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Article
WRF winter extreme daily precipitation over the North American CORDEX Arctic
Journal of Geophysical Research: Atmospheres
  • Justin M. Glisan, Iowa State University
  • William J. Gutowski, Jr., Iowa State University
Document Type
Article
Disciplines
Publication Version
Published Version
Publication Date
9-27-2014
DOI
10.1002/2014JD021676
Abstract
We analyze daily extremes of precipitation produced by a six-member ensemble of Pan-Arctic Weather Research and Forecasting that simulated 19 years on the Coordinated Regional Downscaling Experiment Arctic domain. Analysis focuses on four North American regions defined using climatological records, regional weather patterns, and geographical/topographical features. We compare simulated extremes for the winter season with those occurring at corresponding observing stations in the U.S. National Climate Data Center's Global Summary of the Day. We define winter as the 3 month period leading up to and including the climatological sea ice maximum: January-February-March (JFM). Our analysis focuses on winter variations in features of extremes such as magnitudes, spatial scales, and temporal regimes. Using composites of extreme events, we also analyze the processes producing winter season extremes. We compare circulation, pressure, temperature, and humidity fields from the ERA-Interim reanalysis and the model output. Although the model produces lower amounts of extreme precipitation compared to observation, the model is simulating the physical forcing that is found during observed extreme events. Specifically, the model and reanalysis highlight the importance of low-level moisture advection and its interaction with topography. The analysis establishes the physical credibility of the simulations for extreme precipitation events in JFM and their associated atmospheric circulations, laying a foundation for examining projected changes in extreme precipitation.
Comments

This article is from Journal of Geophysical Research: Atmospheres 119 (2014): 10738–10748, doi:10.1002/2014JD021676. Posted with permission.

Copyright Owner
American Geophysical Union
Language
en
File Format
application/pdf
Citation Information
Justin M. Glisan and William J. Gutowski. "WRF winter extreme daily precipitation over the North American CORDEX Arctic" Journal of Geophysical Research: Atmospheres Vol. 119 Iss. 18 (2014) p. 10738 - 10748
Available at: http://works.bepress.com/william-gutowski/22/