Why is the daily variation of climate and temperature in plateau mountainous areas large?

Because of the low surface properties and atmospheric water vapor content, the plateau mountainous area has small heat capacity, large temperature change range and large daily temperature difference.

Generally speaking, the climate and temperature in plateau mountainous areas are less than those in similar surface plains at the same latitude in the annual variation range. It is determined by the highest and lowest temperatures in a year. The highest temperature in summer in plateau mountainous areas is low.

Reference:

annual range of temperature

The difference between the hottest month of the year and the average temperature in Leng Yue is called the temperature annual range. The annual temperature varies with latitude, land and sea distribution and topography. The temperature annual range generally increases with the increase of latitude. The annual temperature difference in low latitudes is very small, only 65438 0 ~ 2℃; In mid-latitude areas, the temperature annual range increases, generally reaching10 ~ 20℃; At high latitudes, it can reach above 30℃. In low latitudes, the length of day and night in a year is almost equal, and the change of solar altitude angle at noon is also very small, and the monthly heat budget is not much different, so the annual variation of temperature is very small. In the middle and high latitudes, the solar altitude angle is large at noon in summer and the daytime is long; Winter is the opposite. Therefore, the heat obtained in winter and summer is very different, so the temperature is higher in the year. At the same latitude, the annual average temperature on land is higher, but the temperature in the ocean is lower. Mid-latitude inland, the annual temperature can reach 30 ~ 40℃, and the ocean is only 10 ~ 15℃. Because of the different physical properties of land and ocean, the temperature of ocean is very slow. The temperature annual range varies with topography and ground conditions. Generally speaking, the temperature annual range is convex and less than concave. Vegetation coverage area is smaller than bare land.

Diurnal temperature range and annual range

The difference between the highest temperature and the lowest temperature in a day is called daily range. The daily temperature range varies with latitude and season, and it is also related to the surface properties and weather conditions. Turpan basin in northwest China is known as "wearing fur coats in the morning, wearing shirts in the afternoon, and eating watermelons in the stove". In areas with large daily temperature difference above 15℃, there is generally plenty of sunshine in the daytime, strong solar radiation and high temperature, which is beneficial to plant photosynthesis and can produce and accumulate more nutrients. The lower the temperature at night, the weaker the respiration of plants and the less energy they consume, which is beneficial to the storage of sugar. So Xinjiang cantaloupe is big and sweet.