干旱气象

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西安不同季节降水过程中大气可降水量变化特征

杨晓春王建鹏白庆梅惠 英解 斌   

  • 收稿日期:2012-12-12 出版日期:2013-07-10 发布日期:2013-03-07
  • 作者简介:杨晓春(1984 - ),女,汉族,陕西安塞人,硕士,工程师,从事GPS 气象及数值模拟研究. E - mail:y_xiaochun@ sina. com
  • 基金资助:

    陕西省气象局预报员专项项目(2013Y -18)和陕西省气象局“火车头计划”数值模式应用研究团队共同资助

Characteristic Analysis of GPS /Pwv Changes During Seasonal Precipitation Processes in Xi’an of Shaanxi Province

YANG Xiaochun,WANG Jianpeng,BAI Qingmei,HUI Ying,XIE Bin   

  1. Xi’an Meteorological Bureau of Shaanxi Province,Xi’an 710016,China
  • Received:2012-12-12 Online:2013-07-10 Published:2013-03-07

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。

关键词: GPS/ Pwv, 精度检验, 演变特征

Abstract:

GPS - retrieved atmospheric precipitable water vapor named GPS /Pwv is obtained on the basis of the combination of observations from ground - based GPS sites and data from ground automatic weather stations in Xi’an of Shaanxi Province,and then it is compared with the radiosonde observations for the consideration of accuracy. Furthermore,the evolution characteristics and forecasting indication 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 forecasting indication. However,the situation was just opposite in summer,the forecast indication was relatively weak.

Key words: GPS /Pwv, accuracy test, evolution characteristics

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