Geography Questions Snow Line, a geography multiple choice question, about the Snow Line

Snow line: The lower bound of perennial snow cover, i.e., the balance line where the amount of annual snowfall and the amount of annual melt are equal. (A low snow line indicates a lot of snow).

The windward slope has a lot of precipitation, so there is more snowfall, so there is more snow, so the snow line is low; The leeward side has less precipitation, which means less snowfall, so there is less snow and a high snow line.

The question is simple.

First of all, you need to know: high mountains, low temperatures, if there is perennial snow, the snow melts to absorb heat. Thus the temperature is not lower? Since the temperature is low, is it easy to freeze if there is rain?

In this case, there is a lot of precipitation on the windward slope. The ice is not too much.

You also need to know: what is the height of the snow line. The height of the snow line is the vertical distance from the ground to the lowest point of the perennial snow cover area in the mountains (which can be thought of as a line, but it is dynamic).

In this way, the height of the snow line is not far from the ground, and the height of the snow line is lower.

I think you may be confusing the snow line with the height of the snow line, so you can't use your subjective imagination.

When you study geography, sometimes you have to learn to associate. This is less feasible. I'm still talking about the past. Hey.

Happy New Year, friend.

In addition, the height of the snow line is also related to the temperature, the slope direction of the mountain peak (sunny, sunny) and the slope size.

Specifically, you can flip through the book and take a look. Huh

In layman's terms, the precipitation is large, and when the weather is cold, it is easy to freeze, so the snow line is formed, and the leeward slope has less precipitation, and the precipitation cannot reach the position of the windward slope, but because of the high altitude, it also has to be frozen, but there is not as much as the windward slope, so it seems that the snow line of the windward slope is lower than the leeward slope!

You're seeing questions about the southern and northern foothills of the Himalayas, right? Don't think of the mountains as being very short, and the snow line appears in the very high part of the mountain range, you think about it, there is a lot of precipitation on the windward slope, and the rain will freeze when it falls on the mountain because of the low temperature, so the accumulation of a lot will become snow, the more rain falls, the more snowdrifts, and the leeward slope has no rain, even if the temperature is low, there is no rain to form snow and ice, so the snow line on the leeward slope is close to the peak

If the mountains are high, precipitation will take the form of snowfall. You know that there is less precipitation on the leeward slope? Since there is little precipitation, there is no accumulation of snow.

The snow line is high if there is no snow accumulation. The windward slope has a lot of precipitation, so there is more snow accumulation than on the leeward slope. So the snow line is low...

The foehn effect on the leeward slope is obvious, the temperature is higher, and the precipitation is less, so the snow line is higher!

To add that retreat is to ascend, that is, the elevation of the snow line has increased.

The impact of global warming on the alpine mountains of Qinghai-Tibet should be b, and the amount of ice and snow in the Qinghai-Tibet region will decrease when the temperature rises, so that the alpine grasslands need less water, and the amount of river recharge is also reduced, and it is correspondingly drier. At the same time, the restrictive conditions for biological growth in the Qinghai-Tibet region are mainly too high altitude and poor thermal conditions, so a is correct.

1. The distribution height of the snow line is positively correlated with the air temperature, and the snow line is also high when the temperature is high. As the surface air temperature decreases from low latitude to high latitude, the general trend of snow line height distribution also decreases from low latitude to high latitude.

2. The precipitation is closely related to the height of the snow line: the greater the precipitation, the lower the snow line; The less precipitation, the higher the snow line. Because, under the condition of very little snowfall, to achieve the balance between snowfall and ablation, there must be a low annual average temperature (i.e., the position of the snow line must be high) so that the amount of ablation and evaporation can be reduced to very little; In the case of heavy snowfall, a high average annual temperature (i.e. the snow line must be low) is necessary to melt a large amount of snow to maintain a balance between snowfall and melt.

3. Specific to a certain mountainous area, it mainly depends on the strength of the influence of climate and landform. The influence of geomorphological factors on the snow line is mainly manifested in the mountain topography and slope upward.

The landlord, the slope is large, the steep mountain, the snow is easy to slide, which is not conducive to the preservation of the snow, and the snow line is high; Mountainous areas with small slopes are conducive to snow deposition and low snow lines. That's it.

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 annual precipitation. 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. Topography indirectly affects the height of the snow line by affecting 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).

Topographic snow lines are the snow lines that are actually visible on the ground. It is the lowest boundary of the slope that does not melt all year round snow on the slope in summer under the influence of topographic conditions such as slope aspect, slope and slope shape.

The climatic snow line is theoretically hypothetical, and it is hypothetical that there is a flat ground at a certain height that is only affected by regional climatic conditions, where the winter snowfall is just completely melted in the summer, and if the flat ground is higher than this height, perennial snow will be formed, and if it is lower than this height, there will be no snow, and this height line is called the climatic snow line.

Therefore, the topographic snow line is the embodiment of the ideal state of the climatic snow line. The climatic snow line is only affected by the climate, while the topographic snow line is the result of a combination of temperature, snowfall, and topography.

Snow line: The lower bound of perennial snow cover, i.e., the balance line where the amount of annual snowfall and the amount of annual melt are equal. The annual snowfall above the snow line is greater than the annual melt amount, and the snowfall accumulates year by year, forming perennial snow (or 10,000-year snow cover), which then becomes granular snow and glacial ice, and the glacier is a loss.

The snow line is a type of climate marker line. Its distribution is mainly determined by temperature, precipitation and topographic conditions. The infiltration height decreases from low latitude to high latitude, reflecting the influence of air temperature.

The lower boundary of the permanent snow cover zone in high latitudes and high mountain areas is called the snow line. Above the snow line, the temperature is low, and the annual ice and snow supply is greater than the ablation, forming a perennial snow cover area. Below the snow line, the temperature is high, and the annual ice and snow supply is less than the ablation amount, and it cannot accumulate ice and snow for many years, so it can only be a seasonal snow cover area; Near the snow line, the annual snowfall is equal to the annual ablation, reaching a dynamic equilibrium. Therefore, the snow line is also known as the zero balance line of solid precipitation.

In winter, because the temperature drops at this time, there is a lot of snow cover, and at the same time, it is also covered downward, so the snow line drops.

The snow line is the lowest altitude for snow in high mountains. Below this sail height, there is no snow cover.

The height of the snow line is first and foremost related to temperature:

1.At low latitudes, the temperature is still above 0 degrees even at relatively high altitudes, and the snow melts easily, while at high latitudes, the air temperature is low, and at lower altitudes, the temperature is below freezing, so the snow line decreases with increasing latitude.

2.The height of the snow line is related to the slope aspect: the temperature is high on sunny slopes, the snow line is also high, and vice versa on shady slopes. Therefore, in general, the snow breaking line is high in the southern hemisphere, low in the northern slope, and vice versa in the southern hemisphere.

3.The snow line is related to the amount of precipitation: where there is little precipitation, there will be no snow or ice, even if the temperature is below freezing.

Therefore, the highest risk of snow loss in the world is in the area where the subtropical high is located, not on the equator. In the same way, the southern slope of the Himalayas is the windward slope of the southwest monsoon, with heavy precipitation and hail, and the snow line is lower than that of the northern slope.

The snow line is clearly visible in this picture. The snow line is the lower limit of permanent snow cover.

There are two concepts that need to be understood in this question: 1. Snow line; 2. Glaciers.

1. Definition of snow line: the lower boundary zone of the permanent snow cover area in high latitudes and alpine areas, along which the annual solid precipitation and ablation are in balance.

The snow line is the lower bound of perennial snow cover, i.e., the equilibrium line where the amount of annual snowfall and the amount of annual melt are equal. The annual snowfall above the snow line is greater than the annual melt amount, and the snowfall accumulates year by year, forming perennial snow (or 10,000-year snow), which then becomes granular snow and glacial ice, and develops glaciers. The snow line is a type of climate marker line.

The height of its distribution is mainly determined by temperature, precipitation and topographic conditions. The decrease in altitude from low to high latitudes reflects the influence of temperature.

2. Definition of glacier: a natural ice body with a certain shape and self-movement formed by the accumulation of snow in cold areas for many years and metamorphism.

According to the size and shape of glaciers, glaciers are divided into continental ice sheets (abbreviated ice sheets) and mountain glaciers (also known as mountain glaciers or alpine glaciers). Mountain glaciers are mainly found in the high and mid-latitude mountain regions of the Earth.

Mountain glaciers are glaciers that form above the mountain snow line. There are various types, mainly hanging glaciers, cirque glaciers, valley glaciers, and flat-topped glaciers.