Synchronous records of pCO(2) and Delta C-14 suggest rapid, ocean-derived pCO(2) fluctuations at the onset of Younger Dryas

Steinthorsdottir, Margret (author): Stockholms universitet,Institutionen för geologiska vetenskaper

de Boer, Agatha M. (author): Stockholms universitet,Institutionen för geologiska vetenskaper

Oliver, Kevin I. C. (author)

Muschitiello, Francesco (author): Stockholms universitet,Institutionen för geologiska vetenskaper

Blaauw, Maarten (author)

Reimer, Paula J. (author)

Wohlfarth, Barbara (author): Stockholms universitet,Institutionen för geologiska vetenskaper

(creator_code:org_t)

Elsevier BV, 2014
2014
English.
In: Quaternary Science Reviews. - : Elsevier BV. - 0277-3791 .- 1873-457X. ; 99, s. 84-96

Related links:: https://urn.kb.se/re...; show more...; https://doi.org/10.1...; show less...

Abstract Subject headings

Just before the onset of the Younger Dryas (YD) cold event, several stomatal proxy-based pCO(2) records have shown a sharp increase in atmospheric CO2 concentration (pCO(2)) of between ca 50 and 100 ppm, followed by a rapid decrease of similar or even larger magnitude. Here we compare one of these records, a high-resolution pCO(2) record from southern Sweden, with the IntCal13 record of radiocarbon (Delta C-14). The two records show broadly synchronous fluctuations at the YD onset. Specifically, the IntCal13 record documents decreasing Delta C-14 just before the YD onset when pCO(2) peaks, consistent with a source of old CO2 from the deep ocean. We propose that this fluctuation occurred due to a major ocean flushing event. The cause of the flushing event remains speculative but could be related to the hypothesis of the glacial ocean as a thermobaric capacitor. We confirm that the earth system can produce such large multi-decadal timescale fluctuations in pCO(2) through simulating an artificial ocean flushing event with the GENIE Earth System Model. We suggest that sharp transitions of pCO(2) may have remained undetected so far in ice cores due to inter-firn gas exchange and time-averaging. The stomatal proxy record is a powerful complement to the ice core records for the study of rapid climate change.

NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)

By the author/editor: Steinthorsdottir ...; de Boer, Agatha ...; Oliver, Kevin I. ...; Muschitiello, Fr ...; Blaauw, Maarten; Reimer, Paula J.; show more...; Wohlfarth, Barba ...; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Physical Geograp ...

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