Uncertainty and Emergent Constraints on Enhanced Ecosystem Carbon Stock by Land Greening

Chenyu Bian, Jianyang Xia, Xuanze Zhang, Kun Huang, Erqian Cui, Jian Zhou, Ning Wei, Ying Ping Wang, Danica Lombardozzi, Daniel S. Goll, Jürgen Knauer, Vivek Arora, Wenping Yuan, Stephen Sitch, Pierre Friedlingstein, Yiqi Luo

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Significant land greening since the 1980s has been detected through satellite observation, forest inventory, and Earth system modeling. However, whether and to what extent global land greening enhances ecosystem carbon stock remains uncertain. Here, using 40 global models, we first detected a positive correlation between the terrestrial ecosystem carbon stock and leaf area index (LAI) over time. Then, we diagnose the source of uncertainty of simulated the sensitivities of ecosystem carbon stock to LAI based on a traceability analysis. We found that the sensitivity of gross primary productivity (GPP) to LAI is the largest contributor to the model uncertainty in more than 60% of the vegetated grids. Using the ensemble of four long-term global data sets of GPP and three satellite LAI products from 1982 to 2014, we provided an emergent constraint on the ecosystem carbon stock increase as 0.75 ± 0.46 kg C m−2 per unit LAI over global land areas. Furthermore, the biome-based results reveal that the tropical forest regions have the highest inter-model variation and model bias. Overall, this study identifies the uncertainty source and provides constrained estimates of the greening effect on ecosystem carbon stock at the global scale.

Original languageEnglish (US)
Article numbere2022MS003397
JournalJournal of Advances in Modeling Earth Systems
Volume15
Issue number5
DOIs
StatePublished - May 2023
Externally publishedYes

Keywords

  • ecosystem carbon stock
  • emergent constraints
  • global land greening
  • gross primary production
  • traceability analysis
  • uncertainty source

ASJC Scopus subject areas

  • Global and Planetary Change
  • Environmental Chemistry
  • General Earth and Planetary Sciences

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