降水

Both the departure field of the mean atmospheric circula tion in summer in flood years and the correlation field between the summer mean atmospheric circulation in East Asia and the number of summer equivalent torre ntial rain days in the Beijing area possess the main characteristics of the mean circulation pattern for the torrential rain process in North China.

吴广仁等[2 ]根据降水距平场相似程度，给出了我国东部雨带的 4种分布型，并指出西太平洋副高位置对雨带分型有决定性作用，北京夏季降水正常或偏多时，是属于其中的黄淮东型和黄河河套型。

The development mechanisms of backflow precipitation are analyzed with the reasonable simulation results. The results show that dynamical frontogenesis plays a very important role in the development of backflow snowstorm. The frontogenetical secondary circulation directly causes the snowstorm.

在回流暴雪形成与发展的过程中，动力锋生机制发挥了重要作用；其产生的锋面次级环流是造成这次暴雪的主要原因；降水过程中，雨雪相态的转变与温度廊线有直接关系，随着降水由雨转为雪，雪水混合比增大迅速且其高度有所降低。

The washout of precipitation is effective, 64% of total sulfate is scavenged by precipitation, in which 57% by graupel, it shows the importance of ice phase process in acid deposition.

降水对气溶胶的冲刷十分有效，占初始气溶胶总量的64％，其中固态降水占57％，说明了冰相过程在硫沉降中的重要性。

The evolution of reflectivity in the Doppler images was coincided with the mode of the classic heavy precipitation supercell storm.And there was an obvious structure of heavy precipitation supercell storm in the vertical sectional drawing.Furthermore,there were also a mid-cyclone and a vertical wind shear in the process.At last,the factors related to the hailstone were analyzed.

新一代天气雷达图像上强度图的演变与强降水超级单体模式相吻合；剖面图上显示出强降水超级单体的明显结构；存在着中气旋和中等到强的垂直风切变；分析了此次过程中出现冰雹的相关因子。

The research result demonstrated that the non-linear feature of water confluence is affected by precipitation time period, additional to precipitation intensity which is known by hydrologist.

结果显示，除了过去我们认识到的降水强度对于径流过程有着非线性作用以外，降水的时间对于径流过程也有十分明显的驱动作用。

A fuzzy logic system for classification of hydrometeor type based on polarimetric radar measurements is described.

根据不同相态降水粒子的散射和空间取向等特征建立了基本形式为不对称的T型函数的模糊逻辑识别的隶属函数，完善了该识别方法的流程，并利用美国KOUN雷达的观测资料，详细讨论了利用双线偏振雷达观测资料识别降水粒子相态的方法，并对其在实际业务运用中的合理性和可行性进行分析探讨。

The results show that the constructed hydrometeor classification is reasonable since it can deduce the structure of hydrometeorsbut still need further data to research,and the effect of Z_DRis higher...

通过分析认为：利用该识别模式得到的结果基本合理，可以反映降水区域内降水粒子的相态结构，但还需要对资料作进一步的研究。

Since the convective cloud system is tilted, and the viewing angle is oblique, the area displacement between ice hydrometeor and the surface rainfall rate makes the relation between Tb and surface rainfall rate is relatively small.

但亮温和地面降水强度之间的相关性较弱，这是由于该对流系统为倾斜的，冰相粒子和地面降水强度之间存在着位置上的不一致，并且观测角为倾斜的。

Effect of impoundment of Three Gorses reservoir on the precipitation in Yangtze basin is summarized,and research method and main results are presented.

通过对以往专题研究成果的介绍，概述兴建三峡水库对长江流域降水的影响，介绍研究方法及主要研究成果，并利用已有的部分研究成果分析计算了三峡建库后流城年降水的增量。

The monthly reanalysis data set and the anal yzed precipitation data set are used to study the interannual variabili ty of Somali Jet and its influences on the interhemispheric water vapor t ransport and on the East Asian summer climate. It is indicated that SMJ plays a key role in the water vapor transport between the two hemispheres.

利用美国国家环境预报中心和美国国家大气科学研究中心再分析月平均气候资料以及Xie和Arkin分析的月平均降水资料（1968～199 8年），针对索马里低空急流的年际变化及其对东亚夏季降水的影响问题展开了分析研究。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。