The average flow field in China at a height of 3,000 meters in January

Note

Black lines in the figure indicate: Pneumatic flow

The red line in the figure indicates the high sub-axis

The red dotted line in the figure indicates the groove line or the shear line

In the figure, the letter "A" stands for: cyclone circulation center

The letter C in the figure indicates the cyclonic circulation center

The map comes from the Chinese Geographic Atlas of China in January 3000 m height of the average flow field