【摘要】 应用GPS探测的大气可降水量(PWV)对2010年大连地区降水过程中的水汽变化特征进行分析。结果表明:GPS/PWV资料能反映大气中水汽的时间和空间变化,其变化特征与降水有较好的对应关系;不同性质的降水过程PWV变化特征明显不同,稳定性降水过程PWV变化较为平缓,呈明显的单峰结构,对流性降水过程水汽变化程度剧烈,呈震荡趋势,而混合型降水具有两种性质降水的共同特征;降水过程中的GPS/PWV阈值表明,GPS/PWV资料在降水天气预报方面有一定的应用价值。更多还原

【Abstract】 Based on the perceptible water vapor(PWV) data from the ground based GPS,the water vapor characteristics of precipitation w eather processes in Dalian in 2010 w ere analyzed.The results show that the PWV data could reflect the temporal and spatial variation of w ater vapor and its variation characteristics has a significant corresponding relationship w ith precipitation.If the precipitation process differs,the PWV characteristics are also distinctly different.The PWV variation is gentle for a stable precipitation type and it has a single peak value;w ater vapor changes violently for a convective precipitation type and it is in a fluctuating trend;it is of the common characteristics of the above tw o precipitation types for a mixed precipitation type.The thresholds of the PWV related to rain are also given in the text,w hich indicates that the PWV data are useful to forecast precipitation to some extent.更多还原