What is popular science knowledge?
Weather refers to meteorological phenomena that occur in a short time (from a few minutes to a few days), such as thunderstorms, hail, typhoons, cold waves and strong winds.
What is climate?
Climate refers to the long-term average of various meteorological elements (month, season, year, year, even hundreds of years, etc.) in a certain area. It is a comprehensive reflection of the basic characteristics of cold, warm, dry and wet weather conditions in a region.
What are climate resources?
Climate resources Climate resources refer to natural substances and energy that are widely present in the atmosphere, such as light energy, heat energy, precipitation, wind energy, etc., which can be used directly or indirectly by people, and can form wealth and have use value. It is a very precious renewable natural resource and the basic condition for the survival and development of human society, and has been widely used in all aspects of the national economy and people's livelihood.
What is microclimate?
Microclimate microclimate in the same climate background. The terrain orientation, soil conditions and vegetation in some areas are inconsistent, which makes this area have unique climatic conditions. The characteristics of microclimate are mainly manifested in the drastic changes of individual meteorological elements and the differences of individual weather phenomena.
What is the urban climate?
Urban climate is a local climate or microclimate formed under the macro-climate or regional climate background due to the influence of urbanization. The urban climate is characterized by five islands, namely, heat island, wet island, dry island, rainy island and mud island.
What is the heat island effect?
Heat island is a comprehensive phenomenon of microclimate change caused by people changing the urban surface, and it is one of the most obvious characteristics of urban climate. Due to the acceleration of urbanization, dense urban buildings, asphalt roads and cement pavements have greater heat capacity and heat absorption rate than the soil and vegetation in the suburbs, which makes the urban area store more heat and radiate it to the surrounding areas and the atmosphere, resulting in the temperature in the urban area being generally higher than that in the surrounding suburbs at the same time. The high-temperature urban area is surrounded by low-temperature suburbs, just like an island in the sea of Wang Yang. This phenomenon is called urban heat island effect.
Why is the air pressure higher in winter than in summer?
Air pressure refers to the pressure produced by the air column per unit area on the earth. The air pressure in a place often changes. When the air pressure drops, it is rainy, the weather rises and the weather turns fine. There are many reasons for the change of air pressure. The change of temperature is a very important reason for the change of pressure. When the air is cooled, the air contracts, the density increases, the weight of air column per unit area increases, and the air pressure also increases. Therefore, the arrival of cold air is always accompanied by the increase of air pressure; When warm air comes, the air pressure tends to drop. Winter is a world of cold air and summer is a world of warm air, so obviously, the air pressure is high in winter and low in summer.
The Formation of "Rain Song"
In early winter or late winter, sometimes there is a strange phenomenon: when the liquid rain falling from the air falls on branches, wires or other objects, it will suddenly freeze into a layer of smooth and glittering ice, which is called "Song Yu". What is this phenomenon of dripping water into ice? In fact, the raindrops here are not ordinary raindrops, but supercooled raindrops. This kind of situation is not common, only when cold and warm air meet and warm air is strong. This is a lower temperature (slightly lower than zero degrees Celsius) layer near the ground, with an air layer or cloud layer above zero degrees Celsius, and then a cloud layer below zero degrees Celsius. Snowflakes falling from here melt into raindrops when passing through the warm layer, and then enter the cold air layer near the ground, and the raindrops quickly cool down. Because the diameter of these raindrops is very small, although the temperature drops below zero degrees Celsius, they fall before freezing and get cold when they touch the ground.