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2,300-year climate record suggests severe tropical droughts as northern temperatures rise
Date:5/11/2011

Northern Hemisphere temperatures by comparing their core to the movement of the Intertropical Convergence Zone (ITCZ), a balmy strip of thunderstorms near the equator where winds from the Northern and Southern Hemispheres meet. Abbott and his colleagues concluded that warm Northern temperatures such as those currently recorded lure the ITCZthe main source of monsoonsnorth and ultimately reduce the rainfall on which tropical areas rely.

The historical presence of the ITCZ has been gauged by measuring the titanium concentrations of sea sediment, according to the PNAS report. High levels of titanium in the Cariaco Basin north of Venezuela show that the ITCZ lingered in the upper climes at the same time the South American monsoon was at its driest, between 900 and 1100. On the other hand, the wettest period at Pumacochabetween 1400 and 1820, which coincided with the Little Ice Agecorrelates with the ITCZ's sojourn to far south of the equator as Northern Hemisphere temperatures cooled.


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Contact: Morgan Kelly, Pitt News Representative
mekelly@pitt.edu
412-624-4356
University of Pittsburgh
Source:Eurekalert  

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2,300-year climate record suggests severe tropical droughts as northern temperatures rise
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