Cited by 1,978Hydrology and Drought AnalysisPlant Water Relations and Carbon DynamicsClimate variability and models

The DOI matches its Crossref record; 49 of the 50 references it cites were found in a registry or an index.

Little change in global drought over the past 60 years

Abstract

Drought is expected to increase in frequency and severity in the future as a result of climate change, mainly as a consequence of decreases in regional precipitation but also because of increasing evaporation driven by global warming. Previous assessments of historic changes in drought over the late twentieth and early twenty-first centuries indicate that this may already be happening globally. In particular, calculations of the Palmer Drought Severity Index (PDSI) show a decrease in moisture globally since the 1970s with a commensurate increase in the area in drought that is attributed, in part, to global warming. The simplicity of the PDSI, which is calculated from a simple water-balance model forced by monthly precipitation and temperature data, makes it an attractive tool in large-scale drought assessments, but may give biased results in the context of climate change. Here we show that the previously reported increase in global drought is overestimated because the PDSI uses a simplified model of potential evaporation that responds only to changes in temperature and thus responds incorrectly to global warming in recent decades. More realistic calculations, based on the underlying physical principles that take into account changes in available energy, humidity and wind speed, suggest that there has been little change in drought over the past 60 years. The results have implications for how we interpret the impact of global warming on the hydrological cycle and its extremes, and may help to explain why palaeoclimate drought reconstructions based on tree-ring data diverge from the PDSI-based drought record in recent years.

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Crossref · 10.1038/nature11575

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  1. Gupta, S. K., Stackhouse, P. W., Cox, S. J., Mikovitz, J. C. & Zhang, T. Surface Radiation Budget Project completes 22-year data set. GEWEX News 16, 12–13 (2006)

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Metadata

Authors
Sheffield, J., Wood, E. F., & Roderick, M. L.
Affiliations
  • Princeton University (US)
  • Australian National University (AU)
Corresponding author
Sheffield, Justin
Venue
Nature
Published
2012-11
Volume
491
Issue
7424
Pages
435-438
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2015522309
Cited by
1,978
References
50
Citations by year
2026: 97 · 2025: 126 · 2024: 131 · 2023: 162 · 2022: 188 · 2021: 196 · 2020: 174 · 2019: 159 · 2018: 160 · 2017: 139 · 2016: 144 · 2015: 121 · 2014: 110 · 2013: 66 · 2012: 3
FWCI
79.51
Type
journal article
Language
en
Open access
closed
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • ePrints Soton (University of Southampton) (submittedVersion)
  • ANU Open Research (Australian National University) (submittedVersion)
Topics
  • Physical Sciences › Environmental Science › Global and Planetary Change › Hydrology and Drought Analysis
  • Physical Sciences › Environmental Science › Global and Planetary Change › Plant Water Relations and Carbon Dynamics
  • Physical Sciences › Environmental Science › Global and Planetary Change › Climate variability and models
Keywords
global drought, Palmer Drought Severity Index, drought trends, potential evaporation, global warming, water cycle, drought indices, climate change impacts, water balance modeling
MeSH terms
Models, Theoretical, Temperature, Time Factors, Droughts, Global Warming

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