Figure 1 : Time series of PDI and related parameters.

From: Recent decrease in typhoon destructive potential and global warming implications

Figure 1

Time evolution of the observed PDI and other parameters over the western North Pacific MDR in the past two decades. The trend line for each time series, based on linear regression is also depicted. Standard deviations are depicted by dotted curves. (a) PDI, (b) SST, (c) the depth of the 26 °C isotherm (D26) and TCHP (Tropical Cyclone Heat Potential or upper ocean heat content (UOHC)). (d) Typhoon case number in the typhoon season (July–October) of a year, (e) as in d, but for the averaged typhoon duration, (f) as in d, but for the averaged typhoon intensity.