Tropical Cyclone Intensity Discrepancies
Song, J.-J., Wang, Y. and Wu, L. 2010. Trend discrepancies among three best track data sets of western North Pacific tropical cyclones. Journal of Geophysical Research 115: 10.1029/2009JD013058.
To help resolve the discrepancies exhibited by the JTWC typhoon database, Song et al. analyzed differences of track, intensity, frequency and the associated long-term trends of those TCs that were simultaneously recorded and included within the best track data sets of the JTWC, the RSMC and the STI from 1945 to 2007.
In the words of the Chinese researchers, "though the differences in TC tracks among these data sets are negligibly small, the JTWC data set tends to classify TCs of category 2-3 as category 4-5, leading to an upward trend in the annual frequency of category 4-5 TCs and the annual accumulated power dissipation index, as reported by Webster et al. (2005) and Emanuel (2005)." And they add that "this trend and potential destructiveness over the period 1977-2007 are found only with the JTWC data set," while noting that actual downward trends "are apparent in the RSMC and STI data sets."
In light of the findings of Song et al., plus those of the other scientists they cite, there would appear to be little doubt that the studies of Emanuel (2005) and Webster et al. (2005) -- which climate alarmists long hailed as proof positive of their claim that global warming leads to more intense tropical cyclones/hurricanes -- actually provide no such evidence at all.
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