At present, human society is facing a rise in global temperature due to large amounts of carbon emissions. At the turn of the Paleogenesis, about 56 million years ago, there was also a rapid rise in global temperatures on Earth. The event, known as the Paleo-Sins Extreme Heat Event, was the strongest global rapid warming event since the new generation, leading to major changes in the atmosphere, the hydrosphere and the biosphere. Scholars believe that the rapid global warming event is related to carbon release.
Field profile of the ancient Sins-Emen extreme heat event in the Dingzhi region of Tibet
Recently, Zhang Qinghaihai, an associate researcher of the Mainland Collision and Highland Rising Key Laboratory of the Qinghai-Tibet Plateau Research Institute of the Chinese Academy of Sciences, and a team of academicians from Dinglin jointly with domestic and foreign researchers confirmed that the complete carbon isotope negative drift during the Paleoanthropology-Eifes extreme heat event period has a step-like structure, and the negative drift of carbon isotopes in the atmosphere and shallow seas has a larger scale. The results were published in the journal Earth and Planetary Change.
The carbon isotope value of the Earth’s surface carbon reservoir suddenly decreased significantly
“During the Paleo-Sins extreme heat event, a large amount of carbon with less C13 isotope content was released from the lithosphere into the atmospheric oceanic system, resulting in a significant negative drift of carbon isotope components in the Earth’s surface carbon reservoir. Zhang Qinghai told Science and Technology Daily that the so-called negative drift refers to the phenomenon of a sudden and significant reduction in carbon isotope values.
The Paleo-Sins extreme heat events lasted about 200,000 years, with carbon releases lasting about 1,000 to 50,000 years. “On a time scale of thousands to thousands of years, the Paleocchino-Eoconite extreme heat event provides us with a unique opportunity to study the interactions between climate change and the carbon cycle, which can help us better understand future climate, environmental and biological changes. Zhang Qinghai said.
In fact, the structure and magnitude of the negative drift of carbon isotopes are two core issues in the study of the Paleogenetics-Emenis extreme heat events. Most scholars believe that carbon isotope negative drift is a process of rapid reduction and gradual return of carbon isotopes, and based on this study of climate, environmental and biological changes during the Paleochea-Eocchio extreme heat event. In 1999, researchers such as Baines of the University of Oxford in the UK claimed in the journal Science that negative drift of carbon isotopes may have a more complex structure. But because of the lack of evidence, their views were quickly abandoned by the vast majority of scholars.
At the same time, the magnitude of the negative drift of the carbon isotope can be used to estimate the total amount of carbon released during the Paleotheino-Emen extreme heat event. Many scholars believe that the maximum range of negative carbon isotope drift is 4 inches, and only a few scholars believe that the magnitude of negative carbon isotope drift during the Paleosinis-Emen is extremely hot event may reach 6 to 8 per thousand. In the past 10 years, the negative drift of the carbon isotope of 4 per cent has been widely accepted by scholars.
Ancient Sines – The Turn of the Sine world may have multiple carbon releases
In other words, the prevailing view has long been that carbon isotope negative drift is the process by which carbon isotopes are rapidly reduced to the lowest and gradually returned;
In 2017, Ding Lin and Zhang Qinghai’s team questioned both mainstream views. Since then, the team has been studying trace elements and carbon isotopes for two years on the large-hole worm shell in the shallow sea carbonate rock profile in the Southern Dingzhi region of Tibet. Using laser stripping-plasma mass spectrometry and secondary ion mass spectrometry geochemical analysis techniques, the team analyzed the content of insitu trace elements and the composition of in situ carbon isotopes on the large-hole worm shell.
Studies have shown that during the Paleosis-Emeline extreme heat event, the complete carbon isotope negative drift has a step-like structure. The study also confirmed that in the shallow sea and atmosphere, the magnitude of the negative drift of carbon isotopes is about 7 per cent, and for the first time given the upper limit of the total amount of carbon released during the Paleoanthropology-Enoisne extreme heat event period is 28,000 Pg (Pg is a unit of carbon reserves, 1Pg carbon equals 1 billion tons of carbon), and currently the annual carbon emissions of human sequestration is about 10Pg.
The existence of a step-like carbon isotope negative drift structure suggests that there were multiple carbon releases during the Paleogenesis-Enomething extreme heat event, and that there was likely to be a positive feedback process for “carbon release-temperature rise-re-carbon release”. The negative drift of carbon isotopes in the atmosphere and shallow seas is significantly larger than in the deep sea, suggesting that the effects of carbon release on the atmosphere and shallow seas may be much greater than those of the deep sea.
“This warns us that the release of large amounts of carbon into the atmosphere-ocean system may result in a range of domino-style climate, environmental and biological responses. In a natural state, it may take hundreds of thousands of years for the Earth to return to its previous normal state of climate. Zhang Qinghai said.
He said that in the past, most of the research work on the Paleino-Emeline extreme heat event had come from incomplete sedimentary records, which could not accurately and completely restore the origin of the event, and that more sections with step-like carbon isotope structures would need to be unearthed in the future to further study it.