A Diagnosis and Numerical Experiment of Responses about Summer Temperature Change in Northwest China on Surface Sensible Heat Anomaly in the Qinghai-Xizang Plateau
中国西北夏季气温变化及其对青藏高原地面感热异常响应的诊断与数值试验

With principal component analysis, rotated principal component analysis and atmospheric circulation model, the space-time anomaly feature of summer temperature anomaly in Northwest China and the response on surface sensible heat anomaly in the Qinghai-Xizang Plateau are studied by using the temperature data in June, July and August for the period 1960 to 1990 from 90 observational stations. Results show that the summer temperature variations are spatially well consistent, however, impact in topographic and underlying surface, the summer temperature anomaly have six principal climate type areas: the Qinghai Plateau, Hetao, the Northern Xinjiang, the Weishui River basin, west of the Southern Xinjiang, the Eastern Xinjiang-Hexi Corridor. The summer temperature has been becoming colder in greater part of Northwest China except the Qinghai Plateau and the Northern Xinjiang. When 500 hPa height departure in the North Hemisphere appear Eurasian Pattern oscillation, temperature in the greater part of Northwest China is higher (or lower) in summer. When the sensible heat flux anomaly in the underlying surface is stronger (or weaker) in the Qinghai-Xizang Plateau in summer, the western Northwest China is warmer (or colder), and eastern is colder (or warmer) in the same time.