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Marked Decline in Atmospheric Carbon Dioxide Concentrations During the Paleogene
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.
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
A Transient Rise in Tropical Sea Surface Temperature During the Paleocene-Eocene Thermal Maximum
Using mixed-layer foraminifera, it is found that the combined proxies imply a 4° to 5°C rise in Pacific SST during the PETM, which would necessitate a rise in atmospheric pCO2 to levels three to four times as high as those estimated for the late Paleocene.
Coupled Greenhouse Warming and Deep Sea Acidification in the Middle Eocene
[1] The Middle Eocene Climatic Optimum (MECO) is an enigmatic warming event that represents an abrupt reversal in long-term cooling through the Eocene. In order to further assess the timing and
Warming the fuel for the fire: Evidence for the thermal dissociation of methane hydrate during the Paleocene-Eocene thermal maximum
Dramatic warming and upheaval of the carbon system at the end of the Paleocene Epoch have been linked to massive dissociation of sedimentary methane hydrate. However, testing the Paleocene-Eocene
A 40-million-year history of atmospheric CO2
A pCO2 record spanning the past 40 million years from a single marine locality, Ocean Drilling Program Site 925 located in the western equatorial Atlantic Ocean, shows that in the Neogene with low CO2 levels, algal carbon concentrating mechanisms and spontaneous biocarbonate–CO2 conversions are likely to play a more important role inAlgal carbon fixation, which provides a potential bias to the alkenone–pCO2 method.
Extreme warming of mid-latitude coastal ocean during the Paleocene-Eocene Thermal Maximum: Inferences from TEX86 and isotope data
Changes in sea surface temperature (SST) during the Paleocene-Eocene Thermal Max- imum (PETM) have been estimated primarily from oxygen isotope and Mg/Ca records generated from deep-sea cores. Here
The Palaeocene–Eocene carbon isotope excursion: constraints from individual shell planktonic foraminifer records
The most expanded records consistently show a bimodal isotope distribution pattern regardless of location, water depth or depositional facies, which suggests one of several possibilities: the isotopic composition of the surface ocean/atmosphere declined in a geologic instant.
North American continental margin records of the Paleocene‐Eocene thermal maximum: Implications for global carbon and hydrological cycling
The impacts of the Paleocene-Eocene thermal maximum (PETM) (?55 Ma), one of the most rapid and extreme warming events in Earth history, are well characterized in open marine and terrestrial