Issue Date: October 6, 2008
Chemical Equator Divides Hemispheres
Earth's polluted Northern Hemisphere is separated from its cleaner Southern Hemisphere by a sharp gradient in the troposphere known as a chemical equator, according to observations by Jacqueline F. Hamilton at the University of York, in England, and colleagues. Scientists previously thought that the atmospheric boundary between the hemispheres was formed solely by a meteorological feature known as the Intertropical Convergence Zone (ITCZ). This cloudy belt, where the trade winds from each hemisphere meet, . . .
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