SOURCE : https://docs.google.com/file/d/0B5OYZdqOzxSLdjZ6X0R4S0ZfX1E/edit
This article is interesting and points toward ocean temperature shift in the tropical pacific as being a main factor for the cooling period between 1940-1975. They point to the effects of El Nino and La Nina to explain that the cooling and warming in these regions coincide with the periods of global warming and cooling on the Earth. This source does not seem as reliable as the other one, because this one says there are also skeptics and also points to the aerosol's as another possible reason for cooling and heating. As for the hiatus after 1998 this article points towards warming in the deep ocean during this period and that we seen warmer surface temperatures during periods of extreme heating. Jeff Tollefson covers climate, energy, and the environment for Nature, which is the article described above.
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