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Comments on “Methodology and Results of Calculating Central California Surface Temperature Trends: Evidence of Human-Induced Climate Change?”

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  • 1 School of Natural Sciences, University of California, Merced, Merced, California
  • | 2 Energy and Environment Directorate, Lawrence Livermore National Laboratory, Livermore, California
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Understanding the causes of observed regional temperature trends is essential to projecting the human influences on climate, and the societal impacts of these influences. In their recent study, Christy et al. (2006, hereafter CRNG06) hypothesized that the presence of irrigated soils is responsible for the rapid warming of summer nights occurring in California’s Central Valley over the last century (1910–2003), an assumption that rules out any significant effect due to increased greenhouse gases, urbanization, or other factors in this region. Their interpretation is based on an apparent contrast in summer nighttime temperature trends between the San

Understanding the causes of observed regional temperature trends is essential to projecting the human influences on climate, and the societal impacts of these influences. In their recent study, Christy et al. (2006, hereafter CRNG06) hypothesized that the presence of irrigated soils is responsible for the rapid warming of summer nights occurring in California’s Central Valley over the last century (1910–2003), an assumption that rules out any significant effect due to increased greenhouse gases, urbanization, or other factors in this region. Their interpretation is based on an apparent contrast in summer nighttime temperature trends between the San

Corresponding author address: Céline Bonfils, Lawrence Livermore National Laboratory, P.O. Box 808 L-103, Livermore, CA 94550. Email: bonfils2@llnl.gov

Understanding the causes of observed regional temperature trends is essential to projecting the human influences on climate, and the societal impacts of these influences. In their recent study, Christy et al. (2006, hereafter CRNG06) hypothesized that the presence of irrigated soils is responsible for the rapid warming of summer nights occurring in California’s Central Valley over the last century (1910–2003), an assumption that rules out any significant effect due to increased greenhouse gases, urbanization, or other factors in this region. Their interpretation is based on an apparent contrast in summer nighttime temperature trends between the San

Understanding the causes of observed regional temperature trends is essential to projecting the human influences on climate, and the societal impacts of these influences. In their recent study, Christy et al. (2006, hereafter CRNG06) hypothesized that the presence of irrigated soils is responsible for the rapid warming of summer nights occurring in California’s Central Valley over the last century (1910–2003), an assumption that rules out any significant effect due to increased greenhouse gases, urbanization, or other factors in this region. Their interpretation is based on an apparent contrast in summer nighttime temperature trends between the San

Corresponding author address: Céline Bonfils, Lawrence Livermore National Laboratory, P.O. Box 808 L-103, Livermore, CA 94550. Email: bonfils2@llnl.gov

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