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The destructive potential of tropical cyclones (“typhoons”) in, the Western North Pacific Main Development Region, decreased by 35% over the past decade
See
Are Tropical Storms Becoming More Destructive? Will They? by Marlo Lewis of CEI.
"Lin & Chan, 2015,
a study published in Nature Communications, finds that the destructive
potential of tropical cyclones (“typhoons”) in the most active and
hazardous tropical cyclone basin on Earth, the Western North Pacific
Main Development Region, decreased by 35% over the past decade.
Lin and Chan use a metric called the Power Dissipation Index (PDI) to
measure the destructive potential of Asia-Pacific typhoons. The PDI is a
product of three factors: storm frequency, duration, and intensity. In
the past decade, typhoon intensity increased due to increases in ocean
heat content. However, typhoon frequency and duration decreased due to
stronger vertical wind shear and lower vorticity in the storm genesis
region. The declines in frequency and duration overpowered the increase
in intensity, producing a net decrease in PDI of approximately 35%.
Based on climate modeling studies, Lin and Chan project that global
warming will induce an additional 15% decrease in the Asia-Pacific PDI.
In their words, “Although both the intensity and duration increased
under global warming, there was an even larger typhoon frequency
reduction of 25.7%. As a result, the typhoon PDI decreased by 15.2%.”"
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