Due to the influence of latitude factors, winter lasts for a long time, the temperature is low, the temperature stays below zero for a long time, and the snowfall can be sufficient; Due to the influence of topographic factors, the temperature in winter is also very low, which ensures sufficient snowfall, moderate terrain slope and open and flat front of the mountain, which is suitable for skiing. ?
If you are familiar with the history of the Winter Olympics, you will know that the venues of the Winter Olympics have been mainly concentrated in the middle and high latitudes of the northern hemisphere, especially in the middle latitudes, and this situation is mainly caused by the following two factors:
1. The venue of the Winter Olympics cannot be in a low-dimensional tropical area. The reason is self-evident, and I believe everyone understands it.
2. It is not suitable to report the Winter Olympics in high latitudes, because although the low temperature in high latitudes can meet the conditions of ice and snow, the low temperature in high latitudes can easily lead to frostbite of athletes. This is why Beijing and Zhangjiakou were chosen as the venues for the Winter Olympics, not the colder northeast.
In short, we should know that the events of the Winter Olympics are greatly influenced by the geographical environment, and wind speed and wind force, temperature and snow temperature will be taken into account. Therefore, the IOC has two core meteorological indicators when choosing the host city, namely, whether the average temperature in February is lower than 0℃ and whether the snowfall in February is greater than 30 cm. Usually, after analysis, the possibility that both indicators are greater than 90% is suitable for bidding.
In addition, the meteorological conditions such as heavy snow, fog, strong wind and strong temperature rise in the geographical environment have a great influence on the events of the Beijing Winter Olympics, which often leads to the interruption, schedule adjustment and even cancellation of the games. The online team of Beijing Senior High School Entrance Examination will share with you the requirements of different events for meteorological conditions.
The snow in skiing competition is generally Fu Na, and the snow temperature is generally < 0℃; The required temperature for biathlon and snowboarding is ≥- 18℃, and the average wind speed of 1 min is < 10 m/s; Skiing on the platform requires extremely high instantaneous wind speed, which is less than 3m/s and there is no crosswind. The headwind is more conducive to the competition, and the temperature is > -25℃.
The key of freestyle aerial skill is to watch the wind, and it is required that the average wind speed during the competition 1 minute is less than 3 meters per second; Alpine skiing and freestyle competition should increase visibility, which requires visibility > 2km and 5-minute average wind speed <10m/s; Cross-country skiing requires a temperature of > -20℃ and a 5-minute average wind speed of < 10 m/s.