Assessment of future changes in water availability and aridity
Abstract
Substantial changes in the hydrological cycle are projected for the 21st century, but these projections are subject to major uncertainties. In this context, the “dry gets drier, wet gets wetter” (DDWW) paradigm is often used as a simplifying summary. However, recent studies cast doubt on the validity of the paradigm and also on applying the widely used P-E (precipitation - evapotranspiration) metric over global land surfaces. Here we show in a comprehensive CMIP5-based assessment that projected changes in mean annual P - E are generally not significant, except for high-latitude regions showing wetting conditions until the end of the 21st century. Significant increases in aridity do occur in many subtropical and also adjacent humid regions. However, combining both metrics still shows that approximately 70% of all land area will not experience significant changes. Finally, based on these findings, we conclude that the DDWW paradigm is generally not confirmed for projected changes in most land areas.
- Authors:
-
- Federal Inst. of Technology, Zurich (Switzerland). Inst. for Atmospheric and Climate Science; Federal Inst. of Technology, Zurich (Switzerland). Center for Climate Systems Modeling (C2SM)
- Federal Inst. of Technology, Zurich (Switzerland). Inst. for Atmospheric and Climate Science
- Publication Date:
- Research Org.:
- Federal Inst. of Technology, Zurich (Switzerland); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States). Climate Model Diagnosis and Intercomparison Program
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1354885
- Grant/Contract Number:
- AC52-07NA27344; CH2-01 11-1
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Geophysical Research Letters
- Additional Journal Information:
- Journal Volume: 42; Journal Issue: 13; Journal ID: ISSN 0094-8276
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES
Citation Formats
Greve, P., and Seneviratne, S. I. Assessment of future changes in water availability and aridity. United States: N. p., 2015.
Web. doi:10.1002/2015gl064127.
Greve, P., & Seneviratne, S. I. Assessment of future changes in water availability and aridity. United States. https://doi.org/10.1002/2015gl064127
Greve, P., and Seneviratne, S. I. Sat .
"Assessment of future changes in water availability and aridity". United States. https://doi.org/10.1002/2015gl064127. https://www.osti.gov/servlets/purl/1354885.
@article{osti_1354885,
title = {Assessment of future changes in water availability and aridity},
author = {Greve, P. and Seneviratne, S. I.},
abstractNote = {Substantial changes in the hydrological cycle are projected for the 21st century, but these projections are subject to major uncertainties. In this context, the “dry gets drier, wet gets wetter” (DDWW) paradigm is often used as a simplifying summary. However, recent studies cast doubt on the validity of the paradigm and also on applying the widely used P-E (precipitation - evapotranspiration) metric over global land surfaces. Here we show in a comprehensive CMIP5-based assessment that projected changes in mean annual P - E are generally not significant, except for high-latitude regions showing wetting conditions until the end of the 21st century. Significant increases in aridity do occur in many subtropical and also adjacent humid regions. However, combining both metrics still shows that approximately 70% of all land area will not experience significant changes. Finally, based on these findings, we conclude that the DDWW paradigm is generally not confirmed for projected changes in most land areas.},
doi = {10.1002/2015gl064127},
journal = {Geophysical Research Letters},
number = 13,
volume = 42,
place = {United States},
year = {Sat Jul 04 00:00:00 EDT 2015},
month = {Sat Jul 04 00:00:00 EDT 2015}
}
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