All animals, if they live on land or water, require oxygen respiration. But today the world oceans lose oxygen, a combination of rising temperatures and changing ocean currents. Both factors are caused by human-made climate change.
This process has the potential to disrupt naval chains. We already know that large hypoxic or low oxygen, zones can be deadly. If hypoxia expands both size and duration, it can lead to extensive marine life, which occurred in the earliest history of the Earth.
We study natural, ancient changes ocean oxidation and biological effects as a natural reaction to the climate scenario of the natural future. During a recent study, study the major volcanic phenomenon that occurred millions of years ago and changes in ocean oxygen levels. Like human activity today, this event has published a massive amount of carbon dioxide and other greenhouse gases in the atmosphere.
We discovered that this episode appeared on the oceans of significant oxygen in the oceans that lasted for more than a million years. Our research adds to the growing evidence that sea oxygen content drastically exceeds the temperature warming and other climate challenges caused by the release of greenhouse gases.
Are our oceans ugly?
Scientists widely agree that human activities – mainly fossil fuels, forests and agricultural practices – carbon dioxide and methane pass through unprecedented rates in the atmosphere. Over the past several decades, climate change impact research has focused on global warming, sea level growth and ocean acidity. Now, ocean oxygen loss begins to notice.
World oceans have lost over 2% of oxygen reservoirs over the last five decades. Many local factors, such as pollution of nutrients, are deteriorating. In the US waters, major hypoxic zones are regularly created in the Gulf of Mexico, the Great Lakes and the Pacific Coast. Other coastal waters, as well as around the world, influence.
Hypoxia can kill fish. For example, in 2002 the main fish of the Philippines killed oxygen levels by water. A similar case occurred on the Red Sea coast, in California in 2011, when a few days of hypoxic conditions reduced local fish population. In the end, these events have a significant impact on people, as 40% of the world's population lives around 60 miles of the ocean. Millions of people depend on fish, revenue, or both.
It is related to the loss of ancient oxygen to marine mass extinction
Volcanic eruptions in the past are probably our only ancient analogy for modern greenhouse gas emissions. To understand how these oceans were affected, the ancient marine cliffs that can see the carbon dioxide evaporate, ocean oxygen levels and extinction processes.
One such case occurred during the early jurisprudence of 183 million years ago is called the tarcicic oceanic anoxic phenomenon. It is known for the major vulcanization and the seventh largest mass extinction in the history of the Earth, mostly in the oceans. Volcanoes were so much bigger than all modern volcanoes, and the warming of greenhouse gases in the atmosphere was warming the planet.
We got a new and novel instrument – Thalium Isotopes – in order to determine the time and volume of oxygen loss from oceans. Thallium is a soft, silvery metal that occurs in various ores, including manganese balls on the ocean floor. Isotopes combine the atoms of the same element with minor differences, as they differ on the neutron different numbers.
Many minerals are created in the ocean, often through reactions that contain oxygen. But ocean-free oxygen is not a constant modern ocean and is also varied. Oxygen is rich in ocean, deposits of manganese oxide on the ocean floor, and thiolium – especially heavy isotopes – for them stick. Looking for an analysis of the ancient marine sediments and the shift of isotope value of the Talium, we conclude that we can progressively lose oxygen oxygen.
To this end, we have collected dark dark sedimentary rocks in this period in Canada and Germany, where two different ancient oceans are represented. We subsequently destroyed each layer of rock in liquid and isolated and cleansed each sample thyme.
We found that tallium isotopes at this stage will move into two stages. The first oceans became less oxygen when massive volcanoes began, about 183.8 million years ago, 183.1 million years ago. The oceans have lost even more oxygen, the most intensive phase of volcanism that occurred 182.1 million years ago in 182.6 million years ago.
This work first shows that the global ocean has lost its oxygen to the beginning of volcanoes. It is important that this happened at the beginning of the famous extinction, called the Plainsbach-Torcán mass extinction event. In other words, the first signs of extinction of the oceans coincide with the loss of oxygen oxygen.
We now think that this condition low oxygen marine conditions lasted for one million years and two endangered. The second phase of deoxygenesis is further expanded, causing greater extinction. This happened, even though the atmosphere had enough oxygen to support life, just as it is today. Moreover, the duration of low oxygen conditions was similar to the one event that occurred about 94 million years ago, related to biological effects.
Global warming barrier?
The Intergovernmental Panel of Climate Change recently published a special report on global warming at 1.5 degrees which urgent measures to reduce climate change levels that will help reduce environmental and ecosystem stress. Scholars generally agree that this means avoiding global average temperatures that exceed 1.5 degrees to higher levels.
The report states that if the temperature of 2 ° C with 1.5 ° C increase, the oceans will lose significantly more oxygen. It is important to continue the ancient effects of losing oxygen to the extent that scientists can better assess future climatic scenarios. It is also important to identify areas such as the loss of ocean oxygen that will have the most impact and limit the impact of the environment, which keeps our planet warm.
Volcanic activity, ocean oxygen decreases mass extinction of the ancient organism