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Title: The Shifting Scales of Western U.S. Landfalling Atmospheric Rivers Under Climate Change

Journal Article · · Geophysical Research Letters
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [1]
  1. Climate and Ecosystem Sciences Division Lawrence Berkeley National Laboratory Berkeley CA USA
  2. Department of Land, Air, and Water Resources University of California Davis CA USA
  3. Climate and Ecosystem Sciences Division Lawrence Berkeley National Laboratory Berkeley CA USA, Earth and Atmospheric Sciences Department Indiana University, Bloomington Bloomington IN USA
  4. Climate and Ecosystem Sciences Division Lawrence Berkeley National Laboratory Berkeley CA USA, Department of Geological and Atmospheric Sciences Iowa State University of Science and Technology Ames IA USA
  5. Climate and Ecosystem Sciences Division Lawrence Berkeley National Laboratory Berkeley CA USA, Department of Land, Air, and Water Resources University of California Davis CA USA
  6. Computational Research Division Lawrence Berkeley National Laboratory Berkeley CA USA

Atmospheric rivers (ARs) can be a boon and bane to water resource managers as they have the ability to replenish water reserves, but they can also generate million-to-billion-dollar flood damages. To investigate how anthropogenic climate change may influence AR characteristics in the coastal western United States by end century, we employ a suite of novel tools such as variable resolution in the Community Earth System Model (VR-CESM), the TempestExtremes AR detection algorithm, and the Ralph, Rutz, et al. (2019, https://doi.org/10.1175/BAMS-D-18-0023.1) AR category scale.We show that end-century ARs primarily shift from being “mostly or primarily beneficial” to “mostly or primarily hazardous” with a concomitant sharpening and intensification of winter season precipitation totals. Changes in precipitation totals are due to a significant increase in AR (+260%) rather than non-AR (+7%) precipitation, largely through increases in the most intense category of AR events and a decrease in the interval between landfalling ARs.

Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231; SC0016605
OSTI ID:
1658394
Alternate ID(s):
OSTI ID: 1661612; OSTI ID: 1664607
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 17 Vol. 47; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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