Indian Ocean radiocarbon

Figure 4 Average vertical profiles for the major ocean basins. Except for the Southern Ocean the dotted line is for the Southern Hemisphere and the solid line for the Northern Hemisphere. The Pacific and Southern Ocean profiles were compiled from WOCE data the Atlantic profiles from TTO and SAVE data and the Indian Ocean profiles from GEOSECS data. In approximately the upper 1000 m = 1000 dB) of each profile, the natural A C is contaminated with bomb-produced radiocarbon.

This model estimate is supported by a comparison of radiocarbon monoxide ( CO) in low-latitude clean Southern Hemispheric air with that over the northern Indian Ocean, as measured from samples taken from the RW Brown. The clean air samples south of the ITCZ contained on average 55 parts per billion by volume (ppbv) of CO and 6.2 molecules of CO/cm whereas north of the ITCZ, this was 155 ppbv and 9.7 molecules/cm [26]. The CO difference between these air masses must be of biogenic origin, i.e., mainly biomass burning, because fossil fuels are radiocarbon-depleted. Previous analysis has shown that biomass burning adds 0.038 molecules of " CO/cm per ppbv of CO [26]. If we assume further that... 

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