Why does it never rain in Shandong?

Why is there little rain and drought in Shandong? First, analyze the geographical characteristics of Shandong. As far as rain is concerned, in fact, Shandong's geographical location is inherently inadequate:

First, it is too close to the arid and rainless areas of the Mongolian Plateau and the Loess Plateau, and it is deeply affected by its strong dry wind all the year round. On the contrary, Shandong is at the far end of the Pacific typhoon (water vapor wind), which is beyond the reach of the whip. In the dry-wet contest, the northwest dry wind is much better than the Pacific water vapor wind, so Shandong blows dry the wind all the year round, and the wind is strong. After some clouds pass, they are often blown away by strong dry winds.

Second, there is no continuous mountain range in Shandong, especially in the north of Shandong, which can neither stop the northwest dry wind nor keep the Pacific water vapor wind. Lonely and bare hills can neither retain water-bearing clouds nor produce water-bearing clouds by themselves. No matter the clouds from the south or the north, they can't stay, so it is difficult to form frontal rain. When it rains continuously in Shandong, it is often when the clouds in most parts of the country are too thick and have to spread to Shandong. As for the sudden downpour, it felt like the clouds had lost their way.

Man cannot conquer nature. Maybe we can expect some changes by making some small efforts to improve the climate environment in northern Shandong. Perhaps the wind protection project is the most important. For example: 1) Can you build a mountain range along the northwest of Shandong? Since the Yellow River hangs underground, why not dig deep into the Yellow River to lower the riverbed and borrow soil to build mountains? 2) Can we build more tall and broad windbreaks along the northwest of Shandong Province and irrigate them with the water of the Yellow River to reduce the wind and evil spirits that ravage Qilu? In order to change the situation that northwest Shandong-Ma Pingchuan and northwest dry winds enter Shandong like nobody's business.

First, the temperature; The annual average temperature in the whole province basically follows the distribution law of decreasing from southwest to northeast, but there is little difference between regions, mostly around 13. In the southern areas of Jining and Heze, Jinan and Zaozhuang are all above 14, of which Jinan is 14.7, which is the highest annual average temperature in the whole province. The average annual temperature in the hilly area of the peninsula is low, generally 1 1.4? 1 1.9; The peninsula outside Lubei and hilly areas is basically 12.0? 12.9; Other regions are generally 13.0? 13.9。 From June+10 in 5438, the average temperature in all parts of the province was below 0, which was the lowest in the whole year. Lubei and the inland of Shandong Peninsula are the areas with the lowest temperature in the province, generally around -3; -1.0 is common in the eastern and southern coasts of the peninsula and southern Shandong. Between -0.2, it is a high-value area in the whole province; Most other areas are in -2.0? - 1.0。

Solar radiation is the strongest in summer, and the temperature is the highest everywhere in summer. The temperature in the inland areas is the highest in July, and the eastern and southern coasts of the peninsula are affected by the maritime climate, and the temperature in August reaches the highest in the whole year. In August, the average temperature in all parts of the province was 2 1.5? Between 27.5. The average temperature in southern Jinan, Zibo, Jining and Heze is above 27; The temperatures in Weifang, Laiwu, Linyi and the west are all at 26? Between 27; The southeast coast of the peninsula is generally at 2 1.5? 25.0, most other areas are 25? 26。 The average temperature in July in Jinan still ranks first in the province, at 27.5. 65438+ 10 to July, the temperature rises gradually. After August, the temperature dropped month by month.

Second, precipitation; The average annual precipitation in most parts of Shandong Province is 600? 750mm, its distribution characteristics are more in the south and less in the north. The annual average precipitation of Mount Tai is 1042.8mm, which is the richest place in the province. The precipitation in southern Linyi and Zaozhuang is 800? Between 848mm, it is the area with the most precipitation in the whole province, and Linshu is the most, which is 848mm in the southeast of Shandong and 700 in most parts of the southeast peninsula. The precipitation in 800mm mountainous areas, southwestern Shandong and most parts of the peninsula is generally 600? Between 700mm; There is less precipitation in the northwest of Shandong and the northern part of the peninsula, generally below 600mm, and the area north of the Yellow River has the least precipitation, most of which is less than 550mm, of which Wucheng is the place with the least precipitation in the whole province, only 508.6 mm

The annual precipitation days in Shandong basically follow the law of increasing from northwest to southeast. There are fewer in northwest Shandong, and most of them are in 65? 70 days, Ningjin is the least, only 62.7 days; Southeast Shandong and eastern Peninsula are the areas with the largest number of precipitation days, generally at 80? 90 days, of which Wendeng is the most, 90.9 days; Most other areas are in 70? In 80 days, the average annual precipitation days in Mount Tai are as high as 95. 1 day.

Third, sunshine; The distribution of annual average sunshine hours in Shandong is opposite to the distribution of cloud cover, increasing from south to north, generally southwest to northeast, with a variation range of 2200? 2800 hours. Most parts of the central and eastern peninsula and northern Shandong are in 2600? Between 2800 hours; Lunan is the least, and most of them are in 2200? Change between 2400 hours, other areas, more than 2400 hours. Between 26 o'clock. Penglai ranks first in the province with 2807 hours, while southwest Shandong is only 2 148 hours, which is the least and only station in the province with less than 2200 hours.

The geographical location of Shandong Peninsula is between 36 and 37 degrees north latitude, with Bohai Bay in the north and the Yellow Sea in the southeast. Therefore, influenced by certain maritime climate and cold air in northwest and north, Shandong Peninsula is the place where cold air in northwest meets tropical depression in Southeast Asia from south to north. Therefore, whether the cold air in the north and the hot air in the south come to the peninsula is an important factor leading to less rainfall and less rainfall times. The special environment of the peninsula is the eastern end of North China, surrounded by the sea. Because of the mediation of ocean temperature, it is different from the mainland. Winter is not cold, summer is not hot, northeast is not dry, Jiangnan is not wet, and rainfall frequency and rainfall are less than those in north and south. Unless the weather is covered with large clouds in China, it is generally difficult to have decent rainfall in Shandong, especially in Jiaodong in eastern Shandong.

The meteorological environment is that typhoons brought by subtropical storms often land in Hainan, Guangdong, Fujian and other provinces. When they turned to the north and came to Shandong, the rainfall was mostly exhausted, and the rainfall and rainfall were insufficient. Unless the typhoon moves northward, such as "Meihua" and "Blavin" crossing Shandong Peninsula twice, it will bring enough rainfall to Jiaodong Peninsula, so that the large and small water reserves in eastern Shandong will be filled with rainwater and the problem of peninsula drought will be solved. Shandong Peninsula is generally the intersection of cold air in the north and ocean depression, and it is a place where cold, hot, dry and wet climates struggle from south to north, so it is a dry place with little rainfall.

Evaporation-precipitation is an eternal cycle process of earth's water. Only by keeping the dynamic balance between evaporation and precipitation can the earth's climate remain relatively stable. All the fresh water resources we use come from atmospheric precipitation. Centralized sewage treatment mode makes a lot of fresh water resources flow into the sea and rivers in vain. These fresh water resources were originally returned to the atmosphere by evaporation because of the ground, water surface and plants. As can be seen from the above figure, the sewage treatment rate in Beijing was very low before 1998, so these sewage.

Part of groundwater seeps into the ground to replenish groundwater, and part of it evaporates into the air and atmosphere through photosynthesis of vegetation. The centralized sewage treatment mode turns groundwater evaporation into "zero evaporation" and cuts off the normal groundwater recharge channel. For example, the annual average atmospheric humidity in Beijing has gradually decreased since 2004, and the groundwater level in Beijing and Hebei has dropped below 50 meters. According to media reports, the trees on Chang 'an Avenue have been repeatedly killed by drought! Therefore, the centralized sewage treatment mode destroys the natural circulation of fresh water. According to official media reports, in 2008, the sewage discharge rate in Beijing reached more than 90%, which was positively related to the occurrence of smog in Beijing on the time axis!

According to the data of the Ministry of Housing and Urban-Rural Development, by the end of 20 1 1, the national sewage treatment scale will be 65438+36 million tons/day, with an annual increase of 10%. By 20 15, the sewage treatment scale will reach 200 million tons/day, and the annual sewage treatment capacity will be 2 * 365 = 73 billion tons. At present, the sewage utilization rate is less than 20%. Most of the reclaimed water flows into rivers and seas in vain. If all the sewage evaporates into the atmosphere, there will be 0.48 tons of precipitation per square meter, that is, 480mm rainstorm, in an area of 6.5438+0.5 million square kilometers in Shandong Province. It can increase the sea level of 770,000 square kilometers in the East China Sea by 9.4cm；; Furthermore, you can calculate how much heat these huge amounts of sewage can absorb in the process of volatilization and how many degrees can it reduce the atmospheric temperature? Therefore, the impact of centralized sewage treatment mode on climate can not be ignored! Even catastrophic, from this perspective, what "global warming" and "sea level rise" are caused by centralized sewage treatment mode, not what CO2!

Water regulates the temperature of the earth's atmosphere by changing its gas, liquid and solid states, absorbing and releasing heat. Without water, the earth will become the moon, especially the water content in the atmosphere, that is, atmospheric humidity, which has a great influence on the climate. The centralized sewage treatment mode makes the mainland atmosphere short of 72 billion tons of circulating water, which should also be an important factor causing extreme heat in summer and extreme cold in winter. It is meaningless to analyze the causes, geographical characteristics, latitude and other invariants of drought in Shandong, but it is necessary to analyze variables. The biggest variable in recent years is that the construction of sewage treatment plants has weakened the evaporation of ground water.