Temporal And Spatial Changes Of Land Use In Urban Agglomerations And Their Effects On Climate Change

China is currently experiencing a period of high-speed urbanization.In the course of urbanization in recent decades,there have been many environmental problems,among which climate change has been highly valued by social development and scientific research.In the process of urbanization,human activities and land use change(LUCC)are the two main ways of influencing climate change.Based on previous studies,this paper discusses its impact on regional climate from the point of view of LUCC.This paper has combed the research scale,research methods and basic conclusions of the past research at home and abroad firstly.Because the development of urban agglomerations in China is coordinated from land planning to urban function demarcation,it is the main mode of urban development in China in the future.This paper discusses the impact of urbanization on Yangtze Delta urban agglomeration(CSJ),Beijing-Tianjin-Hebei urban agglomeration(JJJ)and Chengdu-Chengdu urban agglomeration(CY)on the impact of climate on the scale of urban agglomerations using the Weather Research and Forecasting Model(WRF).Next,the author uses the MPI framework to build an 8-node high-performance computing environment,and performs several experiments on the WRF model to obtain the best experimental parameters to meet the needs of the simulation experiment.In the experiment,the land use change of the underlying surface was controlled as the only variable,and experiments were conducted using multi-period land use data of 1 km from 1990 to 2015.In the experiment of the Beijing-Tianjin-Hebei urban agglomeration between 1990 and 2010,the author used the land-use transfer matrix to analyze the state of land circulation in the two 10-year period before and after 2000,and found that LUCC of JJJ are intensifying after 2000.At the same time,the change of urban-rural construction land,cultivated land,forest land,and grassland are more interactive.In the two 10-year climate changes,meteorological factors such as temperature,precipitation,and wind speed vary with land use changes.The overall temperature increases,precipitation weakens in winter and summer increases,and wind speed weakens.The change was stronger in after 2000 than before 2000,and the summer change was stronger than the winter from 1990 to 2000.For the temperature elements with obvious changes,the author compares the urbanrural construction land expansion of the CSJ,JJJ and CY for horizontal comparison.The study found that the expansion of urban and rural construction land mainly comes from the adjacent cultivated land.Experiments simulated the temperature changes caused by the conversion of different farmland(dry land and paddy field)from three urban agglomerations to urban and rural construction land from 2000 to 2015.Quantitative calculation and qualitative analysis of the warming range of land conversion for different cultivated lands into urban and rural construction lands were carried out,and the single-day warming curve of the air temperature in the three change areas was analyzed.At the same time,fitting simulations were carried out from the spatial distribution of warming in three urban clusters,and the trend of temperature changes caused by changes in latitude and longitude between urban clusters was obtained.