The Impact of the Land Surface Physics in the Operational NCEP Eta Model on Simulating the Diurnal Cycle: Evaluation and Testing Using Oklahoma Mesonet Data

Abstract On 31 January 1996, the National Centers for Environmental Prediction/Environmental Modeling Center (NCEP/EMC) implemented a state-of-the-art land surface parameterization in the operational Eta Model. The purpose of this study is to evaluate and test its performance and demonstrate its impacts on the diurnal cycle of the modeled planetary boundary layer (PBL). Operational Eta Model output from summer 1997 are evaluated against the unique observations of near-surface and subsurface fields provided by the Oklahoma Mesonet. The evaluation is partially extended to July 1998 to examine the effects of significant changes that were made to the operational model configuration during the intervening time. Results indicate a severe positive bias in top-layer soil moisture, which was significantly reduced in 1998 by a change in the initialization technique. Net radiation was overestimated, largely because of a positive bias in the downward shortwave component. Also, the ground heat flux was severely undere...

[1]  Michael D. Eilts,et al.  The Oklahoma Mesonet: A Technical Overview , 1995 .

[2]  S. T. Buckland,et al.  An Introduction to the Bootstrap. , 1994 .

[3]  Lech Łobocki,et al.  A Procedure for the Derivation of Surface-Layer Bulk Relationships from Simplified Second-Order Closure Models , 1993 .

[4]  S. Planton,et al.  A Simple Parameterization of Land Surface Processes for Meteorological Models , 1989 .

[5]  G. Gutman,et al.  The derivation of the green vegetation fraction from NOAA/AVHRR data for use in numerical weather prediction models , 1998 .

[6]  Alan K. Betts,et al.  Reply to comment on the paper ‘Non‐precipitating cumulus convection and its parameterization’ , 1974 .

[7]  Z. Janjic The Step-Mountain Eta Coordinate Model: Further Developments of the Convection, Viscous Sublayer, and Turbulence Closure Schemes , 1994 .

[8]  Piers J. Sellers,et al.  Impact of vegetation properties on U.S. summer weather prediction , 1996 .

[9]  A. Betts A new convective adjustment scheme. Part I: Observational and theoretical basis , 1986 .

[10]  S. Zilitinkevich,et al.  Non-local turbulent transport pollution dispersion aspects of coherent structure of convective flows , 1995 .

[11]  Jielun Sun,et al.  Determination of Surface Fluxes from the Surface Radiative Temperature , 1995 .

[12]  Y. Xue,et al.  Modeling of land surface evaporation by four schemes and comparison with FIFE observations , 1996 .

[13]  J. Monteith,et al.  Boundary Layer Climates. , 1979 .

[14]  I. S. Bowen The Ratio of Heat Losses by Conduction and by Evaporation from any Water Surface , 1926 .

[15]  R. Pielke,et al.  Nonlinear Influence of Mesoscale Land Use on Weather and Climate , 1991 .

[16]  Eric F. Wood,et al.  The Effect of Soil Thermal Conductivity Parameterization on Surface Energy Fluxes and Temperatures , 1998 .

[17]  G. Hornberger,et al.  A Statistical Exploration of the Relationships of Soil Moisture Characteristics to the Physical Properties of Soils , 1984 .

[18]  R. J. Hanks,et al.  Applied Soil Physics , 1992, Advanced Series in Agricultural Sciences.

[19]  S. P. S. Arya,et al.  Introduction to micrometeorology , 1988 .

[20]  Boris Katz,et al.  Recent Changes Implemented into the Global Forecast System at NMC , 1991 .

[21]  M. Novello,et al.  Geodesic motion and confinement in Gödel's universe , 1983 .

[22]  Land-surface scheme validation using the Oklahoma Atmospheric Surface-layer Instrumentation System (OASIS) and Oklahoma Mesonet data: Preliminary results , 2002 .

[23]  K. Mitchell,et al.  Simple water balance model for estimating runoff at different spatial and temporal scales , 1996 .

[24]  R. Pielke,et al.  Simulation of the effects of surface fluxes of heat and moisture in a mesoscale numerical model: 1. Soil layer , 1981 .

[25]  J. Noilhan,et al.  Sensitivity study and validation of a land surface parameterization using the HAPEX-MOBILHY data set , 1990 .

[26]  W. Rouse,et al.  A Comparison of Sensible and Latent Heat Flux Calculations Using the Bowen Ratio and Aerodynamic Methods , 1989 .

[27]  M. Ek,et al.  The Influence of Atmospheric Stability on Potential Evaporation , 1984 .

[28]  K. Mitchell,et al.  Assessment of the Land Surface and Boundary Layer Models in Two Operational Versions of the NCEP Eta Model Using FIFE Data , 1997 .

[29]  G. Mellor,et al.  A Hierarchy of Turbulence Closure Models for Planetary Boundary Layers. , 1974 .

[30]  H. Pan,et al.  A two-layer model of soil hydrology , 1984 .

[31]  D. Deaven,et al.  Changes to the Operational ''Early'' Eta Analysis / Forecast System at the National Centers for Environmental Prediction , 1996 .

[32]  Z. Sorbjan,et al.  Structure of the atmospheric boundary layer , 1989 .

[33]  D. Stensrud,et al.  Mean Monthly Diurnal Cycles Observed with PRE-STORM Surface Data , 1998 .

[34]  S. Verma,et al.  Components of surface energy balance in a temperate grassland ecosystem , 1990 .

[35]  H. Pan,et al.  Interaction between soil hydrology and boundary-layer development , 1987 .

[36]  K. Mitchell,et al.  Impact of Atmospheric Surface-layer Parameterizations in the new Land-surface Scheme of the NCEP Mesoscale Eta Model , 1997 .

[37]  J. M. Schneider,et al.  Spatiotemporal Variations in Soil Water: First Results from the ARM SGP CART Network , 2003 .

[38]  J. D. Tarpley,et al.  Validation of the North American Land Data Assimilation System (NLDAS) retrospective forcing over the southern Great Plains : GEWEX Continental-Scale International Project, Part 3 (GCIP3) , 2003 .

[39]  T. Black The new NMC mesoscale Eta Model: description and forecast examples , 1994 .

[40]  C. Paulson The Mathematical Representation of Wind Speed and Temperature Profiles in the Unstable Atmospheric Surface Layer , 1970 .

[41]  J. D. Tarpley,et al.  The multi‐institution North American Land Data Assimilation System (NLDAS): Utilizing multiple GCIP products and partners in a continental distributed hydrological modeling system , 2004 .

[42]  Jack F. Paris,et al.  A Physicoempirical Model to Predict the Soil Moisture Characteristic from Particle-Size Distribution and Bulk Density Data 1 , 1981 .

[43]  G. Gayno,et al.  Implementation of Noah land-surface model advances in the NCEP operational mesoscale Eta model , 2003 .

[44]  Fedor Mesinger,et al.  A blocking technique for representation of mountains in atmospheric models , 1984 .