There are generally three ways to transport water vapor: ① Horizontal transport: The transport volume depends on the strength of the wind speed and the water vapor content. The large amount of water vapor required for large-scale precipitation processes relies primarily on large-scale circulation to transport water vapor from areas of high water vapor content (usually high-temperature ocean surfaces) towards areas of precipitation. ②Vertical transport: mainly determined by the increasing speed of air flow, it can transport water vapor from the lower layer to the upper layer, making the wet layer thicker. ③ Diffusion of turbulence: Depending on the intensity of turbulence and the vertical distribution of water vapor, water vapor close to the sea surface can be transported upward.
The transport of water vapor refers to the processssus by which moisture in the atmosphere moves from one place to another due to diffusion, or from low altitude to high altitude. During the process of water vapor migration and transport, the water vapor content, direction and route of movement, and transport intensity will change at any time, which will have a significant impact about precipitation along the way.