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Decreasing Trend of Western North Pacific Tropical Cyclone inner-core size over the Past Decades

Journal of Meteorological Research 2021年第4期35卷 635-645页

作者： Hanrui SHOU Tim LI Yuan SUN Lu WANG Jia LIU Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environmental ChangeNanjing University of Information Science&TechnologyNanjing 210044China International Pacific Research Center and Department of Atmospheric Sciences University of Hawaii at ManoaHonoluluHI96822USA College of Meteorology and Oceanography National University of Defense TechnologyNanjing 211101China

Studies on tropical cyclone(TC)inner-core size have become increasingly active in recent years.However,few studies have investigated the trend of TC inner-core size.Here,we introduce a new index to measure TC inner-core size and calculate the observed trend.This index can greatly reduce the influence of data heterogeneity and uncertainty.It also considers public concern because the new index is mainly determined by the inner-core size of strong TCs,which attract more public attention than weak TCs.The results show that in the past decades,TC inner-core size has a significant downtrend that is significant above the 99%confidence level when the new index is used.We also show that this trend is probably related to the increase in TC intensity and relatively small inner-core size of strong TCs.Moreover,relative sea surface temperature(SST)is assumed to make contributions to the downtrend of TC inner-core size,which has a significant negative correlation with the new index.

关键词： tropical cyclone(TC) inner-core size trend intensity

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Sensitivity of Quasi-Periodic Outer Rainband Activity of Tropical Cyclones to the Surface Entropy Flux

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Acta meteorologica Sinica 2013年第5期27卷 636-657页

作者：李青青端义宏 State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences Key Laboratory of Meteorological Disaster of Ministry of Education Nanjing University of Information Science & Technology Shanghai Typhoon Institute and Laboratory of Typhoon Forecast Techniques China Meteorological Administration

The influence of outer-core surface entropy fluxes （SEFs） on tropical cyclone （TC） outer rainband activity is investigated in this study with a fully compressible,nonhydrostatic model.A control simulation and two sensitivity experiments with the outer-core SEF artificially increased and decreased by 20% respectively were conducted to examine the quasi-periodic outer rainband behavior.Larger negative horizontal advection due to the greater radial wind and the positive contribution by asymmetric eddies leads to a longer period of outer-rainband activity in the SEF-enhanced experiment.The well-developed outer rainbands in the control and SEF-reduced simulations significantly limit the TC intensity,whereas such an intensity suppression influence is not pronounced in the SEF-enhanced experiment.As diabatic heating in outer rainbands strengthens the outer-core tangential wind,the quasi-periodic activity of outer rainbands contributes to the quasi-periodic variations of the inner-core size of the TCs.

关键词： tropical cyclone outer rainband intensity inner-core size

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