When the sunshine conditions reach a certain level, it is () that causes obvious changes due to the change of sunshine.

When the sunshine condition reaches a certain level, it is the temperature that causes obvious changes due to the change of sunshine. The specific reasons are as follows

1, heat accumulation: When the sunshine increases, the heat in the surface and atmosphere will increase. This accumulated heat will lead to an increase in temperature. In a day, the temperature is usually lower in the morning and evening, but it will increase at noon and afternoon, which is related to the increase of sunshine time and the accumulation of heat.

2. Convection enhancement: the change of sunshine conditions will also affect the convection movement of the atmosphere. When the sunshine is sufficient, the convection movement in the atmosphere is enhanced, and the hot air rises to form a high-pressure area, while the cold air sinks to form a low-pressure area. This convection movement will lead to the difference and change of temperature, which will make the change of weather and climate more obvious.

3. Energy conversion and water evaporation: sunlight not only directly heats the earth's surface and atmosphere, but also can be converted into bioenergy through photosynthesis of plants. This energy conversion will affect the balance and stability of the ecosystem, thus affecting the change of temperature. Sunshine conditions will also affect the evaporation of water. When there is plenty of sunshine, the surface water will evaporate quickly, thus taking away a lot of heat and lowering the temperature.

4. Climate impact: Long-term climate change will also be affected by sunshine. The change of sunshine conditions will affect the atmospheric circulation, precipitation distribution, ocean circulation and other climate systems, thus affecting the change of global temperature. For example, the change of sunshine caused by the change of the earth's orbit is one of the key factors in the ice age and warm period.

Knowledge about sunshine

1, sunshine time and length: sunshine time refers to the time when the sun rises from the horizon, crosses the sky and falls on the horizon. The length of sunshine is influenced by geographical location, season and weather. The sunshine time in summer is usually longer than that in winter.

2. Sunshine and climate: Sunshine is one of the important factors affecting climate. It directly heats the earth's surface and atmosphere, and affects the convective movement and water evaporation of the atmosphere. Therefore, the amount and change of sunshine will affect climate factors such as rainfall, wind and temperature.

3. Sunlight and living things: Sunlight has a wide influence on living things. Plants use sunlight energy to convert carbon dioxide and water into organic matter through photosynthesis, providing energy for ecosystems. Animals regulate their body temperature, behavior and living habits through sunlight.

4. Sunlight and human life and environment: Sunlight also has an important influence on human life. It affects people's circadian rhythm, sleep quality, mood and so on. In winter, people need more sunshine to keep healthy and balanced. Sunlight will also affect the environmental quality. Too much sunshine will lead to the increase of ground temperature and aggravate the urban heat island effect. At the same time, excessive ultraviolet rays can also cause harm to the human body.