Re-examination of Trends Related to Tropical Cyclone Activity over the Western North Pacific Basin |
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| Authors: | SONG Jinjie HAN Juejing LI Siji WANG Yuan and WU Liguang |
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| Institution: | Key Laboratory of Mesoscale Severe Weather/MOE, and School of Atmospheric Sciences, Nanjing University, Nanjing 210093,Key Laboratory of Mesoscale Severe Weather/MOE, and School of Atmospheric Sciences, Nanjing University, Nanjing 210093,Key Laboratory of Mesoscale Severe Weather/MOE, and School of Atmospheric Sciences, Nanjing University, Nanjing 210093,Key Laboratory of Mesoscale Severe Weather/MOE, and School of Atmospheric Sciences, Nanjing University, Nanjing 210093,Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing 210093 |
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| Abstract: | In order to re-examine some trends related to tropical cyclones (TCs) over
the western North Pacific since 1949, the unreliable maximum sustained wind
(Vmax) recorded in the 1949--1978 TC best-track data from the Shanghai
Typhoon Institute was modified based on the wind--pressure relationships
(WPRs) in this study. Compared to the WPR scheme based on the cyclostrophic
balance, the WPR scheme based on the gradient balance could give a better
fit to TCs under higher wind speeds and could introduce smaller estimated
errors for TCs locating at higher latitudes as well as TCs landing on the
continent. After the Vmax modification based on minimum sea-level
pressure and TC center latitude, the revised annual number of category 4--5
typhoons shows no long-term trend, while the potential destructiveness
measured by power-dissipation index decreases slightly, and this trend is
not significant in the period 1949--2008. |
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| Keywords: | tropical cyclone wind--pressure relationship gradient balance power-dissipation index |
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