Research On The Influence Of Precipitation And Latent Heat Of Condensation On The Plateau Heat Source In The Qinghai-Tibet Plateau

In order to explore the effects of plateau precipitation,latent heat of precipitation,and the effects on atmospheric heat sources,this paper statistically analyzes the characteristics of precipitation and low vortex precipitation through station data and high altitude vortex data sets.Based on this,analyzing OLR to invert precipitation,TRMM satellite precipitation and site precipitation data applicability,then get new data set to analyze the spatial and temporal changes in the latent heat of precipitation condensation and discuss its impact on atmospheric heat sources.The specific results are as follows:(1)The precipitation shows an increasing trend,mainly in summer in the plateau,there are 4a and 11 a cycle changes.The spatial distribution decreases from southeast to northwest.Precipitation climatic increase rates are mainly concentrated in the southern of the Kunlun Mountains and the southern of the northern Tibetan Plateau.(2)Precipitation in the plateau vortex shows an increasing trend.Summer is a concentrated period of vortex precipitation,which has a high correlation coefficient with precipitation at the plateau and frequency of vortex generation.The largecenter is located in the Anduo-Naqu-Suo area.(3)The daily precipitation of the plateau vortex is dominated by light rain,while the medium rain is the major contributor to the precipitation of vortex.Plateau vortex precipitation in the southwest of Tibet,Qinghai and western Sichuan showed a clear increase trend.The precipitation of Light rain showed a increase trend throughout the region.The rising trend of moderate rain is mainly concentrated in the southwest of Tibet,Qinghai,and westest of Sichuan.(4)It is found that the OLR inversion data is superior to the TRMM satellite data,but the results are biased in the eastern plateau by analyzing correlation coefficient,root mean square error,and average absolute error.The precipitation latent heat data were obtained from 67 observation stations in the eastern part of the plateau and 20 stations from the western OLR inversion.(5)The latent heat of plateau precipitation fluctuates sharply both in summer and rainy seasons,and summer is higher than rainy season.There are 2a and 5a cycle changes.July has the most latent heat of precipitation,and it is the least in May.Precipitation condensation latent heat high value years,atmospheric circulation is conducive to the formation of precipitation,low value years is not conducive to the formation of precipitation.(6)In the rainy season,the latent heat of precipitation is high in the east and low in the west in the plateau,with large values concentrated in Linzhi in Tibet,west of Sichuan,and northeast of Yunnan.Summer is higher than the rainy season,and the western plateau is increasing.The precipitation of latent heat of precipitation in May was low and released in June.July decreased(except for Rikaze and Changdu areas).In August,the latent heat of precipitation condensation reduced to more than 120 W/m^2.In September,the latent heat of precipitation condensation in the plateau was higher than in May.The precipitation latent heat reached 120 W/m^2 range reduction in August.The latent heat of precipitation in the rainy season showed an upward trend in the northwest of the plateau(except the Lnghu region).The southeast of Tibet,southeast of Qinghai,and northwest of Sichuan showed a downward trend.The distribution of spatial variation in the summer is the same as the rainy season,but the trend of change is more obvious.(7)Plateau summer atmospheric heat is higher than the rainy season.It was highest in August and lowest in September of atmospheric heat source.The spatial distribution large-value centers are concentrated on the southern edge of the Qinghai-Tibet Plateau and on the northwestern margin.(8)In the rainy season and summer,the latent heat to atmospheric heat source percentage has a decreasing trend,which was 1.4%/10 a,2%/10 a,respectively.Summer is higher than the rainy season.Mutation began after 1989.The proportion of the rainy season and summer season has a 4a period oscillation.The monthly proportion is highest in July and lowest in May.(9)The latent heat to atmospheric heat source percentage more than 100%in Qinghai,west of Sichuan,and northeast of Yunnan in the rainy season.Summer in Tibet,Northeast of Yunnan,and West of Plateau the proportion is increase.The heat source is higher than the precipitation condensation latent heat in Anduo,from 1987 to 1987 and from 1992 to 2006,the latent heat of precipitation contributed to the heat source is less.Lenghu latent heat of precipitation and atmospheric heat sources are all lower.(10)600~400h Pahigh-level atmospheric heat source is more sensitive to the latent heat of precipitation condensation in the rainy season,summer and September,500~400h Pa high-level is more sensitive in May,500~400h Pa high-level is more sensitive in June,In July and August,the 600-300 h Pa high-level atmospheric heat source is more sensitive.It mainly related to the changes of in the height of clouds,type of clouds,number of clouds,etc.