Exploring a Variable-Resolution Approach for Simulating Regional Climate in the Rocky Mountain Region Using the VR-CESM

Chenglai Wu, Xiaohong Liu, Zhaohui Lin, Alan M. Rhoades, Paul A. Ullrich, Colin Zarzycki, Zheng Lu, Stefan R. Rahimi-Esfarjani

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The reliability of climate simulations and projections, particularly in the regions with complex terrains, is greatly limited by the model resolution. In this study we evaluate the variable-resolution Community Earth System Model (VR-CESM) with a high-resolution (0.125°) refinement over the Rocky Mountain region. The VR-CESM results are compared with observations, as well as CESM simulation at a quasi-uniform 1° resolution (UNIF) and Canadian Regional Climate Model version 5 (CRCM5) simulation at a 0.11° resolution. We find that VR-CESM is effective at capturing the observed spatial patterns of temperature, precipitation, and snowpack in the Rocky Mountains with the performance comparable to CRCM5, while UNIF is unable to do so. VR-CESM and CRCM5 simulate better the seasonal variations of precipitation than UNIF, although VR-CESM still overestimates winter precipitation whereas CRCM5 and UNIF underestimate it. All simulations distribute more winter precipitation along the windward (west) flanks of mountain ridges with the greatest overestimation in VR-CESM. VR-CESM simulates much greater snow water equivalent peaks than CRCM5 and UNIF, although the peaks are still 10–40% less than observations. Moreover, the frequency of heavy precipitation events (daily precipitation ≥ 25 mm) in VR-CESM and CRCM5 is comparable to observations, whereas the same events in UNIF are an order of magnitude less frequent. In addition, VR-CESM captures the observed occurrence frequency and seasonal variation of rain-on-snow days and performs better than UNIF and CRCM5. These results demonstrate the VR-CESM's capability in regional climate modeling over the mountainous regions and its promising applications for climate change studies.

Original languageEnglish (US)
Pages (from-to)10,939-10,965
JournalJournal of Geophysical Research: Atmospheres
Volume122
Issue number20
DOIs
StatePublished - Oct 27 2017

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Rocky Mountains (North America)
Rocky Mountain region
mountain region
regional climate
Climate models
climate
Earth (planet)
climate models
climate modeling
Snow
snow
seasonal variation
annual variations
winter
snowpack
Climate change
simulation
Rain

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

Wu, Chenglai ; Liu, Xiaohong ; Lin, Zhaohui ; Rhoades, Alan M. ; Ullrich, Paul A. ; Zarzycki, Colin ; Lu, Zheng ; Rahimi-Esfarjani, Stefan R. / Exploring a Variable-Resolution Approach for Simulating Regional Climate in the Rocky Mountain Region Using the VR-CESM. In: Journal of Geophysical Research: Atmospheres. 2017 ; Vol. 122, No. 20. pp. 10,939-10,965.
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Exploring a Variable-Resolution Approach for Simulating Regional Climate in the Rocky Mountain Region Using the VR-CESM. / Wu, Chenglai; Liu, Xiaohong; Lin, Zhaohui; Rhoades, Alan M.; Ullrich, Paul A.; Zarzycki, Colin; Lu, Zheng; Rahimi-Esfarjani, Stefan R.

In: Journal of Geophysical Research: Atmospheres, Vol. 122, No. 20, 27.10.2017, p. 10,939-10,965.

Research output: Contribution to journalArticle

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