2-2. Without wind, weather would re

2-2。没有风，天气将几乎保持不变。风是气团运动的物理表现。这是气压水平差异的结果。空气从高压区域流向产生风的低压区域。太阳辐射和由此产生的地球表面不均匀加热是驱动力，产生引起风的压差。压力梯度在天气地图上显示为一系列等压线或连接等压气压位置的等压线。等压线越靠近，压力梯度越陡，风速越高（图2-1）。

2-2. 没有风，天气将基本保持不变。风是空气质量移动的物理表现。它是气压水平差异的结果。空气从高压区流向产生风的低压区。太阳辐射和由此产生的地球表面不均匀加热是产生产生风的压差的驱动力。压力梯度在天气图上显示为连接等等气压位置的一系列等值或压力轮廓。近在一起出现，压力梯度越陡，风速越高（图2-1）。

2-2. Without wind, weather would remain virtually unchanged. Wind is a physical manifestation of the move ment of air masses. It is the result of horizontal differences in air pressure. Air flows from a high-pressure area to a low-pressure area producing winds. Solar radiation and the resultant uneven heating of the earth’s surface is thedriving force creating the pressure differentials that cause wind. The pressure gradient is shown on weather maps as a series of isobars or pressure contours connecting places of equal barometric pressure. The closertogether the isobars appear, the steeper the pressure gradient and the higher the wind speed (Figure 2-1).<br>