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Title: Projected drought risk in 1.5°C and 2°C warmer climates

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1002/2017GL074117· OSTI ID:1473891

The large socioeconomic costs of droughts make them a crucial target for impact assessments of climate change scenarios. Using multiple drought metrics and a set of simulations with the Community Earth System Model targeting 1.5°C and 2°C above preindustrial global mean temperatures, we investigate changes in aridity and the risk of consecutive drought years. If warming is limited to 2°C, these simulations suggest little change in drought risk for the U.S. Southwest and Central Plains compared to present day. In the Mediterranean and central Europe, however, drought risk increases significantly for both 1.5°C and 2°C warming targets, and the additional 0.5°C of the 2°C climate leads to significantly higher drought risk. Our study suggests that limiting anthropogenic warming to 1.5°C rather than 2°C, as aspired to by the Paris Climate Agreement, may have benefits for future drought risk but that such benefits may be regional and in some cases highly uncertain.

Research Organization:
National Center for Atmospheric Research (NCAR), Boulder, CO (United States)
Sponsoring Organization:
Office of Science (SC), Biological and Environmental Research (BER). Earth and Environmental Systems Science Division; National Science Foundation (NSF); US Dept. of the Interior (DOI), Bureau of Reclamation (USBR); Swiss National Science Foundation (SNSF)
Contributing Organization:
National Oceanic and Atmospheric Administration (NOAA), Boulder, CO (United States)
Grant/Contract Number:
FC02‐97ER62402; AGS‐1243204; AGS‐1401400; AGS 1243125
OSTI ID:
1473891
Alternate ID(s):
OSTI ID: 1375068
Journal Information:
Geophysical Research Letters, Vol. 44, Issue 14; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 187 works
Citation information provided by
Web of Science

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Encounter Probability and Risk of Flood and Drought under Future Climate Change in the Two Tributaries of the Rao River Basin, China journal December 2019
Global Freshwater Availability Below Normal Conditions and Population Impact Under 1.5 and 2 °C Stabilization Scenarios journal September 2018
Robust changes in tropical rainy season length at 1.5 °C and 2 °C journal June 2018
Potential impacts of specific global warming levels on extreme rainfall events over southern Africa in CORDEX and NEX‐GDDP ensembles journal December 2019
Drylands climate response to transient and stabilized 2 °C and 1.5 °C global warming targets journal June 2019
Increased population exposure to extreme droughts in China due to 0.5 °C of additional warming journal June 2019
A Probabilistic Risk Assessment of the National Economic Impacts of Regulatory Drought Management on Irrigated Agriculture journal February 2019
Distinctive Evolutions of Eurasian Warming and Extreme Events Before and After Global Warming Would Stabilize at 1.5 °C journal February 2019
Global and regional impacts differ between transient and equilibrium warmer worlds journal December 2019
Are the Observed Changes in Heat Extremes Associated With a Half‐Degree Warming Increment Analogues for Future Projections? journal August 2019
Projected increases in magnitude and socioeconomic exposure of global droughts in 1.5 and 2 °C warmer climates journal January 2020
On the need for regional climate information over Africa under varying levels of global warming journal June 2018
Hydrological impacts in La Plata basin under 1.5, 2 and 3 °C global warming above the pre-industrial level journal March 2018
Projected changes in drought characteristics over the Western Cape, South Africa journal July 2019
Power Law Growth and Delayed Feedbacks in Socio‐Hydrological Systems journal November 2019
The relation of climate extremes with global warming in the Mediterranean region and its north versus south contrast journal February 2020
Detectable Impacts of the Past Half‐Degree Global Warming on Summertime Hot Extremes in China journal July 2018
Amplification of risks to water supply at 1.5 °C and 2 °C in drying climates: a case study for Melbourne, Australia journal August 2019
Climate Change and Drought: the Soil Moisture Perspective journal April 2018
Projected changes in climate extremes in China in a 1.5 °C warmer world journal March 2018
South Asian river basins in a 1.5 °C warmer world journal November 2018
Anthropogenic warming exacerbates European soil moisture droughts journal April 2018
Differential Impacts of 1.5 and 2 °C Warming on Extreme Events Over China Using Statistically Downscaled and Bias-Corrected CESM Low-Warming Experiment journal September 2018
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Global drought and severe drought-affected populations in 1.5 and 2 °C warmer worlds journal January 2018
Half a degree and rapid socioeconomic development matter for heatwave risk journal January 2019
The changing water cycle: The eco‐hydrologic impacts of forest density reduction in Mediterranean (seasonally dry) regions journal May 2019
Half‐a‐Degree Matters for Reducing and Delaying Global Land Exposure to Combined Daytime‐Nighttime Hot Extremes journal August 2019
Event-to-event intensification of the hydrologic cycle from 1.5 °C to a 2 °C warmer world journal March 2019
Global implications of 1.5 °C and 2 °C warmer worlds on extreme river flows journal August 2018
European warm-season temperature and hydroclimate since 850 CE journal July 2019
Power Law Growth and Delayed Feedbacks in Socio‐Hydrological Systems text January 2019
Event-to-event intensification of the hydrologic cycle from 1.5 °C to a 2 °C warmer world text January 2019


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