Journal article

The potential of OCO-2 data to reduce the uncertainties in CO2 surface fluxes over Australia using a variational assimilation scheme

Yohanna Villalobos, Peter Rayner, Steven Thomas, Jeremy Silver

Copernicus GmbH


Abstract. This paper addresses the question of how much uncertainties in CO2 fluxes over Australia can be reduced by assimilation of total-column carbon dioxide retrievals from the Orbiting Carbon Observatory-2 (OCO-2) satellite instrument. We apply a four-dimensional variational data assimilation system, based around the Community Multiscale Air Quality (CMAQ) transport-dispersion model. We ran a series of observing system simulation experiments to estimate posterior error statistics of optimized monthly mean CO2 fluxes in Australia. Our assimilations were run with a horizontal grid resolution of 81 km using OCO-2 data for 2015. We found that on average, the total Australia flux uncertainty..

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University of Melbourne Researchers

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