Extended Data Fig. 1: In situ atmospheric CO2 measurements across East Asia.
From: Large Chinese land carbon sink estimated from atmospheric carbon dioxide data
a, Map showing the location of atmospheric CO2 measurement sites over East Asia used in our numerical experiments. Coloured dots represent individual measurement sites referred to by letter codes (Supplementary Tables 1, 2). Blue dots represent NOAA ObsPack stations, the cyan dot represents the HKG station from WDCGG, brown dots represent Siberia stations and orange dots represent CMA regional background stations. b–g, CO2 mole fraction observations (in parts per million, ppm) at the six sites across China from 2009 to 2017 used in this study. Discrete (weekly) flask air samples, denoted by blue dots, and continuous (hourly) observations, denoted by black dots, are collected and analysed by the China Meteorological Administration. CRDS, cavity ring-down spectrometer.
