Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 7 2 2010 10.5194/bg-7-557-2010 http://www.biogeosciences.net/7/557/2010/ http://www.biogeosciences.net/7/557/2010/bg-7-557-2010.html http://www.biogeosciences.net/7/557/2010/bg-7-557-2010.pdf 557 568 2010-02-10 Numerical study of surface energy partitioning on the Tibetan plateau: comparative analysis of two biosphere models J. Hong J. Kim Global Environment Laboratory, Department of Atmospheric Sciences, Yonsei University, Seoul, Korea The Tibetan Plateau is a critical region in the research of biosphere-atmosphere interactions on both regional and global scales due to its relation to Asian summer monsoon and El Niño. The unique environment on the Plateau provides valuable information for the evaluation of the models' surface energy partitioning associated with the summer monsoon. In this study, we investigated the surface energy partitioning on this important area through comparative analysis of two biosphere models constrained by the in-situ observation data. Indeed, the characteristics of the Plateau provide a unique opportunity to clarify the structural deficiencies of biosphere models as well as new insight into the surface energy partitioning on the Plateau. Our analysis showed that the observed inconsistency between the two biosphere models was mainly related to: 1) the parameterization for soil evaporation; 2) the way to deal with roughness lengths of momentum and scalars; and 3) the parameterization of subgrid velocity scale for aerodynamic conductance. Our study demonstrates that one should carefully interpret the modeling results on the Plateau especially during the pre-monsoon period. Arya, S P.: Introduction to Micrometeorology, Academic Press, 2001. Beljaars, A C.: The parameterization of surface fluxes in large-scale models under free convection, Q. J. Roy. Meteorol. Soc., 121, 255–270, 1995. Beljaars, A C. and Viterbo, P.: The sensitivity of winter evaporation to the formulation of aerodynamic resistance in the ECMWF model, Bound.-Lay. Meteorol., 71, 135–149, 1994. Brutsaert, W. and Mawdsley, J A.: Sensible heat transfer parameterization for surfaces with anisothermal dense vegetation, J. Atmos. Sci., 53, 209–216, 1996. Businger, J A.: A note on free convection, Bound.-Lay. Meteorol., 4, 323–326, 1973. Camilo, P. and Schmugge, T J.: A computer program for the simulation of heat and moisture flow in soils, vol. 82121, NASA Tech. Memo., Maryland, USA, 1981. Chen, F. and Dudhia, J.: Coupling an advanced land surface-hydrology model with the Penn State-NCAR MM5 modeling system. Part I: Model Implementation and sensitivity, Mon. Weather Rev., 129, 569–585, 2001. Chen, F., Janjic, Z., and Mitchell, K.: Impact of atmospheric surface-layer parameterizations in the new land-surface scheme of the NCEP mesoscale ETA model, Bound.-Lay. Meteorol., 85, 391–421, 1997. Chen, L., Reiter, E R., and Feng, Z.: The atmosphere heat source over the Tibetan Plateau: May-August 1979, Mon. Weather Rev., 113, 1771–1790, 1985. Choi, T., Hong, J., Kim, J., Lee, H C., Asanuma, J., Ishikawa, H., Tsukamoto, O., Zhiqiu, G., Ma, Y., Ueno, K., Wang, J., Koike, T., and Yasunari, T.: Turbulent Exchange of Heat, Water Vapor and Momentum over a Tibetan Prairie by Eddy Covariance and Flux-Variance Measurements, J. Geophys. Res., 109, D21106, \doi10.1029/2004JD004767, 2004. Cosby, B J., Hornberger, G M., Clapp, R B., and Ginn, T R.: A Statistical Exploration of the Relationships of Soil Moisture Characteristics to the Physical Properties of Soils, Water Resour. Res., 20, 682–690, 1984. Denman, K L., Brasseur, G., Chidthaisong, A., Ciais, P., Cox, P., Dickinson, R., Hauglustaine, D., Heinze, C., Holland, E., Jacob, D., Lohmann, U., Ramachandran, S., da~Silva~Dias, P., Wofsy, S., and Zhang, X.: Couplings Between Changes in the Climate System and Biogeochemistry, in: Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, edited by: Solomon, S., Qin, D., Manning, M., Chen, Z., Marquis, M., Averyt, K., M.Tignor, and Miller, H., Campbridge University Press, 499–587, 2007. Gao, Z.: Determination of soil heat flux in a Tibetan short-grass prairie, Bound.-Lay. Meteorol., 114, 165–178, 2005. Gao, Z., Chae, N., Kim, J., Hong, J., Choi, T., and Lee, H.: Modeling of surface energy partitioning, surface temperature and soil wetness in the Tibetan prairie using the Simple Biosphere Model 2 (SiB2), J. Geophys. Res., 109, D06102, \doi10.1029/2003JD004089, 2004. Garratt, J R.: The Atmospheric Boundary Layer, Cambridge University Press, 1992. Högstrom, U.: Review of some basic characteristics of the atmospheric surface layer, Bound.-Lay. Meteorol., 78, 215–246, 1996. Hong, J. and Kim, J.: Simulation of Surface Radiation Balance on the Tibetan Plateau, Geophys. Res. Lett., 35, L08814, \doi10.1029/2008GL033613, 2008. Hong, J., Choi, T., Ishikawa, H., and Kim, J.: Turbulence structures in the near-neutral surface layer on the Tibetan plateau, Geophy. Res. Lett., 31, L15016, \doi10.1029/2004GL 019935, 2004. Hopwood, W P.: Surface transfer of heat and momentum over an inhomogeneous vegetated land, Q. J. Roy. Meteorol. Soc., 121, 1549–1574, 1995. Jarvis, P.: The interpretation of the variations in leafwater potential and stomatal conductances found in canopies in the field, Philos. T. Roy. Soc. London, 273, 593–610, 1976. Kaimal, J C. and Finnigan, J J.: Atmospheric Boundary Layer Flows, Oxford University Press, New York, 1994. Lhomme, J P., Chehbouni, A., and Monteny, B.: Sensible heat flux-radiometric surface temperature relationship over sparse vegetation: Parameterizing B^−1, Bound.-Lay. Meteorol., 97, 431–457, 2000. Li, C. and Yanai, M.: The onset and interannual variability of the Asian summer monsoon in relation to land-sea thermal constrast, J. Climate, 9, 358–375, 1996. Mahrt, L. and Sun, J.: The subgrid scale in the bulk aerodynamic relationship for spatially averaged scalar fluxes, Mon. Weather Rev., 123, 3032–3041, 1995. McNaughton, K G. and Brunet, Y.: Townsend's hypothesis, coherent structures and Monin-Obukhov similarity, Bound.-Lay. Meteorol., 102, 161–175, 2002. McNaughton, K G. and Jarvis, P G.: Effects of spatial scale on stomatal control of transpiration, Agr. Forest Meteorol., 54, 279–301, 1991. McNaughton, K. G., Clement, R. J., and Moncrieff, J. B.: Scaling properties of velocity and temperature spectra above the surface friction layer in a convective atmospheric boundary layer, Nonlin. Processes Geophys., 14, 257–271, 2007. Peylin, P., P., Polcher, J., Bonan, G., Williamson, D L., and Laval, K.: Comparison of two complex land surface schemes coupled to the National Center for Atmospheric Research general circulation model, J. Geophys. Res., 102, 19413–19431, 1997. Raupach, M.: Combination theory and equilibrium Combination theory and equilibrium Combination theory and equilibrium evaporation, Q. J. Roy. Meteorol. Soc., 127, 1149–1181, 2001. Schüttemeyer, D., Holtslag, A. A M., and de~Bruin, H. A R.: Evaluation of two land surface schemes used in terrains of increasing aridity in west Africa, J. Hydrometerol., 9, 173–193, 2008. Sellers, P J., Heiser, M D., and Hall, F G.: Relations between surface conductance and spectral vegetation indices at intermediate (100 m² to 15 km²) length scales, J. Geophys. Res., 17, 19033–19059, 1992. Sellers, P J., Los, S O., Tucker, C J., Justice, C O., Dazlich, D A., Collatz, G J., and Randall, D A.: A revised land surface parameterization (SiB2) for atmospheric GCMs. Part II: The generation of global field of terrestrial biophysical parameters from satellite data , J. Climate, 9, 706–737, 1996a. Sellers, P J., Randall, D A., Collatz, G J., Berry, J A., Field, C B., Dazlich, D A., Zhang, C., Collelo, G D., and Bounoua, L.: A revised land surface parameterization (SiB2) for atmospheric GCMs. Part I: Model formulation, J. Climate, 9, 676–705, 1996b. Su, Z., Schmugge, T., Kustas, W P., and Massman, W J.: An evaluation of two models for estimation of the roughness height for heat transfer between the land surface and the atmosphere, J. Appl. Meteorol., 40, 1933–1951, 2001. Takayabu, I., Takata, K., Yamazaki, T., Ueno, K., Yabuki, H., and Haginoya, S.: Comparison of the four land surface models driven by a common forcing data prepared from GAME/Tibet POP97 products-Snow accumulation and soil freezing processes, J. Meteorol. Soc. Japan, 79, 535–554, 2001. Tsujimura, M., Kim, J., and Asanuma, J.: Surface energy balance, water balance, and stable isotope measurements in the Tibetan plateau, in: Proceeding of IAMAS, Innsbruck, Austria, 2001. van der Velde, R., Su, Z., Ek, M., Rodell, M., and Ma, Y.: Influence of thermodynamic soil and vegetation parameterizations on the simulation of soil temperature states and surface fluxes by the Noah LSM over a Tibetan plateau site, Hydrol. Earth Syst. Sci., 13, 759–777, 2009. Yang, K., Koike, T., and Yang, D.: Surface parameterization in the Tibetan plateau, Bound.-Lay. Meteorol., 116, 245–262, 2003. Yang, K., Koike, T., Ishikawa, H., Kim, J., Li, X., Liu, H., Liu, S M., Ma, Y., and Wang, J M.: Turbulent flux transfer over bare-soil surfaces: Characteristics and parameterization, J. Appl. Meteorol., 47, 276–290, 2008. Yang, K., Chen, Y.-Y., and Qin, J.: Some practical notes on the land surface modeling in the Tibetan Plateau, Hydrol. Earth Syst. Sci., 13, 687–701, 2009. Zeng, X., Zhao, M., and Dickinson, R E.: Intercomparison of bulk aerodynamic for the computation of sea surface fluxes using TOGA COARSE and TAO data, J. Climate, 11, 2628–2644, 1998. Zilitinkevich, S S.: Non-local turbulent transport: Pollution dispersion aspects of coherent structure of convective flows, in: Air Pollution-Volume I. Air Pollution Theory and Simulation, edited by: Power, H., Moussiopoulos, N., and Brebbia, C A., Computational Mechanics Publications, 53–60, 1995. Zobler, L.: A world soil file for global climate modeling, NASA Tech. Memo, 87802, 1986.