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Marko Scholze

Senior lecturer

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Assimilating solar-induced chlorophyll fluorescence into the terrestrial biosphere model BETHY-SCOPE v1.0 : Model description and information content

Author

  • Alexander J. Norton
  • Peter J. Rayner
  • Ernest N. Koffi
  • Marko Scholze

Summary, in English

The synthesis of model and observational information using data assimilation can improve our understanding of the terrestrial carbon cycle, a key component of the Earth's climate-carbon system. Here we provide a data assimilation framework for combining observations of solar-induced chlorophyll fluorescence (SIF) and a process-based model to improve estimates of terrestrial carbon uptake or gross primary production (GPP). We then quantify and assess the constraint SIF provides on the uncertainty in global GPP through model process parameters in an error propagation study. By incorporating 1 year of SIF observations from the GOSAT satellite, we find that the parametric uncertainty in global annual GPP is reduced by 73ĝ€% from ±19.0 to ±5.2ĝ€Pgĝ€†Cĝ€†yrĝ-1. This improvement is achieved through strong constraint of leaf growth processes and weak to moderate constraint of physiological parameters. We also find that the inclusion of uncertainty in shortwave down-radiation forcing has a net-zero effect on uncertainty in GPP when incorporated into the SIF assimilation framework. This study demonstrates the powerful capacity of SIF to reduce uncertainties in process-based model estimates of GPP and the potential for improving our predictive capability of this uncertain carbon flux.

Department/s

  • Dept of Physical Geography and Ecosystem Science
  • eSSENCE: The e-Science Collaboration
  • MERGE: ModElling the Regional and Global Earth System
  • BECC: Biodiversity and Ecosystem services in a Changing Climate

Publishing year

2018-04-17

Language

English

Pages

1517-1536

Publication/Series

Geoscientific Model Development

Volume

11

Issue

4

Document type

Journal article

Publisher

Copernicus GmbH

Topic

  • Other Earth and Related Environmental Sciences

Status

Published

ISBN/ISSN/Other

  • ISSN: 1991-959X