How old is too old? Implications of averaging 14C-Based estimates of ventilation age to assess the Pacific Ocean's role in sequestering CO2 in the past

How old is too old? Implications of averaging 14C-Based estimates of ventilation age to assess the Pacific Ocean's role in sequestering CO2 in the past
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太老了是多老?

DOI:
10.1016/j.quascirev.2023.108122
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发表时间:
2023
影响因子:
4
通讯作者:
Stott, Lowell D.
Stott, Lowell D.
中科院分区:
地球科学1区
文献类型:
--
作者:
Stott, Lowell D.

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Compilations of benthic foraminiferal14C-based ventilation age estimates from the deep North Pacific have been used to argue the average age of bottom waters during the last glacial maximum was 3000 years, or about 1000 years older than modern. If true, glacial bottom waters would have accumulated additional respired carbon and contributed to the drop in atmospheric CO2. By the same reasoning, ventilation ages that were 1000 years older, would have lost dissolved oxygen and become anaerobic and thereby unable to support epibenthic fauna. The current study re-analyzed the Pacific14C data and finds the glacial ventilation age average is biased by inclusion of data from low sediment accumulation rate cores that have been affected by bioturbation and contaminated with older specimens. Removal of data from cores with sedimentation rates less than 10 cm/ky reduces the old-bias and results in an average ventilation age that is close to the modern ocean.
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