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Projected twenty-first-century changes in the Central American mid-summer drought using statistically downscaled climate projections

Regional Environmental Change volume 17, pages 2421–2432 (2017)Cite this article

Abstract

In addition to periodic long-term drought, much of Central America experiences a rainy season with two peaks separated by a dry period of weeks to over a month in duration, termed the mid-summer drought (MSD). Farmers in the region have adapted their activities to accommodate this phenomenon, anticipating its arrival and estimating its duration. Among the many impacts of global warming on the region are projected changes in precipitation amount, variability, and timing, with potential to affect agriculture and food security. Using gridded daily precipitation for a historic period with future projections, we characterize the MSD across much of Central America using four measures: onset date, duration, intensity, and minimum, and test for significant changes by the end of the twenty-first century. Our findings indicate that the most significant changes are for the duration, which is projected to increase by an average of over a week, and the MSD minimum precipitation, which is projected to decrease by an average of over 26%, with statistically significant changes for the mountains and Pacific side in most of Nicaragua, Honduras, El Salvador, and Guatemala (assuming a higher emissions pathway through the twenty-first century). These changes could portend important impacts on food security for vulnerable communities through the region. We find that for the four metrics, the changes in interannual variability are small compared to historical variability and are generally statistically insignificant.

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Acknowledgements

Climate scenarios used were from the NEX-GDDP dataset, prepared by the Climate Analytics Group and NASA Ames Research Center using the NASA Earth Exchange, and distributed by the NASA Center for Climate Simulation (NCCS). This material is based upon work supported in part by the National Science Foundation under Grant No. 1539795.

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Authors and Affiliations

  1. Civil Engineering Department, Santa Clara University, Santa Clara, CA, 95053-0563, USA

    Edwin P. Maurer

  2. Civil & Environmental Engineering Department, Stanford University, Stanford, CA, USA

    Nicholas Roby

  3. Department of Environmental Studies and Sciences, Santa Clara University, Santa Clara, CA, USA

    Iris T. Stewart-Frey & Christopher M. Bacon

Authors
  1. Edwin P. Maurer
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  2. Nicholas Roby
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  3. Iris T. Stewart-Frey
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  4. Christopher M. Bacon
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Correspondence to Edwin P. Maurer.

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Editor: Wolfgang Cramer

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Maurer, E.P., Roby, N., Stewart-Frey, I.T. et al. Projected twenty-first-century changes in the Central American mid-summer drought using statistically downscaled climate projections. Reg Environ Change 17, 2421–2432 (2017). https://doi.org/10.1007/s10113-017-1177-6

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Keywords

  • Central America
  • Drought
  • Precipitation
  • Projections
  • Food security