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Politics : Formerly About Advanced Micro Devices

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To: PKRBKR who wrote (1004667)

3/7/2017 7:25:44 PM

From: Wharf Rat

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"What is the definition of 'e"?

IIRC, "think about dropping this class". It's a number (2.718...) whose natural log =1. IIRC, the definition of natural log was,"Yeah, no more math for you."

C =560 ppm/
Co =280 ppm
ln (560/280) = 0.693 x 5.35 = 3.71.

Here's a table

Table 1 contains results of simple calculations based on observations listed above. For example, if we assume that from the beginning of the industrial era the cumulative emissions were 500 GtC (equivalent to 1833 bn tons CO2), then the atmosphere absorbed 45% of the emitted CO2, or 225 GtC. As a result atmospheric CO2 concentration has increased by 225/2.12=106 ppm, reaching level of 386 ppm, which, in turn, increases the radiative forcing by 5.35·ln (386/280) = 1.72 [W/m2]. The expected (equilibrium) temperature rise will therefore be 3·1.72/3.7=1.39 [°C].

Cumulative emissions [GtC]	Left in the atmosphere [GtC]	CO2concentration [ppm]	Radiative forcingRF [W/m2]	Equilibrium temp. anomaly [°C]
0	0	280	0.00	0.00
500	225	386	1.72	1.39
1000	450	492	3.02	2.44
1500	675	598	4.06	3.29
2000	900	705	4.94	3.99
2500	1125	811	5.69	4.60

Table 1. Relationship between cumulative emissions and temperature anomaly. NOTE: our model (and Figure 1) considers only carbon dioxide emissions and does not include the effects of other greenhouse gases or the cooling effect of sulfuric aerosols (these two contributions are approximately cancelling each other).

skepticalscience.com

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