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Oceanic anoxic events or anoxic events occur when the Earth's oceans become completely depleted of oxygen (O2) below the surface levels. Although anoxic events have not happened for millions of years, the geological record shows that they happened many times in the past.
Oceanic anoxic events have been recognized primarily from the already warm Cretaceous and Jurassic Periods, when numerous examples have been documented, but earlier examples have been suggested to have occurred in the late Triassic, Permian, Devonian (Kellwasser event/s), Ordovician and Cambrian.
Typically, oceanic anoxic events last for under half a million years, before a full recovery.
Dead zones are hypoxic (low-oxygen) areas in the world's oceans, the observed incidences of which have been increasing since oceanographers began noting them in the 1970s.
In March 2004, when the recently established UN Environment Programme published its first Global Environment Outlook Year Book (GEO Year Book 2003) it reported 146 dead zones in the world's oceans where marine life could not be supported due to depleted oxygen levels.
A 2008 study counted 405 dead zones worldwide.
Eutrophication (Greek: eutrophia—healthy, adequate nutrition, development; German: Eutrophie) is the movement of a body of water′s trophic status in the direction of increasing plant biomass, by the addition of artificial or natural substances, such as nitrates and phosphates, through fertilizers or sewage, to an aquatic system. In other terms, it is the "bloom" or great increase of phytoplankton in a water body. Negative environmental effects include hypoxia, the depletion of oxygen in the water, which induces reductions in specific fish and other animal populations. Other species (such as Nemopilema nomurai jellyfish in Japanese waters) may experience an increase in population that negatively affects other species.
Hypoxia, or oxygen depletion, is a phenomenon that occurs in aquatic environments as dissolved oxygen (DO; molecular oxygen dissolved in the water) becomes reduced in concentration to a point where it becomes detrimental to aquatic organisms living in the system.
Originally posted by antar
What on earth are you guys defending??? I would defend anyone "crazy" enough to speak out against the furvor of insanity which is KILLLING our planet and all life on it.
It is sad that he says this but it still falls on deaf ears.
I personally would love to hear more about what he knows and is willing to share.
Originally posted by antar
There is a great story about just that, a man by the name of Monsoor. Basically his Master was being stoned to death by hordes of ignorant people in the village and rather than throw stones, he compromised and threw a rose for fear that if he did nothing, he too would end being tortured.
In the end he was far more tortured because the others were ignorant but he knew the truth and could never forgive himself and went mad with grief and sorrow.
OAE2, occurring at the Cenomanian/Turonian boundary (about 93.5 Myr ago)3, is the most widespread and best defined OAE of the mid-Cretaceous.
Although the enhanced burial of organic matter can be explained either through increased primary productivity or enhanced preservation scenarios1, 2, the actual trigger mechanism, corresponding closely to the onset of these episodes of increased carbon sequestration, has not been clearly identified. It has been postulated that large-scale magmatic activity initially triggered OAE2 (refs 4, 5), but a direct proxy of magmatism preserved in the sedimentary record coinciding closely with the onset of OAE2 has not yet been found.
Here we report seawater osmium isotope ratios in organic-rich sediments from two distant sites. We find that at both study sites the marine osmium isotope record changes abruptly just at or before the onset of OAE2. Using a simple two-component mixing equation, we calculate that over 97 per cent of the total osmium content in contemporaneous seawater at both sites is magmatic in origin, a ~30–50-fold increase relative to pre-OAE conditions.
Furthermore, the magmatic osmium isotope signal appears slightly before the OAE2—as indicated by carbon isotope ratios—suggesting a time-lag of up to ~23 kyr between magmatism and the onset of significant organic carbon burial, which may reflect the reaction time of the global ocean system. Our marine osmium isotope data are indicative of a widespread magmatic pulse at the onset of OAE2, which may have triggered the subsequent deposition of large amounts of organic matter.