A note: radiocarbon data comparison of small gaseous samples measured by two micadas at eth zurich and ocean university of china

A MIni CArbon DAting System (MICADAS) has been recently installed at the Ocean University of China (OUC) mainly for determining the radiocarbon (C-14) ages for marine sedimentary organic carbon. In this study, we compared the data from a series of CO2 samples measured independently by the MICADAS at OUC and ETH Zurich to assess whether the data from the OUC MICADAS meet our requirement for carbon cycle research. The measured samples covered a range of C-14 ages from 1229 to 12,287 yr, and size from 5 to 162 mu g C. The data from the two instruments showed a good linear relationship with only small C-14 age offsets, meeting our research demands such as carbon source apportionment. Lastly, we propose that for MICADAS clients, such a cross-lab comparison of the size- and age-dependency of MICADAS using age-known samples is important for C-14 data integration.