Lyon, Bradfield, and Anthony G. Barnston. "ENSO and the spatial extent of interannual precipitation extremes in tropical land areas." Journal of Climate 18.23 (2005). http://journals.ametsoc.org/doi/full/10.1175/JCLI3598.1 Any AMS Journal older than two years is Open Access. Many journals have similar policies. For example, the Proceedings of the National Academy of Sciences makes articles older than six months open to all. Enjoy!