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Test the amount of snow Photo courtesy of Jiuquan Satellite Launch Center
China News Service, Beijing, December 16 (Chang Yanling, Li Yunxi, Wang Ruilin, Guo Chaokai) Shortly after the last search exercise for returner Chang’e-5 ended, snow fell on the landing field. of Siziwangqi. What to do if Chang’e 5 finds snow and wind on his way home? The reporter learned from the Jiuquan Satellite Launch Center on the 16th that the meteorological team had already predicted this snowfall four or five days ago. The team will “scan the wind and observe the snow” to provide precise weather protection for the landing of Chang’e-5.
Staff assessed the amount of snowfall Photo courtesy of Jiuquan Satellite Launch Center
This heavy snowfall is also the fifteenth snowfall in the Siziwangqi area since the beginning of winter this year. When converted to precipitation, it has reached 14.4mm, which is much more than the 4mm average in previous years. The Siziwang Banner landing zone is huge and the grassland weather is unpredictable. If the returning Chang’e-5 finds snow on the day it lands, the air search unit’s helicopter may not be able to take off to search and rescue. In order to provide accurate meteorological data support for superior command and decision making, the meteorological unit was combined with historical data from the past 30 years to focus on monitoring the impact of the cold Siberian current, precipitation and other important indicators.
In addition to the impact of snowy weather, whether the wind direction and speed can be accurately predicted is directly related to whether the search and recovery team can successfully find the target. If the wind speed is too high, the return device is likely to float out of the designated landing zone, increasing search and rescue difficulty.
Kang Lin, deputy director of the Meteorological Bureau of the Jiuquan Satellite Launch Center, said: “When there is no wind or when the wind is small, the one who returns lands in a certain place. When the wind is very strong, it can deviate several dozens due to the influence of the wind on the parachute. ” Even hundreds of kilometers. We have to calculate and form a report conclusion based on changes in wind and wind direction at any time to ensure that headquarters can form a more accurate forecast of the landing point. “
Staff release high-altitude sensing balloon Photo courtesy of Jiuquan Satellite Launch Center
To ensure this mission, the meteorological team stationed at the landing area 3 months in advance, 24 hours a day, uninterrupted observation of temperature, humidity, pressure, wind direction, wind speed and other meteorological data from the ground to 25 kilometers above the ground, and launched high-altitude detections to zero daily. balloon. On the day of the return landing, the number of high-altitude sensing balloons launched was increased to approximately 8, to minimize measurement errors and increase the accuracy of the forecast data.
Kang Lin told reporters that near the mission window, the frequency of weather inquiries has increased from once a day to twice a day, comprehensively analyzing possible dangerous weather and accurately forecasting around the window of the mission. Based on current observations, there were no strong winds or snow on the day of return from Chang’e 5. Generally, the weather conditions are good. What we have to do now is to report the meteorological data in real time, quickly and accurately, and minimize the meteorological factors caused by the search and recovery of the returnee. Adverse effects. (End up)
