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Boreal forest surfa...
Boreal forest surface parameterization in the ECMWF model - 1D test with NOPEX long-term data
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- Gustafsson, David (author)
- KTH,Mark- och vattenteknik
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Lewan, E. (author)
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van den Hurk, Bjjm (author)
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Viterbo, P. (author)
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Grelle, A. (author)
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- Lindroth, Anders (author)
- Lund University,Lunds universitet,Institutionen för naturgeografi och ekosystemvetenskap,Naturvetenskapliga fakulteten,Dept of Physical Geography and Ecosystem Science,Faculty of Science
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Cienciala, E. (author)
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- Mölder, Meelis (author)
- Lund University,Lunds universitet,Institutionen för naturgeografi och ekosystemvetenskap,Naturvetenskapliga fakulteten,Dept of Physical Geography and Ecosystem Science,Faculty of Science
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- Halldin, S. (author)
- Uppsala universitet,Institutionen för geovetenskaper
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- Lundin, L. C. (author)
- Uppsala universitet,Institutionen för geovetenskaper
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(creator_code:org_t)
- 2003
- 2003
- English.
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In: Journal of applied meteorology (1988). - 0894-8763 .- 1520-0450. ; 42:1, s. 95-112
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Abstract
Subject headings
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- The objective of the present study was to assess the performance and recent improvements of the land surface scheme used operationally in the European Centre for Medium-Range Weather Forecasts (ECMWF) in a Scandinavian boreal forest climate/ecosystem. The previous (the 1999 scheme of P. Viterbo and A. K. Betts) and the new (Tiled ECMWF Surface Scheme for Exchange Processes over Land, TESSEL) surface schemes were validated by single-column runs against data from NOPEX (Northern Hemisphere Climate-Processes Land-Surface Experiment). Driving and validation datasets were prepared for a 3-yr period (1994-96). The new surface scheme, with separate surface energy balances for subgrid fractions (tiling), improved predictions of seasonal as well as diurnal variation in surface energy fluxes in comparison with the old scheme. Simulated wintertime evaporation improved significantly as a consequence of the introduced additional aerodynamic resistance for evaporation from snow lying under high vegetation. Simulated springtime evaporation also improved because the limitation of transpiration in frozen soils was now accounted for. However, downward sensible heat flux was still underestimated during winter, especially at nighttime, whereas soil temperatures were underestimated in winter and overestimated in summer. The new scheme also underestimated evaporation during dry periods in summer, whereas soil moisture was overestimated. Sensitivity tests showed that further improvements of simulated surface heat fluxes and soil temperatures could be obtained by calibration of parameters governing the coupling between the surface and the atmosphere and the ground heat flux, and parameters governing the water uptake by the vegetation. Model performance also improved when the seasonal variation in vegetation properties was included.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)
Keyword
- climate
- fluxes
- evaporation
- project
- schemes
- system
- future
- impact
- water
- fife
Publication and Content Type
- ref (subject category)
- art (subject category)
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To the university's database
- By the author/editor
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Gustafsson, Davi ...
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Lewan, E.
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van den Hurk, Bj ...
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Viterbo, P.
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Grelle, A.
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Lindroth, Anders
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show more...
-
Cienciala, E.
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Mölder, Meelis
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Halldin, S.
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Lundin, L. C.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Physical Geograp ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Oceanography Hyd ...
- Articles in the publication
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Journal of appli ...
- By the university
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Royal Institute of Technology
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Lund University
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Uppsala University