Cretaceous sea-surface temperature evolution: Constraints from TEX86 and planktonic foraminiferal oxygen isotopes

O'Brien, Charlotte L; Robinson, Stuart A.; Pancost, Richard D.; Damsté, Jaap S. Sinninghe; Schouten, Stefan; Lunt, Daniel J.; Alsenz, Heiko; Bornemann, André; Bottini, Cinzia; Brassell, Simon C.; Farnsworth, Alexander; Forster, Astrid; Huber, Brian T.; Inglis, Gordon N.; Jenkyns, Hugh C.; Linnert, Christian; Littler, Kate; Markwick, Paul J.; McAnena, A.; Mutterlose, Jörg; Naafs, B. David A.; Püttmann, Wilhelm; Sluijs, Appy; Helmond, Niels A. G. M. van; Vellekoop, Johan; Wagner, Thomas; Wrobel, Neil

doi:10.1016/j.earscirev.2017.07.012

Cited by 367 publications

(257 citation statements)

References 230 publications

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“…We also carry out the same process using a combined 18 O and TEX 86 data set (supporting information Figure S11), using TEX 86 estimates compiled in O'Brien et al (2017;their Figure 9b), Inglis et al (2015), and Cramwinckel et al (2018), using a linear calibration (supporting information Figures S11a-S11c) and an exponential calibration (supporting information Figures S11c and S11d). This results in inferred temperatures with more variation across different sites than those from solely 18 O, and in particular several sites give very warm inferred temperatures during the Eocene, especially those from the southwest Pacific sector of the Southern Ocean (e.g., ODP Site 1172, Hampden Beach, IODP Site 1356).…”

Section: Model Evaluation: Inference Of Global Mean Temperature From mentioning

confidence: 99%

Climate Sensitivity on Geological Timescales Controlled by Nonlinear Feedbacks and Ocean Circulation

Farnsworth

Lunt

O'Brien

et al. 2019

Geophysical Research Letters

105

131

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Climate sensitivity is a key metric used to assess the magnitude of global warming given increased CO2 concentrations. The geological past can provide insights into climate sensitivity; however, on timescales of millions of years, factors other than CO2 can drive climate, including paleogeographic forcing and solar luminosity. Here, through an ensemble of climate model simulations covering the period 150–35 million years ago, we show that climate sensitivity to CO2 doubling varies between ∼3.5 and 5.5 °C through this time. These variations can be explained as a nonlinear response to solar luminosity, evolving surface albedo due to changes in ocean area, and changes in ocean circulation. The work shows that the modern climate sensitivity is relatively low in the context of the geological record, as a result of relatively weak feedbacks due to a relatively low CO2 baseline, and the presence of ice and relatively small ocean area in the modern continental configuration.

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Section: Model Evaluation: Inference Of Global Mean Temperature From mentioning

confidence: 99%

Climate Sensitivity on Geological Timescales Controlled by Nonlinear Feedbacks and Ocean Circulation

Farnsworth

Lunt

O'Brien

et al. 2019

Geophysical Research Letters

105

131

View full text Add to dashboard Cite

show abstract

“…The Cretaceous Period (~145–66 Ma) was characterized by a greenhouse climate (Hay, , and references therein), with elevated atmospheric CO 2 levels (e.g., Foster et al, ; Naafs et al, ), high sea surface temperatures (e.g., Bice et al, ; Naafs & Pancost, ; O'Brien et al, ; Schouten et al, ), and little or no continental ice (Huber et al, ; MacLeod et al, ). Superimposed on this general greenhouse climate are the oceanic anoxic events (OAEs).…”

Section: Introductionmentioning

confidence: 99%

Astronomically Driven Variations in Depositional Environments in the South Atlantic During the Early Cretaceous

Behrooz

Naafs

Dickson

et al. 2018

Paleoceanog and Paleoclimatol

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The extent and persistence of anoxia in the South Atlantic Ocean during its early opening phase in the Early Cretaceous is not well constrained, hindering a holistic understanding of the processes and mechanisms that drive past changes in water column redox conditions, as well as the impacts of such changes on marine ecosystems. Here we provide high‐resolution geochemical records from Deep Sea Drilling Project Site 364 that document variations in redox conditions, chemocline depth, marine productivity, and marine ecosystem dynamics in the northern South Atlantic during the Aptian. We show that many of these parameters varied across discrete sedimentary cycles expressed in the Deep Sea Drilling Project 364 succession. Our data indicate that during the initial stages of basin development, anoxic and euxinic conditions were prevalent and occasionally extended into the upper water column. However, strong cyclicity in sedimentological and geochemical parameters imply that the anoxia/euxinia was not a persistent state. We argue that the water column redox conditions during the Aptian were driven by changes in the hydrological cycle, induced by variations in astronomical forcing. We suggest that the episodically amplified hydrological cycle not only enhanced nutrient availability and marine productivity, but might also have caused density‐driven upper ocean stratification. The presence of black shales of similar age in other ocean basins suggests that this mechanism is broadly important for the formation of Early Cretaceous organic‐rich successions.

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“…Paleoclimate reconstructions, however, can be used to assess the sensitivity of the Earth's climate system to changes of different forcing parameters (e.g., CO 2 ) and to test the reliability of climate models by evaluating their simulations for conditions very different from the modern climate. In this context, not only high-resolution studies of the most recent (Holocene) climate history are of importance but also detailed studies of the earlier Earth history characterized by a much warmer (Greenhouse-type) global climate with elevated atmospheric CO 2 concentrations, such as the Late Cretaceous and the Paleogene (Hong & Lee, 2012;Kent & Muttoni, 2013;O'Brien et al, 2017;Zachos et al, 2008). A precise knowledge of rates and scales of past climate change are the only mode to separate natural and anthropogenic forcings and will enable us to further increase the reliability of climate change predictions.…”

Section: Recent Arctic Climate Change Future Predictions and Paleormentioning

confidence: 99%

The Late Mesozoic‐Cenozoic Arctic Ocean Climate and Sea Ice History: A Challenge for Past and Future Scientific Ocean Drilling

Stein

2019

Paleoceanog and Paleoclimatol

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Over the past 3-4 decades, coincident with global warming and atmospheric CO 2 increase, Arctic sea ice has significantly decreased in its extent as well as in thickness. When extrapolating this alarming trend, the central Arctic Ocean might become ice-free during summers within about the next 2-5 decades. Paleoclimate records allow us to better understand the processes controlling modern climate change and distinguish between natural and anthropogenic forcing. In this context, detailed studies of the earlier Earth history characterized by a much warmer global climate with elevated atmospheric CO 2 concentrations are important. The main focus of this review paper is the long-term late Mesozoic-Cenozoic Arctic Ocean climate history from Greenhouse to Icehouse conditions, with special emphasis on Arctic sea ice history. Starting with some information on the Cretaceous Arctic Ocean climate, this paper will concentrate on selected results from Integrated Ocean Drilling Program (IODP) Expedition 302 (Arctic Ocean Coring Expedition (ACEX)), the first scientific drilling in the permanently ice-covered Arctic Ocean, dealing with the Cenozoic climate history. While these results from ACEX were unprecedented, key questions related to the Cenozoic Arctic climate history remain unanswered, largely due to the major mid-Cenozoic hiatus (if existing) and partly to the poor recovery of the ACEX record. Following-up ACEX and its cutting-edge science, a second scientific drilling on Lomonosov Ridge with a focus on the reconstruction of the continuous and complete Cenozoic Arctic Ocean climate history has currently been proposed and scheduled as IODP Expedition 377 for 2021.

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Cretaceous sea-surface temperature evolution: Constraints from TEX86 and planktonic foraminiferal oxygen isotopes

Cited by 367 publications

References 230 publications

Climate Sensitivity on Geological Timescales Controlled by Nonlinear Feedbacks and Ocean Circulation

Climate Sensitivity on Geological Timescales Controlled by Nonlinear Feedbacks and Ocean Circulation

Astronomically Driven Variations in Depositional Environments in the South Atlantic During the Early Cretaceous

The Late Mesozoic‐Cenozoic Arctic Ocean Climate and Sea Ice History: A Challenge for Past and Future Scientific Ocean Drilling

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