Evaluation of Surface Fluxes in the WRF Model: Case Study for Irrigated Farmland in Rolling Terrain

ORAL

Abstract

Surface fluxes, serving as sinks or sources of atmospheric pollutants, are crucial parameters in numerical weather prediction models.The Weather Research and Forecasting Model (WRF), version 3.7.1, is used to simulate surface fluxes near Echo, Oregon, in September2014. Flux tower observations, from 22 to 28 September , provide the evaluation dataset for the model assessment.Atmospheric turbulence data were measured at 10 Hz using a 3D sonic anemometer and surface fluxes were calculated by eddy-covariance technique. The PBL schemes in WRF differ in assumptions of the transport of energy, mass, and moisture.To get the optimal model options with satisfactory evaluation performance, a series of simulations are conducted based on different combinations of PBL schemes, land surface models, and large- scale datasets for boundary conditions.To evaluate the WRF performance on surface flux simulations under varying sets of schemes, the bias, correlation coefficient, and root-mean-square error between the observation and simulation data is compared among these cases. This study assesses the ability of WRF to simulate surface fluxes and determine the sensitivity to different PBL and land surface schemes.

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Authors

  • Xia Sun

    University of Nevada, Reno

  • Ethan Anderes

    UC Davis, Lawrence Berkeley National Lab - ALS, National Institute of Standards and Technology - NCNR, Univ of California - Davis, University of California, Davis, California State University, Long Beach, University of California, Irvine, University of California, Merced, UC Merced, U Central Florida, Paul Scherrer Institute, Paul Scherrer Institute in Switzerland, Hartnell Comm Coll, University of Michigan, University of Nevada, Reno, National Security Technologies LLC, Livermore, California, Humboldt State University, Stanford University, San Diego State Univ, Institute of Mathematical Problems of Biology, Eindhoven University of Technology, University Of Nevada Reno, Univ of Nevada - Reno, University of Chicago, Physics Department of the University of Nevada, Reno, NV, USA, Institute for Academic Initiatives, PPC and Graduate School of Engineering, Osaka University, Joint Institute for High Temperatures, PPC and Graduate School of Engineering, Osaka University, Institute for Academic Initiatives, Joint Institute for High Temperatures, National Institute of Standards and Technology, Gaithersburg, MD, Department of Physics, UC Davis, Department of Physics & Astronomy, Univeristy of California Irvine, 92697, Department of Chemistry and of Physics, Univeristy of California Irvine, 92697, Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, Israel 76100, Einstein Centre for Local-Realistic Physics, Cal State Long Beach, University of nevada, Reno, Nicolaus Copernicus University, Torun, Poland, University of Maryland, CERN, Univ of California, Davis