Why does the weather keep changing, please thank you

Answer 1: Weather is a general term for atmospheric conditions (such as cold and warm, wind and rain, dry and wet, cloudy and sunny, etc.) and their changes in a certain area in a short period of time. Weather system usually refers to the atmospheric movement system with typical characteristics, such as high pressure, low pressure and high pressure ridge and low pressure trough, which cause weather changes and distribution.

All kinds of weather systems have certain spatial and temporal scales, and the various scale systems are intertwined and interact with each other. The combination of many weather systems constitutes a large-scale weather situation that constitutes the atmospheric circulation of the hemisphere or even the world. Weather systems are always in the process of rebirth, development and disappearance, and have their corresponding distribution of weather phenomena at different stages of development.

Therefore, the weather and weather changes in a region are related to the weather system and its development stage, and are the combined results of the dynamic and thermal processes of the atmosphere. All kinds of weather systems are formed, developed and evolved in a certain atmospheric circulation and geographical environment, and all reflect the environmental characteristics of a certain region. For example, the polar region and its surroundings are covered with ice and snow all year round, and the air is cold and dry, which has become the background condition for the formation and development of low-altitude cold high pressure and high-altitude polar vortex and trough in the polar region.

The high temperature and humidity in the equatorial and low latitudes all year round, and the unstable atmosphere are necessary conditions for the emergence and development of convective weather systems. The middle and high latitudes are areas where cold and warm air currents often meet, and not only the cold and warm air masses alternate frequently, but also their baroclinic pressure is unstable, which is an important basis for the formation and development of frontal and cyclone systems. The formation and activity of weather systems, in turn, can have a profound impact on the structure and evolution of the geographical environment.

Therefore, it is very important to understand the formation, characteristics, changes and evolution of weather and climate and the evolution of the geographical environment. Reference: Meteorology and Climatology (3rd Edition) Author:

Zhou Shuzhen Answer 2 Weather is the change in the physical condition of the atmosphere in a short period of time, and the main factors affecting the weather are air masses and fronts. 1) Air mass: It can be divided into warm air mass and cold air mass.

When controlled by a single air mass, the weather is monotonous, often showing as sunny weather. When an air mass in a place is replaced by a new one, the weather changes. 2) Fronts:

The interface between cold and warm air masses. When the cold air mass moves to the warm side, it is a cold front; Conversely, when the warm air mass moves to the cold side, it is a warm front. Frontal transit areas are often accompanied by changes in temperature, rain and snow, high winds or sandy weather.

3) Cyclones and anticyclones: cyclones are accompanied by low pressure and are characterized by rainy weather; An anticyclone is accompanied by high pressure and is characterized by fine weather. The position of a place in a cyclone or anticyclone determines the direction of the wind in that place.

Understanding the process, severity and impact of climate change on different regions is still evolving, and scientists have confirmed the following: 6 1 Certain gases, such as carbon dioxide, create a greenhouse effect in the atmosphere, preventing heat from being reflected back into space, causing the Earth's temperature to continue to rise 6 1 Burning fossil fuels (e.g., coal, oil, etc.) releases more carbon dioxide into the atmosphere 6 1 Although carbon dioxide is not the strongest greenhouse gas, the amount of carbon dioxide produced by human activities has increased significantly, 6 1 Carbon dioxide concentrations in the atmosphere have reached their highest level in 650,000 years 6 1 The 90s were the hottest decade in history, and 1998 was the hottest year of all

6 1 As a result of the emission of greenhouse gases such as carbon dioxide, it seems inevitable that the global average temperature will rise by degrees Celsius above pre-industrial levels. Limiting the rise to well below 2 degrees Celsius is the only way to prevent climate change from causing greater catastrophe 6 1 If greenhouse gas emissions are left unchecked, the rate of climate change will be the fastest in human history 6 1 The climate feedback mechanism is likely to have a sharp and irremediable ripple effect, and no one knows to what extent climate change will lead to the "end of the world".

The main causes are as follows: 1. Impact of La Niña events Since August 2007, the sea surface temperature (SST) in the eastern equatorial Pacific Ocean has developed rapidly since entering a La Niña state, and from January 2008 to January 2008, the sea surface temperature has been lower than normal for six consecutive months. The analysis shows that this La Niña event is the most rapid development since 1951, and it is also the most cumulative intensity in the previous six months.

This La Niña event is expected to last at least until late spring and could become a stronger La Niña event. Since the beginning of winter, the distribution characteristics of precipitation anomalies in China are very similar to those after the occurrence of strong La Niña events in history, indicating that the current La Niña events are one of the important reasons for the large-scale continuous low temperature, rain and snow in eastern China. 2. Abnormal atmospheric circulation The rare, continuous and stable abnormal atmospheric circulation in Eurasia is the direct cause of large-scale low-temperature, rain, snow and freezing disasters.

This atmospheric circulation anomaly is mainly manifested in four aspects: First, since January, the atmospheric circulation in the middle and high latitudes of Eurasia has been high in the west and low in the east, and this circulation anomaly has lasted for 19 days (the average climate in January is 6 days), which is more than three times that of the multi-year climate and the longest continuous circulation pattern since 1951, which is conducive to the continuous invasion of cold air into China from the northwest along the Hexi Corridor. Secondly, the subtropical high in the northwest Pacific is strong and northerly, and the position of the strong subtropical high is stably maintained over the ocean in the southeast of China, and has extended westward many times, so that the main area of cold and warm air convergence is located in the middle and lower reaches of the Yangtze River and its adjacent areas south of China.

Third, the southern branch of the southern plateau is active in the southern edge of the Tibetan Plateau, which is rare in the past ten years, which promotes the transport of warm and moist air from the southwest to China along the Yunnan-Guizhou Plateau. Fourth, due to the convergence of cold and warm air, warm and moist air is above, forming a stable inversion layer in the middle and lower troposphere, which is the main reason for the occurrence of large-scale freezing rain.

The weather changes depending on the season! People can affect their lives because of their mood!

Meteorology is the study of weather changes, and the study of the physical, chemical, and dynamic properties of the atmosphere analyzes the causes of weather changes.

Finally, the wind speed is also one of the factors affecting weather changes. Wind speed refers to the speed at which air moves, and when the wind speed increases, it brings more water vapor, causing the weather to become rainy or stormy. And when the wind speed decreases, the weather will become clear or hazy.

First of all, the change in temperature is one of the main factors affecting the change of weather. Changes in air temperature affect the stability of the atmosphere, which in turn affects changes in the weather. For example, when the temperature rises, the water vapor in the atmosphere will evaporate, forming clouds, causing the weather to turn cloudy or rainy. When the temperature drops, the air becomes dense and the water vapor in the atmosphere condenses into fog or frost, resulting in colder weather or frost.

In summary, weather changes are caused by the interaction of many factors. Only through the study and analysis of these factors can we accurately improve weather changes and provide better services for people's production, life and travel.

In summary, weather changes are caused by a variety of factors. Only through the study and analysis of these factors can we accurately improve weather changes and provide better services for people's production, life and travel.

Secondly, humidity is also one of the important factors affecting weather changes. Humidity refers to the amount of water vapor in the atmosphere, and when the humidity increases, the water vapor will condense into clouds, causing the weather to become cloudy or rainy; And when the humidity drops, the air becomes dry and the weather becomes sunny or dry.

Over the past 100 years, the global average temperature has experienced two fluctuations, cold and warm, and the overall trend is upward. In the eighties, global temperatures rose significantly. The specific reason for the global warming trend is that the carbon dioxide produced when people burn fossil minerals to generate energy or cut down forests and burn them enters the Earth's atmosphere.

According to climate models, global temperatures are estimated to rise by about one degree Celsius (Fahrenheit) by 2100. According to this**, global temperatures will change dramatically not seen in the past 10,000 years, with potentially significant impacts on the global environment. Global warming causes the Arctic and Antarctic ice to melt, and after the glaciers melt, a large amount of fresh water is injected into the ocean, reducing the salinity of the ocean, disrupting the original equilibrium and blocking the warm current from the equator, causing the climate to become colder, and if the warming continues, the earth will enter an ice age.

Global warming will also lead to a decline in the climate. Doesn't it mean global warming? Why do temperatures seem colder this year?

This year, the weather is unusually cold! In fact, there was a similar phenomenon in the Qing Dynasty more than 100 years ago. In the last 5,000 years, China's coldest climate has occurred during the Qing Dynasty.

At that time, it was the 18th year of Guangxu (1892-1893), the Qiantang River in Hangzhou was completely frozen, and the whole territory of Guangzhou was snowed heavily, and in some places it reached 1 foot of snow. This is just the alternation of the warm period and the cold period, looking back on the past 5000 years, China's historical period can be divided into 4 warm periods and 4 cold periods, China's climate is a "whirlwind decline" process, the warm period and the cold period alternate, the cold period is longer and colder than the other. There shouldn't be any worries.

Compared to the climate of the past 5,000 years, our current climate is neither the coldest nor the warmest.