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Hydrological Processes in Regional Climate Model Simulations of the Central United States Flood of June–July 1993
Journal of Hydrometeorology
  • Christopher J. Anderson, Iowa State University
  • Raymond W. Arritt, Iowa State University
  • Zaitao Pan, Iowa State University
  • Eugene S. Takle, Iowa State University
  • William J. Gutowski, Jr., Iowa State University
  • Francis O. Otieno, Iowa State University
  • Renato da Silva, Duke University
  • Daniel Caya, Université du Québec á Montréal
  • Jens H. Christensen, Danish Meteorological Institute
  • Daniel Lüthi, Swiss Federal Institute of Technology
  • Miguel A. Gaertner, Universidad de Castilla–La Mancha
  • Clemente Gallardo, Universidad de Castilla–La Mancha
  • Filippo Giorgi, International Center for Theoretical Physics
  • René Laprise, International Center for Theoretical Physics
  • Soung-You Hong, Yonsei University
  • Colin Jones, Swedish Meteorological and Hydrological Institute
  • H.-M. H. Juang, National Centers for Environmental Prediction
  • J. J. Katzfey, Commonwealth Scientific and Industrial Research Organisation
  • John L. McGregor, Commonwealth Scientific and Industrial Research Organisation
  • William M. Lapenta, Marshall Space Flight Center
  • Jay W. Larson, Argonne National Laboratory
  • John A. Taylor, Argonne National Laboratory
  • Glen E. Liston, Colorado State University
  • Roger A. Pielke, Sr., Colorado State University
  • John Roads, University of California, San Diego
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Thirteen regional climate model (RCM) simulations of June–July 1993 were compared with each other and observations. Water vapor conservation and precipitation characteristics in each RCM were examined for a 10° × 10° subregion of the upper Mississippi River basin, containing the region of maximum 60-day accumulated precipitation in all RCMs and station reports. All RCMs produced positive precipitation minus evapotranspiration (P − E > 0), though most RCMs produced P − Ebelow the observed range. RCM recycling ratios were within the range estimated from observations. No evidence of common errors of E was found. In contrast, common dry bias of P was found in the simulations. Daily cycles of terms in the water vapor conservation equation were qualitatively similar in most RCMs. Nocturnal maximums of P and C (convergence) occurred in 9 of 13 RCMs, consistent with observations. Three of the four driest simulations failed to couple P and C overnight, producing afternoon maximum P. Further, dry simulations tended to produce a larger fraction of their 60-day accumulated precipitation from low 3-h totals. In station reports, accumulation from high (low) 3-h totals had a nocturnal (early morning) maximum. This time lag occurred, in part, because many mesoscale convective systems had reached peak intensity overnight and had declined in intensity by early morning. None of the RCMs contained such a time lag. It is recommended that short-period experiments be performed to examine the ability of RCMs to simulate mesoscale convective systems prior to generating long-period simulations for hydroclimatology.

This article is from J. Hydrometeor, 4, 584–598. doi:<0584:HPIRCM>2.0.CO;2. Posted with permission.

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American Meteorological Society
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Christopher J. Anderson, Raymond W. Arritt, Zaitao Pan, Eugene S. Takle, et al.. "Hydrological Processes in Regional Climate Model Simulations of the Central United States Flood of June–July 1993" Journal of Hydrometeorology Vol. 4 Iss. 3 (2003) p. 584 - 598
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