Conflict between IPCC and NASA's GISS

In a report by The Associated Press 17 April 09 by Randolph E. Schmid.
IPCC lead researcher, Jonathan Overpeck of the University of Arizona said:

As global warming progresses, the increases in temperature may make the normal climate pattern more extreme, producing even more severe and prolonged droughts than those of the past.

This contrasts directly with a paper published in Journal of Climate 10 (December 1997.)

This paper showed that increased heat warmed the ocean, causing more evaporation and hence more precipitation. Seems simple to me Jonathan - over to you!

http://pubs.giss.nasa.gov/abstracts/1997/ Dai, A., I.Y. Fung, and A.D. Del Genio, 1997: Surface observed global land precipitation variations during 1900-1988. J. Climate, 10, 2943-2962, doi:10.1175/1520-0442(1997)010<2943:SOGLPV>2.0.CO;2.