| As an important indicator of climate change,surface temperature has a great influence on the composition,structure,formation and evolution of soil.Analysing the spatial-temporal variation of surface temperature itself and its relationship with the geographical location and climate provides important scientific insights into the mechanism of interactions between land and air,the regulatory response to climate change,and the future trends in the prediction of surface temperature.Liaoning Province is located in the transition zone from Inner Mongolia Plateau to Bohai Bay.The terrain and terrain are complex,which makes the climate in different parts of the province have obvious differences.In addition,Liaoning Province is located in the seasonally frozen area,making the surface temperature change mechanism more complex.In this paper,the daily surface temperature data materials and the meteorological elements(mean air temperature,sunshine hours,average wind speed,and precipitation)of 24 meteorological stations in Liaoning Province from 1960 to 2016 are selected,and the climatic trend rate method and distribution function are used.Mann-Kendall mutation analysis,wavelet cycle analysis,empirical orthogonal function(EOF)analysis,and correlation analysis method were used to systematically analyze the temporal variation characteristics,spatial variation characteristics of land surface temperature and the relationship between surface temperature factors in Liaoning Province.The following conclusions are obtained through analysis:(1)There are significant differences in the land surface temperature of Liaoning Province in different decadal variations.Land surface temperature was lower than the annual average surface temperature in the 60 s and 80 s of the 20 th century,and it was higher than the average annual surface temperature in the 1990 s to the 21 st century.Inter-annual variation with time to warm trend,the rate of change has reached 0.36 °C/10 a,in which the surface temperature in winter warming amplitude is the largest;annual surface temperature in Liaoning Province in the mutated in 1995,the test shows that the increase trend is significant.There are two time scales of 30-46 a and 19-25 a in the annual surface temperature cycle variation in Liaoning Province.(2)The annual surface temperature in Liaoning Province gradually decreases from southwest to northeast.With time,the areas with the highest temperature increase range from eastern Liaoning to southern Liaodong Peninsula.Using the EOF method to analyze the regional characteristics of surface temperature in Liaoning Province,the first eigenvector modality shows that the province has a constant trend of increasing temperature,meanwhile,the surface temperature is in the distribution pattern of high to low in the west,and the surface temperature changes most in eastern Liaoning and coastal areas.(3)There is a significant negative correlation between annual surface temperature and longitude and altitude in Liaoning Province.Land surface temperature and latitude have a negative correlation between the annual and autumn winter seasons,and there is a positive correlation between latitude and temperature in spring and summer.The correlation between land surface temperature and air temperature shows a distribution pattern that is high in the west and low in the west.It is the western region of Liaoning Province.The relationship between temperature is more intense than that of the eastern region.In the relationship with precipitation,the surface temperature in the year with high precipitation is relatively low,and the effect of precipitation is most significant in summer and autumn.Land surface temperature and sunshine hours in each season and year show opposite trends.surface temperatures in spring and summer are positively correlated with sunshine hours,negatively related to annual and autumn and winter temperatures,and annual and seasonal surface temperatures in Liaoning.The wind speeds are all negatively related.Among them,the summer correlation is very small.Considering the summer land surface temperature is mainly affected by temperature,sunshine,and precipitation,the influence of wind speed on surface temperature becomes less obvious. |
PDF Full Text Request