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Progress in Earth and Planetary Science
Fig. 3 | Progress in Earth and Planetary Science

Fig. 3

From: Toward a long-term atmospheric CO2 inversion for elucidating natural carbon fluxes: technical notes of NISMON-CO2 v2021.1

Fig. 3

Locations of observations used in the pseudo-observation inversion experiment. The observations are the same as those of NISMON-CO2 v2021.1 (Niwa 2020) but for those available during 2007–2018. Flask air sampling and in situ observations at ground-based stations are depicted by filled magenta and unfilled purple triangles, respectively. Light blue circles denote shipboard observational locations. Tower observation sites are denoted by cyan crosses

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