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• W2912335865 endingPage "179" @default.
• W2912335865 startingPage "167" @default.
• W2912335865 abstract "How terrestrial biosphere models (TBMs) represent leaf photosynthesis and its sensitivity to temperature are two critical components of understanding and predicting the response of the Arctic carbon cycle to global change. We measured the effect of temperature on the response of photosynthesis to irradiance in six Arctic plant species and determined the quantum yield of CO2 fixation () and the convexity factor (θ). We also determined leaf absorptance (α) from measured reflectance to calculate on an absorbed light basis () and enabled comparison with nine TBMs. The mean was 0.045 mol CO2 mol−1 absorbed quanta at 25°C and closely agreed with the mean TBM parameterisation (0.044), but as temperature decreased measured diverged from TBMs. At 5°C measured was markedly reduced (0.025) and 60% lower than TBM estimates. The θ also showed a significant reduction between 25°C and 5°C. At 5°C θ was 38% lower than the common model parameterisation of 0.7. These data show that TBMs are not accounting for observed reductions in and θ that can occur at low temperature. Ignoring these reductions in and θ could lead to a marked (45%) overestimation of CO2 assimilation at subsaturating irradiance and low temperature." @default.
• W2912335865 created "2019-02-21" @default.
• W2912335865 creator A5039579412 @default.
• W2912335865 creator A5061034566 @default.
• W2912335865 creator A5075978056 @default.
• W2912335865 creator A5076026599 @default.
• W2912335865 date "2019-03-18" @default.
• W2912335865 modified "2023-10-11" @default.
• W2912335865 title "Terrestrial biosphere models may overestimate Arctic <scp>CO</scp> ₂ assimilation if they do not account for decreased quantum yield and convexity at low temperature" @default.
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