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Modeling water and heat balance of the boreal landscape - comparison of forest and arable land in Scandinavia
KTH, Superseded Departments, Land and Water Resources Engineering.
KTH, Superseded Departments, Land and Water Resources Engineering.
2004 (English)In: Journal of applied meteorology (1988), ISSN 0894-8763, Vol. 43, no 11, 1750-1767 p.Article in journal (Refereed) Published
Abstract [en]

The water and heat balances of an arable field and a forest in the boreal zone in Scandinavia were explored using 3 yr of observations and simulations with two different soil - vegetation - atmosphere transfer (SVAT) models over a 30-yr period. Results from a detailed mechanistic model [ coupled heat and mass transfer model ( COUP)] were compared with those obtained with a large-scale type of SVAT model used in the weather prediction model at the European Centre for Medium-Range Weather Forecasts [ECMWF tiled land surface scheme (TESSEL)]. The COUP model simulations agreed well with the observations from a seasonal perspective. The TESSEL model differed significantly from the measurements when standard operational parameter values were used. The introduction of a seasonal variation in leaf-area index values, tuned canopy resistance for forest, and a reduced roughness length over snow-covered open land reduced the discrepancies. Net radiation was 40% higher in the forest when compared with the arable land, based on 30-yr simulations with both models. Furthermore, the forest was a net source of sensible heat flux, whereas the arable land was a net sink. Because of different treatment of winter interception evaporation, forest latent heat flux based on the COUP model considerably exceeded that from the TESSEL model, and suggested that the total annual evaporation was higher from the forest than from arable land. The representation of interception evaporation in winter, as well as seasonal dynamics in vegetation properties are, thus, of considerable importance for adequate simulation of forest and arable land energy fluxes within the boreal zone.

Place, publisher, year, edition, pages
2004. Vol. 43, no 11, 1750-1767 p.
Keyword [en]
long-term measurements, plant-atmosphere variables, surface parameterization, future-directions, intercepted snow, growing-season, energy-balance, ecmwf model, grass ley, evaporation
National Category
Meteorology and Atmospheric Sciences
URN: urn:nbn:se:kth:diva-23963DOI: 10.1175/JAM2163.1ISI: 000225806600015ScopusID: 2-s2.0-11344258103OAI: diva2:342662
QC 20100525 QC 20110915Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2011-09-15Bibliographically approved

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Gustafsson, DavidJansson, Per-Erik
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