The black curve in both panels shows the departure of the observed Atlantic tropical cyclone power dissipation index from mean conditions for the period 1946 - 2007. (earthzine.org)
Here, the author draws causality relationships between global mean near - surface air temperatures and Atlantic sea surface temperatures and hurricane power dissipation indexes using statistical causality tests. (realclimate.org)
There is, however, limited evidence from a relatively short time period that storm strength is increasing, such as the Emanuel (2005) «power dissipation index» of hurricane intensity. (sciencedaily.com)