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Improvements in WRF simulation skills of southeastern United States summer rainfall: physical parameterization and horizontal resolution

dc.contributor.author Li, L
dc.contributor.author Li, W
dc.contributor.author Jin, J
dc.date.accessioned 2015-04-08T20:54:51Z
dc.date.issued 2014-01-06
dc.identifier.issn 0930-7575
dc.identifier.uri https://hdl.handle.net/10161/9571
dc.description.abstract Realistic regional climate simulations are important in understanding the mechanisms of summer rainfall in the southeastern United States (SE US) and in making seasonal predictions. In this study, skills of SE US summer rainfall simulation at a 15-km resolution are evaluated using the weather research and forecasting (WRF) model driven by climate forecast system reanalysis data. Influences of parameterization schemes and model resolution on the rainfall are investigated. It is shown that the WRF simulations for SE US summer rainfall are most sensitive to cumulus schemes, moderately sensitive to planetary boundary layer schemes, and less sensitive to microphysics schemes. Among five WRF cumulus schemes analyzed in this study, the Zhang-McFarlane scheme outperforms the other four. Further analysis suggests that the superior performance of the Zhang-McFarlane scheme is attributable primarily to its capability of representing rainfall-triggering processes over the SE US, especially the positive relationship between convective available potential energy and rainfall. In addition, simulated rainfall using the Zhang-McFarlane scheme at the 15-km resolution is compared with that at a 3-km convection-permitting resolution without cumulus scheme to test whether the increased horizontal resolution can further improve the SE US rainfall simulation. Results indicate that the simulations at the 3-km resolution do not show obvious advantages over those at the 15-km resolution with the Zhang-McFarlane scheme. In conclusion, our study suggests that in order to obtain a satisfactory simulation of SE US summer rainfall, choosing a cumulus scheme that can realistically represent the convective rainfall triggering mechanism may be more effective than solely increasing model resolution. © 2014 Springer-Verlag Berlin Heidelberg.
dc.publisher Springer Science and Business Media LLC
dc.relation.ispartof Climate Dynamics
dc.relation.isversionof 10.1007/s00382-013-2031-2
dc.title Improvements in WRF simulation skills of southeastern United States summer rainfall: physical parameterization and horizontal resolution
dc.type Journal article
duke.contributor.id Li, W|0495364
pubs.begin-page 1
pubs.end-page 15
pubs.organisational-group Civil and Environmental Engineering
pubs.organisational-group Duke
pubs.organisational-group Earth and Ocean Sciences
pubs.organisational-group Nicholas School of the Environment
pubs.organisational-group Pratt School of Engineering
pubs.publication-status Accepted
dc.identifier.eissn 1432-0894
duke.contributor.orcid Li, W|0000-0002-5990-2004


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