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• W1967029389 abstract "The effect of doubling atmospheric CO2 concentration (Ca) on climate and vegetation is investigated using a combined climate-vegetation model. The vegetation model predicts the response of leaf area index, canopy transpiration (ET) and whole-plant carbon balance to changes in climate, soil moisture, and atmospheric CO2 forcing. This model has been embedded in the UK Meteorological Office Single Column Model (SCM), which provides the climate feedback to the vegetation. The vegetation model uses an optimisation approach to predict stomatal resistance, a biochemical model to predict photosynthesis and a simple carbon balance model to predict leaf area. Respiration is calculated as a function of leaf area and vegetation height. Clouds are assumed to be radiatively passive in the SCM to avoid unrealistic feedbacks. Simulations were performed with the fully interactive vegetation-climate model for an Amazon location with the present-day value of Ca (1 × CO2), and twice this value (2 × CO2). In addition, two other types of simulation were performed at both CO2 concentrations: one in which the vegetation component was forced only with 1 × CO2, and one using a fixed surface resistance. The latter case is equivalent to simulations using most current general circulation models. In all the simulations, increased atmospheric CO2 caused an increase in surface temperature owing to increased radiative forcing. With a fixed resistance, mean ET was increased by 5.6% and sensible heat flux was reduced by 3.8%. The fully interactive model had significant effects on the response of both climate and productivity to Ca. Increased Ca caused stomatal closure, which resulted in a reduction in mean ET of 25%. The effect of Ca on ET was amplified by the positive feedback resulting from the effect of increased air humidity deficit on stomatal resistance. Gross primary productivity (GPP) was predicted to increase by 19.4% in the fully interactive model. With a fixed resistance, GPP increased by 34.3%. This difference in the predicted increase in GPP is due to the effect of stomata on the humidity of the planetary boundary layer. It is concluded that vegetation and climate responses to atmospheric CO2 concentration cannot be considered in isolation: the effects of the feedbacks could be at least as important as any direct effects." @default.
• W1967029389 created "2016-06-24" @default.
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• W1967029389 date "1995-03-01" @default.
• W1967029389 modified "2023-09-27" @default.
• W1967029389 title "Modelling the effects of atmospheric C02 on vegetation-atmosphere interactions" @default.
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• W1967029389 doi "https://doi.org/10.1016/0168-1923(94)05079-l" @default.
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