Redox-controlled carbon and phosphorus burial: A mechanism for enhanced organic carbon sequestration during the PETM

Komar, N.; Zeebe, Richard E.

doi:10.1016/j.epsl.2017.09.011

Cited by 28 publications

(55 citation statements)

References 73 publications

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“…Various other forms of organic carbon sequestration may be the cause of the recorded phasing. For example, increased burial of C org may occur on land during eccentricity minima because constant precipitation above peatlands provides conditions for the development of year-round soil anoxia (Kurtz et al, 2003;Zachos et al, 2010). The resulting 13 C-enriched global exogenic carbon pool would be consistent with the phase relation we see in sediment records.…”

Section: Introductionsupporting

confidence: 71%

“…As C org burial is primarily controlled by sediment accumulation (Berner, 1982;Hedges and Keil, 1995;Berner, 2006), the direct topdown control for C org burial would be river runoff, which corresponds to seasonal precipitation patterns (see also Paillard, 2017;Zeebe et al, 2017). Although the exact mechanistic link between eccentricity forcing and sediment deposition remains elusive, we demonstrate that marine C org burial provides an alternative to other proposed mechanisms that link the carbon cycle to astronomical forcing, such as carbon storage in peatland soils (Kurtz et al, 2003), methane hydrate reservoirs, or ice-sheet dynamics (de Boer et al, 2014).…”

Section: Discussionmentioning

confidence: 78%

“…In the original LOSCAR model (version 2.0.4), the biological pump is decoupled from the long carbon cycle described above, meaning that C org that is produced in surface oceans is fully remineralized in the intermediate-and deepocean boxes (see Zeebe, 2012, for a full description). We note that Komar and Zeebe (2017) included a long-term, coupled C org -O 2 -PO 4 feedback in LOSCAR. However, a simplified approach is used here (see below), since our simple forcing does not invoke additional controls on C org burial, such as productivity.…”

Section: Loscar Modelmentioning

confidence: 99%

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The 405 kyr and 2.4 Myr eccentricity components in Cenozoic carbon isotope records

et al. 2019

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Abstract. Cenozoic stable carbon (δ13C) and oxygen (δ18O) isotope ratios of deep-sea foraminiferal calcite co-vary with the 405 kyr eccentricity cycle, suggesting a link between orbital forcing, the climate system, and the carbon cycle. Variations in δ18O are partly forced by ice-volume changes that have mostly occurred since the Oligocene. The cyclic δ13C–δ18O co-variation is found in both ice-free and glaciated climate states, however. Consequently, there should be a mechanism that forces the δ13C cycles independently of ice dynamics. In search of this mechanism, we simulate the response of several key components of the carbon cycle to orbital forcing in the Long-term Ocean-atmosphere-Sediment CArbon cycle Reservoir model (LOSCAR). We force the model by changing the burial of organic carbon in the ocean with various astronomical solutions and noise and study the response of the main carbon cycle tracers. Consistent with previous work, the simulations reveal that low-frequency oscillations in the forcing are preferentially amplified relative to higher frequencies. However, while oceanic δ13C mainly varies with a 405 kyr period in the model, the dynamics of dissolved inorganic carbon in the oceans and of atmospheric CO2 are dominated by the 2.4 Myr cycle of eccentricity. This implies that the total ocean and atmosphere carbon inventory is strongly influenced by carbon cycle variability that exceeds the timescale of the 405 kyr period (such as silicate weathering). To test the applicability of the model results, we assemble a long (∼22 Myr) δ13C and δ18O composite record spanning the Eocene to Miocene (34–12 Ma) and perform spectral analysis to assess the presence of the 2.4 Myr cycle. We find that, while the 2.4 Myr cycle appears to be overshadowed by long-term changes in the composite record, it is present as an amplitude modulator of the 405 and 100 kyr eccentricity cycles.

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Section: Introductionsupporting

confidence: 71%

Section: Discussionmentioning

confidence: 78%

Section: Loscar Modelmentioning

confidence: 99%

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The 405 kyr and 2.4 Myr eccentricity components in Cenozoic carbon isotope records

et al. 2019

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“…The PETM carbon cycle perturbations are unusual both in magnitude and duration, and likely a result of a combination of triggers and feedback mechanisms that are not yet fully understood (McInerney and Wing, 2011; 635 Komar and Zeebe, 2017). Continuous emissions from a light carbon source such as thermogenic degassing around the NAIP could have contributed to the long duration (Svensen et al, 2004;Frieling et al 2016).…”

Section: The Petm Recoverymentioning

confidence: 99%

Rapid and sustained environmental responses to global warming: The Paleocene–Eocene Thermal Maximum in the eastern North Sea

Stokke

Jones

Riber

et al. 2020

Preprint

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Abstract. The Paleocene–Eocene Thermal Maximum (PETM; ~ 55.9 Ma) was a period of rapid and sustained global warming associated with significant carbon emissions. It coincided with the North Atlantic opening and emplacement of the North Atlantic Igneous Province (NAIP), suggesting a possible causal relationship. Only a very limited number of PETM studies exist from the North Sea, despite its ideal position for tracking the impact of both changing climate and the NAIP explosive and effusive activity. Here we present sedimentological, mineralogical, and geochemical proxy data from Denmark in the eastern North Sea, exploring the environmental response to the PETM. An increase in the chemical index of alteration and a kaolinite content up to 50 % of the clay fraction indicate an influx of terrestrial input shortly after the PETM onset and during the recovery, likely due to an intensified hydrological cycle. The volcanically derived minerals zeolite and smectite comprise up to 36 % and 90 % of the bulk and clay mineralogy respectively, highlighting the NAIPs importance as a sediment source for the North Sea and in increasing the rate of silicate weathering during the PETM. XRF element core scans also reveal possible hitherto unknown NAIP ash deposition both prior to and during the PETM. Geochemical proxies show that an anoxic environment persisted during the PETM body, possibly reaching euxinic conditions in the upper half with high concentrations of Mo (> 30 ppm), S (~ 4 wt %), and pyrite (~ 7 % of bulk), and low Th/U (

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“…In the original LOSCAR model (version 2.0.4), the biological pump is decoupled from the long carbon cycle described above, meaning that C org that is produced in surface oceans is fully remineralised in the intermediate and deep ocean boxes (see Zeebe, 2012, for a full description). We note that Komar and Zeebe (2017) included a long-term, coupled C org -O 2 -PO 4 feedback in LOSCAR. However, a simplified approach is used here (see below), since our simple forcing does not invoke additional controls on C org burial, such as productivity.…”

mentioning

confidence: 99%

The 405 kyr and 2.4 Myr eccentricity components in Cenozoic carbon isotope records

Kocken¹,

Cramwinckel²,

Zeebe³

et al. 2018

Preprint

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Redox-controlled carbon and phosphorus burial: A mechanism for enhanced organic carbon sequestration during the PETM

Cited by 28 publications

References 73 publications

The 405 kyr and 2.4 Myr eccentricity components in Cenozoic carbon isotope records

The 405 kyr and 2.4 Myr eccentricity components in Cenozoic carbon isotope records

Rapid and sustained environmental responses to global warming: The Paleocene–Eocene Thermal Maximum in the eastern North Sea

The 405 kyr and 2.4 Myr eccentricity components in Cenozoic carbon isotope records

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