Recent changes in county-level corn yield variability in the United States from observations and crop models

Change trends of corn yield variability (%/yr) based on observations and simulations by statistical model and 11 AgMIP gridded crop models for the whole country as a whole. 15-year time window during 1980-2010 is used to calculate the interannual variability, based on which the linear trend is fitted and normalized by the mean yields. *indicates the significant trend at the 95% level.47