Abstract
The weather research and forecast (WRF) model downscaling skill in extreme maximum daily temperature is evaluated by using the generalized extreme value (GEV) distribution. While the GEV distribution has been used extensively in climatology and meteorology for estimating probabilities of extreme events, accurately estimating GEV parameters based on data from a single pixel can be difficult, even with fairly long data records. This work proposes a simple method assuming that the shape parameter, the most difficult of the three parameters to estimate, does not vary over a relatively large region. This approach is applied to evaluate 31-year WRF-downscaled extreme maximum temperature through comparison with North American regional reanalysis (NARR) data. Uncertainty in GEV parameter estimates and the statistical significance in the differences of estimates between WRF and NARR are accounted for by conducting a novel bootstrap procedure that makes no assumption of temporal or spatial independence within a year, which is especially important for climate data. Despite certain biases over parts of the United States, overall, WRF shows good agreement with NARR in the spatial pattern and magnitudes of GEV parameter estimates. Both WRF and NARR show a significant increase in extreme maximum temperature over the southern Great Plains and southeastern United States in January and over the western United States in July. The GEV model shows clear benefits from the regionally constant shape parameter assumption, for example, leading to estimates of the location and scale parameters of the model that show coherent spatial patterns.
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Acknowledgments
We thank all anonymous reviewers for their constructive comments and insights. This work was supported under a military interdepartmental purchase request from the Strategic Environmental Research and Development Program, RC-2242, through U.S. Department of Energy (DOE) Contract DE-AC02-06CH11357. The North American Regional Reanalysis (NARR) 3-hour surface air temperature data is downloaded from ftp.cdc.noaa.gov/Datasets/. The computational resources for the WRF simulations were provided by the DOE-supported Argonne Leadership Computing Facility and the National Energy Research Scientific Computing Center (NERSC, contract No. DE-AC02-05CH11231).
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The submitted manuscript has been created by UChicago Argonne, LLC, Operator of Argonne National Laboratory (“Argonne”). Argonne, a U.S. Department of Energy Office of Science laboratory, is operated under Contract No. DE-AC02-06CH11357. The U.S. government retains for itself, and others acting on its behalf, a paid-up, nonexclusive, irrevocable worldwide license in said article to reproduce, prepare derivative works, distribute copies to the public, and perform publicly and display publicly, by or on behalf of the Government.
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Wang, J., Han, Y., Stein, M.L. et al. Evaluation of dynamically downscaled extreme temperature using a spatially-aggregated generalized extreme value (GEV) model. Clim Dyn 47, 2833–2849 (2016). https://doi.org/10.1007/s00382-016-3000-3
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DOI: https://doi.org/10.1007/s00382-016-3000-3