SEALEX — Internal reef chronology and virtual drill logs from a spreadsheet-based reef growth model

Kölling, Martin; Webster, Jody M.; Camoin, Gilbert; Iryu, Yasufumi; Bard, Édouard; Séard, Claire

doi:10.1016/j.gloplacha.2008.07.011

Cited by 20 publications

(19 citation statements)

References 28 publications

(52 reference statements)

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“…γ is the depth‐dependent penalty coefficient, which corresponds to the waning of the photic zone down to depth z max (unlike the tanh function, as in Bosscher and Schlager () or Koelling et al (), we ignore minor contributions at greater depths, that are embedded in the sediments—see below), such that

γ = \frac{1}{2} true(1 + cos \frac{π h (s)}{z_{max}} true),

where h ( s ) is the local depth along the curvilinear profile. At shallower depths than z min (the shallowest few meters where waves are active), the penalty coefficient linearly decreases to 0 at the surface.…”

Section: Modeling Reef Productionmentioning

confidence: 99%

“…We arbitrarily ignore the many competing reconstructed sea level curves (see e.g., the compilation by Caputo ()) and do not consider any uncertainty, as we do not focus on the detailed timing of reef evolution. For the same reason, we do not impose a time‐lag before reef growth resumes to its maximum growth rate (∼0.5 kyr, as in Koelling et al ()). Instead, we analyze the theoretical response to the cyclicity, for which most curves agree upon.…”

Section: Modeling Reef Productionmentioning

confidence: 99%

“…Numerical models attempt to reproduce the morphology of emerged or submerged sequence of fossil coral reefs (e.g., Bosscher & Schlager, 1992;Koelling et al, 2009;Toomey et al, 2013;Turcotte & Bernthal, 1984;Warrlich et al, 2002). We developed a 2-D Fortran numerical code that accounts for depth-dependent reef growth rates, erosion, and sedimentation (available upon request).…”

Section: Modeling Reef Productionmentioning

confidence: 99%

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Reef Carbonate Productivity During Quaternary Sea Level Oscillations

Husson

Pastier

Pedoja

et al. 2018

Geochem Geophys Geosyst

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Global variations in reef productivity during the Quaternary depend on external parameters that may alter the global chemical balance in the oceans and atmosphere. We designed a numerical model that simulates reef growth, erosion, and sedimentation on coastlines undergoing sea level oscillations, and uplift or subsidence. We further develop a probabilistic evaluation that accounts for variable vertical ground motion, erosion, and foundation morphologies. Absolute sea level change appears primordial, as productivity must have increased by an order of magnitude since the onset of the glacial cycles, ∼2.6 Ma. But most important is relative sea level change, i.e., eustasy modulated by uplift or subsidence, that rejuvenates the accommodation space and exposes pristine domains of the shore to active reefs at each cycle. Integrated over the long‐term, vertical land motion sets the pace of reef growth: productivity in tectonically unstable domains is thus expected to be up to 10 times higher than in stable regions, if any. We quantify the global length of reef coasts and the probability density functions for slopes and uplift rates. Productivity waxes during transgressions to reach 2–8 Gt CaCO3/yr and wanes during highstands, which may contribute to increase atmospheric pCO2 by several tens of ppm during deglaciations. Over the last 1.5 Ma, reefs precipitated ∼0.8 × 106 Gt CaCO3 (∼500 × 103 km3), the equivalent of a 1 m‐thick layer spread over the entire surface of the Earth. This production modulates the calcium budget, for it represents some 30% of the modern Ca flux in the ocean.

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γ = \frac{1}{2} true(1 + cos \frac{π h (s)}{z_{max}} true),

Section: Modeling Reef Productionmentioning

confidence: 99%

Section: Modeling Reef Productionmentioning

confidence: 99%

Section: Modeling Reef Productionmentioning

confidence: 99%

See 1 more Smart Citation

Reef Carbonate Productivity During Quaternary Sea Level Oscillations

Husson

Pastier

Pedoja

et al. 2018

Geochem Geophys Geosyst

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“…Although simple numerical reef models (e.g., Bosence and Waltham, 1990;Chappell, 1980;Koelling et al, 2009;Paulay and McEdward, 1990) have been widely used to explore the dominant controls on the morphology of reef-bound volcanic islands during the late Pleistocene, a lack of late Miocene (and earlier) sea-level records has limited similar application to atolls. Here we use a simple numerical model to explore the most likely sea-level histories since the late Miocene (b 8.5 Ma) that are consistent with observed core stratigraphy from Enewetak Atoll.…”

Section: Introductionmentioning

confidence: 99%

Late Cenozoic sea level and the rise of modern rimmed atolls

Toomey

Ashton

Raymo

et al. 2016

Palaeogeography, Palaeoclimatology, Palaeoecology

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Sea-level records from atolls, potentially spanning the Cenozoic, have been largely overlooked, in part because the processes that control atoll form (reef accretion, carbonate dissolution, sediment transport, vertical motion) are complex and, for many islands, unconstrained on million-year timescales. Here we combine existing observations of atoll morphology and corelog stratigraphy from Enewetak Atoll with a numerical model to (1) constrain the relative rates of subsidence, dissolution and sedimentation that have shaped modern Pacific atolls and (2) construct a record of sea level over the past 8.5 million years. Both the stratigraphy from Enewetak Atoll (constrained by a subsidence rate of~20 m/Myr) and our numerical modeling results suggest that low sea levels (50-125 m below present), and presumably bi-polar glaciations, occurred throughout much of the late Miocene, preceding the warmer climate of the Pliocene, when sea level was higher than present. Carbonate dissolution through the subsequent sea-level fall that accompanied the onset of large glacial cycles in the late Pliocene, along with rapid highstand constructional reef growth, likely drove development of the rimmed atoll morphology we see today.Published by Elsevier B.V.

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“…Many previous studies have introduced numerical models of reef profi le development (Bosence and Waltham, 1990;Bosscher and Schlager, 1992;Chappell, 1980;Hill et al, 2009;Koelling et al, 2009;Paterson et al, 2006;Paulay and McEdward, 1990;Warrlich et al, 2002;Webster et al, 2007). In general, these models have related reef morphology at specifi c sites to rates of island subsidence, reef accretion, and sea-level rise, but do not satisfactorily explain the wide range of morphologic variability observed in modern reefs.…”

Section: Introductionmentioning

confidence: 99%

Profiles of ocean island coral reefs controlled by sea-level history and carbonate accumulation rates

Toomey

Ashton

Perron

2013

Geology

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Modern and preserved coral reefs on islands exhibit a broad range of forms, from actively accreting fringing and barrier reefs to terraces preserved by drowning or subaerial exposure. Darwin's canonical model of reef development proposes an evolutionary sequence of reef forms as a volcanic island ages and subsides, from fringing reef to lagoon-bounding barrier reef to atoll. Compiled data from modern systems show, however, that many islands do not follow this sequence, implying that reefs are shaped by more than island subsidence alone. We show that the diversity of modern reef morphology arises from the combined effects of island subsidence, coral growth, and glacial sea-level cycles. A model for the evolution of a reef elevation profi le over the past 400 k.y. reveals that different combinations of reef accretion rate and island vertical motion produce a variety of forms that matches the observed distribution of modern reefs. This match occurs only if the model is driven by Pleistocene sea-level oscillations-few modern environments have the right combination of conditions to produce the Darwinian atoll progression.

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SEALEX — Internal reef chronology and virtual drill logs from a spreadsheet-based reef growth model

Cited by 20 publications

References 28 publications

Reef Carbonate Productivity During Quaternary Sea Level Oscillations

Reef Carbonate Productivity During Quaternary Sea Level Oscillations

Late Cenozoic sea level and the rise of modern rimmed atolls

Profiles of ocean island coral reefs controlled by sea-level history and carbonate accumulation rates

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