Summer aridity in the United States: Response to mid-Holocene changes in insolation and sea surface temperature

Diffenbaugh, N.S., M. Ashfaq, B. Shuman, J.W. Williams and P.J. Bartlein, Summer aridity in the United States: Response to mid-Holocene changes in insolation and sea surface temperature, Geophysical Research Letters, 33, L22712, doi:10.1029/2006GL028012, 2006.