The surface expression of radiocarbon anomalies near Baja California during deglaciation

Lindsay, C. M.; Lehman, Scott J.; Marchitto, Thomas M.; Ortiz, Joseph D.

doi:10.1016/j.epsl.2015.04.012

Cited by 26 publications

(72 citation statements)

References 52 publications

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“…Specifically, gradually increasing ventilation early in HS1 (∼17.5 ka) followed by an abrupt acceleration in the rate of ventilation coincident with the ∼14.8 ka rise in atmospheric CO 2 is recorded in the EEP (this study), the subtropical NE Pacific1011, the subpolar NE Pacific9, the Equatorial Atlantic16, the North Atlantic141517 and the subpolar South Atlantic13. Among these records, the EEP (this study), the subtropical NE Pacific1011, and the North Atlantic1417 also indicate a period of enhanced ventilation during the late Younger Dryas (Fig. 7).…”

Section: Discussionsupporting

confidence: 56%

“…However, during this period our record has insufficient resolution to identify the presence of a distinct EEP ventilation event associated with the rapid 100–200 year long increase in CO 2 at ∼11.7 ka. Nevertheless, a significant rapid increase in Δ 14 C 0-atm is recorded at this time in intermediate depth waters off Baja, CA, USA1011 supporting a link between ocean ventilation and the centennial scale CO 2 rise at ∼11.7 ka.…”

Section: Discussionmentioning

confidence: 67%

“…( c ) The location of marine records displayed in Fig. 7 including TR163-23 (this study) shown with a star, ODP1240 (0.01°N, 86.46°W; 2,921 m)18 in grey, MD02–2489 (54.39°N, 148.92°W; 3,640 m)9 in pink, MV99-MC19/GC31/PC08 (23.47° N, 111.6°W; 705 m)1011 in dark green, Drake Passage corals12 in light blue, MD07–3076 (44.07°S, 14.21°W; 3,770 m)13 in light purple, a transect of S. Iceland cores (1,200–2,300 m)14 in dark blue, northwest Atlantic corals15 in orange, equatorial Atlantic corals16 in dark purple, and eastern North Atlantic core MD99–2334k (37.8°N, 10.17°W; 3,146 m)17 in light green.…”

Section: Figurementioning

confidence: 90%

“…Previous studies from both intermediate and deep water locations yield conflicting results regarding the magnitude and extent of the glacial carbon pool, as well as the timing of deglacial ventilation events9101112131415161718192021222324252627, resulting in difficulty resolving both regional and inter-ocean ventilation signals. These inconsistencies may be due, at least in part, to the age models used for the different records.…”

mentioning

confidence: 99%

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Synchronous deglacial thermocline and deep-water ventilation in the eastern equatorial Pacific

Umling

Thunell

2017

Nat Commun

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The deep ocean is most likely the primary source of the radiocarbon-depleted CO2 released to the atmosphere during the last deglaciation. While there are well-documented millennial scale Δ14C changes during the most recent deglaciation, most marine records lack the resolution needed to identify more rapid ventilation events. Furthermore, potential age model problems with marine Δ14C records may obscure our understanding of the phase relationship between inter-ocean ventilation changes. Here we reconstruct changes in deep water and thermocline radiocarbon content over the last deglaciation in the eastern equatorial Pacific (EEP) using benthic and planktonic foraminiferal 14C. Our records demonstrate that ventilation of EEP thermocline and deep waters occurred synchronously during the last deglaciation. In addition, both gradual and rapid deglacial radiocarbon changes in these Pacific records are coeval with changes in the Atlantic records. This in-phase behaviour suggests that the Southern Ocean overturning was the dominant driver of changes in the Atlantic and Pacific ventilation during deglaciation.

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Section: Discussionsupporting

confidence: 56%

Section: Discussionmentioning

confidence: 67%

Section: Figurementioning

confidence: 90%

mentioning

confidence: 99%

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Synchronous deglacial thermocline and deep-water ventilation in the eastern equatorial Pacific

Umling

Thunell

2017

Nat Commun

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“…Later work using the same cores suggest that old intermediate water was also present in the late Bølling-Allerød warm period (BA), and that G. ruber recorded seasonal upwelling of old subsurface water transported from the EEP northward by the California Undercurrent ( Fig. 2.2) (Lindsay et al, 2015). Older intermediate ventilation ages during the deglaciation have also been noted near the Galapagos Islands (Stott et al, 2009), although this has been questioned (Stott and Timmermann, 2011).…”

Section: Resultsmentioning

confidence: 98%

Reconstructing deglacial ocean ventilation using radiocarbon : data and inverse modeling

Zhao¹

2017

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New constraints on deglacial marine radiocarbon anomalies from a depth transect near Baja California

et al. 2016

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Previous studies have shown that radiocarbon activities (Δ14C) in the low‐latitude, middepth Pacific and Indian Oceans were anomalously low during Heinrich Stadial 1 (HS1, ~17.8–14.6 ka) and the Younger Dryas (YD, ~12.8–11.5 ka), coincident with intervals of rising atmospheric CO2 concentration and declining atmospheric Δ14C. However, a full explanation of these events remains elusive due to sparse and sometimes conflicting data. Here we present new 14C measurements on benthic and planktic foraminifera that, in combination with previously published measurements, enable us to reconstruct the Δ14C depth gradient near Baja California. Vertical profiles were similar to present during the Last Glacial Maximum and Bølling/Allerod (14.6–12.8 ka) but display a pronounced middepth (~700 m) Δ14C minimum during HS1 and the YD. The latter observation, along with a comparison to other regional reconstructions, appears to rule out intermediate waters from the north or from directly below as proximate sources of aged 14C‐depleted ocean carbon during deglaciation and point instead to changes in the composition of Equatorial Pacific intermediate waters. Simple mixing constraints require Equatorial Pacific intermediate waters to be only slightly lower in Δ14C than at Baja California, in contrast with previous observations of extremely low Δ14C at Galapagos Rise. While the latter may have been influenced by localized releases of geologic (14C‐dead) CO2, the smaller and more widespread deglacial Δ14C anomalies in the Arabian Sea and North Pacific seem to require a source of aged carbon in the glacial deep Southern and Pacific Oceans for which there is growing evidence.

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The surface expression of radiocarbon anomalies near Baja California during deglaciation

Cited by 26 publications

References 52 publications

Synchronous deglacial thermocline and deep-water ventilation in the eastern equatorial Pacific

Synchronous deglacial thermocline and deep-water ventilation in the eastern equatorial Pacific

Reconstructing deglacial ocean ventilation using radiocarbon : data and inverse modeling

New constraints on deglacial marine radiocarbon anomalies from a depth transect near Baja California

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