China News Service, Xining, March 12 (Sun Rui) A reporter learned from the Qinghai Meteorological Bureau on the 12th that due to the intensified plateau warming and humidification trend, the largest snow area in the southern pastoral area of Qinghai Province, which is located at the source of the Three Rivers, has been less in the past five years. About 5 to 20 days; the number of days for maintaining snow cover is generally 0 to 5 days.
The satellite remote sensing data monitoring of the Qinghai Provincial Meteorological Research Institute shows that since the beginning of winter last year, Qinghai has had less snow, the cumulative snow area is small, and the number of snow days is less.
The maximum snow cover area in Qinghai Province has decreased by 54% compared with the previous year, and by nearly 26% compared with the past five years; the cumulative number of snow cover days in most areas of Qinghai is less than or equal to 30 days, which is less than 5 in the Sanjiangyuan area compared with the past five years. To about 20 days; the number of days for maintaining snow cover is generally 0 to 5 days.
Statistical analysis shows that in December 2020, the average precipitation in Qinghai Province is 1.2 mm, which is 25% less than the 1.6 mm in the same period of normal year, which is the lowest in history since 2011. Among them, Yushu, Maqin, Qingshuihe and Qingshuihe, which are located in the source of the three rivers, There was no precipitation in the eight areas of Dari, Tuotuohe, Zhiduo, Qumalai and Wudaoliang for the whole month.
From February 27 to 28 this year, the daily maximum temperatures of 12 stations in the core area of Sanjiangyuan, including Zaduo, Qingshuihe, and Yushu, ranged from 9.4 degrees Celsius to 18.6 degrees Celsius, all exceeding the historical extreme value of the daily maximum temperature in February.
"Since February, the Yushu area has had very little precipitation and high temperatures. Especially on February 28, the daily maximum temperature in many places hit a new historical extreme in February. Among them, Yushu City broke through the 30-year extreme daily maximum temperature, exceeding the historical extreme. 1.5 degrees Celsius; with the exception of Qumalai County, the rest of the counties have also exceeded the extreme daily maximum temperature in the past 20 years, exceeding the historical extreme value of 0.4 degrees Celsius to 2.1 degrees Celsius." said Wei Yongliang, director of the Yushu Prefecture Meteorological Observatory of Qinghai Province, the climate this year is relatively abnormal. , Is also very rare, this season generally does not happen, for this reason, this also shows that the plateau warm and humid trend is intensified, and the temperature in the source of the three rivers is rising.
In addition, according to investigations and monitoring by scientific research institutions, affected by rising temperatures, the largest glacier at the source of the Yellow River-the Animaqing Glacier snow line has melted more than 100 meters in five years, and the current glacier area is still in a state of continuous retreat.
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