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Torbern Tagesson

Forskare

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Modeling China's terrestrial ecosystem gross primary productivity with BEPS model : Parameter sensitivity analysis and model calibration

Författare

  • Xiuli Xing
  • Mousong Wu
  • Wenxin Zhang
  • Weimin Ju
  • Torbern Tagesson
  • Wei He
  • Songhan Wang
  • Jun Wang
  • Lu Hu
  • Shu Yuan
  • Tingting Zhu
  • Xiaorong Wang
  • Youhua Ran
  • Sien Li
  • Chunyu Wang
  • Fei Jiang
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Summary, in English

Terrestrial ecosystems are the largest sink for carbon, and their ecosystem gross primary productivity (GPP) regulates variations in atmospheric carbon dioxide (CO2) concentrations. Current process-based ecosystem models used for estimating GPP are subject to large uncertainties due to poorly constrained parameter values. In this study, we implemented a global sensitivity analysis (GSA) on parameters in the Boreal Ecosystem Productivity Simulator (BEPS) considering the parameters’ second-order impacts. We also applied the generalized likelihood estimation (GLUE) method, which is flexible for a multi-parameter calibration, to optimize the GPP simulation by BEPS for 10 sites covering 7 plant functional types (PFT) over China. Our optimized results significantly reduced the uncertainty of the simulated GPP over all the sites by 17 % to 82 % and showed that the GPP is sensitive to not only the photosynthesis-related parameters but also the parameters related to the soil water uptake as well as to the energy balance. The optimized GPP across South China showed that the mix forest, shrub, and grass have a higher GPP and are more controlled by the soil water availability. This study showed that the GLUE method together with the GSA scheme could constrain the ecosystem model well when simulating GPP across multiple ecosystems and provide a reasonable estimate of the spatial and temporal distribution of the ecosystem GPP over China. We call for more observations from more sites, as well as data on plant traits, to be collected in China in order to better constrain ecosystem carbon cycle modeling and understand its response to climate change.

Avdelning/ar

  • BECC: Biodiversity and Ecosystem services in a Changing Climate
  • Institutionen för naturgeografi och ekosystemvetenskap
  • MERGE: ModElling the Regional and Global Earth system

Publiceringsår

2023-12-15

Språk

Engelska

Publikation/Tidskrift/Serie

Agricultural and Forest Meteorology

Volym

343

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Climate Research
  • Physical Geography
  • Geosciences, Multidisciplinary

Nyckelord

  • Ecosystem modeling
  • Global sensitivity analysis
  • Gross primary productivity
  • Satellite-data-driven
  • Uncertainty analysis

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0168-1923