Articles | Volume 14, issue 4
https://doi.org/10.5194/gmd-14-2029-2021
https://doi.org/10.5194/gmd-14-2029-2021
Model experiment description paper
 | 
20 Apr 2021
Model experiment description paper |  | 20 Apr 2021

How to reconstruct aerosol-induced diffuse radiation scenario for simulating GPP in land surface models? An evaluation of reconstruction methods with ORCHIDEE_DFv1.0_DFforc

Yuan Zhang, Olivier Boucher, Philippe Ciais, Laurent Li, and Nicolas Bellouin

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Cited articles

Alton, P., North, P., and Los, S.: The impact of diffuse sunlight on canopy light‐use efficiency, gross photosynthetic product and net ecosystem exchange in three forest biomes, Glob. Change Biol., 13, 776–787, 2007a. a
Alton, P., Ellis, R., Los, S., and North, P.: Improved global simulations of gross primary product based on a separate and explicit treatment of diffuse and direct sunlight, J. Geophys. Res.-Atmos., 112, D07203, https://doi.org/10.1029/2006JD008022, 2007b. a, b, c
Bellouin, N., Rae, J., Jones, A., Johnson, C., Haywood, J., and Boucher, O.: Aerosol forcing in the Climate Model Intercomparison Project (CMIP5) simulations by HadGEM2‐ES and the role of ammonium nitrate, J. Geophys. Res.-Atmos., 116, D20206, https://doi.org/10.1029/2011JD016074.1, 2011. a
Bellouin, N., O'Sullivan, M., Harris, I., and Sitch, S.: Diffuse fraction distributions 1901-2017 in support of carbon cycle modelling, figshare Dataset, https://doi.org/10.6084/m9.figshare.14423690, 2021a. a
Bellouin, N., O'Sullivan, M., and Sitch, S.: Diffuse fraction distributions 1901–2017 in support of carbon cycle modelling: Constant aerosols, figshare, Dataset, https://doi.org/10.6084/m9.figshare.14428160, 2021b. a
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Short summary
We investigated different methods to reconstruct spatiotemporal distribution of the fraction of diffuse radiation (Fdf) to qualify the aerosol impacts on GPP using the ORCHIDEE_DF land surface model. We find that climatological-averaging methods which dampen the variability of Fdf can cause significant bias in the modeled diffuse radiation impacts on GPP. Better methods to reconstruct Fdf are recommended.
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