Trends, Rhythms, and Aberrations in Global Climate 65 Ma to Present
This work focuses primarily on the periodic and anomalous components of variability over the early portion of this era, as constrained by the latest generation of deep-sea isotope records.
An early Cenozoic perspective on greenhouse warming and carbon-cycle dynamics
Past episodes of greenhouse warming provide insight into the coupling of climate and the carbon cycle and thus may help to predict the consequences of unabated carbon emissions in the future.
Marked Decline in Atmospheric Carbon Dioxide Concentrations During the Paleogene
- M. Pagani, J. Zachos, K. Freeman, B. Tipple, S. Bohaty
- Environmental Science, GeographyScience
- 22 July 2005
Stable carbon isotopic values of di-unsaturated alkenones extracted from deep sea cores are used to reconstruct pCO2 from the middle Eocene to the late Oligocene and demonstrate that it ranged between 1000 to 1500 parts per million by volume in the middle to late Eocene, then decreased in several steps during theOligocene, and reached modern levels by the latest Oligaen.
Evolution of Early Cenozoic marine temperatures
The equator to high southern latitude sea surface and vertical temperature gradients are reconstructed from oxygen isotope values of planktonic and benthic foraminifers for the following five time…
Rapid Acidification of the Ocean During the Paleocene-Eocene Thermal Maximum
Geochemical data from five new South Atlantic deep-sea sections indicate that a large mass of carbon dissolved in the ocean at the Paleocene-Eocene boundary and that permanent sequestration of this carbon occurred through silicate weathering feedback.
High‐resolution (104 years) deep‐sea foraminiferal stable isotope records of the Eocene‐Oligocene climate transition
We have constructed high-resolution (104– 105 years) benthic foraminiferal δ13C and δ18O records for the upper Eocene through lower Oligocene of two pelagic sequences, Deep Sea Drilling Project…
Climate Response to Orbital Forcing Across the Oligocene-Miocene Boundary
- J. Zachos, N. Shackleton, J. Revenaugh, H. Pälike, B. Flower
- Environmental ScienceScience
- 13 April 2001
A major transient glaciation at the epoch boundary of late Oligocene–early Miocene climate and ocean carbon chemistry from two deep-sea cores recovered in the western equatorial Atlantic corresponds with a rare orbital congruence involving obliquity and eccentricity, resulting in an extended period of low seasonality orbits favorable to ice-sheet expansion on Antarctica.
Significant Southern Ocean warming event in the late middle Eocene
A prominent middle Eocene warming event is identified in Southern Ocean deep-sea cores, indicating that long-term cooling through the middle and late Eocene was not monotonic. At sites on Maud Rise…
Carbon dioxide forcing alone insufficient to explain Palaeocene–Eocene Thermal Maximum warming
About 55 million years ago global surface temperatures increased by 5–9 ∘C within a few thousand years, following a pulse of carbon released to the atmosphere. Analysis of existing data with a carbon…
Astronomical pacing of late Palaeocene to early Eocene global warming events
A distinct carbonate-poor red clay layer in deep-sea cores from Walvis ridge is reported, which is term the Elmo horizon, which has similar geochemical and biotic characteristics as the Palaeocene–Eocene thermal maximum, but of smaller magnitude, suggesting that it represents a second global thermal maximum.