Traditional Culture Encyclopedia - Weather inquiry - Guangdong issued 54 weather warnings a day. Why is it raining so hard in Guangdong recently?
Guangdong issued 54 weather warnings a day. Why is it raining so hard in Guangdong recently?
In fact, there have been so many extreme rainstorms in Guangdong recently, not because of the impermanence of heaven, but because of the climate background and climate mechanism.
The global warming trend is obvious, and the frequency of extreme precipitation is inevitable.
Some recent literature is about extreme precipitation, so I want to explain to you in a more popular way why extreme precipitation will increase after global warming.
First of all, let's look at several necessary conditions for the formation of extreme precipitation:
① Adequate water vapor supply: When the saturated specific humidity of the atmosphere reaches a considerable value or above, a rainstorm is formed. Besides high saturation specific humidity, there must be sufficient water vapor supply.
② Strong upward movement: Only by releasing unstable energy can a strong upward movement be formed.
③ Long duration.
(4) favorable terrain conditions.
After global warming, with the increase of atmospheric temperature, the water capacity of air will be increased to some extent. In this way, the atmosphere can easily meet the first "sufficient water vapor supply". In this way, as long as 2~4 items are met, it is easy to produce extreme precipitation.
So in fact, it's not just the frequency of extreme precipitation in Guangdong that has become higher. In recent years, extreme precipitation in many parts of the country has shown an increasing trend. (Of course, in fact, this situation will make the arid areas more arid, and the waterlogged areas more waterlogged, which will aggravate extreme precipitation. )
Mid-April to early June is the rainy season in South China.
The so-called rainy season is actually such a season with concentrated precipitation. In fact, the rainy season in different parts of China will change with the northward shift of subtropical high every year, and this change has certain regularity.
Generally speaking, we mainly pay attention to the precipitation in the eastern part of China, and the rainy season in these places generally changes in this law every year:
① rainy season along the coast of South China-April to mid-June 10.
(2) The rainy season in the Yangtze River basin-from early June to early September.
③ Northeast rainy season-from mid-July to the end of August.
Therefore, in fact, it rains a lot from April to June every year in Guangdong. After all, it's rainy season, right?
Third, the precipitation in Guangdong will also be affected by various weather systems such as fronts and typhoons.
Because of the sea, a lot of precipitation in Guangdong is actually related to typhoons. For example, the typhoon Mangosteen, which was very popular before, actually had a great impact on Guangdong.
So I think the heavy rainfall in Guangdong this year has a lot to do with these active weather systems.
The above is my own opinion ~ Of course, there are still many influencing factors, such as ENSO and PDO. It's not so easy to explain completely, and I hope everyone knows more about the weather and is less biased ~
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