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M. Hoerling, J. Eischeid, A. Kumar, R. Leung, A. Mariotti, K. Mo, S. Schubert, and R. Seager

). These included remote effects of tropical sea surface temperatures, land use practices, and the potential feedbacks that abundant soil-related aerosols may have exerted on rainfall. An important role for random atmospheric internal variability has also been proposed ( Hoerling et al. 2009 ). However, since the 1930s, summer rainfall has shown less severe declines in the 1950s and 1970s, while the last two decades were noted mostly by abundant summer rainfall (e.g., Wang et al. 2009 ). Looking at

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Richard Seager, Lisa Goddard, Jennifer Nakamura, Naomi Henderson, and Dong Eun Lee

States ( ). Mexico has been suffering a drought since the mid-1990s ( Seager et al. 2009 ; Stahle et al. 2009 ) so the severity of the 2011 drought further revealed the climatic vulnerability of Mexico. This paper focuses on the Texas–northern Mexico (hereafter TexMex) drought and addresses the question of what caused it. This is an important question in that it has been argued that anthropogenic global warming should lead to aridification of the

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