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Title: A multimodel intercomparison of resolution effects on precipitation: simulations and theory

An ensemble of six pairs of RCM experiments performed at 25 and 50 km for the period 1961–2000 over a large European domain is examined in order to evaluate the effects of resolution on the simulation of daily precipitation statistics. Application of the non-parametric two-sample Kolmorgorov–Smirnov test, which tests for differences in the location and shape of the probability distributions of two samples, shows that the distribution of daily precipitation differs between the pairs of simulations over most land areas in both summer and winter, with the strongest signal over southern Europe. Two-dimensional histograms reveal that precipitation intensity increases with resolution over almost the entire domain in both winter and summer. In addition, the 25 km simulations have more dry days than the 50 km simulations. The increase in dry days with resolution is indicative of an improvement in model performance at higher resolution, while the more intense precipitation exceeds observed values. The systematic increase in precipitation extremes with resolution across all models suggests that this response is fundamental to model formulation. Simple theoretical arguments suggest that fluid continuity, combined with the emergent scaling properties of the horizontal wind field, results in an increase in resolved vertical transport as grid spacing decreases.more » This increase in resolution-dependent vertical mass flux then drives an intensification of convergence and resolvable-scale precipitation as grid spacing decreases. In conclusion, this theoretical result could help explain the increasingly, and often anomalously, large stratiform contribution to total rainfall observed with increasing resolution in many regional and global models.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [5] ;  [1]
  1. Univ. of Delaware, Newark, DE (United States). Dept. of Geography
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth Sciences Division
  3. American Univ. of Paris, Paris (France). Dept. of Computer Science, Mathematics and Environmental Science
  4. International Centre for Theoretical Physics, Trieste (Italy). Earth System Physics Section
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Earth and Planetary Sciences
Publication Date:
Grant/Contract Number:
AC02-05CH11231; 036946; GOCE-CT-2003-505539
Type:
Accepted Manuscript
Journal Name:
Climate Dynamics
Additional Journal Information:
Journal Volume: 47; Journal Issue: 7-8; Journal ID: ISSN 0930-7575
Publisher:
Springer-Verlag
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Regional climate modeling; Precipitation; Model resolution
OSTI Identifier:
1435071

Rauscher, Sara A., O?Brien, Travis A., Piani, Claudio, Coppola, Erika, Giorgi, Filippo, Collins, William D., and Lawston, Patricia M.. A multimodel intercomparison of resolution effects on precipitation: simulations and theory. United States: N. p., Web. doi:10.1007/s00382-015-2959-5.
Rauscher, Sara A., O?Brien, Travis A., Piani, Claudio, Coppola, Erika, Giorgi, Filippo, Collins, William D., & Lawston, Patricia M.. A multimodel intercomparison of resolution effects on precipitation: simulations and theory. United States. doi:10.1007/s00382-015-2959-5.
Rauscher, Sara A., O?Brien, Travis A., Piani, Claudio, Coppola, Erika, Giorgi, Filippo, Collins, William D., and Lawston, Patricia M.. 2016. "A multimodel intercomparison of resolution effects on precipitation: simulations and theory". United States. doi:10.1007/s00382-015-2959-5. https://www.osti.gov/servlets/purl/1435071.
@article{osti_1435071,
title = {A multimodel intercomparison of resolution effects on precipitation: simulations and theory},
author = {Rauscher, Sara A. and O?Brien, Travis A. and Piani, Claudio and Coppola, Erika and Giorgi, Filippo and Collins, William D. and Lawston, Patricia M.},
abstractNote = {An ensemble of six pairs of RCM experiments performed at 25 and 50 km for the period 1961–2000 over a large European domain is examined in order to evaluate the effects of resolution on the simulation of daily precipitation statistics. Application of the non-parametric two-sample Kolmorgorov–Smirnov test, which tests for differences in the location and shape of the probability distributions of two samples, shows that the distribution of daily precipitation differs between the pairs of simulations over most land areas in both summer and winter, with the strongest signal over southern Europe. Two-dimensional histograms reveal that precipitation intensity increases with resolution over almost the entire domain in both winter and summer. In addition, the 25 km simulations have more dry days than the 50 km simulations. The increase in dry days with resolution is indicative of an improvement in model performance at higher resolution, while the more intense precipitation exceeds observed values. The systematic increase in precipitation extremes with resolution across all models suggests that this response is fundamental to model formulation. Simple theoretical arguments suggest that fluid continuity, combined with the emergent scaling properties of the horizontal wind field, results in an increase in resolved vertical transport as grid spacing decreases. This increase in resolution-dependent vertical mass flux then drives an intensification of convergence and resolvable-scale precipitation as grid spacing decreases. In conclusion, this theoretical result could help explain the increasingly, and often anomalously, large stratiform contribution to total rainfall observed with increasing resolution in many regional and global models.},
doi = {10.1007/s00382-015-2959-5},
journal = {Climate Dynamics},
number = 7-8,
volume = 47,
place = {United States},
year = {2016},
month = {2}
}