Climate, Terrain and Its Influence in Qinghai-Tibet Region

The influence of topography on climate in Qinghai-Tibet region is divided into two aspects:

1, dynamic action: forcing the branch of westerly belt: clockwise circulation in the north, dry and cold climate; The south side circulates counterclockwise, and the climate is warm and humid.

For example, Lanzhou is dry and cold, and Sichuan Basin is warm and humid.

The southwest airflow on the south side of the plateau transports the water vapor from the Bay of Bengal to the Yangtze River basin, which has an important impact on the precipitation in eastern China.

2. Thermal effect: In winter, the plateau is the cold source, the pressure field is cold and high, and the climate is dry and cold. Summer is a heat source, with low air pressure, rising air and rainy weather. This effect is consistent with the monsoon climate caused by the distribution of land and sea, and has a strengthening and promoting effect on the monsoon climate in Southeast Asia.

In addition, the strong Qinghai-Tibet high at the top of the troposphere caused by thermal action in summer is an important atmospheric system that affects the summer weather and climate in the northern hemisphere.