/sci/ - Science & Math

>>15773695
kek forgot picrel

>>14828784
>There is no average temperature that can rise or fall.
Are you actually retarded?
>Similar to someone building the average between his deep-freezer an the cooking plates.
Yeah, if both rise by 10°, the average also rises. If one rises by 1° and the other by 3°, the average rises by 2° (assuming, they are the same size, which is less clearly defined than with the surface of the Earth).
>nearly 100% spectral overlap with water vaper
>vaper
kys. But also, that's wrong and/or misleading. If you look at the change in spectrum from 1970 to 1996, you see that the part in the CO2 spectrum that does not overlap clearly shows a difference.

>Change in spectrum from 1970 to 1996 due to trace gases. 'Brightness temperature' indicates equivalent blackbody temperature (Harries 2001).

>>14698831
>The greenhouse effect due to atmospheric CO2 levels off at about 100 ppm.
Then explain this.
In 1970, NASA launched the IRIS satellite that measured infrared spectra between 400 cm-1 to 1600 cm-1. In 1996, the Japanese Space Agency launched the IMG satellite which recorded similar observations. Both sets of data were compared to discern any changes in outgoing radiation over the 26 year period (Harries et al. 2001). The resultant change in outgoing radiation was as in picrel: Change in spectrum from 1970 to 1996 due to trace gases. 'Brightness temperature' indicates equivalent blackbody temperature (Harries et al. 2001).

What they found was a drop in outgoing radiation at the wavelength bands that greenhouse gases such as carbon dioxide (CO2) and methane (CH4) absorb energy. The change in outgoing radiation is consistent with theoretical expectations. Thus the paper found "direct experimental evidence for a significant increase in the Earth's greenhouse effect".

This result has been confirmed by subsequent papers using more recent satellite data. The 1970 and 1997 spectra were compared with additional satellite data from the NASA AIRS satellite launched in 2003 (Griggs & Harries 2004). This analysis was extended to 2006 using data from the AURA satellite launched in 2004 (Chen et al. 2007). Both papers found the observed differences in CO2 bands matching the expected changes from rising carbon dioxide levels. Thus we have empirical evidence that increased CO2 is causing an enhanced greenhouse effect.