Climatic Change

, Volume 144, Issue 3, pp 519–533 | Cite as

Uncertainties in historical changes and future projections of drought. Part I: estimates of historical drought changes

Article

Abstract

How drought may change in the future are of great concern as global warming continues. In Part I of this study, we examine the uncertainties in estimating recent drought changes. Substantial uncertainties arise in the calculated Palmer Drought Severity Index (PDSI) with Penman-Monteith potential evapotranspiraiton (PDSI_pm) due to different choices of forcing data (especially for precipitation, solar radiation and wind speed) and the calibration period. After detailed analyses, we recommend using the Global Precipitation Climatology Centre (GPCC) or the Global Precipitation Climatology (GPCP) datasets over other existing land precipitation products due to poor data coverage in the other datasets since the 1990s. We also recommend not to include the years after 1980 in the PDSI calibration period to avoid including the anthropogenic climate change as part of the natural variability used for calibration. Consistent with reported declines in pan evaporation, our calculated potential evapotranspiration (PET) shows negative or small trends since 1950 over the United States, China, and other regions, and no global PET trends from 1950 to 1990. Updated precipitation and streamflow data and the self-calibrated PDSI_pm all show consistent drying during 1950–2012 over most Africa, East and South Asia, southern Europe, eastern Australia, and many parts of the Americas. While these regional drying trends resulted primarily from precipitation changes related to multi-decadal oscillations in Pacific sea surface temperatures, rapid surface warming and associated increases in surface vapor pressure deficit since the 1980s have become an increasingly important cause of widespread drying over land.

Keyword

Drought PDSI Precipitation Historical drought change Uncertainties Streamflow 

Supplementary material

10584_2016_1705_MOESM1_ESM.docx (4.8 mb)
ESM 1(DOCX 4.81 mb)

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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  1. 1.Department of Atmospheric and Environmental SciencesUniversity at Albany, SUNYNew YorkUSA
  2. 2.National Center for Atmospheric ResearchBoulderUSA
  3. 3.Key Laboratory of Regional Climate-Environment Research for East Asia, Institute of Atmospheric Physics (IAP)Chinese Academy of Sciences (CAS)BeijingChina

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