Clustering of observed diurnal cycles of precipitation over the United States for evaluation of a WRF multi-physics regional climate ensemble

Clustering of observed diurnal cycles of precipitation over the United States for evaluation of a... AbstractThe diurnal cycle of precipitation during the summer season over the contiguous United States is examined in eight distinct regions. These were identified using cluster analysis applied to the diurnal cycle characteristics at 2141 rainfall gauges over the ten-year period (1990-2000). Application of the clustering technique provides a physically meaningful way of identifying regions for comparison of model results with observations. The diurnal cycle for each region is specified in terms of (i) total precipitation, (ii) frequency of precipitation occurrence, and (iii) intensity of precipitation per occurrence on an hourly basis averaged over the ten-year period. The amplitude and phase of each element of the diurnal cycle was obtained from harmonic analysis and has been compared with the results of a 24-member multiphysics ensemble of simulations produced by the Weather Research and Forecast (WRF) model on a region-by-region basis. Three cumulus schemes, two radiation schemes, two microphysics schemes and two planetary boundary layer schemes were included in the ensemble. Simulations of total precipitation showed reasonable agreement with observations in regions where the diurnal cycle is directly influenced by solar radiation, e.g., the Southeast, but they were less successful in regions where other factors influence the diurnal cycle, e.g., the central United States. The diurnal cycle of precipitation frequency and intensity showed substantial biases in the simulations of all eight regions, namely overestimation of occurrences and underestimation of intensities. Simulations were sensitive to the cumulus and radiation schemes but were largely insensitive to either microphysics or planetary boundary layer schemes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Climate American Meteorological Society

Clustering of observed diurnal cycles of precipitation over the United States for evaluation of a WRF multi-physics regional climate ensemble

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Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1520-0442
D.O.I.
10.1175/JCLI-D-16-0851.1
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Abstract

AbstractThe diurnal cycle of precipitation during the summer season over the contiguous United States is examined in eight distinct regions. These were identified using cluster analysis applied to the diurnal cycle characteristics at 2141 rainfall gauges over the ten-year period (1990-2000). Application of the clustering technique provides a physically meaningful way of identifying regions for comparison of model results with observations. The diurnal cycle for each region is specified in terms of (i) total precipitation, (ii) frequency of precipitation occurrence, and (iii) intensity of precipitation per occurrence on an hourly basis averaged over the ten-year period. The amplitude and phase of each element of the diurnal cycle was obtained from harmonic analysis and has been compared with the results of a 24-member multiphysics ensemble of simulations produced by the Weather Research and Forecast (WRF) model on a region-by-region basis. Three cumulus schemes, two radiation schemes, two microphysics schemes and two planetary boundary layer schemes were included in the ensemble. Simulations of total precipitation showed reasonable agreement with observations in regions where the diurnal cycle is directly influenced by solar radiation, e.g., the Southeast, but they were less successful in regions where other factors influence the diurnal cycle, e.g., the central United States. The diurnal cycle of precipitation frequency and intensity showed substantial biases in the simulations of all eight regions, namely overestimation of occurrences and underestimation of intensities. Simulations were sensitive to the cumulus and radiation schemes but were largely insensitive to either microphysics or planetary boundary layer schemes.

Journal

Journal of Climate – American Meteorological Society

Published: Aug 23, 2017

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