Late Cretaceous–Neogene trends in deep ocean temperature and continental ice volume: Reconciling records of benthic foraminiferal geochemistry (<i>δ</i><sup>18</sup>O and Mg/Ca) with sea level history

Cramer, Benjamin; Miller, Kenneth G.; Barrett, P. J.; Wright, James D.

doi:10.1029/2011jc007255

Cited by 255 publications

(410 citation statements)

References 149 publications

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“…We explored alternative histories of seawater  18 O and deep-water temperature (Schrag et al, 1995;Cramer et al, 2011) and found differences were negligible and do not effect our conclusions. This is because, to first order, these histories are similar.…”

Section: Cenozoic History Of Ocean  18 O Values and Deep-water Tempementioning

confidence: 95%

Modeling the effects of diagenesis on carbonate clumped-isotope values in deep- and shallow-water settings

Stolper

Eiler

Higgins

2018

Geochimica et Cosmochimica Acta

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. O values provides new constraints on both the diagenetic history of deep-sea settings as well as past equatorial sea-surface temperatures. Specifically, the combination of the diagenetic model and data support previous work that indicates equatorial sea-surface temperatures were warmer in the Paleogene as compared to today. We then explore whether the model is applicable to shallow-water settings commonly preserved in the rock record. Using a previously published dataset from the Bahamas, we demonstrate that the model captures the main trends of the data as a function of burial depth and thus appears applicable to a range of depositional settings.

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Section: Cenozoic History Of Ocean  18 O Values and Deep-water Tempementioning

confidence: 95%

Modeling the effects of diagenesis on carbonate clumped-isotope values in deep- and shallow-water settings

Stolper

Eiler

Higgins

2018

Geochimica et Cosmochimica Acta

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“…We calculate an H value of 20 for Paleogene planktic foraminifera, which is significantly lower than H values for modern planktics, such as Globigerina sacculifer (H = 0.42; Hasuik and Lohmann, 2010). For benthic foraminifera, Cramer et al (2011) values is…”

Section: Elemental Geochemistry and Mg / Ca Analysismentioning

confidence: 99%

The Paleocene–Eocene Thermal Maximum at DSDP Site 277, Campbell Plateau, southern Pacific Ocean

et al. 2015

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Abstract. Re-examination of sediment cores from Deep Sea Drilling Project (DSDP) Site 277 on the western margin of the Campbell Plateau (paleolatitude of ∼ 65 • S) has identified an intact Paleocene-Eocene (P-E) boundary overlain by a 34 cm thick record of the Paleocene-Eocene Thermal Maximum (PETM) within nannofossil chalk. The upper part of the PETM is truncated, either due to drilling disturbance or a sedimentary hiatus. An intact record of the onset of the PETM is indicated by a gradual decrease in δ 13 C values over 20 cm, followed by a 14 cm interval in which δ 13 C is 2 ‰ lighter than uppermost Paleocene values. After accounting for effects of diagenetic alteration, we use δ 18 O and Mg / Ca values from foraminiferal tests to determine that intermediate and surface waters warmed by ∼ 5-6 • at the onset of the PETM prior to the full development of the negative δ 13 C excursion. After this initial warming, sea temperatures were relatively stable through the PETM but declined abruptly across the horizon that truncates the event at this site. Mg / Ca analysis of foraminiferal tests indicates peak intermediate and surface water temperatures of ∼ 19 and ∼ 32 • C, respectively. These temperatures may be influenced by residual diagenetic factors and changes in ocean circulation, and surface water values may also be biased towards warm-season temperatures.

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“…2, come from three methods: (i) gas bubbles trapped in ice cores [0-550 kya (6-8)]; (ii) the carbon isotopic composition of sedimentary alkenones recovered from deep-sea sediments-the fractionation between alkenones and total dissolved carbon in seawater is largely a function of [CO 2 ] aq [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]]; and (iii) the boron isotopic composition of planktic foraminifera from deepsea sediments, which depends on pH (e.g., ref. 14), from which [CO 2 ] aq and atmospheric CO 2 can be calculated [11][12][13][14][15][16][17][33][34][35][36]].…”

mentioning

confidence: 99%

“…1 and 2: (i) changes in the oxygen isotopic composition of foraminifera and bulk carbonate from Red Sea sediments, which predominantly record sea level [Pleistocene, 0-550 kya (24-25)]; (ii) backstripping of marginal sediments combined with estimates of paleowater depth based on detailed lithofacies, ichnological, and benthic foraminiferal analyses [Pliocene (2.7-3.2 Ma) and EoceneOligocene (20-38 Ma) (26,27)]; and (iii) sea-level change reconstructed using Mg/Ca of foraminifera to isolate the ice-volume signal from foraminiferal δ 18 O. Because of uncertainties in the Mg/Ca of seawater (see ref.…”

mentioning

confidence: 99%

“…Because of uncertainties in the Mg/Ca of seawater (see ref. 27 and references therein), we calculate only relative sea-level records using this approach and pin them to either a highstand from backstripping [Miocene (11-17 Ma) (28)] or an estimate of an ice-free world [+64 m; EoceneOligocene (33-36 Ma)]. Other sea-level records are available for these time periods, and there generally is a good agreement among different methodologies for the same time period, which provides a high degree of confidence in the reconstructions ( Fig S2 and ref.…”

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confidence: 99%

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Relationship between sea level and climate forcing by CO ₂ on geological timescales

Foster

Rohling

2013

Proc. Natl. Acad. Sci. U.S.A.

129

113

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On 10 3 -to 10 6 -year timescales, global sea level is determined largely by the volume of ice stored on land, which in turn largely reflects the thermal state of the Earth system. Here we use observations from five well-studied time slices covering the last 40 My to identify a well-defined and clearly sigmoidal relationship between atmospheric CO 2 and sea level on geological (near-equilibrium) timescales. This strongly supports the dominant role of CO 2 in determining Earth's climate on these timescales and suggests that other variables that influence long-term global climate (e.g., topography, ocean circulation) play a secondary role. The relationship between CO 2 and sea level we describe portrays the "likely" (68% probability) long-term sea-level response after Earth system adjustment over many centuries. Because it appears largely independent of other boundary condition changes, it also may provide useful long-range predictions of future sea level. For instance, with CO 2 stabilized at 400-450 ppm (as required for the frequently quoted "acceptable warming" of 2°C), or even at AD 2011 levels of 392 ppm, we infer a likely (68% confidence) long-term sea-level rise of more than 9 m above the present. Therefore, our results imply that to avoid significantly elevated sea level in the long term, atmospheric CO 2 should be reduced to levels similar to those of preindustrial times.S ea-level change is one of the most significant and long-lasting consequences of anthropogenic climate change (1). However, accurate forecasting of the future magnitude of sea-level change is difficult because current numerical climate models lack the capacity to accurately resolve the dynamical processes that govern size changes of continental ice sheets [e.g., total disappearance of the current continental ice sheets would raise mean sea level by about 70 m (1)]. This complicates long-range sea-level projections because the retreat of continental ice sheets will increasingly contribute to sea-level rise as the 21st century progresses (2), and because this rise will continue long into the future, even if temperatures were stabilized, according to different mitigation scenarios for greenhouse gas emissions (1). Because of the absence of adequate ice-dynamical processes in models, even the most recent estimates have to rely on assumed (linear) relationships between ice-volume reduction and global mean temperature increase (1), which as yet remain largely untested. Therefore, here we provide a natural context to projections of future long-term (multicentury) sea-level rise, by assessing key relationships in the Earth's climate system using recent high-quality data from the geological past. Because global mean temperature is hard to measure in the geological past without applying (often problematic) assumptions about polar amplification or deep-sea temperature relationships (3, 4), we instead concentrate on quantifying the "likely" [68% probability (5)] long-term relationship between two entities that can be measured more directly, namely i...

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Late Cretaceous–Neogene trends in deep ocean temperature and continental ice volume: Reconciling records of benthic foraminiferal geochemistry (δ¹⁸O and Mg/Ca) with sea level history

Cited by 255 publications

References 149 publications

Modeling the effects of diagenesis on carbonate clumped-isotope values in deep- and shallow-water settings

Modeling the effects of diagenesis on carbonate clumped-isotope values in deep- and shallow-water settings

The Paleocene–Eocene Thermal Maximum at DSDP Site 277, Campbell Plateau, southern Pacific Ocean

Relationship between sea level and climate forcing by CO ₂ on geological timescales

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Late Cretaceous–Neogene trends in deep ocean temperature and continental ice volume: Reconciling records of benthic foraminiferal geochemistry (δ18O and Mg/Ca) with sea level history

Cited by 255 publications

References 149 publications

Modeling the effects of diagenesis on carbonate clumped-isotope values in deep- and shallow-water settings

Modeling the effects of diagenesis on carbonate clumped-isotope values in deep- and shallow-water settings

The Paleocene–Eocene Thermal Maximum at DSDP Site 277, Campbell Plateau, southern Pacific Ocean

Relationship between sea level and climate forcing by CO 2 on geological timescales

Contact Info

Product

Resources

About

Late Cretaceous–Neogene trends in deep ocean temperature and continental ice volume: Reconciling records of benthic foraminiferal geochemistry (δ¹⁸O and Mg/Ca) with sea level history

Relationship between sea level and climate forcing by CO ₂ on geological timescales