Search Results

You are looking at 1 - 4 of 4 items for :

  • Cloud forcing x
  • The Cold Land Processes Experiment (CLPX) x
  • All content x
Clear All
Glen E. Liston, Christopher A. Hiemstra, Kelly Elder, and Donald W. Cline

cycles within land, atmospheric, hydrologic, and ecologic systems, it is essential that models used to describe these systems include snow-related processes. Key snow distribution and evolution features include the considerable spatial and temporal variability that characterize snow accumulation and ablation processes. These variations are controlled by a combination of spatially and temporally variable atmospheric forcing conditions and how those forcings interact with relatively static local

Full access
Glen E. Liston and Christopher A. Hiemstra

patterns, but the magnitudes are often deficient. This error can be the result of limitations in the model physics, errors in meteorological forcing (e.g., snow precipitation; Liston and Sturm 2004 ), and deficiencies in boundary conditions [e.g., relatively low-resolution topography and vegetation data; Liston and Sturm (1998) ; Hiemstra et al. (2006) ; Liston et al. (2007) ]. These inadequacies can propagate the associated errors in many ways ( Burrough and McDonnell 1998 ). For example

Full access
Robert E. Davis, Thomas H. Painter, Rick Forster, Don Cline, Richard Armstrong, Terry Haran, Kyle McDonald, and Kelly Elder

and Appel 2004 ). Recent progress has reported on how to estimate snow surface grain size and wetness as well ( Green et al. 2002 ; Painter et al. 2003 ). However, snow reflectance in the visible and near-infrared region is insensitive to snow water equivalent (except for shallow snow) because the radiation in these wavelengths does not significantly penetrate. Furthermore, visible and near-infrared sensing requires solar illumination and cannot see through clouds or forest elements. The CLPX

Full access
John Pomeroy, Chad Ellis, Aled Rowlands, Richard Essery, Janet Hardy, Tim Link, Danny Marks, and Jean Emmanuel Sicart

-canopy irradiance, while an array of 20 pyranometers measured mean subcanopy irradiance, with 10 for each forest stand. The above-canopy shortwave irradiance on days 87 and 88 indicated clear sky conditions, dominated by direct-beam radiation. Daily mean transmissivities on these clear days were 0.23 and 0.25 for the uniform stand and 0.52 and 0.56 for the discontinuous stand. On day 86, variable cloud optical depths resulted in substantially reduced irradiance compared to possible direct-beam magnitudes, with

Full access