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Article Dans Une Revue Geophysical Research Letters Année : 2016

Increased light-use efficiency in northern terrestrial ecosystems indicated by CO 2 and greening observations

Philippe Ciais
Daniel Hayes
  • Fonction : Auteur
Maoyi Huang
Atul Jain
Jiafu Mao
Shushi Peng
Benjamin Poulter
Xiaoying Shi
Hanqin Tian
Ning Zeng

Résumé

Observations show an increasing amplitude in the seasonal cycle of CO 2 (ASC) north of 45 ∘ N of 56 ± 9.8% over the last 50 years and an increase in vegetation greenness of 7.5-15% in high northern latitudes since the 1980s. However, the causes of these changes remain uncertain. Historical simulations from terrestrial biosphere models in the Multiscale Synthesis and Terrestrial Model Intercomparison Project are compared to the ASC and greenness observations, using the TM3 atmospheric transport model to translate surface fluxes into CO 2 concentrations. We find that the modeled change in ASC is too small but the mean greening trend is generally captured. Modeled increases in greenness are primarily driven by warming, whereas ASC changes are primarily driven by increasing CO 2. We suggest that increases in ecosystem-scale light use efficiency (LUE) have contributed to the observed ASC increase but are underestimated by current models. We highlight potential mechanisms that could increase modeled LUE.
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Dates et versions

hal-02922775 , version 1 (17-09-2020)

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Rebecca Thomas, Iain Colin Prentice, Heather Graven, Philippe Ciais, Joshua Fisher, et al.. Increased light-use efficiency in northern terrestrial ecosystems indicated by CO 2 and greening observations. Geophysical Research Letters, 2016, 43 (21), pp.11,339-11,349. ⟨10.1002/2016GL070710⟩. ⟨hal-02922775⟩
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