sub> levels at the present day
 [[File:Co2a.gif|frameless|left]][[File:Co2c.gif|frameless]]
-[[File:CO2 transmittance.png|frameless|left]]
+[[File:CO2 transmittance.png|800px|frameless|left]]

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 Presence of the above mentioned gases in the atmosphere contribute to the Earth being warmer thanit would otherwise be and the analogy is drawn with a greenhouse which allows tropical plants to grow in a temperate climate. The mechanisms are:
-* Solar energy in the visible light portion of the spectrum shine straight through the atmosphere / glass panels which are transparent to light
+* Solar energy in the visible light portion of the spectrum shines straight through the atmosphere / glass panels which are transparent to light
 * Earth / greenhouse plants warm and re-radiate energy as infra red radiation - invisible to human eyes
-* Heat radiation increases with absolute temperature to the fourth power, so (°C + 273)<sup>4</sup>
+* Heat radiation increases with absolute temperature to the fourth power, so (°C + 273)<sup>4</sup>. A 0.1% increase in temperature results in a 0.4% increase re-radiated heat
-* If the air / glass panels were completely transparent to infra red (heat) radiation the temperature would increase until an equilibrium were reached where energy in = energy out
+* ''If'' the air / glass panels were completely transparent to infra red (heat) radiation the temperature would increase until an equilibrium were reached where energy in = energy out
-* If the air / glass panels were partially opaque to infra red, the heat would have to 'try harder' to escape - by raising the temperature until a new equilibrium point were established
+* ''Given'' the air / glass panels are partially opaque to infra red, the heat has to 'try harder' to escape - as the system is temporarily in a non-equilibrium state, temperature rises until a new equilibrium point ''is'' established
 == Specific absorption characteristic of CO<sub>2</sub> ==