10月地球航拍照:太平洋火环VS彩色海湾(图)(10)
中国上空的烟雾
如图所示,这是10月28日中国境内上空厚重密集的烟雾,最密集的灰褐色烟雾分布上黄河峡谷的低洼地形和靠近吕梁山脉的中国北部平原的西半部。由于温度倒置使得中国东部上空出现污染性烟雾,通常情况下,冷空气在一定的海拔高度,但偶尔冷空气层会诱捕在热空气层之下。由于冷空气比上方的热空气层更密集,两个空气层并不会混合,而在冷空气层中的污染物质则更低地接近地球表面。温度倒置通常出现于冬季,当较长寒冷夜晚侵袭地面,寒冷的地面将冷却最接近地面的空气层,从而使更高海拔位置的空气更暖和。这两个空气层并不容易混和,如果出现风流,温度倒置现象可持续1天后结束。
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