Performance Of RegCM-CLM4.5 In Simulating The Regional Climate Of Western Tianshan Mountain In Xinjiang,China

Global warming has become a fact,climate change has an important impact on forestry,at the same time,forestry also has some feedback on climate change,it is a great significance to research the adaptation of climate change and the response of the forestry.In this study,the research area is the western tianshan mountain in Xinjiang.Firstly,the study carried out the applicability simulation of climatic factors by using the regional climate model(RegCM4.5)coupling community land model(CLM4.5)(Hereinafter referred to as RegCM-CLM4.5),simulation time is from 2013 to 2016 in west tianshan mountains in xinjiang and horizontal resolution is 20 km,it lay the foundation for the pattern in the area of forest ecosystem research.The test includes three parameterization scheme and set on the applicability of the interannual and the four seasons.Mode based on the high performance computing environment of research Institute of Forest Resource Information Techniques,Chinese Academy Forestry,and through dynamic downscaling method to drive the reanalysis data in parallel environment,the model output the results every 6 hours,the results include annual and spring,summer,autumn and winter seasons of mean temperature,maximum temperature,minimum temperature,precipitation,wind speed,and carbon dioxide.At the same time using china meteorological data sharing network monitoring data of 66 weather stations to provide validation of simulation results.The results of the study are as follows:(1)First analyzed the pattern RegCM-CLM4.5 simulation of western tianshan mountains in xinjiang,the results show that: it can be a very good simulation of topography,the condition of land use structure and texture in the west of the tianshan mountains in xinjiang by downscaling RegCM-CLM4.5,and can also good simulate the overall distribution of the region's annual average temperature,maximum temperature,minimum temperature,precipitation and the wind speed,no obvious difference with the actual weather observation data.Model simulation of the regional temperature showed the highest temperature simulation effect is better than the annual average temperature and the lowest temperature simulation,and the temperature,maximum temperature and minimum temperature simulation scheme of RUN1,RUN3,ENS is better than scheme RUN2,model simulation of rainfall is also showing the rest of the scheme is better than that of RUN2,simulation of wind speed is small difference in different schemes.(2)Analyzing the model simulation of RegCM-CLM4.5 in western of tianshan mountain in xinjiang,it includes the temperature,maximum temperature,minimum temperature,rainfall and wind speed of spring,summer,autumn and winter.the results show that: the model of RegCM-CLM4.5 can good simulate the distribution of the four seasons climate factor,different parameterization scheme within the season on the average temperature,maximum temperature,minimum temperature and wind speed simulation is not sensitive,but there has little difference in the root mean square error of the case,the simulation show the scheme of precipitation RUN1,RUN3 and ENS is superior to the RUN2.The model simulation of the highest temperature is the best in different seasons,the others are average temperature and the lowest temperature,and the simulation of temperature,the highest temperature and lowest temperature show the effect of spring,summer,autumn is better in winter.Model simulation of the wind speed is also showing good simulation effect of spring,summer and autumn better than winter.But precipitation simulation performance of spring,summer,winter is better than autumn,and the scheme of RUN1 and RUN3 plan simulation effect is best in winter.(3)Analyzing the patterns of RegCM-CLM4.5 output value of carbon dioxide every 6 hours,the results show that: the pattern has good simulation effect of carbon dioxide in western tianshan mountain in xinjiang,the simulation of carbon dioxide is rising from 2013 to 2016,consistent with warming conditions.At the same time,the simulation of carbon dioxide is not sensitive with the three scheme of RUN1,RUN2,RUN3.