From the beginning of 2021, extreme climate extremes around the world have become more frequent and unexpected. The frequent occurrence of extreme weather may make the earth we live on breathless, causing more natural disasters such as floods, wildfires, lightning strikes and so on. This is not alarmist, as evidenced by the recent high temperatures in North America, flooding in Europe, lightning strikes in Bangladesh, and so on. In recent years, global extreme weather has become more and more severe.
In terms of the influencing factors of climate change, both man and nature are half responsible. Natural changes cannot be intervened by humans, but there are still many aspects to be improved on the human side. For example, reducing carbon dioxide emissions, improving irrational mining methods, afforestation, etc. are all good ways. Obviously, people have not yet realized the urgency of making changes.
Three North Shelterbelt Project
The Earth's circulation is becoming increasingly unstable or approaching a critical point threshold
The University of Copenhagen in Denmark and the Potsdam Institute for Climate Impact Research in Germany recently published the results of the study on the "amoc" Atlantic key circulation system. Scientists have found that previous studies have suggested that the Atlantic Circulation is currently in its weakest state in more than 1,000 years, but so far it has been found that the weakening of the Atlantic Circulation may only correspond to a change in the average circulation state, perhaps related to the loss of dynamic stability of the circulation.
Scientist Boers believes that the reason for which of the two is actually fine if it is due to the first reason, but if it is because the second atmospheric circulation has lost its dynamic stability, then the problem is serious, which means that the street threshold may suddenly and impossible to turn to the weak mode of transition.
Sichuan will fully establish five-level forest chiefs
Atlantic Circulation Collapse? What is the reason
Amoc is also known as the Atlantic Ocean through the inverted circulation, as the key circulation of the Atlantic Ocean its importance can be seen. Typically, AMOC transfers heat from the tropics to the Northern Hemisphere, transports warm water masses northward on the ocean surface, and returns southward in the form of cold currents at the bottom of the ocean. Amoc has two different modes, one is the current one that has reached a strong point, and the other is a much weakened mode of operation. Scientists point out that although these two models are extreme poles, in fact there may be a transition, and the current Earth seems to be going through this process.
According to the Guardian, amoc has almost lost stability since the last century, and the flow rate is in the slowest state since 1600. According to the scientists, it is a pity that there were no previous long-term observations of amoc, but there were comparable data left by amoc in terms of sea surface temperature and salinity in the Atlantic Ocean. Through these data analysis, it was found that the flow rate is now even nearly stagnant. According to climatologists, if the currents of the ocean are close to stagnation, breaking through the "tipping point" will have a devastating impact on the global climate.
Scientist Bours explains that "most of the data suggest that the recent weakening of the Atlantic circulation is directly caused by the warming of the oceans in the northern Atlantic", but it is too unexpected to have such a sudden and large state shift. He further suggested that perhaps such an anomalous loss of stability may have been due to the melting of the Greenland ice sheet and the melting of Arctic sea ice, which increased the overall net flow of rivers, coupled with the overall precipitation, which led to the influx of large amounts of freshwater into the North Atlantic.
However, this claim has also been questioned, and some scientists believe that this is also untenable, because although signs of instability have been detected in the Greenland ice region, the runoff from its melting alone is not enough to destabilize the amoc. As for why, scientist Boers said we need to look for ways to improve the melting of the polar ice sheet and the Atlantic circulation anomaly as a way to slowly constrain and predict possible further changes in the future.
What are the effects of the Atlantic Circulation Collapse?
Researchers say that if the Atlantic ocean's warped circulation (amoc) stagnates or even breaks through the "tipping point", it may be a devastating blow to the earth. The precipitation that billions of people in India, South America and West Africa depend on will be damaged, while storm weather in Europe will increase, temperatures will drop, sea levels will rise in eastern North America, and further endanger the Amazon rainforest and the Antarctic ice sheet.
Bours pointed out that the reasons for the stagnation of the Atlantic ocean's inverted circulation are complex, and that ocean currents are more unstable due to global warming, and that the only way to minimize carbon dioxide emissions is to reduce the possibility of ocean current collapse.
Changes in Arctic sea ice range from 1979 to September 2020
The other extreme of global warming is global cooling, so is the earth getting warmer or colder? Some people may say that the weather is too hot now, and perhaps "global cooling" is a better way of life for Earthlings.
However, some studies have pointed out that if global warming is to be eliminated, it can take 15 to 20 years. Compared with such a period of change that can be exchanged for a more perfect earth, why not reduce carbon emissions from now on to return the earth to its original balance?
From 1990 to 2019, the average concentration of atmospheric carbon dioxide in the global atmospheric background station of Hunana Roya in Qinghai, China and Hawaii in the United States changed
According to statistics, as of May, global carbon dioxide emissions climbed to 419 ppm, global warming is still ongoing, and now the Atlantic circulation has been found to be in a state of possible collapse. Nature also shows that when the warming in the ground is "interrupted", certain earth protection mechanisms may be activated at the same time, such as the cooling phenomenon that may be triggered by the collapse of the Atlantic circulation, and this process may last for 40-50 years.
Global CARBON DIOXIDE EMISSIONS
Greenhouse gases hit new highs, "methane bombs" or outbreaks
Recently, the "Blue Book of Climate Change in China" was published, which pointed out that the average concentration of major greenhouse gases such as carbon dioxide and methane in recent years has reached a new high. Under the circumstances of global warming, our biosphere, cryosphere, hydrosphere, and atmosphere have all developed to varying degrees. In particular, the glacier melting represented by Greenland has been accelerating since 1985, and by 2020, it is generally in a state of high material loss, with an average material loss of up to 982 mm water equivalent.
Map of limestone formations in Siberia
The Proceedings of the National Academy of Sciences of the United States of America, published last month, also pointed out that based on the pulse system to map atmospheric methane concentrations to observe methane emissions in Siberia in 2020, they found that after the June heat wave, the northern Siberian region and Tamil moved to two elongated areas of increased methane concentrations, and completely coincided with the two directions of underground limestone. This shows that the "methane bomb" buried under the Arctic permafrost and ice is stirring up trouble, and it is also contributing to global warming.
Satellite monitoring of methane concentration data in Siberia
summary
There are too many anomalies in the earth's climate in 2021, the earth is a circle, and the biosphere, atmosphere, hydrosphere, etc. are all a circulatory system. Now that the climate problem is getting worse, humanity really has to start facing up to the problem and starting to solve it.
Ganymede
Life on Earth is in crisis, and the harm caused by many extreme climates in 2021 is not the case, and it is obviously up to us to change the situation. Moving away from the earth to the "second earth", such as Mars and ganymede, at present, it is a bit unrealistic, the conditions are not available, and it is not very good to solve the climate problem and stay in the home of the earth.
#Heavy rainfall in the southwest hits ##全球变暖 #