At the end of the last ice age, rising atmospheric CO2 levels coincided with a decline in radiocarbon activity, suggesting the release of highly radiocarbon-depleted CO2 from the deep ocean to the atmosphere.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/upper-ocean-atmosphere-radiocarbon-offsets-imply-fast-deglacial-carbon-dioxide
[2] http://admin.indiaenvironmentportal.org.in/category/author/kathryn-rose
[3] http://admin.indiaenvironmentportal.org.in/category/author/elisabeth-l-sikes
[4] http://admin.indiaenvironmentportal.org.in/category/author/thomas-p-guilderson-et-al
[5] http://admin.indiaenvironmentportal.org.in/category/journal/nature
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-science
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-dioxide
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/antarctica
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/oceans-and-seas