Four questions about the severe drought in the Yangtze River Basin: Why is the drought during the flood season, and when will the rain come to quench their thirst?

From July to August of this year, the rainfall in the Yangtze River Basin was obviously small, and Sichuan, Chongqing, Jiangxi and other places encountered continuous extremely high temperature weather. Affected by high temperature and rainy weather, the drought in the Yangtze River Basin has developed rapidly. At present, the area of ​​special drought has reached 89,000 square kilometers, which has a significant impact on agricultural production and power supply. What impact did the meteorological drought on the Yangtze River Basin bring on the local area? It was shouting "thirsty" during the flood season. Who is behind the scenes? When will the weather turn?

1. How serious is the lack of water and drought in the Yangtze River Basin?

From July to August this year, the rainfall of the Yangtze River Basin was significantly less. Among them, the average precipitation in July reached 141.2 mm, which was 48.2%less than the same period of the year, and it was the least in history since 1961. Since August, the cumulative precipitation in the eastern part of Jiangnan, Jianghan, and southwestern region is less than 10 mm.

According to the monitoring data of the Central Meteorological Station, from July 1st to August 15th this year, the cumulative precipitation in major cities in the Yangtze River Basin was at least 50%less than at least the same period of the year, of which Nanchang, Fuling, Wulong and other places were less than 80%. The rainfall of the same year is generally more than 200 mm, but this year only 30 to 40 mm.

In addition to the significantly less rainfall, the extremely long -lasting high -intensity and high temperature also makes meteorological drought develop rapidly. Up to now, the mid -drought and above area of ​​the Yangtze River Basin reached 1.267 million square kilometers, of which 89,000 square kilometers were raised. Sichuan, Chongqing, Hubei and Jiangxi and other provinces (cities) all have a severe drought level.

2. What impact of high temperature and drought on people's production and life?

The water level of the river is lower, the area of ​​the lake is narrowed, and even entering the dry period in advance, the cultivated land is drought, and the water supply and power supply are tight ... High temperature and drought have a significant impact on local people's production and life.

According to the Ministry of Water Resources, due to the weather of high temperature and rain, the water level in the Yangtze River and Dongting Lake and Poyang Lake are currently 4.85 to 6.13 meters lower than the same period of the year. The area of ​​three -quarters was reduced from June. Among them, on August 4th, the water level of Poyang Lake was lower than the dry water level, setting a record of the earliest record since the record in 1951. Sichuan, Chongqing, Hubei, Hunan, Jiangxi, and Anhui 6 provinces (cities) have a drought of 1.232 million mu, 830,000 people, and 160,000 large livestock affected due to drought supply.

In areas where water is generated by water, electricity tensions have occurred. According to economic information network reports, Zhou Jian, deputy chief engineer of the State Grid Sichuan Electric Power Regulation Center, said that 80%of the local power supply originated from hydropower. This year's rare high -temperature and drought disasters caused major waters in major watersheds, which led to the province's hydropower power generation The ability to decrease by more than 50 %. Dazhou and other places have introduced an orderly power restriction policy, which has relieved power tension.

3. Why is there such a serious drought during the flood season?

According to Wang Weiyue, a meteorological analyst of China Weather Network, this is related to the high -temperature and low rain mode of high temperature and rainstorm mode from July to August this year. This year, the subtropical high -pressure strength is significantly strong, and it controls the Sichuan Basin to Jianghan, Jiangnan, Jianghuai and other regions for a long time. Under its control, the above -mentioned areas prevail in the air, which causes the ground to temperature, and the sky is not easy to form clouds, making solar radiation easier to reach the ground, frequent high temperature and strong strength.

This year, the high -pressure intensity of the subtropical tropics is strong, which makes the entire river basin in the Yangtze River continue to be high and rained. The main rivers and lakes in the basin are significantly less water, and the water level is significantly low, which occurs significantly drought.

4. When will the high temperature in the south alleviate the rain?

In the next week, the subtropical high pressure will still be entangled in Jiangnan and South China, and the intensity is strong. The weather pattern of high temperature and rain and rain will still be maintained. Wang Weiyue introduced that starting on the 25th, as the cold air in the north strengthens the south, and penetrates from the underlying layer of the subtropical high pressure, the high temperature weather in the south will weaken, and precipitation may occur. The southwestern region, central Jiangnan and South China will have middle to heavy rain and heavy rain.

Under the double influence of rainfall and cold air, the long -lasting high temperature weather strength in the south weakened. The range of 40 ° C in the Yangtze River Basin has been reduced. For example, Chongqing Shapingba has reached 40 ° C+for 11 consecutive days, and the highest temperature around 26 days is expected to drop below 40 ° C. However, there are still high temperatures above 35 ° C in many places in the Yangtze River Basin, and heat prevention work still cannot be relaxed.

(Source: China Weather Network)

【Edit: Shang Pei】

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