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Jeffrey A. Hicke, David B. Lobell, and Gregory P. Asner

( Hicke et al., 2002b ; Lobell et al., 2002 ). Changes in agricultural production therefore have the potential to significantly impact the U.S. carbon cycle. Carbon fixed by crops may be transferred to the soil through root production or through residues remaining after harvest. In addition, the harvested mass (e.g., grain) is consumed and respired back to the atmosphere. This harvest may be respired locally, may be transported long distances within the United States before being consumed, or may be

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Christopher Potter, Pusheng Zhang, Steven Klooster, Vanessa Genovese, Shashi Shekhar, and Vipin Kumar

represents the gross monthly atmospheric input of water to that basin. A portion of this gross PREC input flux is lost back to the atmosphere within the same month as PET flux, resulting in a net atmospheric input water flux to the basin area, computed as PREC − PET with a minimum monthly value of zero. We computed monthly PET flux from air surface temperature ( New et al., 2000 ) according to the method of Thornthwaite ( Thornthwaite, 1948 ), as documented in Potter and Klooster ( Potter and Klooster

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