That is to say , the so - called drought trend in the east of nwc , is not only point to the evolution of precipitation on the ground in the long term , but also to the vapor content in the whole troposphere 这是上世纪九十年代中后期天水重大干旱事件发生的一个背景条件。这说明，所谓西北地区东部干旱化的趋势，不仅表现在地面降水量的长期演变方面，而且表现在对流层整层水汽含量方面。
To improve the precision of using gps remote sensing atmosphere precipitable water vapor , some scholars propose to set up a local model by taking advantage of local meteorologic data in the air , so as to improve the result of using universal model 摘要为进一步提高利用gps遥感大气综合水汽含量的精度，部分学者提出了利用当地探空气象资料建立局部区域模型，以改善采用通用模型计算综合水汽含量结果的观点。
Research on retrieval of gps water vapor and method of rainfall forecast are keen field which draws all attention from wide world . the dissertation is accomplished on the basis of sino - italy collaborative project - ' the integral system of flood risk programming , monitoring and real time forecasting " and the primary achievements and conclusion reached include : ( 1 ) a reasonable design has been made for gps water vapor monitoring network according to the theory of gps satellite signal propagation and vertical distribution of water vapor and local synoptic characteristic of binjiang basin , the effective area where water vapor can be detected by gps station has been determined under different cut - off angles . the conclusion has been reached that 3 ~ 4 gps receivers are enough for water vapor monitoring in binjiang basin Gps水汽反演和降雨预报研究是当前气象遥感应用的一个前沿探索领域，本论文依托于中意科技合作项目“洪水风险规划、监测和实时预报的集成系统” ，主要成果体现在以下方面： ( 1 )提出了一个合理的gps水汽监测网设计方案根据gps卫星信号传播原理和水汽垂直分布规律以及流域天气的地方性特征，确定了不同高度截角下一个gps站所能测定大气水汽含量的有效范围，得出了滨江流域只需要3 4个gps接收机就足以反映流域水汽变化的结论。
Most scientists agree that the overall effect of the direct andindirect feedbacks caused by increased water vapor content of theatmosphere significantly enhances the initial warming that caused theincrease - that is , it is a strong positive feedback . ( [ 2 ] , see b7 ) 作为一种间接机制，水汽可以被认为处于温室效应的正反馈环节中，即二氧化碳等人类排放的温室气体增加》导致地球平均温度升高》加速水气蒸发和增加空气中水汽含量》温度继续升高= 》重复前面循环。 。 。
The water vapor content , in all , is relatively less over the gobi and hungriness and more over the oasis ; there is " the clothesline effect " which influences the stabilization and development of the oasis at the margin of the oasis or the long and narrow protection forest through the deserts or in the neighborhood of the river and the aqueduct 戈壁沙漠上空水汽含量相对较少，绿洲上空水汽含量相对较大；绿洲边缘或通过沙漠的窄长护林带、河流以及水渠附近，存在着影响绿洲稳定和发展的“晒衣绳效应” 。
