The authors thank NASA for providing funding for this research through the Grant NNG04GP13P. The authors are also thankful to Dr. Eileen J. Kladivko (Agronomy Department, Purdue University) for her helpful discussions and comments. The authors appreciate the suggestions of the reviewers, which helped to improve the overall quality of this paper. This manuscript is Purdue Climate Change Research Center (PCCRC) Paper 0716.
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