AIRS-observed warm core structures of tropical cyclones over the western North Pacific

作者：Gao, Si^*; Chen, Baiqing; Li, Tim; Wu, Naigeng; Deng, Wenjian

来源：Dynamics of Atmospheres and Oceans, 2017, 77: 100-106.

DOI：10.1016/j.dynatmoce.2016.12.001

• Tropical cyclone
• Warm core structure
• Tropical storm formation
• Rapid intensification
• Satellite observation

Atmospheric Infrared Sounder (AIRS) temperature profiles during the period 2003-2013 are used to examine the warm core structures and evolution characteristics associated with the formation and development of western North Pacific (WNP) tropical cyclones (TCs). The warm core with a steady 1.5-K warming in the layer of 500-300 hPa occurs 24h prior to tropical storm formation. Apparent eye warming extends upward to upper troposphere and downward to near surface after tropical storm formation. TC intensity shows a robust positive correlation with the warm core strength and has a weaker but still significant positive correlation with the warm core height (the weaker correlation is primarily attributed to the scattered warm core heights of weak TCs). Future 24-h intensity change of TCs has little correlation with the warm core height while it has a significant negative correlation with the warm core strength. Weak to moderate warm core at 500-200 hPa may be a necessary but not sufficient initial condition for TC rapid intensification. AIRS-observed warm core structures, in combination with other environmental factors, have the potential to improve the prediction of tropical storm formation and rapid intensification of WNP TCs.

• 出版日期2017-3
• 单位南京信息工程大学; 中国气象局广州热带海洋气象研究所