Comparative analysis of land surface parameters on three typical underlying surfaces over the Tibetan Plateau

To improve land surface parameterizations of radiation and energy balance, eddy covariance measurements were performed on three typical land covers types over the Tibetan Plateau , including bare soil, naturally sparse alpine meadow and dense alpine grassland from 2007 to 2012. We investigated how land surface parameters changed with surface properties and vegetation canopy growth and analyzed the characteristics of diurnal and seasonal variations of aerodynamic parameters. Results show that the annual mean surface albedo and surface roughness lengths for momentum were 0.27 and 2.29 cm, 0.241 and 1.39 cm and 0.19 and 6.52 cm over bare soil, naturally sparse alpine meadow and dense alpine grassland areas, respectively. The yearly average turbulence transfer coefficients for momentum and sensible heat under neutral condition were 4.12×10^-3 and 2.29×10^-3, 4.11×10^-3 and 2.33×10^-3 and 6.67×10^-3 and 4.14×10^-3, respectively. The median values of κB^-1 averaged over multiple years are 6.65, 5.89 and 4.88, respectively.