Conference Proceedings

Was Australia a sink or source of carbon dioxide in 2015? Data assimilation using OCO-2 satellite data

Yohanna Villalobos, Peter Rayner, Steven Thomas, Jeremy Silver

Copernicus GmbH

Abstract

<p>Estimates of the net CO<sub>2</sub> flux at a continental scale are essential to building up confidence in the global carbon budget. In this study, we present the assimilation of the satellite data from the Orbiting Carbon Observatory-2 (OCO-2) (land nadir and glint data) to estimate the Australian CO<sub>2</sub> surface fluxes for 2015. We used the Community Multiscale Air Quality (CMAQ) model and a four-dimensional variational scheme. Our preliminary results suggest that Australia was a slight carbon sink during 2015 of -0.15 +- 0.11 PgC y<sup>-1</sup> compared to the prior estimate of 0.13 +- 0.55 PgC y<sup>-1</sup>. The monthly sea..

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