Spatio-temporal Variation Of LST In The Middle Tianshan And Typical Basin

Land surface temperature,which plays an important role in surface energ y balance and surface physical processes,is important surface parameters in e cological process.Land surface temperature including the earth surface tempera ture and water temperature,has great influence to meteorological and climate exploration.In Tianshan Mountains,the area is big and natural geographical e nvironment are complex.So we cannot monitor the ground temperature in all areas.Therefore,the tradition with "dot" observation method has already no w ay to satisfy the need in large area time observation in reality studying.The appearance of satellite remote sense has made it possible to solve this proble m,so the LST satellite remote sense back-calculation has got many researcher s as a result to take it seriously.Tianshan Mountain belongs to the temperate continental arid climate,and vegetation coverage is an important influence on the climate and natural environment changes in the middle of the Tianshan Mountains,and can also change the surface temperature.Therefore,studying t he spatio-temporal variation of LST and the analysis of influencing factors are important scientific bases for effectively adjusting LST in mesocale,and has significantly roles of improving warming and protecting natural environment.T his thesis,basing on the 3S technology,has carried out Spatio-temporal Variati on of surface temperature and territorial differentiation of the typical northwest arid region.Based on the MOD11A2 data,which can obtain LST data of th e inter-annually and monthly of the Tianshan Mountain for 2001-2017 years.Making use of the data,have discussed the evolution law and characteristics t he Spatio-temporal Variation of surface temperature.Research shows that:(1)MODIS LST product is enough to apply for the analysis of spatio-te mporal distribution characteristics of land surface temperature in Tianshan mou ntain(mean R=0.97).In space,The tropical and physiognomy condition can s eriously influence the entire boundary spatio-temporal of surface temperature i n Tinshan mountain.The temperature over all distribution is decided by the si erra and the basin,and the temperature of Tianshan mountain region is low a nd the temperature of Turpan basin is high.Under this surface temperature ov erall pattern,the LST of southern regions in Tianshan is higher than the north ern regions in Tianshan,regardless of in the bare soil or in the water body,which can seriously express the non-uniformity of the distribution of the ther mal resources in the space.(2)Trend analysis was used to reflect the variation trend of surface temp erature in the annual and seasonal change from 2001 to 2017.In the middle Tianshan presented apparently trend distribution,the LST trend was classified as slight increase,basically unchanged and severely reduced,and their corresp onding percentage of area are 33%,17% and 3% respectively;belong to sligh t increase and basically unchanged area of LST are dominant.(3)We can conclusion from the results that effect of environmental factors on LST in the Tianshan mountains.The relation between the DEM and LST assume negative correlations,the trend has seriously express of LST decline gradually with the elevation of DEM.The spatial distribution of LST is relate d to land cover types,and the order of LST intensity by land cover types is bare soil> sparsely shrubby forest> residence land> sparse grassland > dry lan d> broadleaved deciduous forest> lake> grass land> bare rock> meadow> glac ial Snow.(4)The spatio-temporal distribution characteristic of the interannual surface temperature of Tianshan mountain and region area has shown significant diffe rences.The order of LST intensity by interannual is Turpan basin> Tianshan mountain > Bosten Lake Basin> Ili River Valley.The highest annual surface t emperature is the Turpan basin,it is 12.75?,the lowest surface temperature i s Ili river valley,it is 4.01?.