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http://www.businessweek.com/articles/2013-12-11/yes-you-can-see-chinese-smog-from-space
NASA Earth Observatory posted the satellite image with explanatory text on its website yesterday. Rudolf Husar, director of the Center for Air Pollution Impact and Trend Analysis at Washington University, explains why satellites can visually differentiate among fog, smog, and ordinary cloud cover: “The fog has a smooth surface on the top, which distinguishes it from mid- and high-level clouds that are more textured and have distinct shadows on their edge. If there is a significant haze layer on top of the fog, it appears brownish,” he said. “In this case, most of the fog over eastern China is free of elevated haze, and most of the pollution is trapped in the shallow winter boundary layer of a few hundred meters.”
P.S.
轉自 FB
曾經有一個流傳很久的謊言,說中國萬里長城是從太空唯一看得見的地球建築物,後來中國自己送人上太空後,確定這說法是假的。
不要緊,現在真有中國製造的東西,從太空也看得見了。 |
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