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Precipitation trends determine future occurrences of compound hot–dry events

Journal Article · · Nature Climate Change
 [1];  [2];  [3];  [4]
  1. Helmholtz Centre for Environmental Research, Leipzig (Germany); OSTI
  2. National Research Council of Italy, Institute of Atmospheric Sciences and Climate (CNR-ISAC), Bologna (Italy)
  3. Cornell University, Ithaca, NY (United States); National Center for Atmospheric Research (NCAR), Boulder, CO (United States)
  4. Helmholtz Centre for Environmental Research, Leipzig (Germany); University of Bern (Switzerland)

Compound hot–dry events—co-occurring hot and dry extremes—frequently cause damages to human and natural systems, often exceeding separate impacts from heatwaves and droughts. Strong increases in the occurrence of these events are projected with warming, but associated uncertainties remain large and poorly understood. Here, using climate model large ensembles, we show that mean precipitation trends exclusively modulate the future occurrence of compound hot–dry events over land. This occurs because local warming will be large enough that future droughts will always coincide with at least moderately hot extremes, even in a 2°C warmer world. By contrast, precipitation trends are often weak and equivocal in sign, depending on the model, region and internal climate variability. Therefore, constraining regional precipitation trends will also constrain future compound hot–dry events. These results help to assess future frequencies of other compound extremes characterized by strongly different trends in the drivers.

Research Organization:
University Corporation for Atmospheric Research, Boulder, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); European Union’s Horizon 2020; ERA4CS-MEDSCOPE; Swiss National Science Foundation; Helmholtz Initiative and Networking Fund; National Science Foundation (NSF)
Grant/Contract Number:
FC02-97ER62402
OSTI ID:
1978628
Journal Information:
Nature Climate Change, Journal Name: Nature Climate Change Journal Issue: 4 Vol. 12; ISSN 1758-678X
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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