10 month 165438+30 degrees normal?
According to the monitoring of meteorological department, the temperature in some parts of China has been obviously high since June 5438+065438+ 10, especially in the south, with the highest temperature generally above 25℃ and even reaching 30℃ in some areas. Meteorologists said that this high temperature phenomenon is rare, and the reasons behind it are complicated, mainly including the following points:
1, Climate Warming: Under the background of global warming, extreme weather events occur frequently and temperature fluctuation intensifies. The high temperature of 5438+065438+ 10 in June this year reflects the global climate anomaly to some extent.
2. Atmospheric circulation: This autumn, China was controlled by a strong warm air mass, which led to high temperature in the southern region. In addition, abnormal atmospheric circulation may also lead to large fluctuations in temperature in some areas.
3. Geographical factors: China has a vast territory and complex terrain. The southern region has low terrain, humid climate and relatively high temperature in winter; The northern region has higher terrain and lower temperature in winter. This high temperature phenomenon may be related to geographical factors.
In view of this rare high temperature phenomenon, experts remind the public to pay attention to the weather warning issued by the meteorological department and make reasonable arrangements for travel and daily life. Although the current temperature is high, it may still fluctuate greatly after winter, and people need to do a good job of cold protection and warmth.
The influence of late winter
Since the autumn of this year, the temperature in northern China has been unusually high. In most areas of northeast, northwest and northwest, the winter time is later than normal, and in some areas it is more than 5 days later, which may affect the emergence and growth of crops and is not conducive to spring ploughing and sowing in the coming year.
Delaying winter may affect the growing season and cycle of crops, which is not conducive to agricultural production planning and output; The warm and hot climate leads to the rapid growth of crops, which is conducive to the overwintering and reproduction of pests and diseases, and the rain and snow disaster in severe winter and the risk of pests and diseases in the coming year increase.
Warm and hot weather may cause "ecological imbalance" of phenology. For example, some plant species may blossom or bear fruit at inappropriate times, and the reproduction and migration behavior of animals may also be affected.
Warm and hot weather may also reduce snowmelt runoff in the coming spring, leading to drought and water shortage. The decrease of precipitation or the delay of snowfall will lead to the decrease of groundwater level and the difficulty of water supply, which may adversely affect agricultural irrigation and urban water supply.