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Title: Diagnosing added value of convection-permitting regional models using precipitation event identification and tracking

Abstract

Dynamical downscaling with high-resolution regional climate models may offer the possibility of realistically reproducing precipitation and weather events in climate simulations. As resolutions fall to order kilometers, the use of explicit rather than parametrized convection may offer even greater fidelity. However, these increased resolutions both allow and require increasingly complex diagnostics for evaluating model fidelity. In this study we focus on precipitation evaluation and analyze five 2-month-long dynamically downscaled model runs over the continental United States that employ different convective and microphysics parameterizations, including one high-resolution convection-permitting simulation. All model runs use the Weather Research and Forecasting Model driven by National Center for Environmental Prediction reanalysis data. We show that employing a novel rainstorm identification and tracking algorithm that allocates essentially all rainfall to individual precipitation events (Chang et al. in J Clim 29(23):8355–8376, 2016) allows new insights into model biases. Results include that, at least in these runs, model wet bias is driven by excessive areal extent of individual precipitating events, and that the effect is time-dependent, producing excessive diurnal cycle amplitude. This amplified cycle is driven not by new production of events but by excessive daytime enlargement of long-lived precipitation events. We further show that in the domainmore » average, precipitation biases appear best represented as additive offsets. Of all model configurations evaluated, convection-permitting simulations most consistently reduced biases in precipitation event characteristics« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Science Foundation (NSF)
OSTI Identifier:
1569848
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Climate Dynamics
Additional Journal Information:
Journal Volume: 51
Country of Publication:
United States
Language:
English
Subject:
Convection Permitting Simulation; Parameterization; Precipitation; Rainstorm Tracking

Citation Formats

Chang, Won, Wang, Jiali, Marohnic, Julian, Kotamarthi, V. Rao, and Moyer, Elisabeth J. Diagnosing added value of convection-permitting regional models using precipitation event identification and tracking. United States: N. p., 2018. Web. doi:10.1007/s00382-018-4294-0.
Chang, Won, Wang, Jiali, Marohnic, Julian, Kotamarthi, V. Rao, & Moyer, Elisabeth J. Diagnosing added value of convection-permitting regional models using precipitation event identification and tracking. United States. doi:10.1007/s00382-018-4294-0.
Chang, Won, Wang, Jiali, Marohnic, Julian, Kotamarthi, V. Rao, and Moyer, Elisabeth J. Wed . "Diagnosing added value of convection-permitting regional models using precipitation event identification and tracking". United States. doi:10.1007/s00382-018-4294-0.
@article{osti_1569848,
title = {Diagnosing added value of convection-permitting regional models using precipitation event identification and tracking},
author = {Chang, Won and Wang, Jiali and Marohnic, Julian and Kotamarthi, V. Rao and Moyer, Elisabeth J.},
abstractNote = {Dynamical downscaling with high-resolution regional climate models may offer the possibility of realistically reproducing precipitation and weather events in climate simulations. As resolutions fall to order kilometers, the use of explicit rather than parametrized convection may offer even greater fidelity. However, these increased resolutions both allow and require increasingly complex diagnostics for evaluating model fidelity. In this study we focus on precipitation evaluation and analyze five 2-month-long dynamically downscaled model runs over the continental United States that employ different convective and microphysics parameterizations, including one high-resolution convection-permitting simulation. All model runs use the Weather Research and Forecasting Model driven by National Center for Environmental Prediction reanalysis data. We show that employing a novel rainstorm identification and tracking algorithm that allocates essentially all rainfall to individual precipitation events (Chang et al. in J Clim 29(23):8355–8376, 2016) allows new insights into model biases. Results include that, at least in these runs, model wet bias is driven by excessive areal extent of individual precipitating events, and that the effect is time-dependent, producing excessive diurnal cycle amplitude. This amplified cycle is driven not by new production of events but by excessive daytime enlargement of long-lived precipitation events. We further show that in the domain average, precipitation biases appear best represented as additive offsets. Of all model configurations evaluated, convection-permitting simulations most consistently reduced biases in precipitation event characteristics},
doi = {10.1007/s00382-018-4294-0},
journal = {Climate Dynamics},
number = ,
volume = 51,
place = {United States},
year = {2018},
month = {7}
}

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