EGU23-15006, updated on 26 Feb 2023
EGU General Assembly 2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

A comprehensive synthesis of anthropogenic and natural sources and sinks of Australasia carbon budget (2010-2019)

Yohanna Villalobos1, Pep Canadell1, Peter Briggs1, Ian Harman1, Elizabeth D. Keller2, Beata Bukosa3, Sara E. Mikaloff-Fletcher3, Ben Smith4, Miko UF. Kirschbaum5, Donna Giltrap5, Liyin Liang5, Ronny Lauerwald6, Judith Rosentreter7, Taylor Maavara8, Laure Resplandy9, Peter J. Rayner10, Eva Schöemann11, and Sourish Basu12
Yohanna Villalobos et al.
  • 1CSIRO Environment, Canberra, 2601, Australia (
  • 2GNS Science, Lower Hutt, New Zealand and Victoria University of Wellington, Wellington, New Zealand
  • 3NIWA, National Institute of Water and Atmospheric Research, New Zealand
  • 4Hawkesbury Institute for the Environment, Western Sydney University, Richmond, NSW, Australia.
  • 5Manaaki Whenua -Landcare Research, Private Bag 11052, Palmerston North 4442, New Zealand.
  • 6Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, 91191, Gif-sur-Yvette, France
  • 7Yale Institute for Biospheric Studies, Yale University, New Haven, USA
  • 8Yale School of Forestry and Environmental Studies, New Haven, CT, USA
  • 9Department of Geosciences, High Meadows Environmental Institute, Princeton University, Princeton, NJ, USA.
  • 10School of Earth Sciences, University of Melbourne, VIC Australia
  • 11Institute of Environmental Physics, Heidelberg University, Germany
  • 12Earth System Science Interdisciplinary Center, University of Maryland, College Park MD, USA

Accurate national carbon budget assessments allow nations to evaluate their progress in cutting carbon emissions and therefore be aligned with the Paris Climate Agreement goals. To support the initiative of The REgional Carbon Cycle Assessment and Processes (RECCAP-2), we built a synthesis of the Australasia (Australia and New Zealand) terrestrial carbon budget for 2010-2019 based on top-down and bottom-up approaches. Major carbon flux components in the bottom-up budget (e.g., net primary productivity and heterotrophic respiration) were simulated by CABLE model, Biome-BGC model and Cewn simulations. In addition, this budget include carbon flux components from the land-ocean aquatic continuum, such as inland waters, estuaries, blue carbon ecosystems, and continental shelves and carbon fluxes embodied in trade (export and import) of crops, woods, livestock and fossil fuel. We reconciled Australia and New Zealand bottom-up budgets separately with fluxes derived from regional and global OCO-2, GOSAT flux inversions, as well as fluxes obtained from in-situ measurement only (CarbonWatchNZ). We found that annual mean budgets for Australia agree relatively well (within the uncertainty range) with regional and global top-down GOSAT and OCO-2 flux estimates. New Zealand's annual bottom-up carbon budget also agrees relatively well with fluxes derived from CarbonWatchNZ inversion and GOSAT but disagrees with global flux estimates from OCO-2.

How to cite: Villalobos, Y., Canadell, P., Briggs, P., Harman, I., Keller, E. D., Bukosa, B., Mikaloff-Fletcher, S. E., Smith, B., Kirschbaum, M. UF., Giltrap, D., Liang, L., Lauerwald, R., Rosentreter, J., Maavara, T., Resplandy, L., Rayner, P. J., Schöemann, E., and Basu, S.: A comprehensive synthesis of anthropogenic and natural sources and sinks of Australasia carbon budget (2010-2019), EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-15006,, 2023.