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Analyzing projected changes and trends of temperature and precipitation in the southern USA from 16 downscaled global climate models

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Abstract

This study aims to examine how future climate, temperature and precipitation specifically, are expected to change under the A2, A1B, and B1 emission scenarios over the six states that make up the Southern Climate Impacts Planning Program (SCIPP): Oklahoma, Texas, Arkansas, Louisiana, Tennessee, and Mississippi. SCIPP is a member of the National Oceanic and Atmospheric Administration-funded Regional Integrated Sciences and Assessments network, a program which aims to better connect climate-related scientific research with in-the-field decision-making processes. The results of the study found that the average temperature over the study area is anticipated to increase by 1.7°C to 2.4°C in the twenty-first century based on the different emission scenarios with a rate of change that is more pronounced during the second half of the century. Summer and fall seasons are projected to have more significant temperature increases, while the northwestern portions of the region are projected to experience more significant increases than the Gulf coast region. Precipitation projections, conversely, do not exhibit a discernible upward or downward trend. Late twenty-first century exhibits slightly more precipitation than the early century, based on the A1B and B1 scenario, and fall and winter are projected to become wetter than the late twentieth century as a whole. Climate changes on the city level show that greater warming will happened in inland cities such as Oklahoma City and El Paso, and heavier precipitation in Nashville. These changes have profound implications for local water resources management as well as broader regional decision making. These results represent an initial phase of a broader study that is being undertaken to assist SCIPP regional and local water planning efforts in an effort to more closely link climate modeling to longer-term water resources management and to continue assessing climate change impacts on regional hazards management in the South.

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Acknowledgment

This research is funded by the Southern Climate Information Planning Program (SCIPP; http://www.southernclimate.org). We thank the National Weather Center for computing resources and acknowledge our colleagues in Hydrometeorology and Remote Sensing Lab (http://hydro.ou.edu) for their technical support. In addition, we acknowledge the modeling groups, the Program for Climate Model Diagnosis and Intercomparison (PCMDI), and the WCRP's Working Group on Coupled Modeling (WGCM) for their roles in making available the WCRP CMIP3 multi-model dataset. Support of this dataset is provided by the Office of Science, US Department of Energy.

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Authors and Affiliations

  1. School of Civil Engineering and Environmental Science, University of Oklahoma, 120 David L. Boren Blvd., National Weather Center ARRC 4610 Suite, Norman, OK, 73072, USA

    Lu Liu, Yang Hong, Christopher N. Bednarczyk, Bin Yong & Pradeep Adhikari

  2. Southern Climate Impacts Planning Program, Oklahoma Climate Survey, University of Oklahoma, Norman, OK, USA

    Lu Liu, James E. Hocker & Mark A. Shafer

  3. Southern Climate Impacts Planning Program, Louisiana State University, Baton Rouge, LA, USA

    Lynne M. Carter

  4. NOAA/National Severe Storms Laboratory, Norman, OK, 73072, USA

    Jonathan J. Gourley

  5. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, 210098, China

    Bin Yong

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  1. Lu Liu
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  2. Yang Hong
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  3. James E. Hocker
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  4. Mark A. Shafer
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  5. Lynne M. Carter
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  7. Christopher N. Bednarczyk
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  8. Bin Yong
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  9. Pradeep Adhikari
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Correspondence to Yang Hong.

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Liu, L., Hong, Y., Hocker, J.E. et al. Analyzing projected changes and trends of temperature and precipitation in the southern USA from 16 downscaled global climate models. Theor Appl Climatol 109, 345–360 (2012). https://doi.org/10.1007/s00704-011-0567-9

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  • DOI: https://doi.org/10.1007/s00704-011-0567-9

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