PETM
What is it and what caused it? Why are people so interested in it?
PETM is the short interval of temperature with maximum aspect that lasted for approximately over 100,000 years in the course of late Paleocene and the early Eocene epochs. The interval had the characterization of high global temperatures referred to as the Cenozoic era. PETM associates with the unexpected methane hydrates release from the sediments of the ocean triggered by a volcanic eruption that is massive. The attribution of carbon release having the form of methane was at È 2000 × 109 metric tons. Theory suggests that the ocean absorption and oxidation of the carbon might have enabled the reduction of the pH of the deep sea. This is to trigger a calcite compensation depth shoaling rapidly with gradual recovery following.
People are so much interested in the PETM following the ecological consequences that were massive after occurring within thousand years. There was a widespread of inconsiderable marine and terrestrial ecosystem extinctions. The interests have enabled the collection of evidence presented in paleontological and sediments records gathered from continents with vegetation zones moving towards the equator.
How was the experiment designed?
The experiment was designed following the abrupt increment of temperatures initiated and in accompaniment of carbon dioxide emission in massive amounts. The experiment was a demonstration of the direct influence of carbon dioxide atmospheric concentrations with direct influence to the temperature of the planet.
What is evidence that methane release was responsible?
Following the research work carried out, the deep-sea sediments of methane clathrates are the considerable the possible culprit. The heating and re-pressurizing of the frozen methane resulted to break down with oxidation to carbon dioxide. Methane is a higher depletion of carbon-13. The increment of the carbon dioxide of ≥ 2000 ×109 metric tons with sequestration resulting to silicate weathering contributed by methane simulation.
Why does all the evidence combined suggest that a source other than just biogenic methane must be involved?
All the evidence combined suggest that a source other than just biogenic methane must be involved since higher climate sensitivity is involved, the long atmospheric lifetime nature of the involved carbon dioxide, acidification of the ocean is the major considerable aspects. Volcanic activities must be involved with the disruption of the organic sediments with methane to enable an increment of silicate weathering and carbon dioxide release.
What occurs during the migration of the lysocline/shoaling of the CCD?
During the migration of the lysocline/shoaling of the CCD, there is a significant ecosystem transformation with carbon cycling changes. This results from the increment of CO2 or CH4 concentrations in the atmosphere system of the ocean. There is dissolution of calcium carbonate within the specified sediment column with carbonates burning down the carbon digression intensity.
Why is the response strongest (and over thickest core interval) at the shallowest site?
The response is stronger at the shallowest site since the carbonate under saturation in excess impedes calcification by the specified marine organisms, therefore, contributes to the benthic foraminifera mass extinction.
How long is the PETM oceanic perturbation thought to have lasted?
The PETM oceanic perturbation is thought to have lasted for 200,000 years with global temperatures rising by 6oC – 8oC further.
What do you take from this study as implications for modern oceanic acidification? Why would the modern impact of raising dissolved CO2 levels potentially be more severe in surface ocean waters given a shorter period of C input?
From the study, modern ocean acidification is a looming direct threat following the absorption of carbon dioxide by the seawater to make unclear adjustments to pH. This enables the net decrease in carbonate ions amount availability. This makes it difficult for calcifying marine organisms hence are prone to dissolution. The acidity increment also causes direct effects to blue muscles immune response depression and metabolic rate depression in jumbo squid.
The modern impact of raising dissolved carbon dioxide levels will be more severe in surface ocean waters given a shorter period of C input. This is since the decrease in ocean pH potentially affects organism’s metabolic energy. This is to ensure efficient operation of biochemical processes. The sound frequencies that are significant for marine and sonar communication may also be interfered with hence interfering with efficient propagation in the respective waters.
What is the silicate weathering feedback they discuss?
The discussed silicate weathering feedback enables the adjustments to the atmospheric carbon dioxide level forcing balance. The metamorphic CO2 and volcanic sources unaffected with reduction in ground temperatures, in the carbon cycle, are also discussed.
Did you find the arguments in this paper convincing? If not, why not?
The arguments in this paper are convincing since there is a consistent presentation of evidence in the elaboration of the PETM period, which happened 56 million years ago. The arguments also elaborate on the mystery of carbon with PETM first noticed through the analysis of sediment cores of the marine.
