Abstract:Based on Multiplatform Tropical Cyclone Surface Wind Analysis (MTCSWA) data from NOAA/NESDIS during 2007-2014, statistic characteristics of 210 named TCs’structures in the North Western Pacific and the South China Sea are analyzed. Compared with the maximum wind speed (VMAX) from CMA best tracks, the VMAX from MTCSWA is 10%-15 % smaller on average. Overestimation, especially for weaker TCs, is observed. Statistical relationship is provided between radius of maximum wind speed (RMAX) and VMAX, and the density distributions of RMAX in different regions are calculated. For those TCs stronger than STS, the density distributions show no regional differences while the less intensified groups show obvious structure distributions in the North Western Pacific, the Northern and Eastern China Seas and the South China Sea. Especially, in the South China Sea, the distribution difference gets much broadly from 50 to 100 km. By analyzing the distributions of four quadrants, the eastern parts of R34 is comparably larger than that in western parts, but there is no such a character in both R50 and R65. From the case study of Super TY Bolavan (1215), an eye wall replacement and inner core structure change can be observed. During that ERC period, the distance between inner and outer eye wall (R2-R1) is reduced along with V1’s decreasing and V2’s increasing. Meanwhile the original intensity shows temporary fluctuation.