Astronomical Time Keeping of Earth History: An Invaluable Contribution of Scientific Ocean Drilling

Littler, Kate; Westerhold, Thomas; Drury, Anna Joy; Liebrand, Diederik; Lisiecki, L. E.; Pälike, Heiko

doi:10.5670/oceanog.2019.122

Cited by 8 publications

(8 citation statements)

References 43 publications

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“…The most prominent and stable astronomical cycle is the 405-kyr eccentricity cycle, which is driven by the planetary perturbations caused by Venus and Jupiter (70). Cenozoic deep-sea foraminifer stable carbon isotope records are predominantly imprinted by this cycle (71) suggesting a tight link between orbital forcing and the climate system, likely due to intricate feedback mechanisms in the carbon cycle (30,72).…”

Section: Astrochronologymentioning

confidence: 99%

“…Cenozoic deep-sea foraminifer stable carbon isotope records are predominantly imprinted by this cycle (71) suggesting a tight link between orbital forcing and the climate system, likely due to intricate feedback mechanisms in the carbon cycle (30,72). Most of the orbital cycles experience marked changes in their periodicity and phasing due to the dissipative effect of the Earth-Moon system, friction, dynamic changes in the distribution of masses in the Earth and on Earths' surface, as well as chaotic diffusion of the Solar System (14,66,70,73). Therefore, numerical solutions for precession and obliquity can only provide accurate targets back to about 10 to 20 Ma (74,75), and usable targets back to 40 Ma (70).…”

Section: Astrochronologymentioning

confidence: 99%

“…Accurate tuning to numerical solutions of eccentricity are limited by the chaotic behavior of the inner Solar System planets and the largest bodies in the asteroid belt (14,70). Recent orbital solutions (14,76) are valid from 0 to ~54 Ma for all eccentricity components, whereas only the 405-kyr eccentricity cycle is stable and can be used for astronomical tuning back to 200 Ma (14,66,77).…”

Section: Astrochronologymentioning

confidence: 99%

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An astronomically dated record of Earth’s climate and its predictability over the last 66 million years

Westerhold

Marwan

Drury

et al. 2020

Science

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Much of our understanding of Earth’s past climate comes from the measurement of oxygen and carbon isotope variations in deep-sea benthic foraminifera. Yet, long intervals in existing records lack the temporal resolution and age control needed to thoroughly categorize climate states of the Cenozoic era and to study their dynamics. Here, we present a new, highly resolved, astronomically dated, continuous composite of benthic foraminifer isotope records developed in our laboratories. Four climate states—Hothouse, Warmhouse, Coolhouse, Icehouse—are identified on the basis of their distinctive response to astronomical forcing depending on greenhouse gas concentrations and polar ice sheet volume. Statistical analysis of the nonlinear behavior encoded in our record reveals the key role that polar ice volume plays in the predictability of Cenozoic climate dynamics.

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Section: Astrochronologymentioning

confidence: 99%

Section: Astrochronologymentioning

confidence: 99%

Section: Astrochronologymentioning

confidence: 99%

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An astronomically dated record of Earth’s climate and its predictability over the last 66 million years

Westerhold

Marwan

Drury

et al. 2020

Science

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1,222

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“…A recently published review in Oceanography focused on how scientific ocean drilling of marine sedimentary records from the Antarctic continental margin has revolutionized understanding of the past behavior of the Antarctic Ice Sheet (Escutia et al, 2019). The ice proximal records discussed provide critical data in support of far-field records, which track the pacing of ice sheet change through changes in global ice volume and sea level, and also provide information on the climate drivers that caused these changes (e.g., Littler et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

The Antarctic Ice Sheet: A Paleoclimate Modeling Perspective

Gasson

Keisling

2020

Oceanog

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“…Over the last 30 Million years (Myr), Earth's climate system evolved considerably from the early unipolar Antarctic icehouse to our modern-day bipolar world (Zachos et al, 2001;De Vleeschouwer et al, 2017;Littler et al, 2019). Inferred from benthic foraminiferal oxygen isotope data (d 18 O), the Oligocene-early Miocene (30-17 million years ago [Ma]) was characterized by variable Antarctic ice sheets.…”

Section: Introductionmentioning

confidence: 99%

Climate, cryosphere and carbon cycle controls on Southeast Atlantic orbital-scale carbonate deposition since the Oligocene (30–0 Ma)

Drury¹,

Liebrand²,

Westerhold³

et al. 2020

Preprint

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Abstract. The evolution of the Cenozoic Icehouse over the past 30 million years (Myr) from a unipolar to a bipolar world is broadly known; however, the exact development of orbital-scale climate variability is less well understood. Highly resolved records of carbonate (CaCO3) content provide insight into the evolution of regional and global climate, cryosphere and carbon cycle dynamics. Here, we generate the first Southeast Atlantic CaCO3 content record spanning the last 30 Myr, derived from X-ray fluorescence (XRF) ln(Ca/Fe) data collected at Ocean Drilling Program Site 1264 (Angola Basin side of the Walvis Ridge, SE Atlantic Ocean). We present a comprehensive and continuous depth and age model for the entirety of Site 1264 (~316 m; 30 Myr), which constitutes a key reference framework for future palaeoclimatic and palaeoceanographic studies at this site. We identify three phases with distinctly different orbital controls on Southeast Atlantic CaCO3 deposition, corresponding to major developments in climate, the cryosphere and/or the carbon cycle: 1) strong ~110 kyr eccentricity pacing prevails during Oligo-Miocene global warmth (~30–13 Ma); 2) increased eccentricity-modulated precession pacing appears after the mid Miocene Climate Transition (mMCT) (~14–8 Ma); 3) strong obliquity pacing appears in the late Miocene (~7.7–3.3 Ma) following the increasing influence of high-latitude processes. The lowest CaCO3 content (92–94 %) occur between 18.5–14.5 Ma, potentially reflecting dissolution caused by widespread early Miocene warmth and preceding Antarctic deglaciation across the Miocene Climate Optimum (~17–14.5 Ma) by 1.5 Myr. The emergence of precession-pacing of CaCO3 deposition at Site 1264 after ~14 Ma could signal a reorganisation of surface and/or deep-water circulation in this region following Antarctic reglaciation at the mMCT. The increased sensitivity to precession at Site 1264 is associated with an increase in mass accumulation rates (MARs) and reflects increased regional CaCO3 productivity and/or an influx of cooler, less corrosive deep-waters. The highest %CaCO3 and MARs indicate the late Miocene Biogenic Bloom (LMBB) occurs between ~7.8–3.3 Ma at Site 1264, which is broadly, but not exactly, contemporaneous with the LMBB in the equatorial Pacific Ocean. The global expression of the LMBB may reflect an increased nutrient input into the global ocean resulting from enhanced aeolian dust and/or glacial/chemical weathering fluxes. Regional variability in the timing and amplitude of the LMBB may be driven by regional differences in cooling, continental aridification and/or changes in ocean circulation in the late Miocene.

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Astronomical Time Keeping of Earth History: An Invaluable Contribution of Scientific Ocean Drilling

Cited by 8 publications

References 43 publications

An astronomically dated record of Earth’s climate and its predictability over the last 66 million years

An astronomically dated record of Earth’s climate and its predictability over the last 66 million years

The Antarctic Ice Sheet: A Paleoclimate Modeling Perspective

Climate, cryosphere and carbon cycle controls on Southeast Atlantic orbital-scale carbonate deposition since the Oligocene (30–0 Ma)

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