As of August 15, the National Meteorological Center has issued high temperature warnings for 26 consecutive days, which shows that this round of high temperature weather has lasted for a long time.
In recent years, summers have seemed to be hot, but this year has been ridiculously hot. In extreme heat, heat records have been broken in many places, and 40℃ is not even on the national heat list. It's not just China, the entire northern hemisphere is baking, Europe is suffering its worst drought in 500 years, temperatures in the Arctic Circle have soared to 32.5 degrees Celsius, and glaciers have melted enough in two days to fill 7.2 million Olympic-size swimming pools.
Experts introduce, this round of high temperature is still no sign of the end, the future will remain for a period of time, this year's extreme high temperature is not normal?
Is human-caused global warming starting to increase?
Continuous high temperature burn left the south in widespread drought, brought by the Yangtze river, one of the main tributaries in gaining nanchang appear waters of the river dried up the crack 39bet-kết quả bóng đá-kết quả xổ số miền bắc-kèo bóng đá -soi cầu bóng đá-đặt cược. On the surrounding crop production and residents' lives have an adverse impact. The three gorges dam in China's largest water conservation construction, why no large-scale water reduce downstream drought?
In 2003, 2013 and 2017, China had three of the strongest high temperature events in this century. Since June 13 this year, the high temperature has lasted for 50 days. Judging from the overall intensity, the combined high temperature of this year is very likely to break the record of 2017. It was even the most extreme heat since 1961, when the data began to be collected.
Caused The main reason for this year's heat wave is escapes in the northwestern Pacific subtropical high, the subtropical high pressure belt is a high pressure zone around the world, focused most of the desert regions in the world, then let it become the flood drought multiple zones, July to August every year, the subtropical high pressure zone will be north into the 25 ° to 30 ° latitude.
To prevail within its sinking airflow, sinking airflow will warming by adiabatic compression, particularly strong subtropical high performance this year. On the one hand, further north, coverage, further to the high pressure within the mainland exchange, on the one hand, internal sinking air is also very fierce, which makes high altitude air sinks into a warm air mass, hovering near the ground, cold air cannot enter.
And the downdraft mostly brings clear and cloudless weather, which enhances the amount of direct solar radiation to the ground, making the whole near the ground like an oven, thus triggering the extreme high temperature which has lasted a long time in our country.
If the abnormal subtropical high is natural, then global warming is man-made. According to the Sixth Assessment Report of the United Nations Intergovernmental Panel on Climate Change, global warming in the last 50 years has been occurring at a rate unprecedented in the past 2000 years.
This shows that the speed of global warming is accelerating and the climate system is becoming more and more unstable. Under the background of global warming, such heat wave events may become the norm in the future.
Global warming can almost be said to be a platitude topic. Its biggest source is a large amount of carbon dioxide emissions, carbon emissions in the industry. Most industries use carbon to generate electricity, so in order to achieve carbon emissions, it is necessary to reduce the amount of carbon used in industrial production.
China attaches great importance to this issue. In the past ten years, China's dependence on carbon has been reduced by nearly half. From urban to rural areas, we have been emphasizing new energy and reducing the use of carbon in a large way.
Although we are trying to reduce carbon emissions, we cannot escape from global climate change. There are still large scale droughts in our country. As we can see from the integrated meteorological drought detection chart, the drought phenomenon in the Yangtze River basin is obvious, and a large number of river beds are dried up or even cracked.
If the situation is so dire, why not let the Three Gorges Dam release water to relieve the drought pressure?
The three gorges dam is one of the most important water conservancy construction in the world. Its total length of 2335 meters, the dam height of 181 meters, the total capacity of up to 32.3 billion cubic meters, besides providing flood control value, provides important support for power generation in China. There is another important function: the storage capacity, easy-to-read: drought resistance.
But throughout the past movement, the Three Gorges Dam has always been dry season water storage, flood season water release. What is this?
Every year, during the rainy season, the rivers upstream will be very aggressive. At this time, the Three Gorges Dam will use flood control storage capacity to intercept the flood water that exceeds the safe discharge capacity downstream to ensure the safe discharge of the downstream river. After the flood, the Three Gorges Dam will release the previously accumulated flood control storage capacity to prepare for the next flood.
Flood control, naturally also wants to prevent drought, Xingli storage for drought preparation, for the next year in January to April dry season to prepare for the middle and lower reaches of the water replenishment, to meet the dry season when the downstream area shipping and water supply and other aspects of the water demand.
Although THE WUHAN section of the Yangtze River has the lowest water level in the history of the same period, in fact, this is already the result of regulation. If there is no water regulation, Wuhan is likely to have no water available now.
Moreover, the drought is multi-regional and multi-river, and the total amount of water storage is limited. If all the water storage is released to the downstream, the middle and upper reaches will fall into more severe drought. It is obviously futile to rob Peter to pay Paul.