Study On Glacier Change And Its Response To Climate In Tomur Mountain National Nature Reserve

Glacier national nature reserve,this article selects the tomsk's peak as its research object,by 1992,1997,2010 and 2018,a total of four remote sensing image as the main data source,used the threshold segmentation method to extract its glaciers,gain reserve ice distribution and will reserve the glacier area is divided into ten levels.On this basis,the number and area of glaciers in the reserve were counted.Considering the glacier change lag behind climate change,on the basis of 12years lag.Will reserve climate change will be divided into six periods,by using linear regression analysis of reserve tendency of temperature and precipitation in 39years,thus the interannual variability of temperature and precipitation trend,seasonal change trend,thus further explore glacier response to climate change.Through the analysis,the author draws the following conclusions:(1)From 1992 to 1997,the glacier area in the Tomur Peak National Nature Reserve decreased slightly but not by a large amount.The glacier area decreased by0.13km².From 1997 to 2010,the area of glaciers in the reserve decreased from1926.62km² to 485.96km²,and the area of glaciers decreased significantly,a total of1440.66km².From 2010 to 2018,the glacier area increased slightly,with a total increase of 159.15km²,with an average annual growth rate of 19.89km²·a^-1.From 1992to 2018,the maximum glacier area was 1 926.75km²(1992)and the maximum glacier coverage rate was 55.92%.The minimum glacier area was 485.96km²(2010)and the glacier coverage rate was 14.10%.In 26 years,the glacier area decreased by1281.64km² with an average annual change rate of-49.29km²·a^-1.(2)During the period from 1992 to 1997,the glacier reserves in the Tomur Peak National Nature Reserve decreased slightly and there was no significant difference between the two.The glacier reserves only decreased by 0.10km³ in 5years.From 1997 to 2010,the glacier reserves in the reserve decreased from1087.86km³ to 169.42km³ with a significant decrease of 918.34km³ and an average annual change rate of-70.64km³·a^-1.From 2010 to 2018,the glacier reserves showed an increasing trend,increasing from 169.42km³ to 248.35km³,with an increase of78.93km³,and an average annual growth rate of 9.87km³·a^-1.During the period from1992 to 2018,the glacier reserves in the reserve experienced a trend of decreasing first and then increasing,with the maximum of 1,087.86 km³(1992)and the minimum of169.42km³(2010),a total reduction of 839.51km³,and an average annual reduction rate of 32.29km³·a^-1.(3)During the period from 1992 to 1997,the total number of glaciers and the number of glaciers of each area size did not change,while the total area of glaciers and the changes of glaciers of each area class were not significant.Between 1997 and2010,the total number of glaciers increased from 47 to 59.From 2010 to 2018,the number of glaciers decreased by 34,and the total area of glaciers increased by32.75%.From 1992 to 2018,both the number of glaciers and the area of glaciers in the reserve were shrinking.Among them,the number of glaciers has decreased from 47 to25,a total of 22.Glacier area decreased by 66.52 percent.(4)From 1980 to 2018,the annual average temperature and precipitation showed an upward trend,and the linear rate of change was 0.30?·(10a)^-1 and19.10mm·(10a)^-1,respectively.Through the significance level 0.05 test,the phenomenon of temperature and humidity increase was obvious.Among them,summer air temperature,winter air temperature,summer precipitation and winter precipitation all showed an upward trend and their linear change rates were0.24?·(10a)^-1,0.19?·(10a)^-1,12.32mm·(10a)^-1,1.57mm·(10a)^-1,respectively.Temperat ure increase in summer,precipitation in summer and precipitation in winter all passed the test of significance level of 0.05.(5)Overall,1992-2018 years of Tomuer peak national nature reserve,the reduction of glacier area and protected areas have a great relationship temperatures rise,although precipitation is on the rise,but the increasing of the precipitation of glacier accumulation is not enough to compensate for the temperature rise caused by melting glaciers,glacier reserve overall showed a trend of decrease.