The representation of arctic soils in the land surface model: The importance of mosses

摘要: Mosses dominate the surface cover in high northern latitudes and have potential to play a key role modifying thermal hydrologic regime of Arctic soils. These modifications turn feed back influence energy exchanges hence may affect regional climate. However, mosses are poorly represented models land surface. In this study NCAR Land Surface Model (LSM) was modified two ways. First, additional soil texture types including lichens were added more realistically represent Second, LSM also so that different type could be specified for each layer. Several experiments performed using climate data from an tundra site 1995. The model run homogeneous loam column then columns included moss, lichen, peat, sand. addition layer moss underlain by peat had substantial impact on modeled processes. acted as insulative producing cooler summer temperatures (6.9 8C lower at 0.5 m) warmer winter (2.38C higher when compared with homogenous column. greater infiltration, leading storage moisture layers Last, modulated decreasing heat flux (57% July) increasing turbulent fluxes (67% (15% July). effective contributors total latent heating than bare results suggest ability prescribe textures result plausible distribution water within these should incorporated into global models.