Changes of the temperature field during storms and Effects of Cold Air on Structure of Thermal Fields in Typhoons – Case in China and Vietnam Sea

Abstract

This study goal is to explore Changes of the temperature field during storms and Effects of Cold Air on Structure of Thermal Fields in Typhoons. Typhoons are a kind of tropical cyclone that often occur on tropical or subtropical sea surfaces where the sea surface temperature is higher than 26.5 ◦C (HU et al, 2000). The results show that When affected by cold air, the hot core structure in the storm is broken. Temperature tends to increase gradually from west to east and from north to south. Temperatures in the northern and western regions were still lower than in the center of the storm, but in the eastern and southern areas of the center of the storm, the temperature was higher than in the center of the storm. Near the surface, below 800hPa, the temperature of the center of the storm is also lower than the average temperature of the areas around the center of the storm (except for typhoon Kammuri). The decrease in temperature in the lower central region and areas north and west of the center of the storm is due to the intrusion of the CA. This result demonstrates the role of cold air to the structure of the temperature field in the storm. However, further explanations are needed for the distribution of the maximum hot cores in the center of the storm.