Fig. 2
Distribution of NO3- and δ13CDIC in the modern Pacific and [NO3−]-δ13CDIC-coupling in the intermediate Pacific - modern and downcore. All data for the modern Pacific have been taken from the GLODAPv2 database34. a Distribution of [NO3−] in the modern Pacific34. b Distribution of δ13C of dissolved inorganic carbon (DIC; δ13CDIC) in the modern Pacific34. The Ocean Data View software has been used to compile these plots62. c Correlation between [NO3−] and δ13CDIC in intermediate water depths (700–2000 m) of the modern Pacific (red, N = 4779) and between [NO3−]BW and δ13CFORAM in the sediment record of M77/2 52-2 (black, N = 44). Both linear regressions neither differ significantly in slope (P = 0.15) nor in intercept (P = 0.13). Due to graphical reasons all δ13C below −1‰ have been cut in this plot, although they were included into the fit. For a complete plot of all data points see Supplementary Figure 4B
