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Lower oceanic δ13C during the last interglacial period compared to the Holocene ArchiMer
Bengtson, Shannon A.; Menviel, Laurie C.; Meissner, Katrin J.; Missiaen, Lise; Peterson, Carlye D.; Lisiecki, Lorraine E.; Joos, Fortunat.
The last time in Earth's history when high latitudes were warmer than during pre-industrial times was the last interglacial period (LIG, 129–116 ka BP). Since the LIG is the most recent and best documented interglacial, it can provide insights into climate processes in a warmer world. However, some key features of the LIG are not well constrained, notably the oceanic circulation and the global carbon cycle. Here, we use a new database of LIG benthic δ13C to investigate these two aspects. We find that the oceanic mean δ13C was  ∼  0.2 ‰ lower during the LIG (here defined as 125–120 ka BP) when compared to the Holocene (7–2 ka BP). A lower terrestrial carbon content at the LIG than during the Holocene could have led to both lower oceanic δ13C and atmospheric...
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