大气和海洋科学快报（英文版）2021，Vol.14Issue(1)：7-13,7.
青藏高原与印度洋热力对比及其与南亚夏季风的关系
Thermal contrast between the Tibetan Plateau and tropical Indian Ocean and its relationship to the South Asian summer monsoon
摘要
Abstract
The land-sea thermal contrast is an important driver for monsoon interannual variability and the monsoon onset.The thermal contrast between the Tibetan Plateau and the tropical Indian Ocean at the mid-upper troposphere is proposed as a thermal contrast index (TCI) for South Asian monsoon.The authors investigate the TCI associated with South Asian summer monsoon (SASM) intensity and SASM onset.It is observed that the TCI considering the Tibetan Plateau and tropical Indian Ocean demonstrates a stronger and closer correlation with SASM intensity (0.87) than either the Tibetan Plateau (0.42) or tropical Indian Ocean (-0.60) singly.It is implied that the TCI could preferably represent the impact of land-sea thermal condition on SASM activity.Further analysis reveals that the evolution of TCI is related to the SASM onset.The TCI is almost always larger in early onset years than it is in late onset years during the period before SASM onset.In addition,the change of the pentad-by-pentad increment of TCI leads the SASM variation.The correlation coefficient between the TCI increment and SASM index reaches a maximum when the TCI increment leads by 15 pentads.The results of this study show that the TCI plays an important role in SASM activities and is a potential indicator for SASM onset forecasting.关键词
青藏高原/印度洋/热力对比/南亚夏季风/季风爆发Key words
Tibetan Plateau/Indian Ocean/Thermal contrast/South Asian summer monsoon/Monsoon onset引用本文复制引用
Zhangqun Li,Ziniu Xiao..青藏高原与印度洋热力对比及其与南亚夏季风的关系[J].大气和海洋科学快报（英文版）,2021,14(1):7-13,7.基金项目
This work was supported jointly by the Strategic Priority Research Program of the Chinese Academy of Sciences[Grant number XDA20060501]and the National Natural Science Foundation of China[Grant numbers U1902209 and 91637208]. （）
