Shrink wrap

日期:2017-11-15 04:10:07 作者:牛浣 阅读:

THE outer edge of the Earth’s atmosphere, the ionosphere, is contracting at a rate of 1 kilometre every five years, says the British Antarctic Survey. Global warming is almost certainly to blame. The finding comes from an analysis of 600 000 measurements of the ionosphere’s height taken over the past 38 years using echo sounding ( Journal of Geophysical Research, vol 103, p 20 774). The drop in height reflects a dramatic cooling of the upper air that in turn has led to a drop in atmospheric pressure, says Martin Jarvis of the BAS. This cooling is a result of the accumulation of greenhouse gases,