What causes snow in the mountains? What is the reason for the rise of snow cover in the snow capped

The higher the mountain, the thinner the air becomes, and the easier it is for the sun to lose heat. About every 100 meters of elevation, the temperature will drop by about 0 6, so at a certain altitude, the temperature will drop below 0, and the ice and snow will not melt all year round. The boundary of this height is called the snow line.

The closer you are to the poles, the lower the snow line will be, as the weather there is already colder; And the closer you get to the equator, the higher the snow line will be. In addition, after the top of the mountain is covered with ice and snow, due to the strong effect of reflecting sunlight on the surface of the ice and snow, the sunlight that shines here, generally 50 90 The light and heat are reflected back, so that the temperature here is lower, and the ice and snow are not easy to melt. Therefore, on the top of the mountain, which is higher than the snow line, snow will accumulate all year round.

Of course, there has to be snow falling here, and there has to be a place on the top of the mountain where you can accumulate snow flakes, so not all mountains can be stacked with snow and ice. The snow and ice on those snow-covered peaks are not absolutely year-round, and if there is strong sunlight, some will melt. However, it was soon replenished by snowfall, so that the snow and ice remained there and formed a downward movement of glaciers.

The higher the place, the greater the air pressure and the lower the temperature. Of course, the snow does not melt easily.

However, in recent years, the global climate has warmed, and the snow has melted very quickly.

Because the higher the mountain, the lower the temperature above it, and when the temperature is zero or lower, the water vapor on the top of the mountain will condense or condense to form snow.

Due to special wind and weather reasons.

The height of its distribution is mainly determined by temperature, precipitation and topographic conditions.

1. The altitude decreases from low latitude to high latitude, reflecting the influence of temperature. In western China, from the Qinghai-Tibet Plateau and the Kunlun Mountains to the north to the Tianshan Mountains and the Altai Mountains, the snow line height drops from 6,000 meters to 5,500 meters, 3,900 to 4,100 meters, and 2,600 to 2,900 meters. Further north to the Arctic, the snow line drops to sea level.

2. Under the same temperature, the height of the snow line depends on the amount of snowfall per year. On the Tibetan Plateau, the annual precipitation near the snow line is 500 800 mm, and the snow line is 5500 6000 m high. The Alpine snow line receives 2,000 mm of precipitation a year, and the height of the snow line is only about 2,700 meters. The annual precipitation in the eastern part of Qilian Mountain is greater than that in the western section, and the snow line rises from the east (4600 4700 m) to the west (5000 m).

3. The topography indirectly affects the height of the snow line by affecting the temperature and precipitation. The northern hemisphere is in the same mountainous area, and the snow line on the southern slope is usually higher than on the northern slope. However, in the Himalayas, the temperature and annual precipitation on the southern and northern slopes vary greatly, resulting in a snow line on the southern slope (4 500 m) that is 1 400 to 1500 m lower than the snow line on the northern slope (5900 to 6 000 m).

In summer, the snow line rises in the snow-capped mountains of the Tibetan Plateau because the temperature rises in summer, causing the snow line to rise. In summer, the temperature in the air halls of the Tibetan Plateau is higher than in winter, and the sunlight is more intense. These factors cause the snow to melt, causing the snow line to rise.

In winter, the snow cover line of the snow-capped mountains on the Qinghai-Tibet Plateau will drop because the temperature is lower in winter, which makes the snow cover of the snow-capped mountains increase. In addition, the wind speed on the Tibetan Plateau is also high in winter, resulting in frequent winds and snowstorms, which also contributes to the increase of snow cover in the snow-capped mountains.

Therefore, the snow cover line of the Tibetan Plateau Snow Mountains rises in summer and decreases in the winter due to seasonal changes and different climatic conditions.