Fig. 1: The Southern-Hemisphere 14CO measurements and model results and the solar modulation parameter as functions of time. | Nature Communications

Fig. 1: The Southern-Hemisphere 14CO measurements and model results and the solar modulation parameter as functions of time.

From: Radiocarbon monoxide indicates increasing atmospheric oxidizing capacity

Fig. 1

(red) 14CO measurements at (a) Baring Head and (b) Arrival Heights. The red vertical bars reflect the standard measurement errors. (black solid lines) Monthly-mean surface 14CO, interpolated to the locations of Baring Head and Arrival Heights, as simulated by the NIWA-UKCA model (see below and section “ Galactic 14C production and the NIWA-UKCA model”). c Monthly-mean “solar modulation parameter" (SMP, in MeV) since 1989 (https://cosmicrays.oulu.fi/phi/Phi_Table_2017.txt). The blue digits and vertical bars conventionally enumerate and bound, respectively, the solar cycles (https://www.spaceweather.com/en/solar-activity/solar-cycle/historical-solar-cycles.html).

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