Climate of Tiannaxi River Basin

The Tennessee River is the largest tributary of the Ohio River in the southeastern United States. It originates from the western slope of Appalachian Highlands and is formed by the confluence of the holston River and the French Broad River. It flows through Tennessee and Alabama and flows into the Ohio River near Pardew, Kentucky. The climate type of Tennessee Valley is subtropical monsoon humid climate, and the water level changes greatly in seasons. There are many rainstorms in late winter and early spring, which are easy to cause flooding and the water level is low in summer.

why is the monsoon nature of the climate in Tiantiaoxi river basin not as good as the typical monsoon on the east coast of Asia

, that is, the prevailing wind direction in a large area changes significantly with the seasons. This seasonal wind blows from the mainland to the ocean in winter and from the ocean to the mainland in summer. With the change of wind direction, the characteristics of weather and climate also change. Although the wind direction in winter and summer in eastern North America changes with the seasons, it is far less significant and stable than that in East Asia. One of the reasons is that the North American continent is smaller than Asia, and more importantly, there is a lack of topographic barriers across the east and west of the continent to separate the cold and dry air from the humid air from the Gulf of Mexico. Air masses with different properties meet, cyclone activities are frequent, and monsoon circulation is destroyed.

The atmospheric pressure distribution pattern in North America is similar to that in Eurasia, with four active centers, namely, two sub-polar low centers-Iceland low in the North Atlantic and Aleutian low in the North Pacific; Two subtropical high centers-azores high in the North Atlantic and Hawaiian high in the North Pacific. In addition, there is also an atmospheric pressure activity center in the mainland, which is high in winter and low in summer, alternating between winter and summer. The intensity and central position of the above four atmospheric activity centers also change with the seasons.