特殊大地形背景下塔里木盆地夏季降水过程及其大气水分循环结构  

Summertime Precipitation Process and Atmospheric Water Cycle overTarim Basin Under the Specific Large Terrain Background

作　　者：徐祥德[1] 王寅钧[1,2] 魏文寿[3] 赵天良[2] 徐洪雄[1] 

机构地区：[1]中国气象科学研究院灾害天气国家重点实验室,北京100081 [2]南京信息工程大学,江苏南京210044 [3]中国气象局乌鲁木齐沙漠气象研究所,新疆乌鲁木齐830002

出　　处：《沙漠与绿洲气象》2014年第2期1-11,共11页Desert and Oasis Meteorology

基　　金：自然科学基金重点项目(41130960);财政部公益性行业(气象)科研专项第三次青藏高原科学试验--边界层与对流层观测(GYHY201406001);中国工程院咨询项目气候变化对三江源与青海湖水资源影响评估;未来趋势估测与应对;工程院咨询项目:我国旱涝事件集合应对战略研究

摘　　要：对塔里木盆地夏季降水过程和复杂的大气水分循环结构进行了分析,采用常规气象观测、探空及其不同网格NCEP等再分析数据,通过塔里木盆地视热源、水汽汇、涡度、散度三维动力结构以及相关小波周期分析、水汽输送通道相关矢量场及其Fluxpart轨迹模型等各类方法,综合剖析该区域大气热源与夏季降水过程及其水分循环结构特征。计算分析结果表明塔里木盆地沙漠边界层辐射强日变化叠加上周边C型大地形"山谷风"效应,导致高山环抱盆地及沙漠区的独特水、热过程与局地环流特征。Surrounded with the Tibetan Plateau and Tianshan Mountains, the Taklimakan desert, known as the ＆quot;sea of death＆quot;, is located in the Tarim basin, one of the largest inland basins in China. In the Taklimakan desert, precipitation plays a critical role in formation, maintenance and recovery of ecosystems. Under the impact of westerlies and monsoon, there is a unique water cycle over the Tarim Basin of arid region in northwest China. By using the data of surface and sounding observations and NCEP-reanalysis data, this paper comprehensively analyzed the processes of summertime precipitation and water cycle over the Tarim Basin with apparent heat source and moisture sink, vorticity, divergence, wavelet cycle, correlation vector of vapor transport flux and Fluxpart trajectory model. The analysis found that the integrated influences of distinct diurnal variation of surface radiation in the Taklimakan desert and forcing of＆quot;mountain valley breeze＆quot; built by the large terrain background in the surroundings of Tarim Basin lead to the unique water and heat cycles and diurnal change of local circulation in the atmosphere over the desert basin.

关 键 词：塔里木盆地 视热源 水汽汇 降水特征 

分 类 号：P434[天文地球—大气科学及气象学]