With the
help of a comment on my last post, thanks for that, I finally figured out what
the cooling period between 1940 -1975 may have caused.
It is quite
good explained in the blog (http://manmadeclimatechange.blogspot.de/2015/10/correlation-between-co2-and-temperature.html)
and in the paper from Thomson et al 2008. I will give you a short summary.
If you look
at the following graph, you will see that the global temperature decline is
mainly because of a temperature decline in the seawater temperature. In
particular the temperature drop in 1945. The explanation for that is, according
to the Thomson et al paper, a change in the methods of collecting temperature
data. But not only in the change of the methods, but more in the problem of
mixing different methods. Especially after WWII the nations, who were collecting
data, changed from mainly UK to mainly US. Through this change it is now very
difficult to evaluate the right temperature. This confusion could have caused
the abrupt decline in temperature in 1945.
Figure 3: Thomson et al 2008
To
conclude, the argument used in the video loses meaningfulness.
Good post. The video might loose meaningfulness in one respect, but do you think it has implications for how the debate on global warming is carried out?
AntwortenLöschenNo not directly, but it stresses the correlation between CO2 and climate warming, which supports the argument of a man made climate change.
AntwortenLöschen