Comparing the performance of the Canadian land surface scheme @class) for two subarctic terrain types

Bellisario, Lianne; Boudreau, L. Dale; Verseghy, Diana; Rouse, Wayne R.; Blanken, Peter D.

doi:10.1080/07055900.2000.9649645

Cited by 21 publications

(13 citation statements)

References 25 publications

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“…Soil temperature was overestimated in the summer period, but simulated values agreed fairly well with observations for the remainder of the year. Difficulty in simulating soil surface temperature, particularly in forest ecosystems, is a problem common to many land surface models (e.g., Chen et al, 1997;Bellisario et al, 2000). One possible explanation here is that the net radiation simulated at the soil surface was too high due to a slight underestimation of radiation absorbed within the canopy.…”

Section: Results a Comparison Of Observed And Simulated Datamentioning

confidence: 75%

Sensitivity tests of the integrated biosphere simulator to soil and vegetation characteristics in a pacific coastal coniferous forest

et al. 2002

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Section: Results a Comparison Of Observed And Simulated Datamentioning

confidence: 75%

Sensitivity tests of the integrated biosphere simulator to soil and vegetation characteristics in a pacific coastal coniferous forest

et al. 2002

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“…For instance, inclusion of the OSL in the model led to appreciable improvements in simulated soil heat flux and surface temperature, providing an additional explanation for why existing land surface models tend to overestimate soil "skin" temperature and downward soil heat flux. Betts et al [1993] and Chen et al [1997] related this problem to the numerical algorithms adopted to solve the surface energy balance (see also Beljaars [1991] for numerical details). Results for soil temperature at the NOBS site also showed that the inclusion of a surface organic layer delays the start of thawing, which in turn affects soil moisture availability, although it is clear that with increasing depth, the simulation of this delay is much less satisfactory (see Figure 12d).…”

Section: Nobs Sitementioning

confidence: 99%

“…For all the simulations reported here, vegetation was treated as "static" in the IBIS vegetation dynamics module; i.e., no change in stand structure was assumed to occur during the periods for which simulations were performed. Figure 1 provides a schematic description of the LSX land surface scheme as coupled with the photosynthetic model of Collatz et al [1991] For each hourly time step, IBIS simulated the energy and C balances using the following forcing variables: air temperature, hourly total precipitation, wind speed, humidity, incoming short-wave and long-wave radiation, and surface air pressure. Incoming long-wave radiation, whenever missing, was estimated using the formula of Satterlund [1979].…”

Section: Model Descriptionmentioning

confidence: 99%

“…According to the Collatz [1991,1992] model used in IBIS, changes in stomatal conductance to water vapour lead directly to changes in COx uptake. The improvements in LE resulting from including the OSL in the NOBS simulations therefore also appear to contribute to improved simulation of NEE, with both a higher mean and a wider range between minimum and maximum values (Figures 11g and 11h).…”

Section: Nobs Sitementioning

confidence: 99%

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Validation of the Integrated Biosphere Simulator over Canadian deciduous and coniferous boreal forest stands

Maayar¹,

Price²,

Delire³

et al. 2001

J. Geophys. Res.

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Abstract. Data collected during the Boreal Ecosystem-Atmosphere Study (BOREAS) at four different forest stands were used to test surface energy and carbon fluxes simulated by the Integrated Biosphere Simulator (IBIS). These stands included deciduous and conifer species and were located in both the BOREAS northern and southern study areas. Two runs were made: one using the original IBIS model and the other using a version modified to consider an organic soil layer (OSL) covering the mineral soil surface. Results show that the inclusion of the OSL substantially improved the simulation of soil heat flux, as well as of temperature and moisture in the topmost soil layer. Simulations show that latent and sensible heat fluxes, and net ecosystem exchange of carbon, were not affected appreciably by the presence of a thin (10 cm or less) OSL covering the forest floor. With a thick (50 cm) OSL, however, simulation of latent heat flux and net ecosystem exchange of carbon was substantially improved. Consideration of the OSL in the model also led to better simulation of the onsets of soil thawing. Correct estimation of heat diffusion to deep soil through thick organic layers requires a parameterization that accounts for the state of the organic material decomposition. Simulations presented here also show the necessity for using detailed information on soil physical properties for better evaluation of model performance.

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“…The ability of CLASS to simulate summer energy balance has been confirmed for various types of terrain (Bartlett et al 2002;Bellisario et al 2000;Comer et al 2000;Lafleur et al 2000). For example, for a boreal forest in north-central Manitoba, Bartlett et al (2002) showed that CLASS V2.6.…”

Section: Land Surface Model: Class V36mentioning

confidence: 88%

Impacts of boreal hydroelectric reservoirs on seasonal climate and precipitation recycling as simulated by the CRCM5: a case study of the La Grande River watershed, Canada

Irambona¹,

Music

Nadeau

et al. 2016

Theor Appl Climatol

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Located in northern Quebec, Canada, eight hydroelectric reservoirs of a 9782-km 2 maximal area cover 6.4% of the La Grande watershed. This study investigates the changes brought by the impoundment of these reservoirs on seasonal climate and precipitation recycling. Two 30-year climate simulations, corresponding to pre-and post-impoundment conditions, were used. They were generated with the fifthgeneration Canadian Regional Climate Model (CRCM5), fully coupled to a 1D lake model (FLake). Seasonal temperatures and annual energy budget were generally well reproduced by the model, except in spring when a cold bias, probably related to the overestimation of snow cover, was seen. The difference in 2-m temperature shows that reservoirs induce localized warming in winter (+0.7 ± 0.02°C) and cooling in the summer (−0.3 ± 0.02°C). The available energy at the surface increases throughout the year, mostly due to a decrease in surface albedo. Fall latent and sensible heat fluxes are enhanced due to additional energy storage and availability in summer and spring. The changes in precipitation and runoff are within the model internal variability. At the watershed scale, reservoirs induce an additional evaporation of only 5.9 mm year −1 (2%). We use Brubaker's precipitation recycling model to estimate how much of the precipitation is recycled within the watershed. In both simulations, the maximal precipitation recycling occurs in July (less than 6%), indicating weak land-atmosphere coupling. Reservoirs do not seem to affect this coupling, as precipitation recycling only decreased by 0.6% in July.

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Comparing the performance of the Canadian land surface scheme @class) for two subarctic terrain types

Cited by 21 publications

References 25 publications

Sensitivity tests of the integrated biosphere simulator to soil and vegetation characteristics in a pacific coastal coniferous forest

Sensitivity tests of the integrated biosphere simulator to soil and vegetation characteristics in a pacific coastal coniferous forest

Validation of the Integrated Biosphere Simulator over Canadian deciduous and coniferous boreal forest stands

Impacts of boreal hydroelectric reservoirs on seasonal climate and precipitation recycling as simulated by the CRCM5: a case study of the La Grande River watershed, Canada

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