Investigations on the impact of permafrost on weather
High-latitude terrestrial variables and processes (e.g., permafrost, soil freezing and thawing, snow, interaction of soil moisture and soil temperature states, etc.) have received little systematic study in the context of numerical weather prediction (NWP) models. Many of the NWP models apply the fo...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.572.7968 http://www2.gi.alaska.edu/~molders/permafrost.pdf |
| Summary: | High-latitude terrestrial variables and processes (e.g., permafrost, soil freezing and thawing, snow, interaction of soil moisture and soil temperature states, etc.) have received little systematic study in the context of numerical weather prediction (NWP) models. Many of the NWP models apply the force-restore method with two or three reservoirs. However, force-restore models are fundamentally limited in their ability to resolve the various soil horizons (Montaldo and Albertson 2001), as well as the vertical variation of root distribution and soil frost processes. NWP models require information on the water and energy fluxes to the atmosphere at time steps of several minutes or so as lower bounary conditiona. It is obvious that at such time scale highly resolved permafrost models are computationally prohibitive. The thermo-dynamic soil vegetation scheme (HTSVS) was developed for determining these fluxes at the biosphere/snow-atmosphere interface in atmospheric models. HTSVS considers one canopy layer, multiple snow and soil layers. It describes (1) the exchange of momentum, heat, and moisture at the vegetation-soil-atmosphere interface, with special consideration given to the heterogeneity on the micro-scale by the |
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