摘要
以西安地区地基GPS站点观测资料为基础,结合地面自动气象站数据反演GPS大气可降水量(Pwv),在将其与探空水汽含量进行精度对比的基础上,分析GPS/Pwv在不同类型降水过程中的演变特征及预报指示意义。结果表明:GPS/Pwv与探空水汽含量随时间演变趋势一致,其相关系数达0.93;冬春季GPS/Pwv变化平缓,在降水之前有较长的增长期,预报指示意义强;夏季降水中则变化剧烈,降水之前无需长时间的水汽积累,预报指示意义弱。
GPS - retrieved atmospheric precipitable water vapor named GPS/Pwv is obtained on the basis of the combination of observa- tions from ground - based GPS sites and data from ground automatic weather stations in Xi＇ an of Shaanxi Province, and then it is com- pared with the radiosonde observations for the consideration of accuracy. Furthermore, the evolution characteristics and forecasting indi- cation significance of GPS/Pwv are analyzed in precipitation processes with different rainfall types. The results show that the evolution trends of GPS/Pwv and radiosonde observations are basically the same, and the correlation coefficient is approximately 0. 93. The GPS/Pwv changed gently in winter and spring and increased in a long period before precipitation, which could be strongly used for fore- casting indication. However, the situation was just opposite in summer, the forecast indication was relatively weak.
出处
《干旱气象》
2013年第2期278-282,289,共6页
Journal of Arid Meteorology
基金
陕西省气象局预报员专项项目(2013Y-18)
陕西省气象局"火车头计划"数值模式应用研究团队共同资助
