Due to the sun radiation, the heated and expanded surface air ascends and meets the cold descending air, this air convection causes the turbulence which is obvious at noon.

• 这是因为太阳光的照射，使地面的空气受膨胀上升，冷空气下降补充，形成空气对流而引起的颠簸，中午飞行尤为明显。