2011-02-28 07:29:49Migration of the Intertropical Convergence Zone
John Hartz
John Hartz
john.hartz@hotmail...
98.122.68.19

The current (March 2011) issue of Scientific America contains an excellent artcle, "A Shifting Band of Rain" by Juian B. Sachs and Conor L Myhrvold.

The article in brief: 

  • The tropical rain band that wraps the globe north of the equator migrates as atmospheric temperature changes, altering rainfall patterns worldwide.
  • Data from sediments in Pacific Island lakes show that the band is at 3°N to 10°N, as far north as it has ever been in at least 1,200 years.
  • At current warming rates, the band could shift north by five degrees by 2100, drying out farmland for millions of people in Ecuador, Colombia and elsewhere.
  • Multiyear drought conditions in the southwestern U.S. could persist as that area becomes more like the semiarid region of northern Mexico.

http://www.scientificamerican.com/article.cfm?id=a-shifting-band-of-rain