Abstract
The vertical motion of air is closely related to the amount of precipitation that falls in a particular region. The Tibetan Plateau and the North Pacific are important determinants of the East Asian climate. We use climate diagnosis and statistical analysis to study the vertical motion of the air over the North Pacific and Tibetan Plateau and the relationship between the vertical motion of air over them and the climate in East Asia. Here we show that there is a downward movement of air over the Tibetan Plateau during the winter, with a maximum velocity of downward movement at 500 hPa, whereas there is an upward movement of air with a maximum velocity of upward movement at 600 hPa during the summer. Precipitation in East Asia has a significant negative correlation (The correlation coefficient exceeds −0.463 and confidence level is greater than 99%) with the vertical motion of air over the Tibetan Plateau and the North Pacific during both the winter and summer. There is also a negative correlation of precipitation in the region south of the Yangtze River with the vertical motion of air over the Tibetan Plateau in winter, whereas the area of negative correlation to the vertical motion of air over the North Pacific in winter is located to the east of the Tibetan Plateau and the Yangtze–Huaihe river basin. The research results provide a climatic framework for the vertical motion of air over both the Tibetan Plateau and the North Pacific.
Highlights
The formation of rainfall is a complex atmospheric process and is influenced by many different factors, one of the most important of which is the upward motion of air.East Asia, located between the Tibetan Plateau and the Pacific Ocean, is the most populous region in the world
The Tibetan Plateau is the highest plateau on the Earth
The calculation of the empirical orthogonal function (EOF) is as follows: Xm×n = Vm×p × Tp×n where Xm×n is a data matrix of the original vertical velocity composed of n observations of m spatial points, p is the number of spatial eigenvectors
Summary
The formation of rainfall is a complex atmospheric process and is influenced by many different factors, one of the most important of which is the upward motion of air. East Asia, located between the Tibetan Plateau and the Pacific Ocean, is the most populous region in the world. The Tibetan Plateau is the highest plateau on the Earth. Driven by its thermal and dynamic effects, the air over the Tibetan Plateau sinks vertically in winter and rises vertically in summer. The changeover between the ascending and descending motion of air occurs in spring and autumn [1,2,3]. The thermal effect of the Tibetan Plateau affects the surrounding vertical circulation (the Bay of Bengal) [4]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
