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Title: Assessment of future changes in water availability and aridity

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1002/2015gl064127· OSTI ID:1354885
 [1];  [2]
  1. Federal Inst. of Technology, Zurich (Switzerland). Inst. for Atmospheric and Climate Science; Federal Inst. of Technology, Zurich (Switzerland). Center for Climate Systems Modeling (C2SM)
  2. Federal Inst. of Technology, Zurich (Switzerland). Inst. for Atmospheric and Climate Science

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.

Research Organization:
Federal Inst. of Technology, Zurich (Switzerland); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States). Climate Model Diagnosis and Intercomparison Program
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344; CH2-01 11-1
OSTI ID:
1354885
Journal Information:
Geophysical Research Letters, Vol. 42, Issue 13; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 121 works
Citation information provided by
Web of Science

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Cited By (33)

Climate Change and Drought: the Soil Moisture Perspective journal April 2018
The aridity Index under global warming journal November 2019
Selenium deficiency risk predicted to increase under future climate change journal February 2017
Arid/humid patterns over Asia in response to national-committed emission reductions under the Paris agreement journal March 2020
Critical impact of vegetation physiology on the continental hydrologic cycle in response to increasing CO 2 journal April 2018
Global assessment of water challenges under uncertainty in water scarcity projections journal September 2018
Robust drying and wetting trends found in regions over China based on Köppen climate classifications: China Drying and Wetting Changes journal April 2017
Impact of climate model resolution on soil moisture projections in central-western Europe journal January 2019
Sensitivity of arid/humid patterns in China to future climate change under a high-emissions scenario journal January 2019
Regional scaling of annual mean precipitation and water availability with global temperature change journal January 2018
A Precipitation Recycling Network to Assess Freshwater Vulnerability: Challenging the Watershed Convention journal November 2019
The mechanisms behind changes in the seasonality of global precipitation found in reanalysis products and CMIP5 simulations journal April 2019
Simulated changes in aridity from the last glacial maximum to 4xCO 2 journal November 2017
A simple tool for refining GCM water availability projections, applied to Chinese catchments journal January 2018
Terrestrial contribution to the heterogeneity in hydrological changes under global warming: TERRESTRIAL HYDROLOGICAL SENSITIVITY journal April 2016
Future hydroclimatological changes in South America based on an ensemble of regional climate models journal May 2018
Sensitivity of Potential Groundwater Recharge to Projected Climate Change Scenarios: A Site-Specific Study in the Nebraska Sand Hills, USA journal May 2019
A New Perspective on Terrestrial Hydrologic Intensity That Incorporates Atmospheric Water Demand journal July 2019
Changes in regional climate extremes as a function of global mean temperature: an interactive plotting framework journal January 2017
Changes in climate extremes over West and Central Africa at 1.5 °C and 2 °C global warming journal June 2018
Crop productivity changes in 1.5 °C and 2 °C worlds under climate sensitivity uncertainty journal May 2018
Unraveling the influence of atmospheric evaporative demand on drought and its response to climate change journal December 2019
Seasonally varying footprint of climate change on precipitation in the Middle East journal March 2018
Assessment of multi-model climate projections of water resources over South America CORDEX domain journal September 2019
Land–atmosphere feedbacks amplify aridity increase over land under global warming journal May 2016
Regional scaling of annual mean precipitation and water availability with global temperature change text January 2018
Crop productivity changes in 1.5 °C and 2 °C worlds under climate sensitivity uncertainty text January 2018
Changes in regional climate extremes as a function of global mean temperature: An interactive plotting framework text January 2017
Observational Constraints Reduce Likelihood of Extreme Changes in Multidecadal Land Water Availability text January 2019
Crop productivity changes in 1.5 °C and 2 °C worlds under climate sensitivity uncertainty text January 2018
Critical impact of vegetation physiology on the continental hydrologic cycle in response to increasing CO2 text January 2018
Crop productivity changes in 1.5 °C and 2 °C worlds under climate sensitivity uncertainty text January 2018
A simple tool for refining GCM water availability projections, applied to Chinese catchments posted_content April 2018

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