青藏高原热力异常对四川省及周边区域气象要素影响分析

利用方差统计方法分析了前期高原大气热源异常时四川及其周边区域的主汛期的位势场、相对湿度场、垂直速度场以及风场的变化。结果表明,当前期高原大气热源异常时,次年汛期四川及其周边区域的各要素场会出现显著变化。当前期高原加热场异常偏强,在次年的5~6月东北冷涡异常偏强、7~9月青藏高压显著偏强,而副热带高压的位置明显偏东;当前期高原加热场异常偏弱时,次年河套西风槽则异常偏强,青藏高压明显偏弱。其次当前期高原加热场异常时在次年汛期比湿场、垂直速度以及风场变率上都有异常。分析结果对于进一步理解青藏高原对四川及周边地区的天气及气候变化具有一定的意义。 

Analysis on the Influence of Tibetan Plateau Thermal Anomalies to Meteorological Elements in Sichuan and Neighboring Areas

By using variance analysis method, it discussed the influence of foregoing uncommon atmosphere heat over Plateau to main flood season's potential height, relative humidity, vertical velocity field and changes in wind field in Sichuan and neighboring regions.Resultsshow that the meteorological elements will change significantly in Sichuan and neighboring regions in later year when there is unusual atmospheric heat over the plateau.When there is foregoing strong surface heat over Plateau, the Northeast cold vortex will be strong in the later May and June and the Tibetan High will be significantly stronger in later July to September.At the same time, the Subtropical Pacific High's position will be easterly than normal.When there is foregoing weak surface heat over Plateau, the Hetao westerly trough is stronger in next year and the Tibetan High pressure will be significantly weaker.The results also show that the vertical velocity and the wind field will be abnormal in main flood season in later year when there is unusual changes of heat field in Plateau.The result is a good for understanding the influence of Tibetan Plateau in weather and climate change to Sichuan and surrounding areas.