黄河源区重力波势能值计算及其与降水量关系的分析

本文基于1960—2016年的降水量数据分析了黄河源区降水量的分布特征，并利用COSMIC掩星数据计算得到2008年黄河源区的重力波势能值（Potential Energy，Ep），分析其变化特征，进而运用小波相干分析法探究黄河源区重力波势能值与降水量的相关性。结果表明：1） 黄河源区多年平均降水量受海拔高度影响显著。2） 对不同月份每一不同高程下的Ep值进行分析，得到2008年黄河源区重力波势能值随海拔高程及季节的变化趋势。3） 在2008年黄河源区呈现出：冬夏两季降水量存在较大差异，而重力波势能值同样存在明显的季节性差异，且与逐月平均降水量具有负相关的趋势。此现象是由于山坡地形的动力抬升作用影响和重力波对湿润气流的拖曳作用影响在不同时段占优。4） 黄河源区重力波和降水有着显著相关性，降水对于重力波有着很好的响应。

Calculation of potential energy of gravity wave in the source region of the Yellow River and analysis of its relationship with precipitation

Based on the precipitation data from 1960 to 2016, this paper analyzes the distribution characteristics of precipitation in the source area of the Yellow River, and calculates the potential energy (EP) of gravity wave in the source area of the Yellow River in 2008 by using cosmic occultation data, analyzes its variation characteristics, and then uses the wavelet coherence analysis method to explore the correlation between the potential energy of gravity wave and precipitation in the source area of the Yellow River. The results show that: 1) the precipitation in the source region of the Yellow River is significantly affected by altitude. 2) By analyzing the EP value of each elevation in different months, the variation trend of the potential energy value of gravity wave with elevation and season in the source area of the Yellow River in 2008 is obtained. 3) In 2008, the source region of the Yellow River showed a large difference in precipitation in winter and summer, while the potential energy value of gravity wave also had a significant seasonal difference, and had a negative correlation with the monthly average precipitation. This phenomenon is due to the influence of the dynamic uplift of the hillside terrain and the drag effect of the gravity wave on the moist air flow. 4) There is a significant correlation between gravity wave and precipitation in the source area of the Yellow River, and precipitation has a good response to gravity wave.