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  Photosynthetic productivity and its efficiencies in ISIMIP2a biome models: benchmarking for impact assessment studies

Ito, A., Nishina, K., Reyer, C. P. O., Francois, L., Henrot, A.-J., Munhoven, G., Jacquemin, I., Tian, H., Yang, J., Pan, S., Morfopoulos, C., Betts, R., Hickler, T., Steinkamp, J., Ostberg, S., Schaphoff, S., Ciais, P., Chang, J., Rafique, R., Zeng, N., Zhao, F. (2017): Photosynthetic productivity and its efficiencies in ISIMIP2a biome models: benchmarking for impact assessment studies. - Environmental Research Letters, 12, 8, 85001.
https://doi.org/10.1088/1748-9326/aa7a19

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 Creators:
Ito, A.1, Author
Nishina, K.1, Author
Reyer, Christopher P. O.2, Author              
Francois, L.1, Author
Henrot, A.-J.1, Author
Munhoven, G.1, Author
Jacquemin, I.1, Author
Tian, H.1, Author
Yang, J.1, Author
Pan, S.1, Author
Morfopoulos, C.1, Author
Betts, R.1, Author
Hickler, T.1, Author
Steinkamp, J.1, Author
Ostberg, Sebastian2, Author              
Schaphoff, Sibyll2, Author              
Ciais, P.1, Author
Chang, J.1, Author
Rafique, R.1, Author
Zeng, N.1, Author
Zhao, Fang2, Author               more..
Affiliations:
1External Organizations, ou_persistent22              
2Potsdam Institute for Climate Impact Research, ou_persistent13              

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 Abstract: Simulating vegetation photosynthetic productivity (or gross primary production, GPP) is a critical feature of the biome models used for impact assessments of climate change. We conducted a benchmarking of global GPP simulated by eight biome models participating in the second phase of the Inter-Sectoral Impact Model Intercomparison Project (ISIMIP2a) with four meteorological forcing datasets (30 simulations), using independent GPP estimates and recent satellite data of solar-induced chlorophyll fluorescence as a proxy of GPP. The simulated global terrestrial GPP ranged from 98 to 141 Pg C yr−1 (1981–2000 mean); considerable inter-model and inter-data differences were found. Major features of spatial distribution and seasonal change of GPP were captured by each model, showing good agreement with the benchmarking data. All simulations showed incremental trends of annual GPP, seasonal-cycle amplitude, radiation-use efficiency, and water-use efficiency, mainly caused by the CO2 fertilization effect. The incremental slopes were higher than those obtained by remote sensing studies, but comparable with those by recent atmospheric observation. Apparent differences were found in the relationship between GPP and incoming solar radiation, for which forcing data differed considerably. The simulated GPP trends co-varied with a vegetation structural parameter, leaf area index, at model-dependent strengths, implying the importance of constraining canopy properties. In terms of extreme events, GPP anomalies associated with a historical El Niño event and large volcanic eruption were not consistently simulated in the model experiments due to deficiencies in both forcing data and parameterized environmental responsiveness. Although the benchmarking demonstrated the overall advancement of contemporary biome models, further refinements are required, for example, for solar radiation data and vegetation canopy schemes.

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 Dates: 2017
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1088/1748-9326/aa7a19
PIKDOMAIN: Climate Impacts & Vulnerabilities - Research Domain II
PIKDOMAIN: Earth System Analysis - Research Domain I
eDoc: 7688
Research topic keyword: Climate impacts
Research topic keyword: Ecosystems
Research topic keyword: Land use
Model / method: Model Intercomparison
Regional keyword: Global
Organisational keyword: RD2 - Climate Resilience
Organisational keyword: RD1 - Earth System Analysis
Working Group: Earth System Model Development
Working Group: Terrestrial Safe Operating Space
Working Group: Forest and Ecosystem Resilience
Working Group: Land Use and Resilience
 Degree: -

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Title: Environmental Research Letters
Source Genre: Journal, SCI, Scopus, p3, oa
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Pages: - Volume / Issue: 12 (8) Sequence Number: 85001 Start / End Page: - Identifier: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/150326