| In the past 20 years,the global climate has continued to warm,and the lake surface In the past 20 years,the global climate has continued to warm,and the lake surface water temperature(Lake Surface Water Temperature)is constantly changing due to global warming and other factors.The lake surface water temperature has a significant impact on the ecology and human environment of the lake's basin.Especially for urban lakes like Dianchi Lake,the impact of urban lakes on its surrounding cities is selfevident.The outbreak of cyanobacteria blooms is also closely related to the changes in the surface water temperature of the lake.Dianchi Lake is a typical plateau urban lake,which affects the climate and development of Kunming.Exploring the influence between air temperature and the surface water temperature of the lake,and studying the impact of the temperature difference between day and night in the Dianchi Basin on the surface water temperature of Dianchi Lake is to provide a theoretical basis and foundation for better protection and management of Dianchi Lake,and the visualization platform can better display the climate of Dianchi Lake,The change of water temperature.In this paper,the Dianchi Lake Basin is used as the research area.The basic data are the temperature(day,night)data,MOD11A2(day,night)data,Landsat and DEM data of the Dianchi Lake Basin from 2001 to 2018,and the trend analysis,mutation analysis and other methods are used to analyze The average annual,seasonal,and monthly averages of Dianchi Lake's daily temperature,night temperature,day-night temperature difference,daytime water temperature,night water temperature,and daynight water temperature change characteristics(including change trends and sudden changes)in Dianchi Lake Correlation analysis of water temperature is carried out,and Pearson coefficient is used to express the correlation between the two in the course of time.The research results show:(1)The annual average daytime and night temperature are rising.The rising rate of daytime temperature is 0.0065?/year,which is a nonsignificant increase,while the rising rate of nighttime temperature is 0.0228?/year.The average annual nighttime temperature The rate of temperature rise is greater than that of daytime temperature.Therefore,in the past 20 years,the diurnal temperature difference in the Dianchi Lake Basin has gradually decreased,which indirectly indicates that Dianchi's ability to regulate the surrounding climate is decreasing.The daytime and nighttime temperatures in spring,summer,and autumn are all rising.The night temperature rise rate in the three seasons is higher than the daytime temperature rise rate.Therefore,the difference in temperature between day and night in the three seasons of spring,summer and autumn is between 2001 and 2018.The gradual decrease further proves that the water body of Dianchi Lake is reducing its ability to regulate the surrounding environment.(2)The average annual daytime water temperature and nighttime water temperature are both insignificantly rising.The daytime water temperature in spring,summer and autumn are all rising.The rising rate of daytime water temperature and night water temperature in spring is 0.0125?/ It can be concluded that the surface water temperature of Dianchi Lake gradually decreases in spring.In other words,the water body of Dianchi Lake dissipates more heat to the atmosphere during the day and night,causing the surface water temperature of Dianchi Lake to drop.(3)The temperature difference between day and night in the Dianchi Lake Basin on different time scales has different effects on the surface water temperature.On the annual average scale,the temperature difference between day and night has no significant correlation with the average water temperature of day,night,day and night and the difference of day and night water temperature on the seasonal scale.In spring,the correlation between day and night temperature difference in spring and daytime water temperature is more significant.In summer,day and night temperature difference is negatively correlated with day and night water temperature difference.In autumn,the correlation between day and night temperature difference and water temperature is not high.In winter,the difference between day and night temperature and daytime water temperature is not high.The correlation between day and night average water temperature is more significant.The temperature difference between day and night in Dianchi Lake Basin on the monthly scale is significantly correlated with the day and night water temperature,average water temperature,and day and night water temperature difference on the monthly scale,which has a greater impact on it.The temperature in Dianchi Lake Basin The time correlation between the temperature difference between day and night and the surface water temperature of Dianchi Lake is easier to see on a monthly scale.The difference between the average temperature between day and night has a greater impact on the surface water temperature.Finally,visual methods are used to show the data change process and data changes of air temperature and water temperature.The new React web script style framework and the Ant Design pro framework are used to design a visualization platform to present the Dianchi Basin during the day and night from 2001 to 2018.Changes and basic data of air temperature,temperature difference between day and night,surface water temperature of Dianchi Lake during day and night,and water temperature difference between day and night under different time scales and basic data. |
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