Mass‐Conserving Downscaling of Climate Model Precipitation Over Mountainous Terrain for Water Resource Applications

Details

• Journal Title:
  Geophysical Research Letters
• Personal Author:
  Rugg, A. ; Gutmann, E. D. ; McCrary, R. R. ; Lehner, F. ; Newman, A. J. ; Richter, J. H. ; Tye, M. R. ; Wood, A. W.
• NOAA Program & Office:
  OAR (Oceanic and Atmospheric Research)
• Description:
  A mass‐conserving method to downscale precipitation from global climate models (GCMs) using sub‐grid‐scale topography and modeled 700‐mb wind direction is presented. Runoff is simulated using a stand‐alone hydrological model, with this and several other methods as inputs, and compared to runoff simulated using historical observations over the western contiguous United States. Results suggest the mitigation of grid‐scale biases is more critical than downscaling for some regions with large wet biases (e.g., the Great Basin and Upper Colorado). In other regions (e.g., the Pacific Northwest) the new method produces more realistic sub‐grid‐scale variability in runoff compared to unadjusted GCM output and a simpler downscaling method. The presented method also brings the runoff centroid timing closer to that simulated with observations for all subregions examined.
• Keywords:
  General Earth And Planetary Sciences Geophysics General Earth And Planetary Sciences General Earth And Planetary Sciences
• Source:
  Geophysical Research Letters, 50(20)
• DOI:
  https://doi.org/10.1029/2023gl105326
• ISSN:
  0094-8276 ; 1944-8007
• Format:
  PDF
• Publisher:
  American Geophysical Union (AGU)
• Document Type:
  Journal Article
• Funding:
  Grant no. NA21OAR4310349
• License:
  https://creativecommons.org/licenses/by/4.0/
• Rights Information:
  CC BY
• Compliance:
  Library
• Main Document Checksum:
  urn:sha256:8b57d2f0eb04e4138f50ccd045c7ecc5ee310cd6dda260e7e45ddbb805012cf2
• Download URL:
  https://repository.library.noaa.gov/view/noaa/58335/noaa_58335_DS1.pdf
• File Type:
  [PDF - 2.75 MB ]