Thank you for your paper.
The graph on the page 687 looks rather like lots of other graphs we see these days including mean temperatures of various types.
If one ignores the sinosodial element owing to the regular fluxuation, the graph empirically seems to look like a graph of carbon dioxide concentrations in the atmosphere.
May I quote from the paper?
"Figure 1 shows the PDI for the North Atlantic and the September mean tropical sea surface temperature (SST) averaged over one of the prime genesis regions in the North Atlantic20. There is an obvious strong relationship between the two time series (r 2 ¼ 0.65), suggesting that tropical SST exerts a strong control on the power dissipation index. The Atlantic multi-decadal mode discussed in ref. 10 is evident in the SSTseries, as well as shorter period oscillations possibly related to the El Nin˜o/Southern Oscillation and the North Atlantic Oscillation. But the large upswing in the last decade is unprecedented, and probably reflects the effect of global warming. We will return to this subject below. Figure 2 shows the annually accumulated, smoothed PDI..."
One of the dodges of global climate change deniers is to point to the fact that there are periodic fluctuations in various climatic features, including droughts, floods, hurricanes, glacial melting, and so on. They then jump to the conclusion that asserting the existence of such fluctuations represents a cause for eliminating anthropogenic climate change from each event cited as evidence for the effect. Another is to attempt to represent scientific uncertainty as the negation of scientific results.
It is not possible to prove, of course, that no hurricane like Katrina could have existed without global climate change. Clearly hurricanes of this type have existed in the past. However it is also clear
a priori that the intensity of the extreme climatic of all types as measured are all near record intensity
as predicted many years ago.
The World Meterological Organization issued an unprecedented warning on exactly this subject a few years ago.
Just one Publication on the subject (2003) from this organization has a blurb, specifically mentioning tropical cyclones, reading as follows:
" 952 Our future climate
2003; 36 PP. E-F-R-S
ISBN: 92-63-10952-4 PRICE: CHF 15.-
Issued for World Meteorological Day 2003, this brochure explains, in terms accessible to the general public, the climate system and the climate change processes, as well as model projections of our future climate with its far-reaching consequences to society. WMO's expertise and networks of NMHSs place it in a foremost position to monitor and project the future state of our climate. The brochure also explains why the unprecedented weather- and climate-related extreme events, such as floods, droughts and tropical cyclones in various parts of the world, are glimpses of what could be awaiting future generations if human-induced change to our climate is not brought under control..."
http://www.wmo.ch/web/etr/pdf_web/WMOCatalog05.pdfThe World Meteorological Organization is the international
scientific (as in not Repuke controlled) organization of the United Nations.
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