Science News Everyday 08.06.17(2)

Ozone's Influence

In recent decades, the westerly winds of the southern hemispheric jet stream have accelerated on the poleward side of the jet; this acceleration has been attributed to a combination of effects from increasing greenhouse gas concentrations and decreasing amounts of stratospheric ozone, and this strengthening has been predicted to continue.Sonet al.(p.1486) find differently. A recent set of models, which include fully interactive stratospheric chemistry, project that the summer tropospheric westerly winds in the Southern Hemisphere will decrease on the poleward side of the jet, owing to the gradual diminution of the ozone hole through the year 2050. This would have important consequences for climate in the Southern Hemisphere, and highlights the importance of stratospheric ozone recovery as an agent of climate change.

臭氧的影响

近十几年来，南半球的急流西风在其面向南极的一面一直在不停加速，其原因是温室气体浓度的升高，以及平流层臭氧的减少，有预测这样的影响将会进一步加剧。Son 等人（见1486页）却有不同的发现。最近他们建立了一个模型系统，在该系统中充满了能够相互作用的平流层物质。实验结论为：预计到2050年，由于全年臭氧空洞的逐渐减少，南半球夏季对流层西风在其面向南极的一面将会减少（速？）。从该结论可以得到关于南半球气候的重要推论，同时强调了平流层臭氧的恢复将有助于气候的改善。